Fix test

* Fix warning C4530

* Rename FMT_EXCEPTIONS to FMT_USE_EXCEPTIONS

.clang-format

@@ -1,108 +1,19 @@
 ---
 Language:        Cpp
-# BasedOnStyle:  LLVM
+BasedOnStyle:  Google
 AccessModifierOffset: -4
-AlignAfterOpenBracket: DontAlign
-AlignConsecutiveAssignments: false
-AlignConsecutiveDeclarations: false
-AlignEscapedNewlines: Right
-AlignOperands:   true
-AlignTrailingComments: true
-AllowAllParametersOfDeclarationOnNextLine: true
-AllowShortBlocksOnASingleLine: true
-AllowShortCaseLabelsOnASingleLine: false
-AllowShortFunctionsOnASingleLine: Empty
-AllowShortIfStatementsOnASingleLine: false
-AllowShortLoopsOnASingleLine: false
-AlwaysBreakAfterDefinitionReturnType: None
-AlwaysBreakAfterReturnType: None
-AlwaysBreakBeforeMultilineStrings: false
-AlwaysBreakTemplateDeclarations: true
-BinPackArguments: true
-BinPackParameters: true
-BraceWrapping:     
-  AfterClass:      true
-  AfterControlStatement: true
-  AfterEnum:       true
-  AfterFunction:   true
-  AfterNamespace:  false
-  AfterObjCDeclaration: true
-  AfterStruct:     true
-  AfterUnion:      true
-  BeforeCatch:     true
-  BeforeElse:      true
-  IndentBraces:    false
-  SplitEmptyFunction: true
-  SplitEmptyRecord: true
-  SplitEmptyNamespace: true
-BreakBeforeBinaryOperators: None
-BreakBeforeBraces: Custom
-BreakBeforeInheritanceComma: false
-BreakBeforeTernaryOperators: true
-BreakConstructorInitializersBeforeComma: true
-BreakConstructorInitializers: BeforeColon
-BreakAfterJavaFieldAnnotations: false
-BreakStringLiterals: true
-ColumnLimit:     140
-CommentPragmas:  '^ IWYU pragma:'
-CompactNamespaces:  false
-ConstructorInitializerAllOnOneLineOrOnePerLine: false
-ConstructorInitializerIndentWidth: 4
-ContinuationIndentWidth: 4
-Cpp11BracedListStyle: true
-DerivePointerAlignment: false
-DisableFormat:   false
-ExperimentalAutoDetectBinPacking: false
-FixNamespaceComments: true
-ForEachMacros:   
-  - foreach
-  - Q_FOREACH
-  - BOOST_FOREACH
-IncludeCategories: 
-  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
-    Priority:        2
-  - Regex:           '^(<|"(gtest|gmock|isl|json)/)'
-    Priority:        3
-  - Regex:           '.*'
-    Priority:        1
-IncludeIsMainRegex: '(Test)?$'
-IndentCaseLabels: false
+Standard:        c++17
 IndentWidth:     4
-IndentWrappedFunctionNames: false
-JavaScriptQuotes: Leave
-JavaScriptWrapImports: true
-KeepEmptyLinesAtTheStartOfBlocks: true
-MacroBlockBegin: ''
-MacroBlockEnd:   ''
-MaxEmptyLinesToKeep: 1
-NamespaceIndentation: None
-ObjCBlockIndentWidth: 2
-ObjCSpaceAfterProperty: false
-ObjCSpaceBeforeProtocolList: true
-PenaltyBreakAssignment: 2
-PenaltyBreakBeforeFirstCallParameter: 19
-PenaltyBreakComment: 300
-PenaltyBreakFirstLessLess: 120
-PenaltyBreakString: 1000
-PenaltyExcessCharacter: 1000000
-PenaltyReturnTypeOnItsOwnLine: 60
-PointerAlignment: Right
-ReflowComments:  true
-SortIncludes:    true
-SortUsingDeclarations: true
-SpaceAfterCStyleCast: false
-SpaceAfterTemplateKeyword: false
-SpaceBeforeAssignmentOperators: true
-SpaceBeforeParens: ControlStatements
-SpaceInEmptyParentheses: false
-SpacesBeforeTrailingComments: 1
-SpacesInAngles:  false
-SpacesInContainerLiterals: true
-SpacesInCStyleCastParentheses: false
-SpacesInParentheses: false
-SpacesInSquareBrackets: false
-Standard:        Cpp11
-TabWidth:        8
+TabWidth:        4
 UseTab:          Never
+ColumnLimit:     100
+AlignAfterOpenBracket: Align
+BinPackParameters: false
+AlignEscapedNewlines: Left
+AlwaysBreakTemplateDeclarations: Yes
+PackConstructorInitializers: Never
+BreakConstructorInitializersBeforeComma: false
+IndentPPDirectives: BeforeHash
+SortIncludes:    Never
 ...
 

.clang-tidy

@@ -1,7 +1,32 @@
-Checks: 'modernize-*,modernize-use-override,google-*,-google-runtime-references,misc-*,clang-analyzer-*'
+Checks: 'cppcoreguidelines-*,
+performance-*,
+modernize-*,
+google-*,
+misc-*
+cert-*,
+readability-*,
+clang-analyzer-*,
+-performance-unnecessary-value-param,
+-modernize-use-trailing-return-type,
+-google-runtime-references,
+-misc-non-private-member-variables-in-classes,
+-readability-braces-around-statements,
+-google-readability-braces-around-statements,
+-cppcoreguidelines-avoid-magic-numbers,
+-readability-magic-numbers,
+-readability-magic-numbers,
+-cppcoreguidelines-pro-type-vararg,
+-cppcoreguidelines-pro-bounds-pointer-arithmetic,
+-cppcoreguidelines-avoid-c-arrays,
+-modernize-avoid-c-arrays,
+-cppcoreguidelines-pro-bounds-array-to-pointer-decay,
+-readability-named-parameter,
+-cert-env33-c
+'
+
+
 WarningsAsErrors: ''
-HeaderFilterRegex: 'async.h|async_logger.h|common.h|details|formatter.h|logger.h|sinks|spdlog.h|tweakme.h|version.h'
-AnalyzeTemporaryDtors: false
+HeaderFilterRegex: '*spdlog/[^f].*'
 FormatStyle:     none
 
 CheckOptions:    

.git-blame-ignore-revs

@@ -0,0 +1,6 @@
+# clang-format
+1a0bfc7a89f2d58e22605a4dc7e18a9a555b65aa
+95c226e9c92928e20ccdac0d060e7241859e282b
+9d52261185b5f2c454c381d626ec5c84d7b195f4
+4b2a8219d5d1b40062d030441adde7d1fb0d4f84
+0a53eafe18d983c7c8ba4cadd02d0cc7f7308f28

.gitattributes

@@ -0,0 +1 @@
+* text=false

.github/workflows/linux.yml

@@ -0,0 +1,87 @@
+name: linux
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  # -----------------------------------------------------------------------
+  # Linux build matrix
+  # -----------------------------------------------------------------------
+  build:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - { compiler: gcc, version: 7, build_type: Release, cppstd: 11 }
+          - { compiler: gcc, version: 9, build_type: Release, cppstd: 17 }
+          - { compiler: gcc, version: 11, build_type: Debug, cppstd: 20 }
+          - { compiler: gcc, version: 12, build_type: Release, cppstd: 20 }
+          - { compiler: gcc, version: 12, build_type: Debug, cppstd: 20, asan: ON }
+          - { compiler: clang, version: 12, build_type: Debug, cppstd: 17 }
+          - { compiler: clang, version: 15, build_type: Release, cppstd: 20, tsan: ON }
+    container:
+      image: ${{ matrix.config.compiler == 'clang' && 'teeks99/clang-ubuntu' || matrix.config.compiler }}:${{ matrix.config.version }}
+    name: "${{ matrix.config.compiler}} ${{ matrix.config.version }} (C++${{ matrix.config.cppstd }} ${{ matrix.config.build_type }} ${{ matrix.config.asan == 'ON' && 'ASAN' || '' }}${{ matrix.config.tsan == 'ON' && 'TSAN' || '' }})"
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup
+        run: |
+          apt-get update
+          apt-get install -y curl git pkg-config libsystemd-dev
+          CMAKE_VERSION="3.24.2"
+          curl -sSL https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-x86_64.sh -o install-cmake.sh
+          chmod +x install-cmake.sh
+          ./install-cmake.sh --prefix=/usr/local --skip-license
+      - name: Setup Compiler
+        if: matrix.config.compiler == 'clang'
+        run: |
+          scripts/ci_setup_clang.sh "${{ matrix.config.version }}"
+          echo "CXXFLAGS=-stdlib=libc++" >> $GITHUB_ENV          
+          echo "CC=clang-${{ matrix.config.version }}" >> $GITHUB_ENV
+          echo "CXX=clang++-${{ matrix.config.version }}" >> $GITHUB_ENV
+      - name: Build
+        run: |
+          mkdir -p build && cd build
+          cmake .. \
+            -DCMAKE_BUILD_TYPE=${{ matrix.config.build_type }} \
+            -DCMAKE_CXX_STANDARD=${{ matrix.config.cppstd }} \
+            -DSPDLOG_BUILD_EXAMPLE=${{ matrix.config.examples || 'ON' }} \
+            -DSPDLOG_BUILD_EXAMPLE_HO=${{ matrix.config.examples || 'ON' }} \
+            -DSPDLOG_BUILD_WARNINGS=ON \
+            -DSPDLOG_BUILD_BENCH=OFF \
+            -DSPDLOG_BUILD_TESTS=ON \
+            -DSPDLOG_BUILD_TESTS_HO=OFF \
+            -DSPDLOG_SANITIZE_ADDRESS=${{ matrix.config.asan || 'OFF' }} \
+            -DSPDLOG_SANITIZE_THREAD=${{ matrix.config.tsan || 'OFF' }}
+          make -j 4
+          ctest -j 4 --output-on-failure
+
+  # -----------------------------------------------------------------------
+  # OS X build matrix
+  # -----------------------------------------------------------------------
+  build_osx:
+    runs-on: macOS-latest
+    name: "OS X Clang (C++11, Release)"
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build
+        run: |
+          mkdir -p build && cd build
+          cmake .. \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_CXX_STANDARD=11 \
+            -DSPDLOG_BUILD_EXAMPLE=ON \
+            -DSPDLOG_BUILD_EXAMPLE_HO=ON \
+            -DSPDLOG_BUILD_WARNINGS=ON \
+            -DSPDLOG_BUILD_BENCH=OFF \
+            -DSPDLOG_BUILD_TESTS=ON \
+            -DSPDLOG_BUILD_TESTS_HO=OFF \
+            -DSPDLOG_SANITIZE_ADDRESS=OFF
+          make -j 4
+          ctest -j 4 --output-on-failure

.github/workflows/macos.yml

@@ -0,0 +1,38 @@
+name: macos
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: macOS-latest
+    name: "macOS Clang (C++11, Release)"
+    strategy:
+      fail-fast: true
+      matrix:
+        config:
+            - USE_STD_FORMAT: 'ON'
+              BUILD_EXAMPLE: 'OFF'
+            - USE_STD_FORMAT: 'OFF'
+              BUILD_EXAMPLE: 'ON'
+              
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build
+        run: |
+          mkdir -p build && cd build
+          cmake .. \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_CXX_STANDARD=11 \
+            -DSPDLOG_BUILD_EXAMPLE=${{ matrix.config.BUILD_EXAMPLE }} \
+            -DSPDLOG_BUILD_EXAMPLE_HO=${{ matrix.config.BUILD_EXAMPLE }} \
+            -DSPDLOG_BUILD_WARNINGS=ON \
+            -DSPDLOG_BUILD_BENCH=OFF \
+            -DSPDLOG_BUILD_TESTS=ON \
+            -DSPDLOG_BUILD_TESTS_HO=OFF \
+            -DSPDLOG_USE_STD_FORMAT=${{ matrix.config.USE_STD_FORMAT }} \
+            -DSPDLOG_SANITIZE_ADDRESS=OFF
+          make -j 4
+          ctest -j 4 --output-on-failure

.github/workflows/windows.yml

@@ -0,0 +1,148 @@
+name: windows
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: windows-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        config:
+          - GENERATOR: "Visual Studio 17 2022"
+            BUILD_TYPE: Release
+            BUILD_SHARED: 'ON'
+            FATAL_ERRORS: 'ON'
+            WCHAR: 'OFF'
+            WCHAR_FILES: 'OFF'
+            BUILD_EXAMPLE: 'OFF'
+            USE_STD_FORMAT: 'ON'
+            CXX_STANDARD: 20
+          - GENERATOR: "Visual Studio 17 2022"
+            BUILD_TYPE: Release
+            BUILD_SHARED: 'ON'
+            FATAL_ERRORS: 'ON'
+            WCHAR: 'ON'
+            WCHAR_FILES: 'ON'
+            BUILD_EXAMPLE: 'OFF'
+            USE_STD_FORMAT: 'ON'
+            CXX_STANDARD: 20
+          - GENERATOR: "Visual Studio 17 2022"
+            BUILD_TYPE: Release
+            BUILD_SHARED: 'ON'
+            FATAL_ERRORS: 'ON'
+            WCHAR: 'OFF'
+            WCHAR_FILES: 'OFF'
+            BUILD_EXAMPLE: 'ON'
+            USE_STD_FORMAT: 'OFF'
+            CXX_STANDARD: 17
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: CMake ${{ matrix.config.GENERATOR }} CXX=${{matrix.config.CXX_STANDARD}} WCHAR=${{matrix.config.WCHAR_FILES}} STD_FORMAT=${{matrix.config.USE_STD_FORMAT}}
+        shell: pwsh
+        run: |
+          mkdir build
+          cd build
+          cmake -G "${{ matrix.config.GENERATOR }}"  -A x64 `
+            -D CMAKE_BUILD_TYPE=${{ matrix.config.BUILD_TYPE }} `
+            -D BUILD_SHARED_LIBS=${{ matrix.config.BUILD_SHARED }} `
+            -D SPDLOG_WCHAR_SUPPORT=${{ matrix.config.WCHAR }} `
+            -D SPDLOG_WCHAR_FILENAMES=${{ matrix.config.WCHAR_FILES }} `
+            -D SPDLOG_BUILD_EXAMPLE=${{ matrix.config.BUILD_EXAMPLE }} `
+            -D SPDLOG_BUILD_EXAMPLE_HO=${{ matrix.config.BUILD_EXAMPLE }} `
+            -D SPDLOG_BUILD_TESTS=ON `
+            -D SPDLOG_BUILD_TESTS_HO=OFF `
+            -D SPDLOG_BUILD_WARNINGS=${{ matrix.config.FATAL_ERRORS }} `
+            -D SPDLOG_USE_STD_FORMAT=${{ matrix.config.USE_STD_FORMAT }} `
+            -D CMAKE_CXX_STANDARD=${{ matrix.config.CXX_STANDARD }} ..
+
+      - name: Build
+        shell: pwsh
+        run: |
+          cd build
+          cmake --build  . --parallel --config ${{ matrix.config.BUILD_TYPE }}
+
+      - name: Run Tests
+        shell: pwsh
+        env:
+          PATH: ${{ env.PATH }};${{ github.workspace }}\build\_deps\catch2-build\src\${{ matrix.config.BUILD_TYPE }};${{ github.workspace }}\build\${{ matrix.config.BUILD_TYPE }}
+        run: |
+          build\tests\${{ matrix.config.BUILD_TYPE }}\spdlog-utests.exe
+
+  # -----------------------------------------------------------------------
+  # MSVC 2019 build matrix
+  # -----------------------------------------------------------------------
+  build_2019:
+    runs-on: windows-2019
+    strategy:
+      fail-fast: true
+      matrix:
+        config:
+          - GENERATOR: "Visual Studio 16 2019"
+            BUILD_TYPE: Release
+            BUILD_SHARED: 'ON'
+            FATAL_ERRORS: 'ON'
+            WCHAR: 'OFF'
+            WCHAR_FILES: 'OFF'
+            BUILD_EXAMPLE: 'ON'
+            USE_STD_FORMAT: 'OFF'
+            CXX_STANDARD: 17
+          - GENERATOR: "Visual Studio 16 2019"
+            BUILD_TYPE: Release
+            BUILD_SHARED: 'ON'
+            FATAL_ERRORS: 'ON'
+            WCHAR: 'OFF'
+            WCHAR_FILES: 'OFF'
+            BUILD_EXAMPLE: 'ON'
+            USE_STD_FORMAT: 'OFF'
+            CXX_STANDARD: 14
+          - GENERATOR: "Visual Studio 16 2019"
+            BUILD_TYPE: Release
+            BUILD_SHARED: 'ON'
+            FATAL_ERRORS: 'ON'
+            WCHAR: 'OFF'
+            WCHAR_FILES: 'OFF'
+            BUILD_EXAMPLE: 'ON'
+            USE_STD_FORMAT: 'OFF'
+            CXX_STANDARD: 11
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: CMake ${{ matrix.config.GENERATOR }} CXX=${{matrix.config.CXX_STANDARD}} WCHAR=${{matrix.config.WCHAR_FILES}} STD_FORMAT=${{matrix.config.USE_STD_FORMAT}}
+        shell: pwsh
+        run: |
+          mkdir build
+          cd build
+          cmake -G "${{ matrix.config.GENERATOR }}"  -A x64 `
+            -D CMAKE_BUILD_TYPE=${{ matrix.config.BUILD_TYPE }} `
+            -D BUILD_SHARED_LIBS=${{ matrix.config.BUILD_SHARED }} `
+            -D SPDLOG_WCHAR_SUPPORT=${{ matrix.config.WCHAR }} `
+            -D SPDLOG_WCHAR_FILENAMES=${{ matrix.config.WCHAR_FILES }} `
+            -D SPDLOG_BUILD_EXAMPLE=${{ matrix.config.BUILD_EXAMPLE }} `
+            -D SPDLOG_BUILD_EXAMPLE_HO=${{ matrix.config.BUILD_EXAMPLE }} `
+            -D SPDLOG_BUILD_TESTS=ON `
+            -D SPDLOG_BUILD_TESTS_HO=OFF `
+            -D SPDLOG_BUILD_WARNINGS=${{ matrix.config.FATAL_ERRORS }} `
+            -D SPDLOG_USE_STD_FORMAT=${{ matrix.config.USE_STD_FORMAT }} `
+            -D CMAKE_CXX_STANDARD=${{ matrix.config.CXX_STANDARD }} ..
+
+      - name: Build
+        shell: pwsh
+        run: |
+          cd build
+          cmake --build  . --parallel --config ${{ matrix.config.BUILD_TYPE }}
+
+      - name: Run Tests
+        shell: pwsh
+        env:
+          PATH: ${{ env.PATH }};${{ github.workspace }}\build\_deps\catch2-build\src\${{ matrix.config.BUILD_TYPE }};${{ github.workspace }}\build\${{ matrix.config.BUILD_TYPE }}
+        run: |
+          build\tests\${{ matrix.config.BUILD_TYPE }}\spdlog-utests.exe

.gitignore

@@ -1,5 +1,7 @@
 # Auto generated files
-build/*
+[Dd]ebug/
+[Rr]elease/
+build/*
 *.slo
 *.lo
 *.o
@@ -34,6 +36,9 @@ build/*
 # Codelite
 .codelite
 
+# KDevelop
+*.kdev4
+
 # .orig files
 *.orig
 
@@ -46,11 +51,13 @@ example/*
 !example/example.sln
 !example/example.vcxproj
 !example/CMakeLists.txt
+!example/meson.build
 !example/multisink.cpp
 !example/jni
 
 # generated files
 generated
+version.rc
 
 # Cmake
 CMakeCache.txt
@@ -63,6 +70,29 @@ install_manifest.txt
 /tests/tests.VC.db
 /tests/tests
 /tests/logs/*
+spdlogConfig.cmake
+spdlogConfigVersion.cmake
+compile_commands.json
 
 # idea
-.idea/
+.idea/
+.cache/
+.vscode/
+cmake-build-*/
+*.db
+*.ipch
+*.filters
+*.db-wal
+*.opendb
+*.db-shm
+*.vcxproj
+*.tcl
+*.user
+*.sln
+
+# macos
+*.DS_store
+*.xcodeproj/
+/.vs
+/out/build
+/CMakeSettings.json

.travis.yml

@@ -1,115 +0,0 @@
-# Adapted from various sources, including:
-# - Louis Dionne's Hana: https://github.com/ldionne/hana
-# - Paul Fultz II's FIT: https://github.com/pfultz2/Fit
-# - Eric Niebler's range-v3: https://github.com/ericniebler/range-v3
-sudo: required
-language: cpp
-
-addons: &gcc48
-  apt:
-    packages:
-      - g++-4.8
-    sources:
-      - ubuntu-toolchain-r-test
-
-addons: &gcc7
-  apt:
-    packages:
-      - g++-7
-    sources:
-      - ubuntu-toolchain-r-test
-
-addons: &clang35
-  apt:
-    packages:
-      - clang-3.5
-    sources:
-      - ubuntu-toolchain-r-test
-      - llvm-toolchain-precise-3.5
-
-addons: &clang6
-  apt:
-    packages:
-      - clang-6.0
-    sources:
-      - ubuntu-toolchain-r-test
-      - llvm-toolchain-trusty-6.0
-
-
-matrix:
-  include:
-    # Test gcc-4.8: C++11, Build=Debug/Release
-    - env: GCC_VERSION=4.8 BUILD_TYPE=Debug CPP=11
-      os: linux
-      addons: *gcc48
-
-    - env: GCC_VERSION=4.8 BUILD_TYPE=Release CPP=11
-      os: linux
-      addons: *gcc48
-  
-    - env: GCC_VERSION=7 BUILD_TYPE=Release CPP=11
-      os: linux
-      addons: *gcc7
-
-    # Test clang-3.5: C++11, Build=Debug/Release
-    - env: CLANG_VERSION=3.5 BUILD_TYPE=Debug CPP=11
-      os: linux
-      addons: *clang35
-
-    - env: CLANG_VERSION=3.5 BUILD_TYPE=Release CPP=11
-      os: linux
-      addons: *clang35
-
-      # Test clang-6.0: C++11, Build=Debug, ASAN=On
-    - env: CLANG_VERSION=6.0 BUILD_TYPE=Debug CPP=11 ASAN=On TSAN=Off
-      os: linux
-      addons: *clang6
-      
-    - env: CLANG_VERSION=6.0 BUILD_TYPE=Release CPP=11 ASAN=On TSAN=Off
-      os: linux
-      addons: *clang6
-      
-      # Test clang-6.0: C++11, Build=Debug, TSAN=On
-    - env: CLANG_VERSION=6.0 BUILD_TYPE=Debug CPP=11 ASAN=Off TSAN=On
-      os: linux
-      addons: *clang6
-      
-    - env: CLANG_VERSION=6.0 BUILD_TYPE=Release CPP=11 ASAN=Off TSAN=On
-      os: linux
-      addons: *clang6
-
-      # osx
-    - env: BUILD_TYPE=Release CPP=11 ASAN=Off TSAN=Off
-      os: osx
-    
-
-
-
-before_script:
-  - if [ -n "$GCC_VERSION" ]; then export CXX="g++-${GCC_VERSION}" CC="gcc-${GCC_VERSION}"; fi
-  - if [ -n "$CLANG_VERSION" ]; then export CXX="clang++-${CLANG_VERSION}" CC="clang-${CLANG_VERSION}"; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export CXX="clang++" CC="clang"; fi
-  - which $CXX
-  - which $CC
-  - $CXX --version
-  - cmake --version
-
-script:
-  - cd ${TRAVIS_BUILD_DIR}
-  - mkdir -p build && cd build
-  - |
-    cmake .. \
-      --warn-uninitialized \
-      -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
-      -DCMAKE_CXX_STANDARD=$CPP \
-      -DSPDLOG_BUILD_EXAMPLES=ON \
-      -DSPDLOG_BUILD_BENCH=OFF \
-      -DSPDLOG_SANITIZE_ADDRESS=$ASAN \
-      -DSPDLOG_SANITIZE_THREAD=$TSAN
-  - make VERBOSE=1 -j2
-  - ctest -j2 --output-on-failure
-
-
-
-notifications:
-  email: false

CMakeLists.txt

@@ -1,148 +1,404 @@
-#
-# Copyright(c) 2015 Ruslan Baratov.
-# Distributed under the MIT License (http://opensource.org/licenses/MIT)
-#
+# Copyright(c) 2019 spdlog authors Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+cmake_minimum_required(VERSION 3.10...3.21)
+
+# ---------------------------------------------------------------------------------------
+# Start spdlog project
+# ---------------------------------------------------------------------------------------
+include(cmake/utils.cmake)
+include(cmake/ide.cmake)
+
+spdlog_extract_version()
+
+project(spdlog VERSION ${SPDLOG_VERSION} LANGUAGES CXX)
+message(STATUS "Build spdlog: ${SPDLOG_VERSION}")
 
-cmake_minimum_required(VERSION 3.1)
-project(spdlog VERSION 1.2.0 LANGUAGES CXX)
-include(CTest)
-include(CMakeDependentOption)
 include(GNUInstallDirs)
 
-#---------------------------------------------------------------------------------------
-# set default build to release
-#---------------------------------------------------------------------------------------
-if(NOT CMAKE_BUILD_TYPE)
+# ---------------------------------------------------------------------------------------
+# Set default build to release
+# ---------------------------------------------------------------------------------------
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
     set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose Release or Debug" FORCE)
 endif()
 
-message(STATUS "Build type: " ${CMAKE_BUILD_TYPE})
+# ---------------------------------------------------------------------------------------
+# Compiler config
+# ---------------------------------------------------------------------------------------
+if(SPDLOG_USE_STD_FORMAT)
+    set(CMAKE_CXX_STANDARD 20)
+    set(CMAKE_CXX_STANDARD_REQUIRED ON)
+elseif(NOT CMAKE_CXX_STANDARD)
+    set(CMAKE_CXX_STANDARD 11)
+    set(CMAKE_CXX_STANDARD_REQUIRED ON)
+endif()
 
-#---------------------------------------------------------------------------------------
-# compiler config
-#---------------------------------------------------------------------------------------
-set(CMAKE_CXX_STANDARD 11)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-    add_compile_options("-Wall")
-    add_compile_options("-Wextra")
-    add_compile_options("-Wconversion")
-    add_compile_options("-pedantic")
-    add_compile_options("-Wfatal-errors")
-    
+if(CMAKE_SYSTEM_NAME MATCHES "CYGWIN" OR CMAKE_SYSTEM_NAME MATCHES "MSYS" OR CMAKE_SYSTEM_NAME MATCHES "MINGW")
+    set(CMAKE_CXX_EXTENSIONS ON)
 endif()
 
-#---------------------------------------------------------------------------------------
-# address sanitizers check
-#---------------------------------------------------------------------------------------
-include(cmake/sanitizers.cmake)
+# ---------------------------------------------------------------------------------------
+# Set SPDLOG_MASTER_PROJECT to ON if we are building spdlog
+# ---------------------------------------------------------------------------------------
+# Check if spdlog is being used directly or via add_subdirectory, but allow overriding
+if(NOT DEFINED SPDLOG_MASTER_PROJECT)
+    if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+        set(SPDLOG_MASTER_PROJECT ON)
+    else()
+        set(SPDLOG_MASTER_PROJECT OFF)
+    endif()
+endif()
+
+option(SPDLOG_BUILD_ALL "Build all artifacts" OFF)
+
+# build shared option
+option(SPDLOG_BUILD_SHARED "Build shared library" OFF)
+
+# precompiled headers option
+option(SPDLOG_ENABLE_PCH "Build static or shared library using precompiled header to speed up compilation time" OFF)
+
+# build position independent code
+option(SPDLOG_BUILD_PIC "Build position independent code (-fPIC)" OFF)
+
+# example options
+option(SPDLOG_BUILD_EXAMPLE "Build example" ${SPDLOG_MASTER_PROJECT})
+option(SPDLOG_BUILD_EXAMPLE_HO "Build header only example" OFF)
+
+# testing options
+option(SPDLOG_BUILD_TESTS "Build tests" OFF)
+option(SPDLOG_BUILD_TESTS_HO "Build tests using the header only version" OFF)
+
+# bench options
+option(SPDLOG_BUILD_BENCH "Build benchmarks (Requires https://github.com/google/benchmark.git to be installed)" OFF)
+
+# sanitizer options
+option(SPDLOG_SANITIZE_ADDRESS "Enable address sanitizer in tests" OFF)
+option(SPDLOG_SANITIZE_THREAD "Enable thread sanitizer in tests" OFF)
+if(SPDLOG_SANITIZE_ADDRESS AND SPDLOG_SANITIZE_THREAD)
+    message(FATAL_ERROR "SPDLOG_SANITIZE_ADDRESS and SPDLOG_SANITIZE_THREAD are mutually exclusive")
+endif()
+
+# warning options
+option(SPDLOG_BUILD_WARNINGS "Enable compiler warnings" OFF)
+
+# install options
+option(SPDLOG_SYSTEM_INCLUDES "Include as system headers (skip for clang-tidy)." OFF)
+option(SPDLOG_INSTALL "Generate the install target" ${SPDLOG_MASTER_PROJECT})
+option(SPDLOG_USE_STD_FORMAT "Use std::format instead of fmt library." OFF)
+option(SPDLOG_FMT_EXTERNAL "Use external fmt library instead of bundled" OFF)
+option(SPDLOG_FMT_EXTERNAL_HO "Use external fmt header-only library instead of bundled" OFF)
+option(SPDLOG_NO_EXCEPTIONS "Compile with -fno-exceptions. Call abort() on any spdlog exceptions" OFF)
+
+if(SPDLOG_FMT_EXTERNAL AND SPDLOG_FMT_EXTERNAL_HO)
+    message(FATAL_ERROR "SPDLOG_FMT_EXTERNAL and SPDLOG_FMT_EXTERNAL_HO are mutually exclusive")
+endif()
+
+if(SPDLOG_USE_STD_FORMAT AND SPDLOG_FMT_EXTERNAL_HO)
+    message(FATAL_ERROR "SPDLOG_USE_STD_FORMAT and SPDLOG_FMT_EXTERNAL_HO are mutually exclusive")
+endif()
+
+if(SPDLOG_USE_STD_FORMAT AND SPDLOG_FMT_EXTERNAL)
+    message(FATAL_ERROR "SPDLOG_USE_STD_FORMAT and SPDLOG_FMT_EXTERNAL are mutually exclusive")
+endif()
+
+# misc tweakme options
+if(WIN32)
+    option(SPDLOG_WCHAR_SUPPORT "Support wchar api" OFF)
+    option(SPDLOG_WCHAR_FILENAMES "Support wchar filenames" OFF)
+    option(SPDLOG_WCHAR_CONSOLE "Support wchar output to console" OFF)
+else()
+    set(SPDLOG_WCHAR_SUPPORT OFF CACHE BOOL "non supported option" FORCE)
+    set(SPDLOG_WCHAR_FILENAMES OFF CACHE BOOL "non supported option" FORCE)
+    set(SPDLOG_WCHAR_CONSOLE OFF CACHE BOOL "non supported option" FORCE)
+endif()
+
+if(MSVC)
+    option(SPDLOG_MSVC_UTF8 "Enable/disable msvc /utf-8 flag required by fmt lib" ON)
+endif()
+
+if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+    option(SPDLOG_CLOCK_COARSE "Use CLOCK_REALTIME_COARSE instead of the regular clock," OFF)
+else()
+    set(SPDLOG_CLOCK_COARSE OFF CACHE BOOL "non supported option" FORCE)
+endif()
+
+option(SPDLOG_PREVENT_CHILD_FD "Prevent from child processes to inherit log file descriptors" OFF)
+option(SPDLOG_NO_THREAD_ID "prevent spdlog from querying the thread id on each log call if thread id is not needed" OFF)
+option(SPDLOG_NO_TLS "prevent spdlog from using thread local storage" OFF)
+option(
+    SPDLOG_NO_ATOMIC_LEVELS
+    "prevent spdlog from using of std::atomic log levels (use only if your code never modifies log levels concurrently"
+    OFF)
+option(SPDLOG_DISABLE_DEFAULT_LOGGER "Disable default logger creation" OFF)
+option(SPDLOG_FWRITE_UNLOCKED "Use the unlocked variant of fwrite. Leave this on unless your libc doesn't have it" ON)
+
+# clang-tidy
+option(SPDLOG_TIDY "run clang-tidy" OFF)
+
+if(SPDLOG_TIDY)
+    set(CMAKE_CXX_CLANG_TIDY "clang-tidy")
+    set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+    message(STATUS "Enabled clang-tidy")
+endif()
+
+if(SPDLOG_BUILD_PIC)
+    set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+endif()
+
+find_package(Threads REQUIRED)
+message(STATUS "Build type: " ${CMAKE_BUILD_TYPE})
+# ---------------------------------------------------------------------------------------
+# Static/Shared library
+# ---------------------------------------------------------------------------------------
+set(SPDLOG_SRCS src/spdlog.cpp src/stdout_sinks.cpp src/color_sinks.cpp src/file_sinks.cpp src/async.cpp src/cfg.cpp)
+
+if(NOT SPDLOG_USE_STD_FORMAT AND NOT SPDLOG_FMT_EXTERNAL AND NOT SPDLOG_FMT_EXTERNAL_HO)
+    list(APPEND SPDLOG_SRCS src/bundled_fmtlib_format.cpp)
+endif()
+
+if(SPDLOG_BUILD_SHARED OR BUILD_SHARED_LIBS)
+    if(WIN32)
+        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/version.rc.in ${CMAKE_CURRENT_BINARY_DIR}/version.rc @ONLY)
+        list(APPEND SPDLOG_SRCS ${CMAKE_CURRENT_BINARY_DIR}/version.rc)
+    endif()
+    add_library(spdlog SHARED ${SPDLOG_SRCS} ${SPDLOG_ALL_HEADERS})
+    target_compile_definitions(spdlog PUBLIC SPDLOG_SHARED_LIB)
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+        target_compile_options(spdlog PUBLIC $<$<AND:$<CXX_COMPILER_ID:MSVC>,$<NOT:$<COMPILE_LANGUAGE:CUDA>>>:/wd4251
+                                             /wd4275>)
+    endif()
+    if(NOT SPDLOG_USE_STD_FORMAT AND NOT SPDLOG_FMT_EXTERNAL AND NOT SPDLOG_FMT_EXTERNAL_HO)
+        target_compile_definitions(spdlog PRIVATE FMT_LIB_EXPORT PUBLIC FMT_SHARED)
+    endif()
+else()
+    add_library(spdlog STATIC ${SPDLOG_SRCS} ${SPDLOG_ALL_HEADERS})
+endif()
 
-#---------------------------------------------------------------------------------------
-# spdlog target
-#---------------------------------------------------------------------------------------
-add_library(spdlog INTERFACE)
 add_library(spdlog::spdlog ALIAS spdlog)
 
-# Check if spdlog is being used directly or via add_subdirectory
-set(SPDLOG_MASTER_PROJECT OFF)
-if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
-  set(SPDLOG_MASTER_PROJECT ON)
+set(SPDLOG_INCLUDES_LEVEL "")
+if(SPDLOG_SYSTEM_INCLUDES)
+    set(SPDLOG_INCLUDES_LEVEL "SYSTEM")
 endif()
 
-option(SPDLOG_BUILD_EXAMPLES "Build examples" ${SPDLOG_MASTER_PROJECT})
-option(SPDLOG_BUILD_BENCH "Build benchmarks" ${SPDLOG_MASTER_PROJECT})
+target_compile_definitions(spdlog PUBLIC SPDLOG_COMPILED_LIB)
+target_include_directories(spdlog ${SPDLOG_INCLUDES_LEVEL} PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
+                                                                  "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
+target_link_libraries(spdlog PUBLIC Threads::Threads)
+spdlog_enable_warnings(spdlog)
 
-cmake_dependent_option(SPDLOG_BUILD_TESTING
-    "Build spdlog tests" ${SPDLOG_MASTER_PROJECT}
-    "BUILD_TESTING" OFF
-)
+set_target_properties(spdlog PROPERTIES VERSION ${SPDLOG_VERSION} SOVERSION
+                                                                  ${SPDLOG_VERSION_MAJOR}.${SPDLOG_VERSION_MINOR})
+set_target_properties(spdlog PROPERTIES DEBUG_POSTFIX d)
+
+if(COMMAND target_precompile_headers AND SPDLOG_ENABLE_PCH)
+    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/pch.h.in ${PROJECT_BINARY_DIR}/spdlog_pch.h @ONLY)
+    target_precompile_headers(spdlog PRIVATE ${PROJECT_BINARY_DIR}/spdlog_pch.h)
+endif()
+
+# sanitizer support
+if(SPDLOG_SANITIZE_ADDRESS)
+    spdlog_enable_addr_sanitizer(spdlog)
+elseif(SPDLOG_SANITIZE_THREAD)
+    spdlog_enable_thread_sanitizer(spdlog)
+endif()
+
+# ---------------------------------------------------------------------------------------
+# Header only version
+# ---------------------------------------------------------------------------------------
+add_library(spdlog_header_only INTERFACE)
+add_library(spdlog::spdlog_header_only ALIAS spdlog_header_only)
 
 target_include_directories(
-    spdlog
-    INTERFACE
-    "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
-    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
-)
+    spdlog_header_only ${SPDLOG_INCLUDES_LEVEL} INTERFACE "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
+                                                          "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
+target_link_libraries(spdlog_header_only INTERFACE Threads::Threads)
 
-set(HEADER_BASE "${CMAKE_CURRENT_SOURCE_DIR}/include")
+# ---------------------------------------------------------------------------------------
+# Use fmt package if using external fmt
+# ---------------------------------------------------------------------------------------
+if(SPDLOG_FMT_EXTERNAL OR SPDLOG_FMT_EXTERNAL_HO)
+    if(NOT TARGET fmt::fmt)
+        find_package(fmt CONFIG REQUIRED)
+    endif()
+    target_compile_definitions(spdlog PUBLIC SPDLOG_FMT_EXTERNAL)
+    target_compile_definitions(spdlog_header_only INTERFACE SPDLOG_FMT_EXTERNAL)
 
-if(SPDLOG_BUILD_EXAMPLES)
-    add_subdirectory(example)
+    # use external fmt-header-only
+    if(SPDLOG_FMT_EXTERNAL_HO)
+        target_link_libraries(spdlog PUBLIC fmt::fmt-header-only)
+        target_link_libraries(spdlog_header_only INTERFACE fmt::fmt-header-only)
+    else() # use external compile fmt
+        target_link_libraries(spdlog PUBLIC fmt::fmt)
+        target_link_libraries(spdlog_header_only INTERFACE fmt::fmt)
+    endif()
+
+    set(PKG_CONFIG_REQUIRES fmt) # add dependency to pkg-config
 endif()
 
-if(SPDLOG_BUILD_TESTING)
+# ---------------------------------------------------------------------------------------
+# Check if fwrite_unlocked/_fwrite_nolock is available
+# ---------------------------------------------------------------------------------------
+if(SPDLOG_FWRITE_UNLOCKED)
+    include(CheckSymbolExists)
+    if(WIN32)
+        check_symbol_exists(_fwrite_nolock "stdio.h" HAVE_FWRITE_UNLOCKED)
+    else()
+        check_symbol_exists(fwrite_unlocked "stdio.h" HAVE_FWRITE_UNLOCKED)
+    endif()
+    if(HAVE_FWRITE_UNLOCKED)
+        target_compile_definitions(spdlog PRIVATE SPDLOG_FWRITE_UNLOCKED)
+        target_compile_definitions(spdlog_header_only INTERFACE SPDLOG_FWRITE_UNLOCKED)
+    endif()
+endif()
+
+# ---------------------------------------------------------------------------------------
+# Add required libraries for Android CMake build
+# ---------------------------------------------------------------------------------------
+if(ANDROID)
+    target_link_libraries(spdlog PUBLIC log)
+    target_link_libraries(spdlog_header_only INTERFACE log)
+endif()
+
+# ---------------------------------------------------------------------------------------
+# Misc definitions according to tweak options
+# ---------------------------------------------------------------------------------------
+set(SPDLOG_WCHAR_TO_UTF8_SUPPORT ${SPDLOG_WCHAR_SUPPORT})
+set(SPDLOG_UTF8_TO_WCHAR_CONSOLE ${SPDLOG_WCHAR_CONSOLE})
+foreach(
+    SPDLOG_OPTION
+    SPDLOG_WCHAR_TO_UTF8_SUPPORT
+    SPDLOG_UTF8_TO_WCHAR_CONSOLE
+    SPDLOG_WCHAR_FILENAMES
+    SPDLOG_NO_EXCEPTIONS
+    SPDLOG_CLOCK_COARSE
+    SPDLOG_PREVENT_CHILD_FD
+    SPDLOG_NO_THREAD_ID
+    SPDLOG_NO_TLS
+    SPDLOG_NO_ATOMIC_LEVELS
+    SPDLOG_DISABLE_DEFAULT_LOGGER
+    SPDLOG_USE_STD_FORMAT)
+    if(${SPDLOG_OPTION})
+        target_compile_definitions(spdlog PUBLIC ${SPDLOG_OPTION})
+        target_compile_definitions(spdlog_header_only INTERFACE ${SPDLOG_OPTION})
+    endif()
+endforeach()
+
+if(MSVC)
+    target_compile_options(spdlog PRIVATE "/Zc:__cplusplus")
+    target_compile_options(spdlog_header_only INTERFACE "/Zc:__cplusplus")
+    if(SPDLOG_MSVC_UTF8)
+        # fmtlib requires the /utf-8 flag when building with msvc. see https://github.com/fmtlib/fmt/pull/4159 on the
+        # purpose of the additional
+        # "$<$<AND:$<COMPILE_LANGUAGE:CXX>,$<CXX_COMPILER_ID:MSVC>>"
+        target_compile_options(spdlog PUBLIC $<$<AND:$<COMPILE_LANGUAGE:CXX>,$<CXX_COMPILER_ID:MSVC>>:/utf-8>)
+        target_compile_options(spdlog_header_only
+                               INTERFACE $<$<AND:$<COMPILE_LANGUAGE:CXX>,$<CXX_COMPILER_ID:MSVC>>:/utf-8>)
+    endif()
+endif()
+
+# ---------------------------------------------------------------------------------------
+# If exceptions are disabled, disable them in the bundled fmt as well
+# ---------------------------------------------------------------------------------------
+if(SPDLOG_NO_EXCEPTIONS)
+    if(NOT SPDLOG_FMT_EXTERNAL AND NOT SPDLOG_FMT_EXTERNAL_HO)
+        target_compile_definitions(spdlog PUBLIC FMT_USE_EXCEPTIONS=0)
+    endif()
+    if(NOT MSVC)
+        target_compile_options(spdlog PRIVATE -fno-exceptions)
+    else()
+        target_compile_options(spdlog PRIVATE /EHs-c-)
+        target_compile_definitions(spdlog PRIVATE _HAS_EXCEPTIONS=0)
+    endif()
+endif()
+# ---------------------------------------------------------------------------------------
+# Build binaries
+# ---------------------------------------------------------------------------------------
+if(SPDLOG_BUILD_EXAMPLE OR SPDLOG_BUILD_EXAMPLE_HO OR SPDLOG_BUILD_ALL)
+    message(STATUS "Generating example(s)")
+    add_subdirectory(example)
+    spdlog_enable_warnings(example)
+    if(SPDLOG_BUILD_EXAMPLE_HO)
+        spdlog_enable_warnings(example_header_only)
+    endif()
+endif()
+
+if(SPDLOG_BUILD_TESTS OR SPDLOG_BUILD_TESTS_HO OR SPDLOG_BUILD_ALL)
+    message(STATUS "Generating tests")
+    enable_testing()
     add_subdirectory(tests)
 endif()
 
-if(SPDLOG_BUILD_BENCH)
+if(SPDLOG_BUILD_BENCH OR SPDLOG_BUILD_ALL)
+    message(STATUS "Generating benchmarks")
     add_subdirectory(bench)
 endif()
 
-#---------------------------------------------------------------------------------------
-# Install/export targets and files
-#---------------------------------------------------------------------------------------
-# set files and directories
-set(config_install_dir "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
-set(include_install_dir "${CMAKE_INSTALL_INCLUDEDIR}")
-set(pkgconfig_install_dir "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
-set(version_config "${CMAKE_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
-set(project_config "${PROJECT_NAME}Config.cmake")
-set(pkg_config "${CMAKE_BINARY_DIR}/${PROJECT_NAME}.pc")
-set(targets_export_name "${PROJECT_NAME}Targets")
-set(namespace "${PROJECT_NAME}::")
+# ---------------------------------------------------------------------------------------
+# Install
+# ---------------------------------------------------------------------------------------
+if(SPDLOG_INSTALL)
+    message(STATUS "Generating install")
+    set(project_config_in "${CMAKE_CURRENT_LIST_DIR}/cmake/spdlogConfig.cmake.in")
+    set(project_config_out "${CMAKE_CURRENT_BINARY_DIR}/spdlogConfig.cmake")
+    set(config_targets_file "spdlogConfigTargets.cmake")
+    set(version_config_file "${CMAKE_CURRENT_BINARY_DIR}/spdlogConfigVersion.cmake")
+    set(export_dest_dir "${CMAKE_INSTALL_LIBDIR}/cmake/spdlog")
+    set(pkgconfig_install_dir "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
+    set(pkg_config "${CMAKE_BINARY_DIR}/${PROJECT_NAME}.pc")
 
-# generate package version file
-include(CMakePackageConfigHelpers)
-write_basic_package_version_file(
-    "${version_config}" COMPATIBILITY SameMajorVersion
-)
+    # ---------------------------------------------------------------------------------------
+    # Include files
+    # ---------------------------------------------------------------------------------------
+    install(DIRECTORY include/ DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}" PATTERN "fmt/bundled" EXCLUDE)
+    install(
+        TARGETS spdlog spdlog_header_only
+        EXPORT spdlog
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 
-# configure pkg config file
-configure_file("cmake/spdlog.pc.in" "${pkg_config}" @ONLY)
+    if(NOT SPDLOG_USE_STD_FORMAT AND NOT SPDLOG_FMT_EXTERNAL AND NOT SPDLOG_FMT_EXTERNAL_HO)
+        install(DIRECTORY include/${PROJECT_NAME}/fmt/bundled/
+                DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}/fmt/bundled/")
+    endif()
 
-# install targets
-install(
-    TARGETS spdlog
-    EXPORT "${targets_export_name}"
-)
+    # ---------------------------------------------------------------------------------------
+    # Install pkg-config file
+    # ---------------------------------------------------------------------------------------
+    if(IS_ABSOLUTE "${CMAKE_INSTALL_INCLUDEDIR}")
+        set(PKG_CONFIG_INCLUDEDIR "${CMAKE_INSTALL_INCLUDEDIR}")
+    else()
+        set(PKG_CONFIG_INCLUDEDIR "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+    endif()
+    if(IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
+        set(PKG_CONFIG_LIBDIR "${CMAKE_INSTALL_LIBDIR}")
+    else()
+        set(PKG_CONFIG_LIBDIR "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
+    endif()
+    get_target_property(PKG_CONFIG_DEFINES spdlog INTERFACE_COMPILE_DEFINITIONS)
+    string(REPLACE ";" " -D" PKG_CONFIG_DEFINES "${PKG_CONFIG_DEFINES}")
+    string(CONCAT PKG_CONFIG_DEFINES "-D" "${PKG_CONFIG_DEFINES}")
+    configure_file("cmake/${PROJECT_NAME}.pc.in" "${pkg_config}" @ONLY)
+    install(FILES "${pkg_config}" DESTINATION "${pkgconfig_install_dir}")
 
-# install headers
-install(
-    DIRECTORY "${HEADER_BASE}/${PROJECT_NAME}"
-    DESTINATION "${include_install_dir}"
-)
+    # ---------------------------------------------------------------------------------------
+    # Install CMake config files
+    # ---------------------------------------------------------------------------------------
+    export(TARGETS spdlog spdlog_header_only NAMESPACE spdlog::
+           FILE "${CMAKE_CURRENT_BINARY_DIR}/${config_targets_file}")
+    install(EXPORT spdlog DESTINATION ${export_dest_dir} NAMESPACE spdlog:: FILE ${config_targets_file})
 
-# install project version file
-install(
-    FILES "${version_config}"
-    DESTINATION "${config_install_dir}"
-)
+    include(CMakePackageConfigHelpers)
+    configure_package_config_file("${project_config_in}" "${project_config_out}" INSTALL_DESTINATION ${export_dest_dir})
 
-# install pkg config file
-install(
-    FILES "${pkg_config}"
-    DESTINATION "${pkgconfig_install_dir}"
-)
+    write_basic_package_version_file("${version_config_file}" COMPATIBILITY SameMajorVersion)
+    install(FILES "${project_config_out}" "${version_config_file}" DESTINATION "${export_dest_dir}")
 
-# install project config file
-install(
-    EXPORT "${targets_export_name}"
-    NAMESPACE "${namespace}"
-    DESTINATION "${config_install_dir}"
-    FILE ${project_config}
-)
-
-# export build directory config file
-export(
-    EXPORT ${targets_export_name}
-    NAMESPACE "${namespace}"
-    FILE ${project_config}
-)
-
-# register project in CMake user registry
-export(PACKAGE ${PROJECT_NAME})
-
-file(GLOB_RECURSE spdlog_include_SRCS "${HEADER_BASE}/*.h")
-add_custom_target(spdlog_headers_for_ide SOURCES ${spdlog_include_SRCS})
+    # ---------------------------------------------------------------------------------------
+    # Support creation of installable packages
+    # ---------------------------------------------------------------------------------------
+    include(cmake/spdlogCPack.cmake)
+endif()

INSTALL

@@ -1,13 +1,27 @@
-spdlog is header only library.
-Just copy the files to your build tree and use a C++11 compiler
+Header Only Version
+==================================================================
+Just copy the files to your build tree and use a C++11 compiler.  
+Or use CMake:
+``` 
+  add_executable(example_header_only example.cpp)
+  target_link_libraries(example_header_only spdlog::spdlog_header_only)
+```
 
-Tested on:
+Compiled Library Version
+==================================================================
+CMake:
+```  
+  add_executable(example example.cpp)
+  target_link_libraries(example spdlog::spdlog)
+```
+
+Or copy files src/*.cpp to your build tree and pass the -DSPDLOG_COMPILED_LIB to the compiler.
+
+Important Information for Compilation:
+==================================================================
+* If you encounter compilation errors with gcc 4.8.x, please note that gcc 4.8.x does not fully support C++11. In such cases, consider upgrading your compiler or using a different version that fully supports C++11 standards
+
+Tested on:  
 gcc 4.8.1 and above
 clang 3.5
-Visual Studio 2013
-
-gcc 4.8 flags: --std==c++11 -pthread -O3 -flto -Wl,--no-as-needed
-gcc 4.9 flags: --std=c++11 -pthread -O3 -flto
-
-
-see the makefile in the example folder
+Visual Studio 2013

LICENSE

@@ -20,3 +20,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 
+-- NOTE: Third party dependency used by this software --
+This software depends on the fmt lib (MIT License),
+and users must comply to its license: https://raw.githubusercontent.com/fmtlib/fmt/master/LICENSE
+

README.md

@@ -1,120 +1,113 @@
 # spdlog
 
-Very fast, header only, C++ logging library. [![Build Status](https://travis-ci.org/gabime/spdlog.svg?branch=master)](https://travis-ci.org/gabime/spdlog)  [![Build status](https://ci.appveyor.com/api/projects/status/d2jnxclg20vd0o50?svg=true)](https://ci.appveyor.com/project/gabime/spdlog)
+ 
+[![ci](https://github.com/gabime/spdlog/actions/workflows/linux.yml/badge.svg)](https://github.com/gabime/spdlog/actions/workflows/linux.yml) 
+[![ci](https://github.com/gabime/spdlog/actions/workflows/windows.yml/badge.svg)](https://github.com/gabime/spdlog/actions/workflows/windows.yml) 
+[![ci](https://github.com/gabime/spdlog/actions/workflows/macos.yml/badge.svg)](https://github.com/gabime/spdlog/actions/workflows/macos.yml) 
+[![Build status](https://ci.appveyor.com/api/projects/status/d2jnxclg20vd0o50?svg=true&branch=v1.x)](https://ci.appveyor.com/project/gabime/spdlog) [![Release](https://img.shields.io/github/release/gabime/spdlog.svg)](https://github.com/gabime/spdlog/releases/latest)
 
+Fast C++ logging library
 
 
 ## Install
-#### Just copy the headers:
+#### Header-only version
+Copy the include [folder](include/spdlog) to your build tree and use a C++11 compiler.
 
-* Copy the source [folder](https://github.com/gabime/spdlog/tree/v1.x/include/spdlog) to your build tree and use a C++11 compiler.
-
-#### Or use your favorite package manager:
-
-* Ubuntu: `apt-get install libspdlog-dev`
-* Homebrew: `brew install spdlog`
-* FreeBSD:  `cd /usr/ports/devel/spdlog/ && make install clean`
-* Fedora: `yum install spdlog`
-* Gentoo: `emerge dev-libs/spdlog`
-* Arch Linux: `yaourt -S spdlog-git`
-* vcpkg: `vcpkg install spdlog`
- 
+#### Compiled version (recommended - much faster compile times)
+```console
+$ git clone https://github.com/gabime/spdlog.git
+$ cd spdlog && mkdir build && cd build
+$ cmake .. && cmake --build .
+```
+see example [CMakeLists.txt](example/CMakeLists.txt) on how to use.
 
 ## Platforms
- * Linux, FreeBSD, OpenBSD, Solaris, AIX
- * Windows (msvc 2013+, cygwin)
- * macOS (clang 3.5+)
- * Android
+* Linux, FreeBSD, OpenBSD, Solaris, AIX
+* Windows (msvc 2013+, cygwin)
+* macOS (clang 3.5+)
+* Android
+
+## Package managers:
+* Debian: `sudo apt install libspdlog-dev`
+* Homebrew: `brew install spdlog`
+* MacPorts: `sudo port install spdlog`
+* FreeBSD:  `pkg install spdlog`
+* Fedora: `dnf install spdlog`
+* Gentoo: `emerge dev-libs/spdlog`
+* Arch Linux: `pacman -S spdlog`
+* openSUSE: `sudo zypper in spdlog-devel`
+* ALT Linux: `apt-get install libspdlog-devel`
+* vcpkg: `vcpkg install spdlog`
+* conan: `conan install --requires=spdlog/[*]`
+* conda: `conda install -c conda-forge spdlog`
+* build2: ```depends: spdlog ^1.8.2```
+
 
 ## Features
 * Very fast (see [benchmarks](#benchmarks) below).
-* Headers only, just copy and use.
-* Feature rich formatting, using the excellent [fmt](https://github.com/fmtlib/fmt) library.
-* Fast asynchronous mode (optional)
-* [Custom](https://github.com/gabime/spdlog/wiki/3.-Custom-formatting) formatting.
+* Headers only or compiled
+* Feature-rich formatting, using the excellent [fmt](https://github.com/fmtlib/fmt) library.
+* Asynchronous mode (optional)
+* [Custom](https://github.com/gabime/spdlog/wiki/Custom-formatting) formatting.
 * Multi/Single threaded loggers.
 * Various log targets:
-    * Rotating log files.
-    * Daily log files.
-    * Console logging (colors supported).
-    * syslog.
-    * Windows debugger (```OutputDebugString(..)```)
-    * Easily extendable with custom log targets  (just implement a single function in the [sink](include/spdlog/sinks/sink.h) interface).
-* Severity based filtering - threshold levels can be modified in runtime as well as in compile time.
-* Binary data logging.
-
-
-## Benchmarks
-
-Below are some [benchmarks](https://github.com/gabime/spdlog/blob/v1.x/bench/bench.cpp) done in Ubuntu 64 bit, Intel i7-4770 CPU @ 3.40GHz
-
-#### Synchronous mode
-```
-*******************************************************************************
-Single thread, 1,000,000 iterations
-*******************************************************************************
-basic_st...             Elapsed: 0.181652       5,505,042/sec
-rotating_st...          Elapsed: 0.181781       5,501,117/sec
-daily_st...             Elapsed: 0.187595       5,330,630/sec
-null_st...              Elapsed: 0.0504704      19,813,602/sec
-*******************************************************************************
-10 threads sharing same logger, 1,000,000 iterations
-*******************************************************************************
-basic_mt...             Elapsed: 0.616035       1,623,284/sec
-rotating_mt...          Elapsed: 0.620344       1,612,008/sec
-daily_mt...             Elapsed: 0.648353       1,542,369/sec
-null_mt...              Elapsed: 0.151972       6,580,166/sec
-``` 
-#### Asynchronous mode
-```
-*******************************************************************************
-10 threads sharing same logger, 1,000,000 iterations 
-*******************************************************************************
-async...                Elapsed: 0.350066       2,856,606/sec
-async...                Elapsed: 0.314865       3,175,960/sec
-async...                Elapsed: 0.349851       2,858,358/sec
-```
+  * Rotating log files.
+  * Daily log files.
+  * Console logging (colors supported).
+  * syslog.
+  * Windows event log.
+  * Windows debugger (```OutputDebugString(..)```).
+  * Log to Qt widgets ([example](#log-to-qt-with-nice-colors)).
+  * Easily [extendable](https://github.com/gabime/spdlog/wiki/Sinks#implementing-your-own-sink) with custom log targets.
+* Log filtering - log levels can be modified at runtime as well as compile time.
+* Support for loading log levels from argv or environment var.
+* [Backtrace](#backtrace-support) support - store debug messages in a ring buffer and display them later on demand.
 
 ## Usage samples
 
+#### Basic usage
+```c++
+#include "spdlog/spdlog.h"
+
+int main() 
+{
+    spdlog::info("Welcome to spdlog!");
+    spdlog::error("Some error message with arg: {}", 1);
+    
+    spdlog::warn("Easy padding in numbers like {:08d}", 12);
+    spdlog::critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42);
+    spdlog::info("Support for floats {:03.2f}", 1.23456);
+    spdlog::info("Positional args are {1} {0}..", "too", "supported");
+    spdlog::info("{:<30}", "left aligned");
+    
+    spdlog::set_level(spdlog::level::debug); // Set global log level to debug
+    spdlog::debug("This message should be displayed..");    
+    
+    // change log pattern
+    spdlog::set_pattern("[%H:%M:%S %z] [%n] [%^---%L---%$] [thread %t] %v");
+    
+    // Compile time log levels
+    // Note that this does not change the current log level, it will only
+    // remove (depending on SPDLOG_ACTIVE_LEVEL) the call on the release code.
+    SPDLOG_TRACE("Some trace message with param {}", 42);
+    SPDLOG_DEBUG("Some debug message");
+}
+
+```
+---
+#### Create stdout/stderr logger object
 ```c++
 #include "spdlog/spdlog.h"
 #include "spdlog/sinks/stdout_color_sinks.h"
 void stdout_example()
 {
-    // create color multi threaded logger
-    auto console = spdlog::stdout_color_mt("console");
-    console->info("Welcome to spdlog!");
-    console->error("Some error message with arg: {}", 1);
-
-    auto err_logger = spdlog::stderr_color_mt("stderr");
-    err_logger->error("Some error message");
-
-    // Formatting examples
-    console->warn("Easy padding in numbers like {:08d}", 12);
-    console->critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42);
-    console->info("Support for floats {:03.2f}", 1.23456);
-    console->info("Positional args are {1} {0}..", "too", "supported");
-    console->info("{:<30}", "left aligned");
-
+    // create a color multi-threaded logger
+    auto console = spdlog::stdout_color_mt("console");    
+    auto err_logger = spdlog::stderr_color_mt("stderr");    
     spdlog::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name)");
-
-    // Runtime log levels
-    spdlog::set_level(spdlog::level::info); // Set global log level to info
-    console->debug("This message should not be displayed!");
-    console->set_level(spdlog::level::trace); // Set specific logger's log level
-    console->debug("This message should be displayed..");
-
-    // Customize msg format for all loggers
-    spdlog::set_pattern("[%H:%M:%S %z] [%n] [%^---%L---%$] [thread %t] %v");
-    console->info("This an info message with custom format");
-
-    // Compile time log levels
-    // define SPDLOG_DEBUG_ON or SPDLOG_TRACE_ON
-    SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23);
-    SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23);
 }
 ```
+
 ---
 #### Basic file logger
 ```c++
@@ -123,7 +116,7 @@ void basic_logfile_example()
 {
     try 
     {
-        auto my_logger = spdlog::basic_logger_mt("basic_logger", "logs/basic-log.txt");
+        auto logger = spdlog::basic_logger_mt("basic_logger", "logs/basic-log.txt");
     }
     catch (const spdlog::spdlog_ex &ex)
     {
@@ -137,8 +130,10 @@ void basic_logfile_example()
 #include "spdlog/sinks/rotating_file_sink.h"
 void rotating_example()
 {
-    // Create a file rotating logger with 5mb size max and 3 rotated files
-    auto rotating_logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
+    // Create a file rotating logger with 5 MB size max and 3 rotated files
+    auto max_size = 1048576 * 5;
+    auto max_files = 3;
+    auto logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", max_size, max_files);
 }
 ```
 
@@ -149,44 +144,64 @@ void rotating_example()
 #include "spdlog/sinks/daily_file_sink.h"
 void daily_example()
 {
-    // Create a daily logger - a new file is created every day on 2:30am
-    auto daily_logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
+    // Create a daily logger - a new file is created every day at 2:30 am
+    auto logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
 }
 
 ```
 
 ---
-#### Cloning loggers 
+#### Backtrace support
 ```c++
-// clone a logger and give it new name.
-// Useful for creating subsystem loggers from some "root" logger
-void clone_example()
+// Debug messages can be stored in a ring buffer instead of being logged immediately.
+// This is useful to display debug logs only when needed (e.g. when an error happens).
+// When needed, call dump_backtrace() to dump them to your log.
+
+spdlog::enable_backtrace(32); // Store the latest 32 messages in a buffer. 
+// or my_logger->enable_backtrace(32)..
+for(int i = 0; i < 100; i++)
 {
-    auto network_logger = spdlog::get("root")->clone("network");
-    network_logger->info("Logging network stuff..");
+  spdlog::debug("Backtrace message {}", i); // not logged yet..
 }
+// e.g. if some error happened:
+spdlog::dump_backtrace(); // log them now! show the last 32 messages
+// or my_logger->dump_backtrace(32)..
 ```
 
 ---
 #### Periodic flush
 ```c++
 // periodically flush all *registered* loggers every 3 seconds:
-// warning: only use if all your loggers are thread safe!
+// warning: only use if all your loggers are thread-safe ("_mt" loggers)
 spdlog::flush_every(std::chrono::seconds(3));
 
 ```
 
 ---
-#### Binary logging
+#### Stopwatch
+```c++
+// Stopwatch support for spdlog
+#include "spdlog/stopwatch.h"
+void stopwatch_example()
+{
+    spdlog::stopwatch sw;    
+    spdlog::debug("Elapsed {}", sw);
+    spdlog::debug("Elapsed {:.3}", sw);       
+}
+
+```
+
+---
+#### Log binary data in hex
 ```c++
-// log binary data as hex.
 // many types of std::container<char> types can be used.
 // ranges are supported too.
 // format flags:
 // {:X} - print in uppercase.
 // {:s} - don't separate each byte with space.
 // {:p} - don't print the position on each line start.
-// {:n} - don't split the output to lines.
+// {:n} - don't split the output into lines.
+// {:a} - show ASCII if :n is not set.
 
 #include "spdlog/fmt/bin_to_hex.h"
 
@@ -205,11 +220,11 @@ void binary_example()
 ```
 
 ---
-#### Logger with multi sinks - each with different format and log level
+#### Logger with multi sinks - each with a different format and log level
 ```c++
 
-// create logger with 2 targets with different log levels and formats.
-// the console will show only warnings or errors, while the file will log all.
+// create a logger with 2 targets, with different log levels and formats.
+// The console will show only warnings or errors, while the file will log all.
 void multi_sink_example()
 {
     auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
@@ -226,6 +241,27 @@ void multi_sink_example()
 }
 ```
 
+---
+#### User-defined callbacks about log events
+```c++
+
+// create a logger with a lambda function callback, the callback will be called
+// each time something is logged to the logger
+void callback_example()
+{
+    auto callback_sink = std::make_shared<spdlog::sinks::callback_sink_mt>([](const spdlog::details::log_msg &msg) {
+         // for example you can be notified by sending an email to yourself
+    });
+    callback_sink->set_level(spdlog::level::err);
+
+    auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
+    spdlog::logger logger("custom_callback_logger", {console_sink, callback_sink});
+
+    logger.info("some info log");
+    logger.error("critical issue"); // will notify you
+}
+```
+
 ---
 #### Asynchronous logging
 ```c++
@@ -243,8 +279,9 @@ void async_example()
 ```
 
 ---
-#### Asynchronous logger with multi sinks  
+#### Asynchronous logger with multi sinks
 ```c++
+#include "spdlog/async.h"
 #include "spdlog/sinks/stdout_color_sinks.h"
 #include "spdlog/sinks/rotating_file_sink.h"
 
@@ -260,26 +297,54 @@ void multi_sink_example2()
 ```
  
 ---
-#### User defined types
+#### User-defined types
 ```c++
-// user defined types logging by implementing operator<<
-#include "spdlog/fmt/ostr.h" // must be included
-struct my_type
+template<>
+struct fmt::formatter<my_type> : fmt::formatter<std::string>
 {
-    int i;
-    template<typename OStream>
-    friend OStream &operator<<(OStream &os, const my_type &c)
+    auto format(my_type my, format_context &ctx) const -> decltype(ctx.out())
     {
-        return os << "[my_type i=" << c.i << "]";
+        return fmt::format_to(ctx.out(), "[my_type i={}]", my.i);
     }
 };
 
 void user_defined_example()
 {
-    spdlog::get("console")->info("user defined type: {}", my_type{14});
+    spdlog::info("user defined type: {}", my_type(14));
 }
 
 ```
+
+---
+#### User-defined flags in the log pattern
+```c++ 
+// Log patterns can contain custom flags.
+// the following example will add new flag '%*' - which will be bound to a <my_formatter_flag> instance.
+#include "spdlog/pattern_formatter.h"
+class my_formatter_flag : public spdlog::custom_flag_formatter
+{
+public:
+    void format(const spdlog::details::log_msg &, const std::tm &, spdlog::memory_buf_t &dest) override
+    {
+        std::string some_txt = "custom-flag";
+        dest.append(some_txt.data(), some_txt.data() + some_txt.size());
+    }
+
+    std::unique_ptr<custom_flag_formatter> clone() const override
+    {
+        return spdlog::details::make_unique<my_formatter_flag>();
+    }
+};
+
+void custom_flags_example()
+{    
+    auto formatter = std::make_unique<spdlog::pattern_formatter>();
+    formatter->add_flag<my_formatter_flag>('*').set_pattern("[%n] [%*] [%^%l%$] %v");
+    spdlog::set_formatter(std::move(formatter));
+}
+
+```
+
 ---
 #### Custom error handler
 ```c++
@@ -291,8 +356,9 @@ void err_handler_example()
 }
 
 ```
+
 ---
-#### syslog 
+#### syslog
 ```c++
 #include "spdlog/sinks/syslog_sink.h"
 void syslog_example()
@@ -303,16 +369,161 @@ void syslog_example()
 }
 ```
 ---
-#### Android example 
+#### Android example
 ```c++
-#incude "spdlog/sinks/android_sink.h"
+#include "spdlog/sinks/android_sink.h"
 void android_example()
 {
     std::string tag = "spdlog-android";
-    auto android_logger = spdlog::android_logger("android", tag);
+    auto android_logger = spdlog::android_logger_mt("android", tag);
     android_logger->critical("Use \"adb shell logcat\" to view this message.");
 }
 ```
 
+---
+#### Load log levels from the env variable or argv
+
+```c++
+#include "spdlog/cfg/env.h"
+int main (int argc, char *argv[])
+{
+    spdlog::cfg::load_env_levels();
+    // or specify the env variable name:
+    // MYAPP_LEVEL=info,mylogger=trace && ./example
+    // spdlog::cfg::load_env_levels("MYAPP_LEVEL");
+    // or from the command line:
+    // ./example SPDLOG_LEVEL=info,mylogger=trace
+    // #include "spdlog/cfg/argv.h" // for loading levels from argv
+    // spdlog::cfg::load_argv_levels(argc, argv);
+}
+```
+So then you can:
+
+```console
+$ export SPDLOG_LEVEL=info,mylogger=trace
+$ ./example
+```
+
+
+---
+#### Log file open/close event handlers
+```c++
+// You can get callbacks from spdlog before/after a log file has been opened or closed. 
+// This is useful for cleanup procedures or for adding something to the start/end of the log file.
+void file_events_example()
+{
+    // pass the spdlog::file_event_handlers to file sinks for open/close log file notifications
+    spdlog::file_event_handlers handlers;
+    handlers.before_open = [](spdlog::filename_t filename) { spdlog::info("Before opening {}", filename); };
+    handlers.after_open = [](spdlog::filename_t filename, std::FILE *fstream) { fputs("After opening\n", fstream); };
+    handlers.before_close = [](spdlog::filename_t filename, std::FILE *fstream) { fputs("Before closing\n", fstream); };
+    handlers.after_close = [](spdlog::filename_t filename) { spdlog::info("After closing {}", filename); };
+    auto my_logger = spdlog::basic_logger_st("some_logger", "logs/events-sample.txt", true, handlers);        
+}
+```
+
+---
+#### Replace the Default Logger
+```c++
+void replace_default_logger_example()
+{
+    auto new_logger = spdlog::basic_logger_mt("new_default_logger", "logs/new-default-log.txt", true);
+    spdlog::set_default_logger(new_logger);
+    spdlog::info("new logger log message");
+}
+```
+
+---
+#### Log to Qt with nice colors
+```c++
+#include "spdlog/spdlog.h"
+#include "spdlog/sinks/qt_sinks.h"
+MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
+{
+    setMinimumSize(640, 480);
+    auto log_widget = new QTextEdit(this);
+    setCentralWidget(log_widget);
+    int max_lines = 500; // keep the text widget to max 500 lines. remove old lines if needed.
+    auto logger = spdlog::qt_color_logger_mt("qt_logger", log_widget, max_lines);
+    logger->info("Some info message");
+}
+```
+---
+
+#### Mapped Diagnostic Context
+```c++
+// Mapped Diagnostic Context (MDC) is a map that stores key-value pairs (string values) in thread local storage.
+// Each thread maintains its own MDC, which loggers use to append diagnostic information to log outputs.
+// Note: it is not supported in asynchronous mode due to its reliance on thread-local storage.
+#include "spdlog/mdc.h"
+void mdc_example()
+{
+    spdlog::mdc::put("key1", "value1");
+    spdlog::mdc::put("key2", "value2");
+    // if not using the default format, use the %& formatter to print mdc data
+    // spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [%&] %v");
+}
+```
+---
+## Benchmarks
+
+Below are some [benchmarks](bench/bench.cpp) done in Ubuntu 64 bit, Intel i7-4770 CPU @ 3.40GHz
+
+#### Synchronous mode
+```
+[info] **************************************************************
+[info] Single thread, 1,000,000 iterations
+[info] **************************************************************
+[info] basic_st         Elapsed: 0.17 secs        5,777,626/sec
+[info] rotating_st      Elapsed: 0.18 secs        5,475,894/sec
+[info] daily_st         Elapsed: 0.20 secs        5,062,659/sec
+[info] empty_logger     Elapsed: 0.07 secs       14,127,300/sec
+[info] **************************************************************
+[info] C-string (400 bytes). Single thread, 1,000,000 iterations
+[info] **************************************************************
+[info] basic_st         Elapsed: 0.41 secs        2,412,483/sec
+[info] rotating_st      Elapsed: 0.72 secs        1,389,196/sec
+[info] daily_st         Elapsed: 0.42 secs        2,393,298/sec
+[info] null_st          Elapsed: 0.04 secs       27,446,957/sec
+[info] **************************************************************
+[info] 10 threads, competing over the same logger object, 1,000,000 iterations
+[info] **************************************************************
+[info] basic_mt         Elapsed: 0.60 secs        1,659,613/sec
+[info] rotating_mt      Elapsed: 0.62 secs        1,612,493/sec
+[info] daily_mt         Elapsed: 0.61 secs        1,638,305/sec
+[info] null_mt          Elapsed: 0.16 secs        6,272,758/sec
+```
+#### Asynchronous mode
+```
+[info] -------------------------------------------------
+[info] Messages     : 1,000,000
+[info] Threads      : 10
+[info] Queue        : 8,192 slots
+[info] Queue memory : 8,192 x 272 = 2,176 KB 
+[info] -------------------------------------------------
+[info] 
+[info] *********************************
+[info] Queue Overflow Policy: block
+[info] *********************************
+[info] Elapsed: 1.70784 secs     585,535/sec
+[info] Elapsed: 1.69805 secs     588,910/sec
+[info] Elapsed: 1.7026 secs      587,337/sec
+[info] 
+[info] *********************************
+[info] Queue Overflow Policy: overrun
+[info] *********************************
+[info] Elapsed: 0.372816 secs    2,682,285/sec
+[info] Elapsed: 0.379758 secs    2,633,255/sec
+[info] Elapsed: 0.373532 secs    2,677,147/sec
+
+```
+
 ## Documentation
-Documentation can be found in the [wiki](https://github.com/gabime/spdlog/wiki/1.-QuickStart) pages.
+
+Documentation can be found in the [wiki](https://github.com/gabime/spdlog/wiki) pages.
+
+---
+
+Thanks to [JetBrains](https://www.jetbrains.com/?from=spdlog) for donating product licenses to help develop **spdlog** <a href="https://www.jetbrains.com/?from=spdlog"><img src="logos/jetbrains-variant-4.svg" width="94" align="center" /></a>
+
+

appveyor.yml

@@ -1,32 +1,89 @@
 version: 1.0.{build}
-image: Visual Studio 2015
+image: Visual Studio 2017
 environment:
   matrix:
-  - GENERATOR: '"MinGW Makefiles"'
-    BUILD_TYPE: Debug
-  - GENERATOR: '"MinGW Makefiles"'
-    BUILD_TYPE: Release
-  - GENERATOR: '"Visual Studio 14 2015"'
-    BUILD_TYPE: Debug
-  - GENERATOR: '"Visual Studio 14 2015"'
-    BUILD_TYPE: Release
-  - GENERATOR: '"Visual Studio 14 2015 Win64"'
-    BUILD_TYPE: Debug
-  - GENERATOR: '"Visual Studio 14 2015 Win64"'
-    BUILD_TYPE: Release
+    - GENERATOR: '"Visual Studio 15 2017 Win64"'
+      BUILD_TYPE: Debug
+      BUILD_SHARED: 'OFF'
+      FATAL_ERRORS: 'OFF'
+      WCHAR: 'ON'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
+      USE_STD_FORMAT: 'OFF'
+      CXX_STANDARD: 11
+    - GENERATOR: '"Visual Studio 15 2017 Win64"'
+      BUILD_TYPE: Release
+      BUILD_SHARED: 'OFF'
+      FATAL_ERRORS: 'OFF'
+      WCHAR: 'OFF'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
+      USE_STD_FORMAT: 'OFF'
+      CXX_STANDARD: 11
+    - GENERATOR: '"Visual Studio 15 2017 Win64"'
+      BUILD_TYPE: Release
+      BUILD_SHARED: 'ON'
+      FATAL_ERRORS: 'OFF'
+      WCHAR: 'OFF'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
+      USE_STD_FORMAT: 'OFF'
+      CXX_STANDARD: 11
+    - GENERATOR: '"Visual Studio 15 2017 Win64"'
+      BUILD_TYPE: Release
+      BUILD_SHARED: 'ON'
+      FATAL_ERRORS: 'OFF'
+      WCHAR: 'ON'
+      WCHAR_FILES: 'ON'
+      BUILD_EXAMPLE: 'OFF'
+      USE_STD_FORMAT: 'OFF'
+      CXX_STANDARD: 11
+    - GENERATOR: '"Visual Studio 16 2019" -A x64'
+      BUILD_TYPE: Release
+      BUILD_SHARED: 'ON'
+      FATAL_ERRORS: 'ON'
+      WCHAR: 'OFF'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'OFF'
+      USE_STD_FORMAT: 'OFF'
+      CXX_STANDARD: 17
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+    - GENERATOR: '"Visual Studio 17 2022" -A x64'
+      BUILD_TYPE: Release
+      BUILD_SHARED: 'ON'
+      FATAL_ERRORS: 'ON'
+      WCHAR: 'OFF'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'OFF'
+      USE_STD_FORMAT: 'ON'
+      CXX_STANDARD: 20
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
+    - GENERATOR: '"Visual Studio 17 2022" -A x64'
+      BUILD_TYPE: Release
+      BUILD_SHARED: 'ON'
+      FATAL_ERRORS: 'ON'
+      WCHAR: 'ON'
+      WCHAR_FILES: 'ON'
+      BUILD_EXAMPLE: 'OFF'
+      USE_STD_FORMAT: 'ON'
+      CXX_STANDARD: 20
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
 build_script:
-- cmd: >-
-    set
+  - cmd: >-
+      set
 
-    mkdir build
+      mkdir build
 
-    cd build
+      cd build
 
-    set PATH=%PATH:C:\Program Files\Git\usr\bin;=%
+      set PATH=%PATH%;C:\Program Files\Git\usr\bin
 
-    set PATH=C:\mingw-w64\i686-5.3.0-posix-dwarf-rt_v4-rev0\mingw32\bin;%PATH%
+      cmake -G %GENERATOR% -D CMAKE_BUILD_TYPE=%BUILD_TYPE% -D BUILD_SHARED_LIBS=%BUILD_SHARED% -D SPDLOG_WCHAR_SUPPORT=%WCHAR% -D SPDLOG_WCHAR_FILENAMES=%WCHAR_FILES% -D SPDLOG_BUILD_EXAMPLE=%BUILD_EXAMPLE% -D SPDLOG_BUILD_EXAMPLE_HO=%BUILD_EXAMPLE% -D SPDLOG_BUILD_TESTS=ON -D SPDLOG_BUILD_TESTS_HO=OFF -D SPDLOG_BUILD_WARNINGS=%FATAL_ERRORS% -D SPDLOG_USE_STD_FORMAT=%USE_STD_FORMAT% -D CMAKE_CXX_STANDARD=%CXX_STANDARD% ..
 
-    cmake .. -G %GENERATOR% -DCMAKE_BUILD_TYPE=%BUILD_TYPE%
+      cmake --build . --config %BUILD_TYPE%
 
-    cmake --build . --config %BUILD_TYPE%
-test: off
+before_test:
+  - set PATH=%PATH%;C:\projects\spdlog\build\_deps\catch2-build\src\%BUILD_TYPE%;C:\projects\spdlog\build\%BUILD_TYPE%
+  
+test_script:
+  - C:\projects\spdlog\build\tests\%BUILD_TYPE%\spdlog-utests.exe

bench/CMakeLists.txt

@@ -1,43 +1,37 @@
-# *************************************************************************/
-# * Copyright (c) 2015 Ruslan Baratov.                                    */
-# *                                                                       */
-# * Permission is hereby granted, free of charge, to any person obtaining */
-# * a copy of this software and associated documentation files (the       */
-# * "Software"), to deal in the Software without restriction, including   */
-# * without limitation the rights to use, copy, modify, merge, publish,   */
-# * distribute, sublicense, and/or sell copies of the Software, and to    */
-# * permit persons to whom the Software is furnished to do so, subject to */
-# * the following conditions:                                             */
-# *                                                                       */
-# * The above copyright notice and this permission notice shall be        */
-# * included in all copies or substantial portions of the Software.       */
-# *                                                                       */
-# * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-# * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-# * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-# * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-# * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-# * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-# * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-# *************************************************************************/
+# Copyright(c) 2019 spdlog authors Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
-cmake_minimum_required(VERSION 3.1)
-project(SpdlogBench CXX)
+cmake_minimum_required(VERSION 3.11)
+project(spdlog_bench CXX)
 
 if(NOT TARGET spdlog)
-  # Stand-alone build
-  find_package(spdlog CONFIG REQUIRED)
+    # Stand-alone build
+    find_package(spdlog CONFIG REQUIRED)
 endif()
 
 find_package(Threads REQUIRED)
+find_package(benchmark CONFIG)
+if(NOT benchmark_FOUND)
+    message(STATUS "Using CMake Version ${CMAKE_VERSION}")
+    # User can fetch googlebenchmark
+    message(STATUS "Downloading GoogleBenchmark")
+    include(FetchContent)
+
+    # disable tests
+    set(BENCHMARK_ENABLE_TESTING OFF CACHE INTERNAL "")
+    # Do not build and run googlebenchmark tests
+    FetchContent_Declare(googlebenchmark GIT_REPOSITORY https://github.com/google/benchmark.git GIT_TAG v1.6.0)
+    FetchContent_MakeAvailable(googlebenchmark)
+endif()
 
 add_executable(bench bench.cpp)
-target_link_libraries(bench spdlog::spdlog Threads::Threads)
+spdlog_enable_warnings(bench)
+target_link_libraries(bench PRIVATE spdlog::spdlog)
 
 add_executable(async_bench async_bench.cpp)
-target_link_libraries(async_bench spdlog::spdlog Threads::Threads)
+target_link_libraries(async_bench PRIVATE spdlog::spdlog)
 
 add_executable(latency latency.cpp)
-target_link_libraries(latency spdlog::spdlog Threads::Threads)
+target_link_libraries(latency PRIVATE benchmark::benchmark spdlog::spdlog)
 
-file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/logs")
+add_executable(formatter-bench formatter-bench.cpp)
+target_link_libraries(formatter-bench PRIVATE benchmark::benchmark spdlog::spdlog)

bench/Makefile

@@ -1,27 +0,0 @@
-CXX	?= g++
-CXXFLAGS	= -march=native -Wall -Wextra -pedantic -std=c++11 -pthread -I../include -fmax-errors=1
-CXX_RELEASE_FLAGS = -Ofast -flto -Wl,--no-as-needed
-
-
-binaries=bench latency async_bench
-
-all: $(binaries)
-
-bench: bench.cpp
-	$(CXX) bench.cpp -o bench $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
-	
-
-async_bench: async_bench.cpp
-	$(CXX) async_bench.cpp -o async_bench $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
-	
-	
-latency: latency.cpp
-	$(CXX) latency.cpp -o latency $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
-				
-
-.PHONY: clean
-
-clean:
-	rm -f *.o logs/* $(binaries)
-
-rebuild: clean all

bench/async_bench.cpp

@@ -6,10 +6,18 @@
 //
 // bench.cpp : spdlog benchmarks
 //
+#include "spdlog/spdlog.h"
 #include "spdlog/async.h"
 #include "spdlog/sinks/basic_file_sink.h"
-#include "spdlog/sinks/stdout_color_sinks.h"
-#include "spdlog/spdlog.h"
+
+#if defined(SPDLOG_USE_STD_FORMAT)
+    #include <format>
+#elif defined(SPDLOG_FMT_EXTERNAL)
+    #include <fmt/format.h>
+#else
+    #include "spdlog/fmt/bundled/format.h"
+#endif
+
 #include "utils.h"
 #include <atomic>
 #include <iostream>
@@ -25,78 +33,103 @@ using namespace utils;
 
 void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count);
 
-int count_lines(const char *filename)
-{
+#ifdef _MSC_VER
+    #pragma warning(push)
+    #pragma warning(disable : 4996)  // disable fopen warning under msvc
+#endif                               // _MSC_VER
+
+int count_lines(const char *filename) {
     int counter = 0;
     auto *infile = fopen(filename, "r");
     int ch;
-    while (EOF != (ch = getc(infile)))
-    {
-        if ('\n' == ch)
-            counter++;
+    while (EOF != (ch = getc(infile))) {
+        if ('\n' == ch) counter++;
     }
     fclose(infile);
 
     return counter;
 }
-int main(int argc, char *argv[])
-{
 
+void verify_file(const char *filename, int expected_count) {
+    spdlog::info("Verifying {} to contain {} line..", filename, expected_count);
+    auto count = count_lines(filename);
+    if (count != expected_count) {
+        spdlog::error("Test failed. {} has {} lines instead of {}", filename, count,
+                      expected_count);
+        exit(1);
+    }
+    spdlog::info("Line count OK ({})\n", count);
+}
+
+#ifdef _MSC_VER
+    #pragma warning(pop)
+#endif
+
+int main(int argc, char *argv[]) {
     int howmany = 1000000;
-    int queue_size = howmany + 2;
+    int queue_size = std::min(howmany + 2, 8192);
     int threads = 10;
     int iters = 3;
 
-    try
-    {
-        auto console = spdlog::stdout_color_mt("console");
-        if (argc == 1)
-        {
-            console->set_pattern("%v");
-            console->info("Usage: {} <message_count> <threads> <q_size> <iterations>", argv[0]);
+    try {
+        spdlog::set_pattern("[%^%l%$] %v");
+        if (argc == 1) {
+            spdlog::info("Usage: {} <message_count> <threads> <q_size> <iterations>", argv[0]);
             return 0;
         }
 
-        if (argc > 1)
-            howmany = atoi(argv[1]);
-        if (argc > 2)
-            threads = atoi(argv[2]);
-        if (argc > 3)
+        if (argc > 1) howmany = atoi(argv[1]);
+        if (argc > 2) threads = atoi(argv[2]);
+        if (argc > 3) {
             queue_size = atoi(argv[3]);
-
-        if (argc > 4)
-            iters = atoi(argv[4]);
-
-        console->info("-------------------------------------------------");
-        console->info("Messages: {:14n}", howmany);
-        console->info("Threads : {:14n}", threads);
-        console->info("Queue   : {:14n}", queue_size);
-        console->info("Iters   : {:>14n}", iters);
-        console->info("-------------------------------------------------");
-
-        const char *filename = "logs/basic_async.log";
-
-        for (int i = 0; i < iters; i++)
-        {
-            auto tp = std::make_shared<details::thread_pool>(queue_size, 1);
-            auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>(filename, true);
-            auto logger = std::make_shared<async_logger>("async_logger", std::move(file_sink), std::move(tp), async_overflow_policy::block);
-            bench_mt(howmany, std::move(logger), threads);
-            auto count = count_lines(filename);
-
-            if (count != howmany)
-            {
-                console->error("Test failed. {} has {:n} lines instead of {:n}", filename, count, howmany);
+            if (queue_size > 500000) {
+                spdlog::error("Max queue size allowed: 500,000");
                 exit(1);
             }
-            else
-            {
-                console->info("Line count OK ({:n})\n", count);
-            }
         }
-    }
-    catch (std::exception &ex)
-    {
+
+        if (argc > 4) iters = atoi(argv[4]);
+
+        auto slot_size = sizeof(spdlog::details::async_msg);
+        spdlog::info("-------------------------------------------------");
+        spdlog::info("Messages     : {:L}", howmany);
+        spdlog::info("Threads      : {:L}", threads);
+        spdlog::info("Queue        : {:L} slots", queue_size);
+        spdlog::info("Queue memory : {:L} x {:L} = {:L} KB ", queue_size, slot_size,
+                     (queue_size * slot_size) / 1024);
+        spdlog::info("Total iters  : {:L}", iters);
+        spdlog::info("-------------------------------------------------");
+
+        const char *filename = "logs/basic_async.log";
+        spdlog::info("");
+        spdlog::info("*********************************");
+        spdlog::info("Queue Overflow Policy: block");
+        spdlog::info("*********************************");
+        for (int i = 0; i < iters; i++) {
+            auto tp = std::make_shared<details::thread_pool>(queue_size, 1);
+            auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>(filename, true);
+            auto logger = std::make_shared<async_logger>(
+                "async_logger", std::move(file_sink), std::move(tp), async_overflow_policy::block);
+            bench_mt(howmany, std::move(logger), threads);
+            // verify_file(filename, howmany);
+        }
+
+        spdlog::info("");
+        spdlog::info("*********************************");
+        spdlog::info("Queue Overflow Policy: overrun");
+        spdlog::info("*********************************");
+        // do same test but discard oldest if queue is full instead of blocking
+        filename = "logs/basic_async-overrun.log";
+        for (int i = 0; i < iters; i++) {
+            auto tp = std::make_shared<details::thread_pool>(queue_size, 1);
+            auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>(filename, true);
+            auto logger =
+                std::make_shared<async_logger>("async_logger", std::move(file_sink), std::move(tp),
+                                               async_overflow_policy::overrun_oldest);
+            bench_mt(howmany, std::move(logger), threads);
+        }
+        spdlog::shutdown();
+    } catch (std::exception &ex) {
         std::cerr << "Error: " << ex.what() << std::endl;
         perror("Last error");
         return 1;
@@ -104,36 +137,32 @@ int main(int argc, char *argv[])
     return 0;
 }
 
-void thread_fun(std::shared_ptr<spdlog::logger> logger, int howmany)
-{
-    for (int i = 0; i < howmany; i++)
-    {
+void thread_fun(std::shared_ptr<spdlog::logger> logger, int howmany) {
+    for (int i = 0; i < howmany; i++) {
         logger->info("Hello logger: msg number {}", i);
     }
 }
 
-void bench_mt(int howmany, std::shared_ptr<spdlog::logger> logger, int thread_count)
-{
+void bench_mt(int howmany, std::shared_ptr<spdlog::logger> logger, int thread_count) {
     using std::chrono::high_resolution_clock;
-    vector<thread> threads;
+    vector<std::thread> threads;
     auto start = high_resolution_clock::now();
 
     int msgs_per_thread = howmany / thread_count;
     int msgs_per_thread_mod = howmany % thread_count;
-    for (int t = 0; t < thread_count; ++t)
-    {
+    for (int t = 0; t < thread_count; ++t) {
         if (t == 0 && msgs_per_thread_mod)
-            threads.push_back(std::thread(thread_fun, logger, msgs_per_thread + msgs_per_thread_mod));
+            threads.push_back(
+                std::thread(thread_fun, logger, msgs_per_thread + msgs_per_thread_mod));
         else
             threads.push_back(std::thread(thread_fun, logger, msgs_per_thread));
     }
 
-    for (auto &t : threads)
-    {
+    for (auto &t : threads) {
         t.join();
-    };
+    }
 
     auto delta = high_resolution_clock::now() - start;
     auto delta_d = duration_cast<duration<double>>(delta).count();
-    spdlog::get("console")->info("Elapsed: {} secs\t {:n}/sec", delta_d, int(howmany / delta_d));
+    spdlog::info("Elapsed: {} secs\t {:L}/sec", delta_d, int(howmany / delta_d));
 }

bench/bench.cpp

@@ -6,143 +6,241 @@
 //
 // bench.cpp : spdlog benchmarks
 //
-#include "spdlog/async.h"
+#include "spdlog/spdlog.h"
 #include "spdlog/sinks/basic_file_sink.h"
 #include "spdlog/sinks/daily_file_sink.h"
 #include "spdlog/sinks/null_sink.h"
 #include "spdlog/sinks/rotating_file_sink.h"
-#include "spdlog/spdlog.h"
+
+#if defined(SPDLOG_USE_STD_FORMAT)
+    #include <format>
+#elif defined(SPDLOG_FMT_EXTERNAL)
+    #include <fmt/format.h>
+#else
+    #include "spdlog/fmt/bundled/format.h"
+#endif
+
 #include "utils.h"
 #include <atomic>
-#include <cstdlib> // EXIT_FAILURE
-#include <iostream>
+#include <cstdlib>  // EXIT_FAILURE
 #include <memory>
 #include <string>
 #include <thread>
 
-using namespace std;
-using namespace std::chrono;
-using namespace spdlog;
-using namespace spdlog::sinks;
-using namespace utils;
-
 void bench(int howmany, std::shared_ptr<spdlog::logger> log);
-void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count);
+void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, size_t thread_count);
 
-int main(int argc, char *argv[])
-{
+// void bench_default_api(int howmany, std::shared_ptr<spdlog::logger> log);
+// void bench_c_string(int howmany, std::shared_ptr<spdlog::logger> log);
 
-    int howmany = 1000000;
-    int queue_size = howmany + 2;
-    int threads = 10;
-    size_t file_size = 30 * 1024 * 1024;
-    size_t rotating_files = 5;
+static const size_t file_size = 30 * 1024 * 1024;
+static const size_t rotating_files = 5;
+static const int max_threads = 1000;
 
-    try
-    {
+void bench_threaded_logging(size_t threads, int iters) {
+    spdlog::info("**************************************************************");
+    spdlog::info(spdlog::fmt_lib::format(
+        std::locale("en_US.UTF-8"), "Multi threaded: {:L} threads, {:L} messages", threads, iters));
+    spdlog::info("**************************************************************");
 
-        if (argc > 1)
-            howmany = atoi(argv[1]);
-        if (argc > 2)
-            threads = atoi(argv[2]);
-        if (argc > 3)
-            queue_size = atoi(argv[3]);
+    auto basic_mt = spdlog::basic_logger_mt("basic_mt", "logs/basic_mt.log", true);
+    bench_mt(iters, std::move(basic_mt), threads);
+    auto basic_mt_tracing =
+        spdlog::basic_logger_mt("basic_mt/backtrace-on", "logs/basic_mt.log", true);
+    basic_mt_tracing->enable_backtrace(32);
+    bench_mt(iters, std::move(basic_mt_tracing), threads);
 
-        cout << "******************************************************************"
-                "*************\n";
-        cout << "Single thread, " << format(howmany) << " iterations" << endl;
-        cout << "******************************************************************"
-                "*************\n";
+    spdlog::info("");
+    auto rotating_mt = spdlog::rotating_logger_mt("rotating_mt", "logs/rotating_mt.log", file_size,
+                                                  rotating_files);
+    bench_mt(iters, std::move(rotating_mt), threads);
+    auto rotating_mt_tracing = spdlog::rotating_logger_mt(
+        "rotating_mt/backtrace-on", "logs/rotating_mt.log", file_size, rotating_files);
+    rotating_mt_tracing->enable_backtrace(32);
+    bench_mt(iters, std::move(rotating_mt_tracing), threads);
 
-        auto basic_st = spdlog::basic_logger_st("basic_st", "logs/basic_st.log", true);
-        bench(howmany, basic_st);
+    spdlog::info("");
+    auto daily_mt = spdlog::daily_logger_mt("daily_mt", "logs/daily_mt.log");
+    bench_mt(iters, std::move(daily_mt), threads);
+    auto daily_mt_tracing = spdlog::daily_logger_mt("daily_mt/backtrace-on", "logs/daily_mt.log");
+    daily_mt_tracing->enable_backtrace(32);
+    bench_mt(iters, std::move(daily_mt_tracing), threads);
 
-        auto rotating_st = spdlog::rotating_logger_st("rotating_st", "logs/rotating_st.log", file_size, rotating_files);
-        bench(howmany, rotating_st);
+    spdlog::info("");
+    auto empty_logger = std::make_shared<spdlog::logger>("level-off");
+    empty_logger->set_level(spdlog::level::off);
+    bench(iters, empty_logger);
+    auto empty_logger_tracing = std::make_shared<spdlog::logger>("level-off/backtrace-on");
+    empty_logger_tracing->set_level(spdlog::level::off);
+    empty_logger_tracing->enable_backtrace(32);
+    bench(iters, empty_logger_tracing);
+}
 
-        auto daily_st = spdlog::daily_logger_st("daily_st", "logs/daily_st.log");
-        bench(howmany, daily_st);
+void bench_single_threaded(int iters) {
+    spdlog::info("**************************************************************");
+    spdlog::info(
+        spdlog::fmt_lib::format(std::locale("en_US.UTF-8"), "Single threaded: {} messages", iters));
+    spdlog::info("**************************************************************");
 
-        bench(howmany, spdlog::create<null_sink_st>("null_st"));
+    auto basic_st = spdlog::basic_logger_st("basic_st", "logs/basic_st.log", true);
+    bench(iters, std::move(basic_st));
 
-        cout << "\n****************************************************************"
-                "***************\n";
-        cout << threads << " threads sharing same logger, " << format(howmany) << " iterations" << endl;
-        cout << "******************************************************************"
-                "*************\n";
+    auto basic_st_tracing =
+        spdlog::basic_logger_st("basic_st/backtrace-on", "logs/basic_st.log", true);
+    bench(iters, std::move(basic_st_tracing));
 
-        auto basic_mt = spdlog::basic_logger_mt("basic_mt", "logs/basic_mt.log", true);
-        bench_mt(howmany, basic_mt, threads);
+    spdlog::info("");
+    auto rotating_st = spdlog::rotating_logger_st("rotating_st", "logs/rotating_st.log", file_size,
+                                                  rotating_files);
+    bench(iters, std::move(rotating_st));
+    auto rotating_st_tracing = spdlog::rotating_logger_st(
+        "rotating_st/backtrace-on", "logs/rotating_st.log", file_size, rotating_files);
+    rotating_st_tracing->enable_backtrace(32);
+    bench(iters, std::move(rotating_st_tracing));
 
-        auto rotating_mt = spdlog::rotating_logger_mt("rotating_mt", "logs/rotating_mt.log", file_size, rotating_files);
-        bench_mt(howmany, rotating_mt, threads);
+    spdlog::info("");
+    auto daily_st = spdlog::daily_logger_st("daily_st", "logs/daily_st.log");
+    bench(iters, std::move(daily_st));
+    auto daily_st_tracing = spdlog::daily_logger_st("daily_st/backtrace-on", "logs/daily_st.log");
+    daily_st_tracing->enable_backtrace(32);
+    bench(iters, std::move(daily_st_tracing));
 
-        auto daily_mt = spdlog::daily_logger_mt("daily_mt", "logs/daily_mt.log");
-        bench_mt(howmany, daily_mt, threads);
-        bench_mt(howmany, spdlog::create<null_sink_mt>("null_mt"), threads);
+    spdlog::info("");
+    auto empty_logger = std::make_shared<spdlog::logger>("level-off");
+    empty_logger->set_level(spdlog::level::off);
+    bench(iters, empty_logger);
 
-        cout << "\n****************************************************************"
-                "***************\n";
-        cout << "async logging.. " << threads << " threads sharing same logger, " << format(howmany) << " iterations " << endl;
-        cout << "******************************************************************"
-                "*************\n";
+    auto empty_logger_tracing = std::make_shared<spdlog::logger>("level-off/backtrace-on");
+    empty_logger_tracing->set_level(spdlog::level::off);
+    empty_logger_tracing->enable_backtrace(32);
+    bench(iters, empty_logger_tracing);
+}
 
-        for (int i = 0; i < 3; ++i)
-        {
-            spdlog::init_thread_pool(static_cast<size_t>(queue_size), 1);
-            auto as = spdlog::basic_logger_mt<spdlog::async_factory>("async", "logs/basic_async.log", true);
-            bench_mt(howmany, as, threads);
-            spdlog::drop("async");
+int main(int argc, char *argv[]) {
+    spdlog::set_automatic_registration(false);
+    spdlog::default_logger()->set_pattern("[%^%l%$] %v");
+    int iters = 250000;
+    size_t threads = 4;
+    try {
+        if (argc > 1) {
+            iters = std::stoi(argv[1]);
         }
-    }
-    catch (std::exception &ex)
-    {
-        std::cerr << "Error: " << ex.what() << std::endl;
-        perror("Last error");
+        if (argc > 2) {
+            threads = std::stoul(argv[2]);
+        }
+
+        if (threads > max_threads) {
+            throw std::runtime_error(
+                spdlog::fmt_lib::format("Number of threads exceeds maximum({})", max_threads));
+        }
+
+        bench_single_threaded(iters);
+        bench_threaded_logging(1, iters);
+        bench_threaded_logging(threads, iters);
+    } catch (std::exception &ex) {
+        spdlog::error(ex.what());
         return EXIT_FAILURE;
     }
     return EXIT_SUCCESS;
 }
 
-void bench(int howmany, std::shared_ptr<spdlog::logger> log)
-{
+void bench(int howmany, std::shared_ptr<spdlog::logger> log) {
+    using std::chrono::duration;
+    using std::chrono::duration_cast;
     using std::chrono::high_resolution_clock;
-    cout << log->name() << "...\t\t" << flush;
+
     auto start = high_resolution_clock::now();
-    for (auto i = 0; i < howmany; ++i)
-    {
+    for (auto i = 0; i < howmany; ++i) {
         log->info("Hello logger: msg number {}", i);
     }
 
     auto delta = high_resolution_clock::now() - start;
     auto delta_d = duration_cast<duration<double>>(delta).count();
 
-    cout << "Elapsed: " << delta_d << "\t" << format(int(howmany / delta_d)) << "/sec" << endl;
+    spdlog::info(spdlog::fmt_lib::format(std::locale("en_US.UTF-8"),
+                                         "{:<30} Elapsed: {:0.2f} secs {:>16L}/sec", log->name(),
+                                         delta_d, size_t(howmany / delta_d)));
     spdlog::drop(log->name());
 }
 
-void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count)
-{
+void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, size_t thread_count) {
+    using std::chrono::duration;
+    using std::chrono::duration_cast;
     using std::chrono::high_resolution_clock;
-    cout << log->name() << "...\t\t" << flush;
-    vector<thread> threads;
+
+    std::vector<std::thread> threads;
+    threads.reserve(thread_count);
     auto start = high_resolution_clock::now();
-    for (int t = 0; t < thread_count; ++t)
-    {
-        threads.push_back(std::thread([&]() {
-            for (int j = 0; j < howmany / thread_count; j++)
-            {
+    for (size_t t = 0; t < thread_count; ++t) {
+        threads.emplace_back([&]() {
+            for (int j = 0; j < howmany / static_cast<int>(thread_count); j++) {
                 log->info("Hello logger: msg number {}", j);
             }
-        }));
+        });
     }
 
-    for (auto &t : threads)
-    {
+    for (auto &t : threads) {
         t.join();
-    };
+    }
 
     auto delta = high_resolution_clock::now() - start;
     auto delta_d = duration_cast<duration<double>>(delta).count();
-    cout << "Elapsed: " << delta_d << "\t" << format(int(howmany / delta_d)) << "/sec" << endl;
+    spdlog::info(spdlog::fmt_lib::format(std::locale("en_US.UTF-8"),
+                                         "{:<30} Elapsed: {:0.2f} secs {:>16L}/sec", log->name(),
+                                         delta_d, size_t(howmany / delta_d)));
+    spdlog::drop(log->name());
 }
+
+/*
+void bench_default_api(int howmany, std::shared_ptr<spdlog::logger> log)
+{
+    using std::chrono::high_resolution_clock;
+    using std::chrono::duration;
+    using std::chrono::duration_cast;
+
+    auto orig_default = spdlog::default_logger();
+    spdlog::set_default_logger(log);
+    auto start = high_resolution_clock::now();
+    for (auto i = 0; i < howmany; ++i)
+    {
+        spdlog::info("Hello logger: msg number {}", i);
+    }
+
+    auto delta = high_resolution_clock::now() - start;
+    auto delta_d = duration_cast<duration<double>>(delta).count();
+    spdlog::drop(log->name());
+    spdlog::set_default_logger(std::move(orig_default));
+    spdlog::info("{:<30} Elapsed: {:0.2f} secs {:>16}/sec", log->name(), delta_d, int(howmany /
+delta_d));
+}
+
+void bench_c_string(int howmany, std::shared_ptr<spdlog::logger> log)
+{
+    using std::chrono::high_resolution_clock;
+    using std::chrono::duration;
+    using std::chrono::duration_cast;
+
+    const char *msg = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum pharetra
+metus cursus " "lacus placerat congue. Nulla egestas, mauris a tincidunt tempus, enim lectus
+volutpat mi, eu consequat sem " "libero nec massa. In dapibus ipsum a diam rhoncus gravida. Etiam
+non dapibus eros. Donec fringilla dui sed " "augue pretium, nec scelerisque est maximus. Nullam
+convallis, sem nec blandit maximus, nisi turpis ornare " "nisl, sit amet volutpat neque massa eu
+odio. Maecenas malesuada quam ex, posuere congue nibh turpis duis.";
+
+    auto orig_default = spdlog::default_logger();
+    spdlog::set_default_logger(log);
+    auto start = high_resolution_clock::now();
+    for (auto i = 0; i < howmany; ++i)
+    {
+        spdlog::log(spdlog::level::info, msg);
+    }
+
+    auto delta = high_resolution_clock::now() - start;
+    auto delta_d = duration_cast<duration<double>>(delta).count();
+    spdlog::drop(log->name());
+    spdlog::set_default_logger(std::move(orig_default));
+    spdlog::info("{:<30} Elapsed: {:0.2f} secs {:>16}/sec", log->name(), delta_d, int(howmany /
+delta_d));
+}
+
+*/

bench/formatter-bench.cpp

@@ -0,0 +1,71 @@
+//
+// Copyright(c) 2018 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#include "benchmark/benchmark.h"
+
+#include "spdlog/spdlog.h"
+#include "spdlog/pattern_formatter.h"
+
+void bench_formatter(benchmark::State &state, std::string pattern) {
+    auto formatter = spdlog::details::make_unique<spdlog::pattern_formatter>(pattern);
+    spdlog::memory_buf_t dest;
+    std::string logger_name = "logger-name";
+    const char *text =
+        "Hello. This is some message with length of 80                                   ";
+
+    spdlog::source_loc source_loc{"a/b/c/d/myfile.cpp", 123, "some_func()"};
+    spdlog::details::log_msg msg(source_loc, logger_name, spdlog::level::info, text);
+
+    for (auto _ : state) {
+        dest.clear();
+        formatter->format(msg, dest);
+        benchmark::DoNotOptimize(dest);
+    }
+}
+
+void bench_formatters() {
+    // basic patterns(single flag)
+    std::string all_flags = "+vtPnlLaAbBcCYDmdHIMSefFprRTXzEisg@luioO%";
+    std::vector<std::string> basic_patterns;
+    for (auto &flag : all_flags) {
+        auto pattern = std::string("%") + flag;
+        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern);
+
+        //        pattern = std::string("%16") + flag;
+        //        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern);
+        //
+        //        // bench center padding
+        //        pattern = std::string("%=16") + flag;
+        //        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern);
+    }
+
+    // complex patterns
+    std::vector<std::string> patterns = {
+        "[%D %X] [%l] [%n] %v",
+        "[%Y-%m-%d %H:%M:%S.%e] [%l] [%n] %v",
+        "[%Y-%m-%d %H:%M:%S.%e] [%l] [%n] [%t] %v",
+    };
+    for (auto &pattern : patterns) {
+        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern)
+            ->Iterations(2500000);
+    }
+}
+
+int main(int argc, char *argv[]) {
+    spdlog::set_pattern("[%^%l%$] %v");
+    if (argc != 2) {
+        spdlog::error("Usage: {} <pattern> (or \"all\" to bench all)", argv[0]);
+        exit(1);
+    }
+
+    std::string pattern = argv[1];
+    if (pattern == "all") {
+        bench_formatters();
+    } else {
+        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern);
+    }
+    benchmark::Initialize(&argc, argv);
+    benchmark::RunSpecifiedBenchmarks();
+}

bench/latency.cpp

@@ -6,146 +6,215 @@
 //
 // latency.cpp : spdlog latency benchmarks
 //
+
+#include "benchmark/benchmark.h"
+
+#include "spdlog/spdlog.h"
 #include "spdlog/async.h"
 #include "spdlog/sinks/basic_file_sink.h"
 #include "spdlog/sinks/daily_file_sink.h"
 #include "spdlog/sinks/null_sink.h"
 #include "spdlog/sinks/rotating_file_sink.h"
-#include "spdlog/spdlog.h"
-#include "utils.h"
-#include <atomic>
-#include <cstdlib>
-#include <iostream>
-#include <memory>
-#include <string>
-#include <thread>
 
-using namespace std;
-using namespace std::chrono;
-using namespace spdlog;
-using namespace spdlog::sinks;
-using namespace utils;
+void bench_c_string(benchmark::State &state, std::shared_ptr<spdlog::logger> logger) {
+    const char *msg =
+        "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum pharetra metus cursus "
+        "lacus placerat congue. Nulla egestas, mauris a tincidunt tempus, enim lectus volutpat mi, "
+        "eu consequat sem "
+        "libero nec massa. In dapibus ipsum a diam rhoncus gravida. Etiam non dapibus eros. Donec "
+        "fringilla dui sed "
+        "augue pretium, nec scelerisque est maximus. Nullam convallis, sem nec blandit maximus, "
+        "nisi turpis ornare "
+        "nisl, sit amet volutpat neque massa eu odio. Maecenas malesuada quam ex, posuere congue "
+        "nibh turpis duis.";
 
-void bench(int howmany, std::shared_ptr<spdlog::logger> log);
-void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count);
+    for (auto _ : state) {
+        logger->info(msg);
+    }
+}
+
+void bench_logger(benchmark::State &state, std::shared_ptr<spdlog::logger> logger) {
+    int i = 0;
+    for (auto _ : state) {
+        logger->info("Hello logger: msg number {}...............", ++i);
+    }
+}
+void bench_global_logger(benchmark::State &state, std::shared_ptr<spdlog::logger> logger) {
+    spdlog::set_default_logger(std::move(logger));
+    int i = 0;
+    for (auto _ : state) {
+        spdlog::info("Hello logger: msg number {}...............", ++i);
+    }
+}
+
+void bench_disabled_macro(benchmark::State &state, std::shared_ptr<spdlog::logger> logger) {
+    int i = 0;
+    benchmark::DoNotOptimize(i);       // prevent unused warnings
+    benchmark::DoNotOptimize(logger);  // prevent unused warnings
+    for (auto _ : state) {
+        SPDLOG_LOGGER_DEBUG(logger, "Hello logger: msg number {}...............", i++);
+    }
+}
+
+void bench_disabled_macro_global_logger(benchmark::State &state,
+                                        std::shared_ptr<spdlog::logger> logger) {
+    spdlog::set_default_logger(std::move(logger));
+    int i = 0;
+    benchmark::DoNotOptimize(i);       // prevent unused warnings
+    benchmark::DoNotOptimize(logger);  // prevent unused warnings
+    for (auto _ : state) {
+        SPDLOG_DEBUG("Hello logger: msg number {}...............", i++);
+    }
+}
+
+#ifdef __linux__
+void bench_dev_null() {
+    auto dev_null_st = spdlog::basic_logger_st("/dev/null_st", "/dev/null");
+    benchmark::RegisterBenchmark("/dev/null_st", bench_logger, std::move(dev_null_st))
+        ->UseRealTime();
+    spdlog::drop("/dev/null_st");
+
+    auto dev_null_mt = spdlog::basic_logger_mt("/dev/null_mt", "/dev/null");
+    benchmark::RegisterBenchmark("/dev/null_mt", bench_logger, std::move(dev_null_mt))
+        ->UseRealTime();
+    spdlog::drop("/dev/null_mt");
+}
+#endif  // __linux__
+
+int main(int argc, char *argv[]) {
+    using spdlog::sinks::null_sink_mt;
+    using spdlog::sinks::null_sink_st;
 
-int main(int, char *[])
-{
-    std::srand(static_cast<unsigned>(std::time(nullptr))); // use current time as seed for random generator
-    int howmany = 1000000;
-    int queue_size = howmany + 2;
-    int threads = 10;
     size_t file_size = 30 * 1024 * 1024;
     size_t rotating_files = 5;
+    int n_threads = benchmark::CPUInfo::Get().num_cpus;
 
-    try
-    {
+    auto full_bench = argc > 1 && std::string(argv[1]) == "full";
 
-        cout << "******************************************************************"
-                "*************\n";
-        cout << "Single thread\n";
-        cout << "******************************************************************"
-                "*************\n";
+    // disabled loggers
+    auto disabled_logger =
+        std::make_shared<spdlog::logger>("bench", std::make_shared<null_sink_mt>());
+    disabled_logger->set_level(spdlog::level::off);
+    benchmark::RegisterBenchmark("disabled-at-compile-time", bench_disabled_macro, disabled_logger);
+    benchmark::RegisterBenchmark("disabled-at-compile-time (global logger)",
+                                 bench_disabled_macro_global_logger, disabled_logger);
+    benchmark::RegisterBenchmark("disabled-at-runtime", bench_logger, disabled_logger);
+    benchmark::RegisterBenchmark("disabled-at-runtime (global logger)", bench_global_logger,
+                                 disabled_logger);
+    // with backtrace of 64
+    auto tracing_disabled_logger =
+        std::make_shared<spdlog::logger>("bench", std::make_shared<null_sink_mt>());
+    tracing_disabled_logger->enable_backtrace(64);
+    benchmark::RegisterBenchmark("disabled-at-runtime/backtrace", bench_logger,
+                                 tracing_disabled_logger);
 
-        auto basic_st = spdlog::basic_logger_mt("basic_st", "logs/basic_st.log", true);
-        bench(howmany, basic_st);
+    auto null_logger_st =
+        std::make_shared<spdlog::logger>("bench", std::make_shared<null_sink_st>());
+    benchmark::RegisterBenchmark("null_sink_st (500_bytes c_str)", bench_c_string,
+                                 std::move(null_logger_st));
+    benchmark::RegisterBenchmark("null_sink_st", bench_logger, null_logger_st);
+    benchmark::RegisterBenchmark("null_sink_st (global logger)", bench_global_logger,
+                                 null_logger_st);
+    // with backtrace of 64
+    auto tracing_null_logger_st =
+        std::make_shared<spdlog::logger>("bench", std::make_shared<null_sink_st>());
+    tracing_null_logger_st->enable_backtrace(64);
+    benchmark::RegisterBenchmark("null_sink_st/backtrace", bench_logger, tracing_null_logger_st);
 
-        auto rotating_st = spdlog::rotating_logger_st("rotating_st", "logs/rotating_st.log", file_size, rotating_files);
-        bench(howmany, rotating_st);
+#ifdef __linux__
+    bench_dev_null();
+#endif  // __linux__
 
-        auto daily_st = spdlog::daily_logger_st("daily_st", "logs/daily_st.log");
-        bench(howmany, daily_st);
+    if (full_bench) {
+        // basic_st
+        auto basic_st = spdlog::basic_logger_st("basic_st", "latency_logs/basic_st.log", true);
+        benchmark::RegisterBenchmark("basic_st", bench_logger, std::move(basic_st))->UseRealTime();
+        spdlog::drop("basic_st");
+        // with backtrace of 64
+        auto tracing_basic_st =
+            spdlog::basic_logger_st("tracing_basic_st", "latency_logs/tracing_basic_st.log", true);
+        tracing_basic_st->enable_backtrace(64);
+        benchmark::RegisterBenchmark("basic_st/backtrace", bench_logger,
+                                     std::move(tracing_basic_st))
+            ->UseRealTime();
+        spdlog::drop("tracing_basic_st");
 
-        bench(howmany, spdlog::create<null_sink_st>("null_st"));
+        // rotating st
+        auto rotating_st = spdlog::rotating_logger_st("rotating_st", "latency_logs/rotating_st.log",
+                                                      file_size, rotating_files);
+        benchmark::RegisterBenchmark("rotating_st", bench_logger, std::move(rotating_st))
+            ->UseRealTime();
+        spdlog::drop("rotating_st");
+        // with backtrace of 64
+        auto tracing_rotating_st = spdlog::rotating_logger_st(
+            "tracing_rotating_st", "latency_logs/tracing_rotating_st.log", file_size,
+            rotating_files);
+        benchmark::RegisterBenchmark("rotating_st/backtrace", bench_logger,
+                                     std::move(tracing_rotating_st))
+            ->UseRealTime();
+        spdlog::drop("tracing_rotating_st");
 
-        cout << "\n****************************************************************"
-                "***************\n";
-        cout << threads << " threads sharing same logger\n";
-        cout << "******************************************************************"
-                "*************\n";
+        // daily st
+        auto daily_st = spdlog::daily_logger_mt("daily_st", "latency_logs/daily_st.log");
+        benchmark::RegisterBenchmark("daily_st", bench_logger, std::move(daily_st))->UseRealTime();
+        spdlog::drop("daily_st");
+        auto tracing_daily_st =
+            spdlog::daily_logger_mt("tracing_daily_st", "latency_logs/daily_st.log");
+        benchmark::RegisterBenchmark("daily_st/backtrace", bench_logger,
+                                     std::move(tracing_daily_st))
+            ->UseRealTime();
+        spdlog::drop("tracing_daily_st");
 
-        auto basic_mt = spdlog::basic_logger_mt("basic_mt", "logs/basic_mt.log", true);
-        bench_mt(howmany, basic_mt, threads);
+        //
+        // Multi threaded bench, 10 loggers using same logger concurrently
+        //
+        auto null_logger_mt =
+            std::make_shared<spdlog::logger>("bench", std::make_shared<null_sink_mt>());
+        benchmark::RegisterBenchmark("null_sink_mt", bench_logger, null_logger_mt)
+            ->Threads(n_threads)
+            ->UseRealTime();
 
-        auto rotating_mt = spdlog::rotating_logger_mt("rotating_mt", "logs/rotating_mt.log", file_size, rotating_files);
-        bench_mt(howmany, rotating_mt, threads);
+        // basic_mt
+        auto basic_mt = spdlog::basic_logger_mt("basic_mt", "latency_logs/basic_mt.log", true);
+        benchmark::RegisterBenchmark("basic_mt", bench_logger, std::move(basic_mt))
+            ->Threads(n_threads)
+            ->UseRealTime();
+        spdlog::drop("basic_mt");
 
-        auto daily_mt = spdlog::daily_logger_mt("daily_mt", "logs/daily_mt.log");
-        bench_mt(howmany, daily_mt, threads);
-        bench(howmany, spdlog::create<null_sink_st>("null_mt"));
+        // rotating mt
+        auto rotating_mt = spdlog::rotating_logger_mt("rotating_mt", "latency_logs/rotating_mt.log",
+                                                      file_size, rotating_files);
+        benchmark::RegisterBenchmark("rotating_mt", bench_logger, std::move(rotating_mt))
+            ->Threads(n_threads)
+            ->UseRealTime();
+        spdlog::drop("rotating_mt");
 
-        cout << "\n****************************************************************"
-                "***************\n";
-        cout << "async logging.. " << threads << " threads sharing same logger\n";
-        cout << "******************************************************************"
-                "*************\n";
-
-        for (int i = 0; i < 3; ++i)
-        {
-            spdlog::init_thread_pool(static_cast<size_t>(queue_size), 1);
-            auto as = spdlog::basic_logger_mt<spdlog::async_factory>("async", "logs/basic_async.log", true);
-            bench_mt(howmany, as, threads);
-            spdlog::drop("async");
-        }
+        // daily mt
+        auto daily_mt = spdlog::daily_logger_mt("daily_mt", "latency_logs/daily_mt.log");
+        benchmark::RegisterBenchmark("daily_mt", bench_logger, std::move(daily_mt))
+            ->Threads(n_threads)
+            ->UseRealTime();
+        spdlog::drop("daily_mt");
     }
-    catch (std::exception &ex)
-    {
-        std::cerr << "Error: " << ex.what() << std::endl;
-        perror("Last error");
-        return EXIT_FAILURE;
-    }
-    return EXIT_SUCCESS;
-}
-
-void bench(int howmany, std::shared_ptr<spdlog::logger> log)
-{
-    using namespace std::chrono;
-    using chrono::high_resolution_clock;
-    using chrono::milliseconds;
-    using chrono::nanoseconds;
-
-    cout << log->name() << "...\t\t" << flush;
-    nanoseconds total_nanos = nanoseconds::zero();
-    for (auto i = 0; i < howmany; ++i)
-    {
-        auto start = high_resolution_clock::now();
-        log->info("Hello logger: msg number {}", i);
-        auto delta_nanos = chrono::duration_cast<nanoseconds>(high_resolution_clock::now() - start);
-        total_nanos += delta_nanos;
-    }
-
-    auto avg = total_nanos.count() / howmany;
-    cout << format(avg) << " ns/call" << endl;
-}
-
-void bench_mt(int howmany, std::shared_ptr<spdlog::logger> log, int thread_count)
-{
-    using namespace std::chrono;
-    using chrono::high_resolution_clock;
-    using chrono::milliseconds;
-    using chrono::nanoseconds;
-
-    cout << log->name() << "...\t\t" << flush;
-    vector<thread> threads;
-    std::atomic<nanoseconds::rep> total_nanos{0};
-    for (int t = 0; t < thread_count; ++t)
-    {
-        threads.push_back(std::thread([&]() {
-            for (int j = 0; j < howmany / thread_count; j++)
-            {
-                auto start = high_resolution_clock::now();
-                log->info("Hello logger: msg number {}", j);
-                auto delta_nanos = chrono::duration_cast<nanoseconds>(high_resolution_clock::now() - start);
-                total_nanos += delta_nanos.count();
-            }
-        }));
-    }
-
-    for (auto &t : threads)
-    {
-        t.join();
-    };
-
-    auto avg = total_nanos / howmany;
-    cout << format(avg) << " ns/call" << endl;
+
+    // async
+    auto queue_size = 1024 * 1024 * 3;
+    auto tp = std::make_shared<spdlog::details::thread_pool>(queue_size, 1);
+    auto async_logger = std::make_shared<spdlog::async_logger>(
+        "async_logger", std::make_shared<null_sink_mt>(), std::move(tp),
+        spdlog::async_overflow_policy::overrun_oldest);
+    benchmark::RegisterBenchmark("async_logger", bench_logger, async_logger)
+        ->Threads(n_threads)
+        ->UseRealTime();
+
+    auto async_logger_tracing = std::make_shared<spdlog::async_logger>(
+        "async_logger_tracing", std::make_shared<null_sink_mt>(), std::move(tp),
+        spdlog::async_overflow_policy::overrun_oldest);
+    async_logger_tracing->enable_backtrace(32);
+    benchmark::RegisterBenchmark("async_logger/tracing", bench_logger, async_logger_tracing)
+        ->Threads(n_threads)
+        ->UseRealTime();
+
+    benchmark::Initialize(&argc, argv);
+    benchmark::RunSpecifiedBenchmarks();
 }

bench/logs/.gitignore

@@ -1,4 +0,0 @@
-# Ignore everything in this directory
-*
-# Except this file
-!.gitignore

bench/mem

@@ -1,19 +0,0 @@
-#!/bin/sh
-
-if [ $# -lt 1 ]; then
-  echo "usage: $0 <program>"
-fi
-
-PROG=$1
-
-if [ ! -x "$PROG" ]; then
-  echo $PROG not found or not executable.
-  exit 1
-fi
-
-$* &
-PID=$!
-
-while `kill -0 $PID 2>/dev/null`; do
-  ps -eo size,pid,user,pcpu,command --sort -size | awk '{ line=1 ; hr=$1/1024 ; printf("%13.2f Mb ",hr); } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }' | grep -v grep | grep -v $0 | grep $PROG
-done

bench/spdlog-async.cpp

@@ -1,77 +0,0 @@
-//
-// Copyright(c) 2015 Gabi Melman.
-// Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
-
-#include <atomic>
-#include <chrono>
-#include <cstdlib>
-#include <iostream>
-#include <thread>
-#include <vector>
-
-#include "spdlog/async.h"
-#include "spdlog/sinks/basic_file_sink.h"
-
-using namespace std;
-
-int main(int argc, char *argv[])
-{
-    using namespace std::chrono;
-    using clock = steady_clock;
-
-    int thread_count = 10;
-    if (argc > 1)
-        thread_count = std::atoi(argv[1]);
-
-    int howmany = 1000000;
-    spdlog::init_thread_pool(howmany, 1);
-
-    auto logger = spdlog::create_async_logger<spdlog::sinks::basic_file_sink_mt>("file_logger", "logs/spdlog-bench-async.log", false);
-    logger->set_pattern("[%Y-%m-%d %T.%F]: %L %t %v");
-
-    std::cout << "To stop, press <Enter>" << std::endl;
-    std::atomic<bool> run{true};
-    std::thread stoper(std::thread([&run]() {
-        std::cin.get();
-        run = false;
-    }));
-
-    while (run)
-    {
-        std::atomic<int> msg_counter{0};
-        std::vector<std::thread> threads;
-
-        auto start = clock::now();
-        for (int t = 0; t < thread_count; ++t)
-        {
-            threads.push_back(std::thread([&]() {
-                while (true)
-                {
-                    int counter = ++msg_counter;
-                    if (counter > howmany)
-                        break;
-                    logger->info("spdlog message #{}: This is some text for your pleasure", counter);
-                }
-            }));
-        }
-
-        for (auto &t : threads)
-        {
-            t.join();
-        }
-
-        duration<float> delta = clock::now() - start;
-        float deltaf = delta.count();
-        auto rate = howmany / deltaf;
-
-        std::cout << "Total: " << howmany << std::endl;
-        std::cout << "Threads: " << thread_count << std::endl;
-        std::cout << "Delta = " << std::fixed << deltaf << " seconds" << std::endl;
-        std::cout << "Rate = " << std::fixed << rate << "/sec" << std::endl;
-    } // while
-
-    stoper.join();
-
-    return 0;
-}

bench/utils.h

@@ -11,9 +11,8 @@
 
 namespace utils {
 
-template<typename T>
-inline std::string format(const T &value)
-{
+template <typename T>
+inline std::string format(const T &value) {
     static std::locale loc("");
     std::stringstream ss;
     ss.imbue(loc);
@@ -21,9 +20,8 @@ inline std::string format(const T &value)
     return ss.str();
 }
 
-template<>
-inline std::string format(const double &value)
-{
+template <>
+inline std::string format(const double &value) {
     static std::locale loc("");
     std::stringstream ss;
     ss.imbue(loc);
@@ -31,4 +29,4 @@ inline std::string format(const double &value)
     return ss.str();
 }
 
-} // namespace utils
+}  // namespace utils

clang_tidy.sh

@@ -1,2 +0,0 @@
-#!/bin/bash
-clang-tidy example/example.cpp -- -I ./include 

cmake/Config.cmake.in

@@ -1,24 +0,0 @@
-# *************************************************************************/
-# * Copyright (c) 2015 Ruslan Baratov.                                    */
-# *                                                                       */
-# * Permission is hereby granted, free of charge, to any person obtaining */
-# * a copy of this software and associated documentation files (the       */
-# * "Software"), to deal in the Software without restriction, including   */
-# * without limitation the rights to use, copy, modify, merge, publish,   */
-# * distribute, sublicense, and/or sell copies of the Software, and to    */
-# * permit persons to whom the Software is furnished to do so, subject to */
-# * the following conditions:                                             */
-# *                                                                       */
-# * The above copyright notice and this permission notice shall be        */
-# * included in all copies or substantial portions of the Software.       */
-# *                                                                       */
-# * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-# * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-# * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-# * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-# * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-# * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-# * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-# *************************************************************************/
-
-include("${CMAKE_CURRENT_LIST_DIR}/@targets_export_name@.cmake")

cmake/ide.cmake

@@ -0,0 +1,18 @@
+# ---------------------------------------------------------------------------------------
+# IDE support for headers
+# ---------------------------------------------------------------------------------------
+set(SPDLOG_HEADERS_DIR "${CMAKE_CURRENT_LIST_DIR}/../include")
+
+file(GLOB SPDLOG_TOP_HEADERS "${SPDLOG_HEADERS_DIR}/spdlog/*.h")
+file(GLOB SPDLOG_DETAILS_HEADERS "${SPDLOG_HEADERS_DIR}/spdlog/details/*.h")
+file(GLOB SPDLOG_SINKS_HEADERS "${SPDLOG_HEADERS_DIR}/spdlog/sinks/*.h")
+file(GLOB SPDLOG_FMT_HEADERS "${SPDLOG_HEADERS_DIR}/spdlog/fmt/*.h")
+file(GLOB SPDLOG_FMT_BUNDELED_HEADERS "${SPDLOG_HEADERS_DIR}/spdlog/fmt/bundled/*.h")
+set(SPDLOG_ALL_HEADERS ${SPDLOG_TOP_HEADERS} ${SPDLOG_DETAILS_HEADERS} ${SPDLOG_SINKS_HEADERS} ${SPDLOG_FMT_HEADERS}
+                       ${SPDLOG_FMT_BUNDELED_HEADERS})
+
+source_group("Header Files\\spdlog" FILES ${SPDLOG_TOP_HEADERS})
+source_group("Header Files\\spdlog\\details" FILES ${SPDLOG_DETAILS_HEADERS})
+source_group("Header Files\\spdlog\\sinks" FILES ${SPDLOG_SINKS_HEADERS})
+source_group("Header Files\\spdlog\\fmt" FILES ${SPDLOG_FMT_HEADERS})
+source_group("Header Files\\spdlog\\fmt\\bundled\\" FILES ${SPDLOG_FMT_BUNDELED_HEADERS})

cmake/pch.h.in

@@ -0,0 +1,258 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// details/pattern_formatter-inl.h
+// fmt/bin_to_hex.h
+// fmt/bundled/format-inl.h
+#include <cctype>
+
+// details/file_helper-inl.h
+// details/os-inl.h
+// fmt/bundled/core.h
+// fmt/bundled/posix.h
+// logger-inl.h
+// sinks/daily_file_sink.h
+// sinks/stdout_sinks.h
+#include <cstdio>
+
+// details/os-inl.h
+// fmt/bundled/posix.h
+#include <cstdlib>
+
+// details/os-inl.h
+// details/pattern_formatter-inl.h
+// fmt/bundled/core.h
+// fmt/bundled/format-inl.h
+#include <cstring>
+
+// details/os-inl.h
+// details/os.h
+// details/pattern_formatter-inl.h
+// details/pattern_formatter.h
+// fmt/bundled/chrono.h
+// sinks/daily_file_sink.h
+// sinks/rotating_file_sink-inl.h
+#include <ctime>
+
+// fmt/bundled/format-inl.h
+#include <climits>
+
+// fmt/bundled/format-inl.h
+#include <cwchar>
+
+// fmt/bundled/format-inl.h
+// fmt/bundled/format.h
+#include <cmath>
+
+// fmt/bundled/format-inl.h
+#include <cstdarg>
+
+// details/file_helper-inl.h
+// fmt/bundled/format.h
+// fmt/bundled/posix.h
+// sinks/rotating_file_sink-inl.h
+#include <cerrno>
+
+// details/circular_q.h
+// details/thread_pool-inl.h
+// fmt/bundled/format-inl.h
+#include <cassert>
+
+// async_logger-inl.h
+// cfg/helpers-inl.h
+// log_levels.h
+// common.h
+// details/file_helper-inl.h
+// details/log_msg.h
+// details/os-inl.h
+// details/pattern_formatter-inl.h
+// details/pattern_formatter.h
+// details/registry-inl.h
+// details/registry.h
+// details/tcp_client-windows.h
+// details/tcp_client.h
+// fmt/bundled/core.h
+// sinks/android_sink.h
+// sinks/ansicolor_sink.h
+// sinks/basic_file_sink.h
+// sinks/daily_file_sink.h
+// sinks/dup_filter_sink.h
+// sinks/msvc_sink.h
+// sinks/ringbuffer_sink.h
+// sinks/rotating_file_sink-inl.h
+// sinks/rotating_file_sink.h
+// sinks/syslog_sink.h
+// sinks/tcp_sink.h
+// sinks/win_eventlog_sink.h
+// sinks/wincolor_sink.h
+// spdlog.h:
+#include <string>
+
+// cfg/helpers-inl.h
+// fmt/bundled/chrono.h
+#include <sstream>
+
+// fmt/bundled/ostream.h
+// sinks/ostream_sink.h
+#include <ostream>
+
+// cfg/log_levels.h
+// details/registry-inl.h
+// details/registry.h
+#include <unordered_map>
+
+// details/circular_q.h
+// details/pattern_formatter-inl.h
+// details/pattern_formatter.h
+// details/thread_pool.h
+// fmt/bundled/compile.h
+// logger.h
+// sinks/dist_sink.h
+// sinks/ringbuffer_sink.h
+// sinks/win_eventlog_sink.h
+#include <vector>
+
+// details/os-inl.h
+// details/pattern_formatter-inl.h
+// sinks/ansicolor_sink.h
+// sinks/syslog_sink.h
+// sinks/systemd_sink.h
+// sinks/wincolor_sink.h
+#include <array>
+
+// details/file_helper-inl.h
+// details/file_helper.h
+// sinks/rotating_file_sink-inl.h
+#include <tuple>
+
+// details/os-inl.h
+// fmt/bundled/format.h
+// fmt/bundled/printf.h
+#include <limits>
+
+// common.h
+// details/backtracer.h
+// details/null_mutex.h
+#include <atomic>
+
+// common.h
+// details/backtracer.h
+// details/null_mutex.h
+#include <locale>
+
+// common.h
+#include <initializer_list>
+
+// common.h
+#include <exception>
+
+// common.h
+// details/fmt_helper.h
+// fmt/bundled/core.h
+// fmt/bundled/ranges.h
+#include <type_traits>
+
+// cfg/helpers-inl.h
+// details/null_mutex.h
+// details/pattern_formatter-inl.h
+#include <utility>
+
+// async.h
+// async_logger-inl.h
+// common.h
+// details/pattern_formatter-inl.h
+// details/pattern_formatter.h
+// details/registry-inl.h
+// details/registry.h
+// details/thread_pool.h
+// fmt/bundled/format.h
+// sinks/ansicolor_sink.h
+// sinks/base_sink-inl.h
+// sinks/dist_sink.h
+// sinks/stdout_sinks-inl.h
+// sinks/wincolor_sink.h
+// spdlog.h
+#include <memory>
+
+// async.h
+// common.h
+// details/backtracer.h
+// details/periodic_worker.h
+// details/registry-inl.h
+// details/registry.h
+// details/thread_pool.h
+// sinks/tcp_sink.h
+// spdlog.h
+#include <functional>
+
+// details/mpmc_blocking_q.h
+// details/periodic_worker.h
+#include <condition_variable>
+
+// details/os-inl.h
+// fmt/bundled/format.h
+// fmt/bundled/printf.h
+// sinks/dist_sink.h
+#include <algorithm>
+
+// common.h
+// details/file_helper-inl.h
+// details/fmt_helper.h
+// details/os-inl.h
+// details/pattern_formatter-inl.h
+// details/pattern_formatter.h
+// details/periodic_worker.h
+// details/registry-inl.h
+// details/registry.h
+// details/thread_pool.h
+// fmt/bundled/chrono.h
+// sinks/android_sink.h
+// sinks/daily_file_sink.h
+// sinks/dup_filter_sink.h
+// sinks/rotating_file_sink-inl.h
+// sinks/rotating_file_sink.h
+// sinks/tcp_sink.h
+// spdlog.h
+#include <chrono>
+
+// details/file_helper-inl.h
+// details/os-inl.h
+// details/pattern_formatter-inl.h
+// details/periodic_worker.h
+// details/thread_pool.h
+// sinks/android_sink.h
+#include <thread>
+
+// async.h
+// details/backtracer.h
+// details/console_globals.h
+// details/mpmc_blocking_q.h
+// details/pattern_formatter-inl.h
+// details/periodic_worker.h
+// details/registry.h
+// sinks/android_sink.h
+// sinks/ansicolor_sink.h
+// sinks/basic_file_sink.h
+// sinks/daily_file_sink.h
+// sinks/dist_sink.h
+// sinks/dup_filter_sink.h
+// sinks/msvc_sink.h
+// sinks/null_sink.h
+// sinks/ostream_sink.h
+// sinks/ringbuffer_sink.h
+// sinks/rotating_file_sink-inl.h
+// sinks/rotating_file_sink.h
+// sinks/tcp_sink.h
+// sinks/win_eventlog_sink.h
+// sinks/wincolor_sink.h
+//
+// color_sinks.cpp
+// file_sinks.cpp
+// spdlog.cpp
+// stdout_sinks.cpp
+#include <mutex>
+
+// spdlog
+#include <spdlog/common.h>

cmake/sanitizers.cmake

@@ -1,21 +0,0 @@
-if(SPDLOG_SANITIZE_THREAD AND SPDLOG_SANITIZE_ADDRESS)
-    message(FATAL_ERROR "AddressSanitizer is not compatible with ThreadSanitizer.")
-endif()
-
-if(SPDLOG_SANITIZE_ADDRESS)
-    message(STATUS "AddressSanitizer enabled")
-    set(SANITIZER_FLAGS "-fsanitize=address,undefined")
-    add_compile_options("-fno-sanitize=signed-integer-overflow")
-endif()
-
-if(SPDLOG_SANITIZE_THREAD)
-    message(STATUS "ThreadSanitizer enabled")
-    set(SANITIZER_FLAGS "-fsanitize=thread")
-endif()
-
-if(SPDLOG_SANITIZE_THREAD OR SPDLOG_SANITIZE_ADDRESS)
-    add_compile_options(${SANITIZER_FLAGS})
-    add_compile_options("-fno-sanitize-recover=all")
-    add_compile_options("-fno-omit-frame-pointer")
-    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${SANITIZER_FLAGS} -fuse-ld=gold")
-endif()

cmake/spdlog.pc.in

@@ -1,6 +1,13 @@
-prefix=@CMAKE_INSTALL_PREFIX@
-includedir=${prefix}/include
-
-Name: @PROJECT_NAME@
-Description: Super fast C++ logging library. 
-Version: @PROJECT_VERSION@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+includedir=@PKG_CONFIG_INCLUDEDIR@
+libdir=@PKG_CONFIG_LIBDIR@
+
+Name: lib@PROJECT_NAME@
+Description: Fast C++ logging library.
+URL: https://github.com/gabime/@PROJECT_NAME@
+Version: @SPDLOG_VERSION@
+CFlags: -I${includedir} @PKG_CONFIG_DEFINES@
+Libs: -L${libdir} -lspdlog -pthread
+Requires: @PKG_CONFIG_REQUIRES@
+

cmake/spdlogCPack.cmake

@@ -0,0 +1,60 @@
+set(CPACK_GENERATOR "TGZ;ZIP" CACHE STRING "Semicolon separated list of generators")
+
+set(CPACK_INCLUDE_TOPLEVEL_DIRECTORY 0)
+set(CPACK_INSTALL_CMAKE_PROJECTS "${CMAKE_BINARY_DIR}" "${PROJECT_NAME}" ALL .)
+
+set(CPACK_PROJECT_URL "https://github.com/gabime/spdlog")
+set(CPACK_PACKAGE_VENDOR "Gabi Melman")
+set(CPACK_PACKAGE_CONTACT "Gabi Melman <gmelman1@gmail.com>")
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Fast C++ logging library")
+set(CPACK_PACKAGE_VERSION_MAJOR ${PROJECT_VERSION_MAJOR})
+set(CPACK_PACKAGE_VERSION_MINOR ${PROJECT_VERSION_MINOR})
+set(CPACK_PACKAGE_VERSION_PATCH ${PROJECT_VERSION_PATCH})
+set(CPACK_PACKAGE_VERSION ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH})
+if(PROJECT_VERSION_TWEAK)
+    set(CPACK_PACKAGE_VERSION ${CPACK_PACKAGE_VERSION}.${PROJECT_VERSION_TWEAK})
+endif()
+set(CPACK_PACKAGE_RELOCATABLE ON CACHE BOOL "Build relocatable package")
+
+set(CPACK_RPM_PACKAGE_LICENSE "MIT")
+set(CPACK_RPM_PACKAGE_GROUP "Development/Libraries")
+set(CPACK_DEBIAN_PACKAGE_SECTION "libs")
+set(CPACK_RPM_PACKAGE_URL ${CPACK_PROJECT_URL})
+set(CPACK_DEBIAN_PACKAGE_HOMEPAGE ${CPACK_PROJECT_URL})
+set(CPACK_RPM_PACKAGE_DESCRIPTION "Very fast, header-only/compiled, C++ logging library.")
+set(CPACK_DEBIAN_PACKAGE_DESCRIPTION "Very fast, header-only/compiled, C++ logging library.")
+
+if(CPACK_PACKAGE_NAME)
+    set(CPACK_RPM_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
+    set(CPACK_DEBIAN_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
+else()
+    set(CPACK_RPM_FILE_NAME "${PROJECT_NAME}-${CPACK_PACKAGE_VERSION}")
+    set(CPACK_DEBIAN_FILE_NAME "${PROJECT_NAME}-${CPACK_PACKAGE_VERSION}")
+    set(CPACK_RPM_PACKAGE_NAME "${PROJECT_NAME}")
+    set(CPACK_DEBIAN_PACKAGE_NAME "${PROJECT_NAME}")
+endif()
+
+if(CPACK_RPM_PACKAGE_RELEASE)
+    set(CPACK_RPM_FILE_NAME "${CPACK_RPM_FILE_NAME}-${CPACK_RPM_PACKAGE_RELEASE}")
+endif()
+if(CPACK_DEBIAN_PACKAGE_RELEASE)
+    set(CPACK_DEBIAN_FILE_NAME "${CPACK_DEBIAN_FILE_NAME}-${CPACK_DEBIAN_PACKAGE_RELEASE}")
+endif()
+
+if(CPACK_RPM_PACKAGE_ARCHITECTURE)
+    set(CPACK_RPM_FILE_NAME "${CPACK_RPM_FILE_NAME}.${CPACK_RPM_PACKAGE_ARCHITECTURE}")
+endif()
+if(CPACK_DEBIAN_PACKAGE_ARCHITECTURE)
+    set(CPACK_DEBIAN_FILE_NAME "${CPACK_DEBIAN_FILE_NAME}.${CPACK_DEBIAN_PACKAGE_ARCHITECTURE}")
+endif()
+set(CPACK_RPM_FILE_NAME "${CPACK_RPM_FILE_NAME}.rpm")
+set(CPACK_DEBIAN_FILE_NAME "${CPACK_DEBIAN_FILE_NAME}.deb")
+
+if(NOT CPACK_PACKAGE_RELOCATABLE)
+    # Depend on pkgconfig rpm to create the system pkgconfig folder
+    set(CPACK_RPM_PACKAGE_REQUIRES pkgconfig)
+    set(CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST_ADDITION
+        "${CPACK_PACKAGING_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/pkgconfig")
+endif()
+
+include(CPack)

cmake/spdlogConfig.cmake.in

@@ -0,0 +1,20 @@
+# Copyright(c) 2019 spdlog authors
+# Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+@PACKAGE_INIT@
+
+find_package(Threads REQUIRED)
+
+set(SPDLOG_FMT_EXTERNAL @SPDLOG_FMT_EXTERNAL@)
+set(SPDLOG_FMT_EXTERNAL_HO @SPDLOG_FMT_EXTERNAL_HO@)
+set(config_targets_file @config_targets_file@)
+
+if(SPDLOG_FMT_EXTERNAL OR SPDLOG_FMT_EXTERNAL_HO)
+    include(CMakeFindDependencyMacro)
+    find_dependency(fmt CONFIG)
+endif()
+
+
+include("${CMAKE_CURRENT_LIST_DIR}/${config_targets_file}")
+
+check_required_components(spdlog)

cmake/utils.cmake

@@ -0,0 +1,73 @@
+# Get spdlog version from include/spdlog/version.h and put it in SPDLOG_VERSION
+function(spdlog_extract_version)
+    file(READ "${CMAKE_CURRENT_LIST_DIR}/include/spdlog/version.h" file_contents)
+    string(REGEX MATCH "SPDLOG_VER_MAJOR ([0-9]+)" _ "${file_contents}")
+    if(NOT CMAKE_MATCH_COUNT EQUAL 1)
+        message(FATAL_ERROR "Could not extract major version number from spdlog/version.h")
+    endif()
+    set(ver_major ${CMAKE_MATCH_1})
+
+    string(REGEX MATCH "SPDLOG_VER_MINOR ([0-9]+)" _ "${file_contents}")
+    if(NOT CMAKE_MATCH_COUNT EQUAL 1)
+        message(FATAL_ERROR "Could not extract minor version number from spdlog/version.h")
+    endif()
+
+    set(ver_minor ${CMAKE_MATCH_1})
+    string(REGEX MATCH "SPDLOG_VER_PATCH ([0-9]+)" _ "${file_contents}")
+    if(NOT CMAKE_MATCH_COUNT EQUAL 1)
+        message(FATAL_ERROR "Could not extract patch version number from spdlog/version.h")
+    endif()
+    set(ver_patch ${CMAKE_MATCH_1})
+
+    set(SPDLOG_VERSION_MAJOR ${ver_major} PARENT_SCOPE)
+    set(SPDLOG_VERSION_MINOR ${ver_minor} PARENT_SCOPE)
+    set(SPDLOG_VERSION_PATCH ${ver_patch} PARENT_SCOPE)
+    set(SPDLOG_VERSION "${ver_major}.${ver_minor}.${ver_patch}" PARENT_SCOPE)
+endfunction()
+
+# Turn on warnings on the given target
+function(spdlog_enable_warnings target_name)
+    if(SPDLOG_BUILD_WARNINGS)
+        if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+            list(APPEND MSVC_OPTIONS "/W3")
+            if(MSVC_VERSION GREATER 1900) # Allow non fatal security warnings for msvc 2015
+                list(APPEND MSVC_OPTIONS "/WX")
+            endif()
+        endif()
+
+        target_compile_options(
+            ${target_name}
+            PRIVATE $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>,$<CXX_COMPILER_ID:GNU>>:
+                    -Wall
+                    -Wextra
+                    -Wconversion
+                    -pedantic
+                    -Werror
+                    -Wfatal-errors>
+                    $<$<CXX_COMPILER_ID:MSVC>:${MSVC_OPTIONS}>)
+    endif()
+endfunction()
+
+# Enable address sanitizer (gcc/clang only)
+function(spdlog_enable_addr_sanitizer target_name)
+    if(NOT CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+        message(FATAL_ERROR "Sanitizer supported only for gcc/clang")
+    endif()
+    message(STATUS "Address sanitizer enabled")
+    target_compile_options(${target_name} PRIVATE -fsanitize=address,undefined)
+    target_compile_options(${target_name} PRIVATE -fno-sanitize=signed-integer-overflow)
+    target_compile_options(${target_name} PRIVATE -fno-sanitize-recover=all)
+    target_compile_options(${target_name} PRIVATE -fno-omit-frame-pointer)
+    target_link_libraries(${target_name} PRIVATE -fsanitize=address,undefined)
+endfunction()
+
+# Enable thread sanitizer (gcc/clang only)
+function(spdlog_enable_thread_sanitizer target_name)
+    if(NOT CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+        message(FATAL_ERROR "Sanitizer supported only for gcc/clang")
+    endif()
+    message(STATUS "Thread sanitizer enabled")
+    target_compile_options(${target_name} PRIVATE -fsanitize=thread)
+    target_compile_options(${target_name} PRIVATE -fno-omit-frame-pointer)
+    target_link_libraries(${target_name} PRIVATE -fsanitize=thread)
+endfunction()

cmake/version.rc.in

@@ -0,0 +1,42 @@
+#define APSTUDIO_READONLY_SYMBOLS
+#include <windows.h>
+#undef APSTUDIO_READONLY_SYMBOLS
+
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+
+VS_VERSION_INFO VERSIONINFO
+ FILEVERSION @SPDLOG_VERSION_MAJOR@,@SPDLOG_VERSION_MINOR@,@SPDLOG_VERSION_PATCH@,0
+ PRODUCTVERSION @SPDLOG_VERSION_MAJOR@,@SPDLOG_VERSION_MINOR@,@SPDLOG_VERSION_PATCH@,0
+ FILEFLAGSMASK 0x3fL
+#ifdef _DEBUG
+ FILEFLAGS 0x1L
+#else
+ FILEFLAGS 0x0L
+#endif
+ FILEOS 0x40004L
+ FILETYPE 0x2L
+ FILESUBTYPE 0x0L
+BEGIN
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "040904b0"
+        BEGIN
+            VALUE "FileDescription", "spdlog dll\0"
+            VALUE "FileVersion", "@SPDLOG_VERSION@.0\0"
+            VALUE "InternalName", "spdlog.dll\0"
+            VALUE "LegalCopyright", "Copyright (C) spdlog\0"
+            VALUE "ProductName", "spdlog\0"
+            VALUE "ProductVersion", "@SPDLOG_VERSION@.0\0"
+        END
+    END
+    BLOCK "VarFileInfo"
+    BEGIN
+        VALUE "Translation", 0x409, 1200
+    END
+END
+
+
+
+
+

example/CMakeLists.txt

@@ -1,43 +1,23 @@
-# *************************************************************************/
-# * Copyright (c) 2015 Ruslan Baratov.                                    */
-# *                                                                       */
-# * Permission is hereby granted, free of charge, to any person obtaining */
-# * a copy of this software and associated documentation files (the       */
-# * "Software"), to deal in the Software without restriction, including   */
-# * without limitation the rights to use, copy, modify, merge, publish,   */
-# * distribute, sublicense, and/or sell copies of the Software, and to    */
-# * permit persons to whom the Software is furnished to do so, subject to */
-# * the following conditions:                                             */
-# *                                                                       */
-# * The above copyright notice and this permission notice shall be        */
-# * included in all copies or substantial portions of the Software.       */
-# *                                                                       */
-# * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-# * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-# * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-# * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-# * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-# * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-# * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-# *************************************************************************/
+# Copyright(c) 2019 spdlog authors Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
-cmake_minimum_required(VERSION 3.1)
-project(SpdlogExamples CXX)
+cmake_minimum_required(VERSION 3.11)
+project(spdlog_examples CXX)
 
 if(NOT TARGET spdlog)
-  # Stand-alone build
-  find_package(spdlog CONFIG REQUIRED)
+    # Stand-alone build
+    find_package(spdlog REQUIRED)
 endif()
 
-find_package(Threads REQUIRED)
-
+# ---------------------------------------------------------------------------------------
+# Example of using pre-compiled library
+# ---------------------------------------------------------------------------------------
 add_executable(example example.cpp)
-target_link_libraries(example spdlog::spdlog Threads::Threads)
+target_link_libraries(example PRIVATE spdlog::spdlog $<$<BOOL:${MINGW}>:ws2_32>)
 
-add_executable(multisink multisink.cpp)
-target_link_libraries(multisink spdlog::spdlog Threads::Threads)
-
-file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/logs")
-
-enable_testing()
-add_test(NAME example COMMAND example)
+# ---------------------------------------------------------------------------------------
+# Example of using header-only library
+# ---------------------------------------------------------------------------------------
+if(SPDLOG_BUILD_EXAMPLE_HO)
+    add_executable(example_header_only example.cpp)
+    target_link_libraries(example_header_only PRIVATE spdlog::spdlog_header_only)
+endif()

example/Makefile

@@ -1,21 +0,0 @@
-CXX	?= g++
-CXX_FLAGS = -Wall -Wextra -pedantic -std=c++11 -pthread -I../include -fmax-errors=1 -Wconversion
-CXX_RELEASE_FLAGS = -O3 -march=native
-CXX_DEBUG_FLAGS= -g
-
-all:	example 
-debug:	example-debug
-
-example: example.cpp
-	$(CXX) example.cpp -o example $(CXX_FLAGS) $(CXX_RELEASE_FLAGS) $(CXXFLAGS)
-
-
-example-debug: example.cpp
-	$(CXX) example.cpp -o example-debug $(CXX_FLAGS) $(CXX_DEBUG_FLAGS) $(CXXFLAGS)
-
-clean:
-	rm -f *.o logs/*.txt example example-debug
-
-
-rebuild: clean all
-rebuild-debug: clean debug

example/Makefile-all-warn

@@ -1,22 +0,0 @@
-#-Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-padded
-CXX	?= g++
-CXX_FLAGS = -Wall -Wextra -pedantic -std=c++11 -pthread -I../include -fmax-errors=1 -Wconversion -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-padded -Wno-weak-vtables -Wno-global-constructors
-CXX_RELEASE_FLAGS = -O3 -march=native
-CXX_DEBUG_FLAGS= -g
-
-all:	example 
-debug:	example-debug
-
-example: example.cpp
-	$(CXX) example.cpp -o example $(CXX_FLAGS) $(CXX_RELEASE_FLAGS) $(CXXFLAGS)
-
-
-example-debug: example.cpp
-	$(CXX) example.cpp -o example-debug $(CXX_FLAGS) $(CXX_DEBUG_FLAGS) $(CXXFLAGS)
-
-clean:
-	rm -f *.o logs/*.txt example example-debug
-
-
-rebuild: clean all
-rebuild-debug: clean debug

example/Makefile.clang

@@ -1,26 +0,0 @@
-CXX	= clang++
-CXXFLAGS	= -march=native -Wall -Wextra -Wshadow -pedantic -std=c++11 -pthread -I../include
-CXX_RELEASE_FLAGS = -O2
-CXX_DEBUG_FLAGS= -g 
-
-
-all:	example 
-debug: example-debug 
-
-example: example.cpp
-	$(CXX) example.cpp -o example-clang $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
-
-	
-
-example-debug: example.cpp
-	$(CXX) example.cpp -o example-clang-debug $(CXXFLAGS) $(CXX_DEBUG_FLAGS)
-
-
-clean:
-	rm -f *.o logs/*.txt example-clang example-clang-debug 
-
-
-rebuild: clean all
-rebuild-debug: clean debug
-
-

example/Makefile.mingw

@@ -1,25 +0,0 @@
-CXX	?= g++
-CXXFLAGS	=  -D_WIN32_WINNT=0x600 -march=native -Wall -Wextra -pedantic -std=gnu++0x -pthread -Wl,--no-as-needed  -I../include 
-CXX_RELEASE_FLAGS = -O3 
-CXX_DEBUG_FLAGS= -g 
-
-
-all:	example 
-debug: example-debug 
-
-example: example.cpp
-	$(CXX) example.cpp -o example $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
-
-	
-example-debug: example.cpp
-	$(CXX) example.cpp -o example-debug $(CXXFLAGS) $(CXX_DEBUG_FLAGS)
-
-
-clean:
-	rm -f *.o logs/*.txt example example-debug
-
-
-rebuild: clean all
-rebuild-debug: clean debug
-
-

example/example.cpp

@@ -1,191 +1,262 @@
 //
 // Copyright(c) 2015 Gabi Melman.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
-//
+
 // spdlog usage example
-//
-//
 
-#include <iostream>
+#include <cstdio>
+#include <chrono>
 
-void stdout_example();
+void load_levels_example();
+void stdout_logger_example();
 void basic_example();
 void rotating_example();
 void daily_example();
+void callback_example();
 void async_example();
 void binary_example();
+void vector_example();
+void stopwatch_example();
+void trace_example();
 void multi_sink_example();
 void user_defined_example();
 void err_handler_example();
 void syslog_example();
-void clone_example();
+void udp_example();
+void custom_flags_example();
+void file_events_example();
+void replace_default_logger_example();
+void mdc_example();
 
 #include "spdlog/spdlog.h"
+#include "spdlog/cfg/env.h"   // support for loading levels from the environment variable
+#include "spdlog/fmt/ostr.h"  // support for user defined types
 
-int main(int, char *[])
-{
+int main(int, char *[]) {
+    // Log levels can be loaded from argv/env using "SPDLOG_LEVEL"
+    load_levels_example();
 
-    try
-    {
-        // console logging example
-        stdout_example();
+    spdlog::info("Welcome to spdlog version {}.{}.{}  !", SPDLOG_VER_MAJOR, SPDLOG_VER_MINOR,
+                 SPDLOG_VER_PATCH);
 
-        // various file loggers
+    spdlog::warn("Easy padding in numbers like {:08d}", 12);
+    spdlog::critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42);
+    spdlog::info("Support for floats {:03.2f}", 1.23456);
+    spdlog::info("Positional args are {1} {0}..", "too", "supported");
+    spdlog::info("{:>8} aligned, {:<8} aligned", "right", "left");
+
+    // Runtime log levels
+    spdlog::set_level(spdlog::level::info);  // Set global log level to info
+    spdlog::debug("This message should not be displayed!");
+    spdlog::set_level(spdlog::level::trace);  // Set specific logger's log level
+    spdlog::debug("This message should be displayed..");
+
+    // Customize msg format for all loggers
+    spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [thread %t] %v");
+    spdlog::info("This an info message with custom format");
+    spdlog::set_pattern("%+");  // back to default format
+    spdlog::set_level(spdlog::level::info);
+
+    // Backtrace support
+    // Loggers can store in a ring buffer all messages (including debug/trace) for later inspection.
+    // When needed, call dump_backtrace() to see what happened:
+    spdlog::enable_backtrace(10);  // create ring buffer with capacity of 10  messages
+    for (int i = 0; i < 100; i++) {
+        spdlog::debug("Backtrace message {}", i);  // not logged..
+    }
+    // e.g. if some error happened:
+    spdlog::dump_backtrace();  // log them now!
+
+    try {
+        stdout_logger_example();
         basic_example();
         rotating_example();
         daily_example();
-
-        clone_example();
-
-        // async logging using a backing thread pool
+        callback_example();
         async_example();
-
-        // log binary data
         binary_example();
-
-        // a logger can have multiple targets with different formats
+        vector_example();
         multi_sink_example();
-
-        // user defined types logging by implementing operator<<
         user_defined_example();
-
-        // custom  error handler
         err_handler_example();
+        trace_example();
+        stopwatch_example();
+        udp_example();
+        custom_flags_example();
+        file_events_example();
+        replace_default_logger_example();
+        mdc_example();
 
-        // flush all *registered* loggers using a worker thread every 3 seconds.
+        // Flush all *registered* loggers using a worker thread every 3 seconds.
         // note: registered loggers *must* be thread safe for this to work correctly!
         spdlog::flush_every(std::chrono::seconds(3));
 
-        // apply some function on all registered loggers
+        // Apply some function on all registered loggers
         spdlog::apply_all([&](std::shared_ptr<spdlog::logger> l) { l->info("End of example."); });
 
-        // release any threads created by spdlog, and drop all loggers in the registry.
+        // Release all spdlog resources, and drop all loggers in the registry.
+        // This is optional (only mandatory if using windows + async log).
         spdlog::shutdown();
     }
-    // Exceptions will only be thrown upon failed logger or sink construction (not during logging)
-    catch (const spdlog::spdlog_ex &ex)
-    {
-        std::cout << "Log init failed: " << ex.what() << std::endl;
+
+    // Exceptions will only be thrown upon failed logger or sink construction (not during logging).
+    catch (const spdlog::spdlog_ex &ex) {
+        std::printf("Log initialization failed: %s\n", ex.what());
         return 1;
     }
 }
 
 #include "spdlog/sinks/stdout_color_sinks.h"
-// or #include "spdlog/sinks/stdout_sinks.h" if no colors needed
-void stdout_example()
-{
-    // create color multi threaded logger
+// or #include "spdlog/sinks/stdout_sinks.h" if no colors needed.
+void stdout_logger_example() {
+    // Create color multi threaded logger.
     auto console = spdlog::stdout_color_mt("console");
-    console->info("Welcome to spdlog version {}.{}.{} !", SPDLOG_VER_MAJOR, SPDLOG_VER_MINOR, SPDLOG_VER_PATCH);
-    console->error("Some error message with arg: {}", 1);
-
-    auto err_logger = spdlog::stderr_color_mt("stderr");
-    err_logger->error("Some error message");
-
-    // Formatting examples
-    console->warn("Easy padding in numbers like {:08d}", 12);
-    console->critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42);
-    console->info("Support for floats {:03.2f}", 1.23456);
-    console->info("Positional args are {1} {0}..", "too", "supported");
-    console->info("{:<30}", "left aligned");
-
-    spdlog::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name)");
-
-    // Runtime log levels
-    spdlog::set_level(spdlog::level::info); // Set global log level to info
-    console->debug("This message should not be displayed!");
-    console->set_level(spdlog::level::trace); // Set specific logger's log level
-    console->debug("This message should be displayed..");
-
-    // Customize msg format for all loggers
-    spdlog::set_pattern("[%H:%M:%S %z] [%n] [%^---%L---%$] [thread %t] %v");
-    console->info("This an info message with custom format");
-    spdlog::set_pattern("%+"); // back to default format
-
-    // Compile time log levels
-    // define SPDLOG_DEBUG_ON or SPDLOG_TRACE_ON
-    SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23);
-    SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23);
+    // or for stderr:
+    // auto console = spdlog::stderr_color_mt("error-logger");
 }
 
 #include "spdlog/sinks/basic_file_sink.h"
-void basic_example()
-{
-    // Create basic file logger (not rotated)
-    auto my_logger = spdlog::basic_logger_mt("basic_logger", "logs/basic-log.txt");
+void basic_example() {
+    // Create basic file logger (not rotated).
+    auto my_logger = spdlog::basic_logger_mt("file_logger", "logs/basic-log.txt", true);
 }
 
 #include "spdlog/sinks/rotating_file_sink.h"
-void rotating_example()
-{
-    // Create a file rotating logger with 5mb size max and 3 rotated files
-    auto rotating_logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
+void rotating_example() {
+    // Create a file rotating logger with 5mb size max and 3 rotated files.
+    auto rotating_logger =
+        spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
 }
 
 #include "spdlog/sinks/daily_file_sink.h"
-void daily_example()
-{
-    // Create a daily logger - a new file is created every day on 2:30am
+void daily_example() {
+    // Create a daily logger - a new file is created every day on 2:30am.
     auto daily_logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
 }
 
-// clone a logger and give it new name.
-// Useful for creating component/subsystem loggers from some "root" logger
-void clone_example()
-{
-    auto network_logger = spdlog::get("console")->clone("network");
-    network_logger->info("Logging network stuff..");
+#include "spdlog/sinks/callback_sink.h"
+void callback_example() {
+    // Create the logger
+    auto logger = spdlog::callback_logger_mt("custom_callback_logger",
+                                             [](const spdlog::details::log_msg & /*msg*/) {
+                                                 // do what you need to do with msg
+                                             });
+}
+
+#include "spdlog/cfg/env.h"
+void load_levels_example() {
+    // Set the log level to "info" and mylogger to "trace":
+    // SPDLOG_LEVEL=info,mylogger=trace && ./example
+    spdlog::cfg::load_env_levels();
+    // or specify the env variable name:
+    // MYAPP_LEVEL=info,mylogger=trace && ./example
+    // spdlog::cfg::load_env_levels("MYAPP_LEVEL");
+    // or from command line:
+    // ./example SPDLOG_LEVEL=info,mylogger=trace
+    // #include "spdlog/cfg/argv.h" // for loading levels from argv
+    // spdlog::cfg::load_argv_levels(args, argv);
 }
 
 #include "spdlog/async.h"
-void async_example()
-{
-    // default thread pool settings can be modified *before* creating the async logger:
+void async_example() {
+    // Default thread pool settings can be modified *before* creating the async logger:
     // spdlog::init_thread_pool(32768, 1); // queue with max 32k items 1 backing thread.
-    auto async_file = spdlog::basic_logger_mt<spdlog::async_factory>("async_file_logger", "logs/async_log.txt");
+    auto async_file =
+        spdlog::basic_logger_mt<spdlog::async_factory>("async_file_logger", "logs/async_log.txt");
     // alternatively:
-    // auto async_file = spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("async_file_logger", "logs/async_log.txt");
+    // auto async_file =
+    // spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("async_file_logger",
+    // "logs/async_log.txt");
 
-    for (int i = 1; i < 101; ++i)
-    {
+    for (int i = 1; i < 101; ++i) {
         async_file->info("Async message #{}", i);
     }
 }
 
-// log binary data as hex.
-// many types of std::container<char> types can be used.
-// ranges are supported too.
-// format flags:
+// Log binary data as hex.
+// Many types of std::container<char> types can be used.
+// Iterator ranges are supported too.
+// Format flags:
 // {:X} - print in uppercase.
 // {:s} - don't separate each byte with space.
 // {:p} - don't print the position on each line start.
 // {:n} - don't split the output to lines.
 
-#include "spdlog/fmt/bin_to_hex.h"
-
-void binary_example()
-{
-    auto console = spdlog::get("console");
-    std::array<char, 80> buf;
-    console->info("Binary example: {}", spdlog::to_hex(buf));
-    console->info("Another binary example:{:n}", spdlog::to_hex(std::begin(buf), std::begin(buf) + 10));
+#if !defined SPDLOG_USE_STD_FORMAT || defined(_MSC_VER)
+    #include "spdlog/fmt/bin_to_hex.h"
+void binary_example() {
+    std::vector<char> buf;
+    for (int i = 0; i < 80; i++) {
+        buf.push_back(static_cast<char>(i & 0xff));
+    }
+    spdlog::info("Binary example: {}", spdlog::to_hex(buf));
+    spdlog::info("Another binary example:{:n}",
+                 spdlog::to_hex(std::begin(buf), std::begin(buf) + 10));
     // more examples:
     // logger->info("uppercase: {:X}", spdlog::to_hex(buf));
     // logger->info("uppercase, no delimiters: {:Xs}", spdlog::to_hex(buf));
     // logger->info("uppercase, no delimiters, no position info: {:Xsp}", spdlog::to_hex(buf));
+    // logger->info("hexdump style: {:a}", spdlog::to_hex(buf));
+    // logger->info("hexdump style, 20 chars per line {:a}", spdlog::to_hex(buf, 20));
+}
+#else
+void binary_example() {
+    // not supported with std::format yet
+}
+#endif
+
+// Log a vector of numbers
+#ifndef SPDLOG_USE_STD_FORMAT
+    #include "spdlog/fmt/ranges.h"
+void vector_example() {
+    std::vector<int> vec = {1, 2, 3};
+    spdlog::info("Vector example: {}", vec);
 }
 
-// create logger with 2 targets with different log levels and formats
-// the console will show only warnings or errors, while the file will log all
+#else
+void vector_example() {}
+#endif
 
-void multi_sink_example()
-{
+// ! DSPDLOG_USE_STD_FORMAT
+
+// Compile time log levels.
+// define SPDLOG_ACTIVE_LEVEL to required level (e.g. SPDLOG_LEVEL_TRACE)
+void trace_example() {
+    // trace from default logger
+    SPDLOG_TRACE("Some trace message.. {} ,{}", 1, 3.23);
+    // debug from default logger
+    SPDLOG_DEBUG("Some debug message.. {} ,{}", 1, 3.23);
+
+    // trace from logger object
+    auto logger = spdlog::get("file_logger");
+    SPDLOG_LOGGER_TRACE(logger, "another trace message");
+}
+
+// stopwatch example
+#include "spdlog/stopwatch.h"
+#include <thread>
+void stopwatch_example() {
+    spdlog::stopwatch sw;
+    std::this_thread::sleep_for(std::chrono::milliseconds(123));
+    spdlog::info("Stopwatch: {} seconds", sw);
+}
+
+#include "spdlog/sinks/udp_sink.h"
+void udp_example() {
+    spdlog::sinks::udp_sink_config cfg("127.0.0.1", 11091);
+    auto my_logger = spdlog::udp_logger_mt("udplog", cfg);
+    my_logger->set_level(spdlog::level::debug);
+    my_logger->info("hello world");
+}
+
+// A logger with multiple sinks (stdout and file) - each with a different format and log level.
+void multi_sink_example() {
     auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
     console_sink->set_level(spdlog::level::warn);
     console_sink->set_pattern("[multi_sink_example] [%^%l%$] %v");
 
-    auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", true);
+    auto file_sink =
+        std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", true);
     file_sink->set_level(spdlog::level::trace);
 
     spdlog::logger logger("multi_sink", {console_sink, file_sink});
@@ -193,52 +264,140 @@ void multi_sink_example()
     logger.warn("this should appear in both console and file");
     logger.info("this message should not appear in the console, only in the file");
 }
-// user defined types logging by implementing operator<<
-#include "spdlog/fmt/ostr.h" // must be included
-struct my_type
-{
-    int i;
-    template<typename OStream>
-    friend OStream &operator<<(OStream &os, const my_type &c)
-    {
-        return os << "[my_type i=" << c.i << "]";
+
+// User defined types logging
+struct my_type {
+    int i = 0;
+    explicit my_type(int i)
+        : i(i) {}
+};
+
+#ifndef SPDLOG_USE_STD_FORMAT  // when using fmtlib
+template <>
+struct fmt::formatter<my_type> : fmt::formatter<std::string> {
+    auto format(my_type my, format_context &ctx) const -> decltype(ctx.out()) {
+        return fmt::format_to(ctx.out(), "[my_type i={}]", my.i);
     }
 };
 
-void user_defined_example()
-{
-    spdlog::get("console")->info("user defined type: {}", my_type{14});
-}
+#else  // when using std::format
+template <>
+struct std::formatter<my_type> : std::formatter<std::string> {
+    auto format(my_type my, format_context &ctx) const -> decltype(ctx.out()) {
+        return std::format_to(ctx.out(), "[my_type i={}]", my.i);
+    }
+};
+#endif
 
-//
-// custom error handler
-//
-void err_handler_example()
-{
+void user_defined_example() { spdlog::info("user defined type: {}", my_type(14)); }
+
+// Custom error handler. Will be triggered on log failure.
+void err_handler_example() {
     // can be set globally or per logger(logger->set_error_handler(..))
-    spdlog::set_error_handler([](const std::string &msg) { spdlog::get("console")->error("*** ERROR HANDLER EXAMPLE ***: {}", msg); });
-    spdlog::get("console")->info("some invalid message to trigger an error {}{}{}{}", 3);
+    spdlog::set_error_handler([](const std::string &msg) {
+        printf("*** Custom log error handler: %s ***\n", msg.c_str());
+    });
 }
 
 // syslog example (linux/osx/freebsd)
 #ifndef _WIN32
-#include "spdlog/sinks/syslog_sink.h"
-void syslog_example()
-{
+    #include "spdlog/sinks/syslog_sink.h"
+void syslog_example() {
     std::string ident = "spdlog-example";
     auto syslog_logger = spdlog::syslog_logger_mt("syslog", ident, LOG_PID);
     syslog_logger->warn("This is warning that will end up in syslog.");
 }
 #endif
 
-// Android example
+// Android example.
 #if defined(__ANDROID__)
-#include "spdlog/sinks/android_sink.h"
-void android_example()
-{
+    #include "spdlog/sinks/android_sink.h"
+void android_example() {
     std::string tag = "spdlog-android";
     auto android_logger = spdlog::android_logger_mt("android", tag);
     android_logger->critical("Use \"adb shell logcat\" to view this message.");
 }
-
+#endif
+
+// Log patterns can contain custom flags.
+// this will add custom flag '%*' which will be bound to a <my_formatter_flag> instance
+#include "spdlog/pattern_formatter.h"
+class my_formatter_flag : public spdlog::custom_flag_formatter {
+public:
+    void format(const spdlog::details::log_msg &,
+                const std::tm &,
+                spdlog::memory_buf_t &dest) override {
+        std::string some_txt = "custom-flag";
+        dest.append(some_txt.data(), some_txt.data() + some_txt.size());
+    }
+
+    std::unique_ptr<custom_flag_formatter> clone() const override {
+        return spdlog::details::make_unique<my_formatter_flag>();
+    }
+};
+
+void custom_flags_example() {
+    using spdlog::details::make_unique;  // for pre c++14
+    auto formatter = make_unique<spdlog::pattern_formatter>();
+    formatter->add_flag<my_formatter_flag>('*').set_pattern("[%n] [%*] [%^%l%$] %v");
+    // set the new formatter using spdlog::set_formatter(formatter) or
+    // logger->set_formatter(formatter) spdlog::set_formatter(std::move(formatter));
+}
+
+void file_events_example() {
+    // pass the spdlog::file_event_handlers to file sinks for open/close log file notifications
+    spdlog::file_event_handlers handlers;
+    handlers.before_open = [](spdlog::filename_t filename) {
+        spdlog::info("Before opening {}", filename);
+    };
+    handlers.after_open = [](spdlog::filename_t filename, std::FILE *fstream) {
+        spdlog::info("After opening {}", filename);
+        fputs("After opening\n", fstream);
+    };
+    handlers.before_close = [](spdlog::filename_t filename, std::FILE *fstream) {
+        spdlog::info("Before closing {}", filename);
+        fputs("Before closing\n", fstream);
+    };
+    handlers.after_close = [](spdlog::filename_t filename) {
+        spdlog::info("After closing {}", filename);
+    };
+    auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/events-sample.txt",
+                                                                         true, handlers);
+    spdlog::logger my_logger("some_logger", file_sink);
+    my_logger.info("Some log line");
+}
+
+void replace_default_logger_example() {
+    // store the old logger so we don't break other examples.
+    auto old_logger = spdlog::default_logger();
+
+    auto new_logger =
+        spdlog::basic_logger_mt("new_default_logger", "logs/new-default-log.txt", true);
+    spdlog::set_default_logger(new_logger);
+    spdlog::set_level(spdlog::level::info);
+    spdlog::debug("This message should not be displayed!");
+    spdlog::set_level(spdlog::level::trace);
+    spdlog::debug("This message should be displayed..");
+
+    spdlog::set_default_logger(old_logger);
+}
+
+// Mapped Diagnostic Context (MDC) is a map that stores key-value pairs (string values) in thread
+// local storage. Each thread maintains its own MDC, which loggers use to append diagnostic
+// information to log outputs. Note: it is not supported in asynchronous mode due to its reliance on
+// thread-local storage.
+
+#ifndef SPDLOG_NO_TLS
+    #include "spdlog/mdc.h"
+void mdc_example() {
+    spdlog::mdc::put("key1", "value1");
+    spdlog::mdc::put("key2", "value2");
+    // if not using the default format, you can use the %& formatter to print mdc data as well
+    spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [%&] %v");
+    spdlog::info("Some log message with context");
+}
+#else
+void mdc_example() {
+    // if TLS feature is disabled
+}
 #endif

example/example.sln

@@ -1,106 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27703.2018
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "example", "example.vcxproj", "{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "spdlog", "spdlog", "{7FC6AB76-AD88-4135-888C-0568E81475AF}"
-	ProjectSection(SolutionItems) = preProject
-		..\include\spdlog\async.h = ..\include\spdlog\async.h
-		..\include\spdlog\async_logger.h = ..\include\spdlog\async_logger.h
-		..\include\spdlog\common.h = ..\include\spdlog\common.h
-		..\include\spdlog\formatter.h = ..\include\spdlog\formatter.h
-		..\include\spdlog\logger.h = ..\include\spdlog\logger.h
-		..\include\spdlog\spdlog.h = ..\include\spdlog\spdlog.h
-		..\include\spdlog\tweakme.h = ..\include\spdlog\tweakme.h
-		..\include\spdlog\version.h = ..\include\spdlog\version.h
-	EndProjectSection
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "details", "details", "{08E93803-E650-42D9-BBB4-3C16979F850E}"
-	ProjectSection(SolutionItems) = preProject
-		..\include\spdlog\details\async_logger_impl.h = ..\include\spdlog\details\async_logger_impl.h
-		..\include\spdlog\details\circular_q.h = ..\include\spdlog\details\circular_q.h
-		..\include\spdlog\details\console_globals.h = ..\include\spdlog\details\console_globals.h
-		..\include\spdlog\details\file_helper.h = ..\include\spdlog\details\file_helper.h
-		..\include\spdlog\details\fmt_helper.h = ..\include\spdlog\details\fmt_helper.h
-		..\include\spdlog\details\log_msg.h = ..\include\spdlog\details\log_msg.h
-		..\include\spdlog\details\logger_impl.h = ..\include\spdlog\details\logger_impl.h
-		..\include\spdlog\details\mpmc_blocking_q.h = ..\include\spdlog\details\mpmc_blocking_q.h
-		..\include\spdlog\details\null_mutex.h = ..\include\spdlog\details\null_mutex.h
-		..\include\spdlog\details\os.h = ..\include\spdlog\details\os.h
-		..\include\spdlog\details\pattern_formatter.h = ..\include\spdlog\details\pattern_formatter.h
-		..\include\spdlog\details\periodic_worker.h = ..\include\spdlog\details\periodic_worker.h
-		..\include\spdlog\details\registry.h = ..\include\spdlog\details\registry.h
-		..\include\spdlog\details\spdlog_impl.h = ..\include\spdlog\details\spdlog_impl.h
-		..\include\spdlog\details\thread_pool.h = ..\include\spdlog\details\thread_pool.h
-	EndProjectSection
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "fmt", "fmt", "{82378DE1-8463-4F91-91A0-C2C40E2AEA2A}"
-	ProjectSection(SolutionItems) = preProject
-		..\include\spdlog\fmt\fmt.h = ..\include\spdlog\fmt\fmt.h
-		..\include\spdlog\fmt\ostr.h = ..\include\spdlog\fmt\ostr.h
-	EndProjectSection
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "bundled", "bundled", "{D9CA4494-80D1-48D1-A897-D3564F7B27FF}"
-	ProjectSection(SolutionItems) = preProject
-		..\include\spdlog\fmt\bundled\format.cc = ..\include\spdlog\fmt\bundled\format.cc
-		..\include\spdlog\fmt\bundled\format.h = ..\include\spdlog\fmt\bundled\format.h
-		..\include\spdlog\fmt\bundled\LICENSE.rst = ..\include\spdlog\fmt\bundled\LICENSE.rst
-		..\include\spdlog\fmt\bundled\ostream.cc = ..\include\spdlog\fmt\bundled\ostream.cc
-		..\include\spdlog\fmt\bundled\ostream.h = ..\include\spdlog\fmt\bundled\ostream.h
-		..\include\spdlog\fmt\bundled\posix.cc = ..\include\spdlog\fmt\bundled\posix.cc
-		..\include\spdlog\fmt\bundled\posix.h = ..\include\spdlog\fmt\bundled\posix.h
-		..\include\spdlog\fmt\bundled\printf.cc = ..\include\spdlog\fmt\bundled\printf.cc
-		..\include\spdlog\fmt\bundled\printf.h = ..\include\spdlog\fmt\bundled\printf.h
-		..\include\spdlog\fmt\bundled\time.h = ..\include\spdlog\fmt\bundled\time.h
-	EndProjectSection
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "sinks", "sinks", "{27D16BB9-2B81-4F61-80EC-0C7A777248E4}"
-	ProjectSection(SolutionItems) = preProject
-		..\include\spdlog\sinks\android_sink.h = ..\include\spdlog\sinks\android_sink.h
-		..\include\spdlog\sinks\ansicolor_sink.h = ..\include\spdlog\sinks\ansicolor_sink.h
-		..\include\spdlog\sinks\base_sink.h = ..\include\spdlog\sinks\base_sink.h
-		..\include\spdlog\sinks\dist_sink.h = ..\include\spdlog\sinks\dist_sink.h
-		..\include\spdlog\sinks\file_sinks.h = ..\include\spdlog\sinks\file_sinks.h
-		..\include\spdlog\sinks\msvc_sink.h = ..\include\spdlog\sinks\msvc_sink.h
-		..\include\spdlog\sinks\null_sink.h = ..\include\spdlog\sinks\null_sink.h
-		..\include\spdlog\sinks\ostream_sink.h = ..\include\spdlog\sinks\ostream_sink.h
-		..\include\spdlog\sinks\sink.h = ..\include\spdlog\sinks\sink.h
-		..\include\spdlog\sinks\stdout_color_sinks.h = ..\include\spdlog\sinks\stdout_color_sinks.h
-		..\include\spdlog\sinks\stdout_sinks.h = ..\include\spdlog\sinks\stdout_sinks.h
-		..\include\spdlog\sinks\syslog_sink.h = ..\include\spdlog\sinks\syslog_sink.h
-		..\include\spdlog\sinks\wincolor_sink.h = ..\include\spdlog\sinks\wincolor_sink.h
-		..\include\spdlog\sinks\windebug_sink.h = ..\include\spdlog\sinks\windebug_sink.h
-	EndProjectSection
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Win32 = Debug|Win32
-		Debug|x64 = Debug|x64
-		Release|Win32 = Release|Win32
-		Release|x64 = Release|x64
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}.Debug|Win32.ActiveCfg = Debug|Win32
-		{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}.Debug|Win32.Build.0 = Debug|Win32
-		{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}.Debug|x64.ActiveCfg = Debug|x64
-		{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}.Debug|x64.Build.0 = Debug|x64
-		{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}.Release|Win32.ActiveCfg = Release|Win32
-		{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}.Release|Win32.Build.0 = Release|Win32
-		{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}.Release|x64.ActiveCfg = Release|x64
-		{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}.Release|x64.Build.0 = Release|x64
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-	GlobalSection(NestedProjects) = preSolution
-		{08E93803-E650-42D9-BBB4-3C16979F850E} = {7FC6AB76-AD88-4135-888C-0568E81475AF}
-		{82378DE1-8463-4F91-91A0-C2C40E2AEA2A} = {7FC6AB76-AD88-4135-888C-0568E81475AF}
-		{D9CA4494-80D1-48D1-A897-D3564F7B27FF} = {82378DE1-8463-4F91-91A0-C2C40E2AEA2A}
-		{27D16BB9-2B81-4F61-80EC-0C7A777248E4} = {7FC6AB76-AD88-4135-888C-0568E81475AF}
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {1BF53532-C5DC-4236-B195-9E17CBE40A48}
-	EndGlobalSection
-EndGlobal

example/example.vcxproj

@@ -1,168 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <ItemGroup Label="ProjectConfigurations">
-    <ProjectConfiguration Include="Debug|Win32">
-      <Configuration>Debug</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
-  </ItemGroup>
-  <ItemGroup>
-    <ClCompile Include="example.cpp" />
-  </ItemGroup>
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>{9E5AB93A-0CCE-4BAC-9FCB-0FC9CB5EB8D2}</ProjectGuid>
-    <Keyword>Win32Proj</Keyword>
-    <RootNamespace>.</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v141</PlatformToolset>
-    <CharacterSet>Unicode</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v141</PlatformToolset>
-    <CharacterSet>Unicode</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v141</PlatformToolset>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-    <CharacterSet>Unicode</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v141</PlatformToolset>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-    <CharacterSet>Unicode</CharacterSet>
-  </PropertyGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
-  <ImportGroup Label="ExtensionSettings">
-  </ImportGroup>
-  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
-  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
-  <PropertyGroup Label="UserMacros" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <LinkIncremental>true</LinkIncremental>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
-    <LinkIncremental>true</LinkIncremental>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <LinkIncremental>false</LinkIncremental>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
-    <LinkIncremental>false</LinkIncremental>
-  </PropertyGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <ClCompile>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <AdditionalIncludeDirectories>..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PrecompiledHeaderFile />
-      <PrecompiledHeaderOutputFile />
-    </ClCompile>
-    <Link>
-      <SubSystem>Console</SubSystem>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
-    <ClCompile>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <AdditionalIncludeDirectories>..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PrecompiledHeaderFile>
-      </PrecompiledHeaderFile>
-      <PrecompiledHeaderOutputFile>
-      </PrecompiledHeaderOutputFile>
-    </ClCompile>
-    <Link>
-      <SubSystem>Console</SubSystem>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <Optimization>MaxSpeed</Optimization>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <AdditionalIncludeDirectories>..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PrecompiledHeaderFile />
-      <PrecompiledHeaderOutputFile />
-    </ClCompile>
-    <Link>
-      <SubSystem>Console</SubSystem>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <EnableCOMDATFolding>true</EnableCOMDATFolding>
-      <OptimizeReferences>true</OptimizeReferences>
-      <AdditionalLibraryDirectories>%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
-      <AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
-    <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <Optimization>MaxSpeed</Optimization>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <AdditionalIncludeDirectories>..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PrecompiledHeaderFile>
-      </PrecompiledHeaderFile>
-      <PrecompiledHeaderOutputFile>
-      </PrecompiledHeaderOutputFile>
-    </ClCompile>
-    <Link>
-      <SubSystem>Console</SubSystem>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <EnableCOMDATFolding>true</EnableCOMDATFolding>
-      <OptimizeReferences>true</OptimizeReferences>
-      <AdditionalLibraryDirectories>%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
-      <AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
-    </Link>
-  </ItemDefinitionGroup>
-  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
-  <ImportGroup Label="ExtensionTargets">
-  </ImportGroup>
-</Project>

example/jni/Android.mk

@@ -1,15 +0,0 @@
-# Setup a project
-LOCAL_PATH := $(call my-dir)
-include $(CLEAR_VARS)
-
-LOCAL_MODULE := example
-LOCAL_SRC_FILES := example.cpp
-LOCAL_CPPFLAGS += -Wall -Wshadow -Wextra -pedantic -std=c++11 -fPIE -pie
-LOCAL_LDFLAGS +=  -fPIE -pie
-
-# Add exception support and set path for spdlog's headers
-LOCAL_CPPFLAGS += -fexceptions -I../include
-# Use android's log library
-LOCAL_LDFLAGS += -llog
-
-include $(BUILD_EXECUTABLE)

example/jni/Application.mk

@@ -1,2 +0,0 @@
-# Exceptions are used in spdlog. Link to an exception-ready C++ runtime.
-APP_STL = gnustl_static

example/jni/example.cpp

@@ -1,157 +0,0 @@
-//
-// Copyright(c) 2015 Gabi Melman.
-// Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
-//
-// spdlog usage example
-//
-//
-
-#define SPDLOG_TRACE_ON
-#define SPDLOG_DEBUG_ON
-
-#include "spdlog/spdlog.h"
-
-#include <iostream>
-#include <memory>
-
-void async_example();
-void syslog_example();
-void android_example();
-void user_defined_example();
-void err_handler_example();
-
-namespace spd = spdlog;
-int main(int, char *[])
-{
-    try
-    {
-        // Console logger with color
-        auto console = spd::stdout_color_mt("console");
-        console->info("Welcome to spdlog!");
-        console->error("Some error message with arg{}..", 1);
-
-        // Formatting examples
-        console->warn("Easy padding in numbers like {:08d}", 12);
-        console->critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42);
-        console->info("Support for floats {:03.2f}", 1.23456);
-        console->info("Positional args are {1} {0}..", "too", "supported");
-        console->info("{:<30}", "left aligned");
-
-        spd::get("console")->info("loggers can be retrieved from a global registry using the spdlog::get(logger_name) function");
-
-        // Create basic file logger (not rotated)
-        auto my_logger = spd::basic_logger_mt("basic_logger", "logs/basic-log.txt");
-        my_logger->info("Some log message");
-
-        // Create a file rotating logger with 5mb size max and 3 rotated files
-        auto rotating_logger = spd::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
-        for (int i = 0; i < 10; ++i)
-            rotating_logger->info("{} * {} equals {:>10}", i, i, i * i);
-
-        // Create a daily logger - a new file is created every day on 2:30am
-        auto daily_logger = spd::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
-        // trigger flush if the log severity is error or higher
-        daily_logger->flush_on(spd::level::err);
-        daily_logger->info(123.44);
-
-        // Customize msg format for all messages
-        spd::set_pattern("*** [%H:%M:%S %z] [thread %t] %v ***");
-        rotating_logger->info("This is another message with custom format");
-
-        // Runtime log levels
-        spd::set_level(spd::level::info); // Set global log level to info
-        console->debug("This message should not be displayed!");
-        console->set_level(spd::level::debug); // Set specific logger's log level
-        console->debug("This message should be displayed..");
-
-        // Compile time log levels
-        // define SPDLOG_DEBUG_ON or SPDLOG_TRACE_ON
-        SPDLOG_TRACE(console, "Enabled only #ifdef SPDLOG_TRACE_ON..{} ,{}", 1, 3.23);
-        SPDLOG_DEBUG(console, "Enabled only #ifdef SPDLOG_DEBUG_ON.. {} ,{}", 1, 3.23);
-
-        // Asynchronous logging is very fast..
-        // Just call spdlog::set_async_mode(q_size) and all created loggers from now on will be asynchronous..
-        async_example();
-
-        // syslog example. linux/osx only
-        syslog_example();
-
-        // android example. compile with NDK
-        android_example();
-
-        // Log user-defined types example
-        user_defined_example();
-
-        // Change default log error handler
-        err_handler_example();
-
-        // Apply a function on all registered loggers
-        spd::apply_all([&](std::shared_ptr<spdlog::logger> l) { l->info("End of example."); });
-
-        // Release and close all loggers
-        spdlog::drop_all();
-    }
-    // Exceptions will only be thrown upon failed logger or sink construction (not during logging)
-    catch (const spd::spdlog_ex &ex)
-    {
-        std::cout << "Log init failed: " << ex.what() << std::endl;
-        return 1;
-    }
-}
-
-void async_example()
-{
-    size_t q_size = 4096; // queue size must be power of 2
-    spdlog::set_async_mode(q_size);
-    auto async_file = spd::daily_logger_st("async_file_logger", "logs/async_log.txt");
-    for (int i = 0; i < 100; ++i)
-        async_file->info("Async message #{}", i);
-}
-
-// syslog example (linux/osx/freebsd)
-void syslog_example()
-{
-#ifdef SPDLOG_ENABLE_SYSLOG
-    std::string ident = "spdlog-example";
-    auto syslog_logger = spd::syslog_logger("syslog", ident, LOG_PID);
-    syslog_logger->warn("This is warning that will end up in syslog.");
-#endif
-}
-
-// Android example
-void android_example()
-{
-#if defined(__ANDROID__)
-    std::string tag = "spdlog-android";
-    auto android_logger = spd::android_logger("android", tag);
-    android_logger->critical("Use \"adb shell logcat\" to view this message.");
-#endif
-}
-
-// user defined types logging by implementing operator<<
-struct my_type
-{
-    int i;
-    template<typename OStream>
-    friend OStream &operator<<(OStream &os, const my_type &c)
-    {
-        return os << "[my_type i=" << c.i << "]";
-    }
-};
-
-#include "spdlog/fmt/ostr.h" // must be included
-void user_defined_example()
-{
-    spd::get("console")->info("user defined type: {}", my_type{14});
-}
-
-//
-// custom error handler
-//
-void err_handler_example()
-{
-    // can be set globaly or per logger(logger->set_error_handler(..))
-    spdlog::set_error_handler([](const std::string &msg) { std::cerr << "my err handler: " << msg << std::endl; });
-    spd::get("console")->info("some invalid message to trigger an error {}{}{}{}", 3);
-}

example/logs/.gitignore

@@ -1 +0,0 @@
-*.txt

example/multisink.cpp

@@ -1,46 +0,0 @@
-#include "spdlog/sinks/basic_file_sink.h"
-#include "spdlog/sinks/stdout_sinks.h"
-#include "spdlog/spdlog.h"
-#include <iostream>
-#include <memory>
-
-int main(int, char *[])
-{
-    bool enable_debug = true;
-    try
-    {
-        // This other example use a single logger with multiple sinks.
-        // This means that the same log_msg is forwarded to multiple sinks;
-        // Each sink can have it's own log level and a message will be logged.
-        std::vector<spdlog::sink_ptr> sinks;
-        sinks.push_back(std::make_shared<spdlog::sinks::stdout_sink_mt>());
-        sinks.push_back(std::make_shared<spdlog::sinks::basic_file_sink_mt>("./log_regular_file.txt"));
-        sinks.push_back(std::make_shared<spdlog::sinks::basic_file_sink_mt>("./log_debug_file.txt"));
-
-        spdlog::logger console_multisink("multisink", sinks.begin(), sinks.end());
-        console_multisink.set_level(spdlog::level::warn);
-
-        sinks[0]->set_level(spdlog::level::trace); // console. Allow everything.  Default value
-        sinks[1]->set_level(spdlog::level::trace); //  regular file. Allow everything.  Default value
-        sinks[2]->set_level(spdlog::level::off);   //  regular file. Ignore everything.
-
-        console_multisink.warn("warn: will print only on console and regular file");
-
-        if (enable_debug)
-        {
-            console_multisink.set_level(spdlog::level::debug); // level of the logger
-            sinks[1]->set_level(spdlog::level::debug);         // regular file
-            sinks[2]->set_level(spdlog::level::debug);         // debug file
-        }
-        console_multisink.debug("Debug: you should see this on console and both files");
-
-        // Release and close all loggers
-        spdlog::drop_all();
-    }
-    // Exceptions will only be thrown upon failed logger or sink construction (not during logging)
-    catch (const spdlog::spdlog_ex &ex)
-    {
-        std::cout << "Log init failed: " << ex.what() << std::endl;
-        return 1;
-    }
-}

example/utils.h

@@ -1,34 +0,0 @@
-//
-// Copyright(c) 2015 Gabi Melman.
-// Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
-
-#pragma once
-
-#include <iomanip>
-#include <locale>
-#include <sstream>
-
-namespace utils {
-
-template<typename T>
-inline std::string format(const T &value)
-{
-    static std::locale loc("");
-    std::stringstream ss;
-    ss.imbue(loc);
-    ss << value;
-    return ss.str();
-}
-
-template<>
-inline std::string format(const double &value)
-{
-    static std::locale loc("");
-    std::stringstream ss;
-    ss.imbue(loc);
-    ss << std::fixed << std::setprecision(1) << value;
-    return ss.str();
-}
-
-} // namespace utils

format.sh

@@ -1,9 +0,0 @@
-#!/bin/bash
-echo -n "Running dos2unix     "
-find . -name "*\.h" -o -name "*\.cpp"|grep -v bundled|xargs -I {} sh -c "dos2unix '{}' 2>/dev/null; echo -n '.'"
-echo
-echo -n "Running clang-format "
-find . -name "*\.h" -o -name "*\.cpp"|grep -v bundled|xargs -I {} sh -c "clang-format -i {}; echo -n '.'"
-echo
-
-

include/spdlog/async.h

@@ -1,15 +1,12 @@
-
-//
-// Copyright(c) 2018 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
 //
 // Async logging using global thread pool
 // All loggers created here share same global thread pool.
-// Each log message is pushed to a queue along withe a shared pointer to the
+// Each log message is pushed to a queue along with a shared pointer to the
 // logger.
 // If a logger deleted while having pending messages in the queue, it's actual
 // destruction will defer
@@ -17,10 +14,11 @@
 // This is because each message in the queue holds a shared_ptr to the
 // originating logger.
 
-#include "spdlog/async_logger.h"
-#include "spdlog/details/registry.h"
-#include "spdlog/details/thread_pool.h"
+#include <spdlog/async_logger.h>
+#include <spdlog/details/registry.h>
+#include <spdlog/details/thread_pool.h>
 
+#include <functional>
 #include <memory>
 #include <mutex>
 
@@ -33,26 +31,26 @@ static const size_t default_async_q_size = 8192;
 // async logger factory - creates async loggers backed with thread pool.
 // if a global thread pool doesn't already exist, create it with default queue
 // size of 8192 items and single thread.
-template<async_overflow_policy OverflowPolicy = async_overflow_policy::block>
-struct async_factory_impl
-{
-    template<typename Sink, typename... SinkArgs>
-    static std::shared_ptr<async_logger> create(const std::string &logger_name, SinkArgs &&... args)
-    {
+template <async_overflow_policy OverflowPolicy = async_overflow_policy::block>
+struct async_factory_impl {
+    template <typename Sink, typename... SinkArgs>
+    static std::shared_ptr<async_logger> create(std::string logger_name, SinkArgs &&...args) {
         auto &registry_inst = details::registry::instance();
 
         // create global thread pool if not already exists..
-        std::lock_guard<std::recursive_mutex> tp_lock(registry_inst.tp_mutex());
+
+        auto &mutex = registry_inst.tp_mutex();
+        std::lock_guard<std::recursive_mutex> tp_lock(mutex);
         auto tp = registry_inst.get_tp();
-        if (tp == nullptr)
-        {
-            tp = std::make_shared<details::thread_pool>(details::default_async_q_size, 1);
+        if (tp == nullptr) {
+            tp = std::make_shared<details::thread_pool>(details::default_async_q_size, 1U);
             registry_inst.set_tp(tp);
         }
 
         auto sink = std::make_shared<Sink>(std::forward<SinkArgs>(args)...);
-        auto new_logger = std::make_shared<async_logger>(logger_name, std::move(sink), std::move(tp), OverflowPolicy);
-        registry_inst.register_and_init(new_logger);
+        auto new_logger = std::make_shared<async_logger>(std::move(logger_name), std::move(sink),
+                                                         std::move(tp), OverflowPolicy);
+        registry_inst.initialize_logger(new_logger);
         return new_logger;
     }
 };
@@ -60,28 +58,42 @@ struct async_factory_impl
 using async_factory = async_factory_impl<async_overflow_policy::block>;
 using async_factory_nonblock = async_factory_impl<async_overflow_policy::overrun_oldest>;
 
-template<typename Sink, typename... SinkArgs>
-inline std::shared_ptr<spdlog::logger> create_async(const std::string &logger_name, SinkArgs &&... sink_args)
-{
-    return async_factory::create<Sink>(logger_name, std::forward<SinkArgs>(sink_args)...);
+template <typename Sink, typename... SinkArgs>
+inline std::shared_ptr<spdlog::logger> create_async(std::string logger_name,
+                                                    SinkArgs &&...sink_args) {
+    return async_factory::create<Sink>(std::move(logger_name),
+                                       std::forward<SinkArgs>(sink_args)...);
 }
 
-template<typename Sink, typename... SinkArgs>
-inline std::shared_ptr<spdlog::logger> create_async_nb(const std::string &logger_name, SinkArgs &&... sink_args)
-{
-    return async_factory_nonblock::create<Sink>(logger_name, std::forward<SinkArgs>(sink_args)...);
+template <typename Sink, typename... SinkArgs>
+inline std::shared_ptr<spdlog::logger> create_async_nb(std::string logger_name,
+                                                       SinkArgs &&...sink_args) {
+    return async_factory_nonblock::create<Sink>(std::move(logger_name),
+                                                std::forward<SinkArgs>(sink_args)...);
 }
 
 // set global thread pool.
-inline void init_thread_pool(size_t q_size, size_t thread_count)
-{
-    auto tp = std::make_shared<details::thread_pool>(q_size, thread_count);
+inline void init_thread_pool(size_t q_size,
+                             size_t thread_count,
+                             std::function<void()> on_thread_start,
+                             std::function<void()> on_thread_stop) {
+    auto tp = std::make_shared<details::thread_pool>(q_size, thread_count, on_thread_start,
+                                                     on_thread_stop);
     details::registry::instance().set_tp(std::move(tp));
 }
 
+inline void init_thread_pool(size_t q_size,
+                             size_t thread_count,
+                             std::function<void()> on_thread_start) {
+    init_thread_pool(q_size, thread_count, on_thread_start, [] {});
+}
+
+inline void init_thread_pool(size_t q_size, size_t thread_count) {
+    init_thread_pool(q_size, thread_count, [] {}, [] {});
+}
+
 // get the global thread pool.
-inline std::shared_ptr<spdlog::details::thread_pool> thread_pool()
-{
+inline std::shared_ptr<spdlog::details::thread_pool> thread_pool() {
     return details::registry::instance().get_tp();
 }
-} // namespace spdlog
+}  // namespace spdlog

include/spdlog/async_logger-inl.h

@@ -0,0 +1,84 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/async_logger.h>
+#endif
+
+#include <spdlog/details/thread_pool.h>
+#include <spdlog/sinks/sink.h>
+
+#include <memory>
+#include <string>
+
+SPDLOG_INLINE spdlog::async_logger::async_logger(std::string logger_name,
+                                                 sinks_init_list sinks_list,
+                                                 std::weak_ptr<details::thread_pool> tp,
+                                                 async_overflow_policy overflow_policy)
+    : async_logger(std::move(logger_name),
+                   sinks_list.begin(),
+                   sinks_list.end(),
+                   std::move(tp),
+                   overflow_policy) {}
+
+SPDLOG_INLINE spdlog::async_logger::async_logger(std::string logger_name,
+                                                 sink_ptr single_sink,
+                                                 std::weak_ptr<details::thread_pool> tp,
+                                                 async_overflow_policy overflow_policy)
+    : async_logger(
+          std::move(logger_name), {std::move(single_sink)}, std::move(tp), overflow_policy) {}
+
+// send the log message to the thread pool
+SPDLOG_INLINE void spdlog::async_logger::sink_it_(const details::log_msg &msg){
+    SPDLOG_TRY{if (auto pool_ptr = thread_pool_.lock()){
+        pool_ptr -> post_log(shared_from_this(), msg, overflow_policy_);
+}
+else {
+    throw_spdlog_ex("async log: thread pool doesn't exist anymore");
+}
+}
+SPDLOG_LOGGER_CATCH(msg.source)
+}
+
+// send flush request to the thread pool
+SPDLOG_INLINE void spdlog::async_logger::flush_(){
+    SPDLOG_TRY{if (auto pool_ptr = thread_pool_.lock()){
+        pool_ptr -> post_flush(shared_from_this(), overflow_policy_);
+}
+else {
+    throw_spdlog_ex("async flush: thread pool doesn't exist anymore");
+}
+}
+SPDLOG_LOGGER_CATCH(source_loc())
+}
+
+//
+// backend functions - called from the thread pool to do the actual job
+//
+SPDLOG_INLINE void spdlog::async_logger::backend_sink_it_(const details::log_msg &msg) {
+    for (auto &sink : sinks_) {
+        if (sink->should_log(msg.level)) {
+            SPDLOG_TRY { sink->log(msg); }
+            SPDLOG_LOGGER_CATCH(msg.source)
+        }
+    }
+
+    if (should_flush_(msg)) {
+        backend_flush_();
+    }
+}
+
+SPDLOG_INLINE void spdlog::async_logger::backend_flush_() {
+    for (auto &sink : sinks_) {
+        SPDLOG_TRY { sink->flush(); }
+        SPDLOG_LOGGER_CATCH(source_loc())
+    }
+}
+
+SPDLOG_INLINE std::shared_ptr<spdlog::logger> spdlog::async_logger::clone(std::string new_name) {
+    auto cloned = std::make_shared<spdlog::async_logger>(*this);
+    cloned->name_ = std::move(new_name);
+    return cloned;
+}

include/spdlog/async_logger.h

@@ -1,73 +1,74 @@
-//
-// Copyright(c) 2015 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
-// Very fast asynchronous logger (millions of logs per second on an average
-// desktop)
-// Uses pre allocated lockfree queue for maximum throughput even under large
-// number of threads.
+// Fast asynchronous logger.
+// Uses pre allocated queue.
 // Creates a single back thread to pop messages from the queue and log them.
 //
 // Upon each log write the logger:
 //    1. Checks if its log level is enough to log the message
 //    2. Push a new copy of the message to a queue (or block the caller until
 //    space is available in the queue)
-//    3. will throw spdlog_ex upon log exceptions
 // Upon destruction, logs all remaining messages in the queue before
 // destructing..
 
-#include "spdlog/common.h"
-#include "spdlog/logger.h"
-
-#include <chrono>
-#include <memory>
-#include <string>
+#include <spdlog/logger.h>
 
 namespace spdlog {
 
 // Async overflow policy - block by default.
-enum class async_overflow_policy
-{
-    block,         // Block until message can be enqueued
-    overrun_oldest // Discard oldest message in the queue if full when trying to
-                   // add new item.
+enum class async_overflow_policy {
+    block,           // Block until message can be enqueued
+    overrun_oldest,  // Discard oldest message in the queue if full when trying to
+                     // add new item.
+    discard_new      // Discard new message if the queue is full when trying to add new item.
 };
 
 namespace details {
 class thread_pool;
 }
 
-class async_logger final : public std::enable_shared_from_this<async_logger>, public logger
-{
+class SPDLOG_API async_logger final : public std::enable_shared_from_this<async_logger>,
+                                      public logger {
     friend class details::thread_pool;
 
 public:
-    template<typename It>
-    async_logger(std::string logger_name, It begin, It end, std::weak_ptr<details::thread_pool> tp,
-        async_overflow_policy overflow_policy = async_overflow_policy::block);
+    template <typename It>
+    async_logger(std::string logger_name,
+                 It begin,
+                 It end,
+                 std::weak_ptr<details::thread_pool> tp,
+                 async_overflow_policy overflow_policy = async_overflow_policy::block)
+        : logger(std::move(logger_name), begin, end),
+          thread_pool_(std::move(tp)),
+          overflow_policy_(overflow_policy) {}
 
-    async_logger(std::string logger_name, sinks_init_list sinks_list, std::weak_ptr<details::thread_pool> tp,
-        async_overflow_policy overflow_policy = async_overflow_policy::block);
+    async_logger(std::string logger_name,
+                 sinks_init_list sinks_list,
+                 std::weak_ptr<details::thread_pool> tp,
+                 async_overflow_policy overflow_policy = async_overflow_policy::block);
 
-    async_logger(std::string logger_name, sink_ptr single_sink, std::weak_ptr<details::thread_pool> tp,
-        async_overflow_policy overflow_policy = async_overflow_policy::block);
+    async_logger(std::string logger_name,
+                 sink_ptr single_sink,
+                 std::weak_ptr<details::thread_pool> tp,
+                 async_overflow_policy overflow_policy = async_overflow_policy::block);
 
     std::shared_ptr<logger> clone(std::string new_name) override;
 
 protected:
-    void sink_it_(details::log_msg &msg) override;
+    void sink_it_(const details::log_msg &msg) override;
     void flush_() override;
-
-    void backend_log_(const details::log_msg &incoming_log_msg);
+    void backend_sink_it_(const details::log_msg &incoming_log_msg);
     void backend_flush_();
 
 private:
     std::weak_ptr<details::thread_pool> thread_pool_;
     async_overflow_policy overflow_policy_;
 };
-} // namespace spdlog
+}  // namespace spdlog
 
-#include "details/async_logger_impl.h"
+#ifdef SPDLOG_HEADER_ONLY
+    #include "async_logger-inl.h"
+#endif

include/spdlog/cfg/argv.h

@@ -0,0 +1,40 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+#include <spdlog/cfg/helpers.h>
+#include <spdlog/details/registry.h>
+
+//
+// Init log levels using each argv entry that starts with "SPDLOG_LEVEL="
+//
+// set all loggers to debug level:
+// example.exe "SPDLOG_LEVEL=debug"
+
+// set logger1 to trace level
+// example.exe "SPDLOG_LEVEL=logger1=trace"
+
+// turn off all logging except for logger1 and logger2:
+// example.exe "SPDLOG_LEVEL=off,logger1=debug,logger2=info"
+
+namespace spdlog {
+namespace cfg {
+
+// search for SPDLOG_LEVEL= in the args and use it to init the levels
+inline void load_argv_levels(int argc, const char **argv) {
+    const std::string spdlog_level_prefix = "SPDLOG_LEVEL=";
+    for (int i = 1; i < argc; i++) {
+        std::string arg = argv[i];
+        if (arg.find(spdlog_level_prefix) == 0) {
+            auto levels_string = arg.substr(spdlog_level_prefix.size());
+            helpers::load_levels(levels_string);
+        }
+    }
+}
+
+inline void load_argv_levels(int argc, char **argv) {
+    load_argv_levels(argc, const_cast<const char **>(argv));
+}
+
+}  // namespace cfg
+}  // namespace spdlog

include/spdlog/cfg/env.h

@@ -0,0 +1,36 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+#include <spdlog/cfg/helpers.h>
+#include <spdlog/details/os.h>
+#include <spdlog/details/registry.h>
+
+//
+// Init levels and patterns from env variables SPDLOG_LEVEL
+// Inspired from Rust's "env_logger" crate (https://crates.io/crates/env_logger).
+// Note - fallback to "info" level on unrecognized levels
+//
+// Examples:
+//
+// set global level to debug:
+// export SPDLOG_LEVEL=debug
+//
+// turn off all logging except for logger1:
+// export SPDLOG_LEVEL="*=off,logger1=debug"
+//
+
+// turn off all logging except for logger1 and logger2:
+// export SPDLOG_LEVEL="off,logger1=debug,logger2=info"
+
+namespace spdlog {
+namespace cfg {
+inline void load_env_levels(const char* var = "SPDLOG_LEVEL") {
+    auto env_val = details::os::getenv(var);
+    if (!env_val.empty()) {
+        helpers::load_levels(env_val);
+    }
+}
+
+}  // namespace cfg
+}  // namespace spdlog

include/spdlog/cfg/helpers-inl.h

@@ -0,0 +1,107 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/cfg/helpers.h>
+#endif
+
+#include <spdlog/details/os.h>
+#include <spdlog/details/registry.h>
+#include <spdlog/spdlog.h>
+
+#include <algorithm>
+#include <sstream>
+#include <string>
+#include <utility>
+
+namespace spdlog {
+namespace cfg {
+namespace helpers {
+
+// inplace convert to lowercase
+inline std::string &to_lower_(std::string &str) {
+    std::transform(str.begin(), str.end(), str.begin(), [](char ch) {
+        return static_cast<char>((ch >= 'A' && ch <= 'Z') ? ch + ('a' - 'A') : ch);
+    });
+    return str;
+}
+
+// inplace trim spaces
+inline std::string &trim_(std::string &str) {
+    const char *spaces = " \n\r\t";
+    str.erase(str.find_last_not_of(spaces) + 1);
+    str.erase(0, str.find_first_not_of(spaces));
+    return str;
+}
+
+// return (name,value) trimmed pair from given "name=value" string.
+// return empty string on missing parts
+// "key=val" => ("key", "val")
+// " key  =  val " => ("key", "val")
+// "key=" => ("key", "")
+// "val" => ("", "val")
+
+inline std::pair<std::string, std::string> extract_kv_(char sep, const std::string &str) {
+    auto n = str.find(sep);
+    std::string k, v;
+    if (n == std::string::npos) {
+        v = str;
+    } else {
+        k = str.substr(0, n);
+        v = str.substr(n + 1);
+    }
+    return std::make_pair(trim_(k), trim_(v));
+}
+
+// return vector of key/value pairs from sequence of "K1=V1,K2=V2,.."
+// "a=AAA,b=BBB,c=CCC,.." => {("a","AAA"),("b","BBB"),("c", "CCC"),...}
+inline std::unordered_map<std::string, std::string> extract_key_vals_(const std::string &str) {
+    std::string token;
+    std::istringstream token_stream(str);
+    std::unordered_map<std::string, std::string> rv{};
+    while (std::getline(token_stream, token, ',')) {
+        if (token.empty()) {
+            continue;
+        }
+        auto kv = extract_kv_('=', token);
+        rv[kv.first] = kv.second;
+    }
+    return rv;
+}
+
+SPDLOG_INLINE void load_levels(const std::string &input) {
+    if (input.empty() || input.size() > 512) {
+        return;
+    }
+
+    auto key_vals = extract_key_vals_(input);
+    std::unordered_map<std::string, level::level_enum> levels;
+    level::level_enum global_level = level::info;
+    bool global_level_found = false;
+
+    for (auto &name_level : key_vals) {
+        auto &logger_name = name_level.first;
+        auto level_name = to_lower_(name_level.second);
+        auto level = level::from_str(level_name);
+        // ignore unrecognized level names
+        if (level == level::off && level_name != "off") {
+            continue;
+        }
+        if (logger_name.empty())  // no logger name indicate global level
+        {
+            global_level_found = true;
+            global_level = level;
+        } else {
+            levels[logger_name] = level;
+        }
+    }
+
+    details::registry::instance().set_levels(std::move(levels),
+                                             global_level_found ? &global_level : nullptr);
+}
+
+}  // namespace helpers
+}  // namespace cfg
+}  // namespace spdlog

include/spdlog/cfg/helpers.h

@@ -0,0 +1,29 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <unordered_map>
+
+namespace spdlog {
+namespace cfg {
+namespace helpers {
+//
+// Init levels from given string
+//
+// Examples:
+//
+// set global level to debug: "debug"
+// turn off all logging except for logger1: "off,logger1=debug"
+// turn off all logging except for logger1 and logger2: "off,logger1=debug,logger2=info"
+//
+SPDLOG_API void load_levels(const std::string &txt);
+}  // namespace helpers
+
+}  // namespace cfg
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "helpers-inl.h"
+#endif  // SPDLOG_HEADER_ONLY

include/spdlog/common-inl.h

@@ -0,0 +1,68 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/common.h>
+#endif
+
+#include <algorithm>
+#include <iterator>
+
+namespace spdlog {
+namespace level {
+
+#if __cplusplus >= 201703L
+constexpr
+#endif
+    static string_view_t level_string_views[] SPDLOG_LEVEL_NAMES;
+
+static const char *short_level_names[] SPDLOG_SHORT_LEVEL_NAMES;
+
+SPDLOG_INLINE const string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT {
+    return level_string_views[l];
+}
+
+SPDLOG_INLINE const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT {
+    return short_level_names[l];
+}
+
+SPDLOG_INLINE spdlog::level::level_enum from_str(const std::string &name) SPDLOG_NOEXCEPT {
+    auto it = std::find(std::begin(level_string_views), std::end(level_string_views), name);
+    if (it != std::end(level_string_views))
+        return static_cast<level::level_enum>(std::distance(std::begin(level_string_views), it));
+
+    // check also for "warn" and "err" before giving up..
+    if (name == "warn") {
+        return level::warn;
+    }
+    if (name == "err") {
+        return level::err;
+    }
+    return level::off;
+}
+}  // namespace level
+
+SPDLOG_INLINE spdlog_ex::spdlog_ex(std::string msg)
+    : msg_(std::move(msg)) {}
+
+SPDLOG_INLINE spdlog_ex::spdlog_ex(const std::string &msg, int last_errno) {
+#ifdef SPDLOG_USE_STD_FORMAT
+    msg_ = std::system_error(std::error_code(last_errno, std::generic_category()), msg).what();
+#else
+    memory_buf_t outbuf;
+    fmt::format_system_error(outbuf, last_errno, msg.c_str());
+    msg_ = fmt::to_string(outbuf);
+#endif
+}
+
+SPDLOG_INLINE const char *spdlog_ex::what() const SPDLOG_NOEXCEPT { return msg_.c_str(); }
+
+SPDLOG_INLINE void throw_spdlog_ex(const std::string &msg, int last_errno) {
+    SPDLOG_THROW(spdlog_ex(msg, last_errno));
+}
+
+SPDLOG_INLINE void throw_spdlog_ex(std::string msg) { SPDLOG_THROW(spdlog_ex(std::move(msg))); }
+
+}  // namespace spdlog

include/spdlog/common.h

@@ -1,47 +1,124 @@
-//
-// Copyright(c) 2015 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
-#include "spdlog/tweakme.h"
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/tweakme.h>
 
 #include <atomic>
 #include <chrono>
+#include <cstdio>
+#include <exception>
 #include <functional>
 #include <initializer_list>
 #include <memory>
-#include <stdexcept>
 #include <string>
 #include <type_traits>
-#include <unordered_map>
 
-#if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
-#include <codecvt>
-#include <locale>
+#ifdef SPDLOG_USE_STD_FORMAT
+    #include <version>
+    #if __cpp_lib_format >= 202207L
+        #include <format>
+    #else
+        #include <string_view>
+    #endif
 #endif
 
-#include "spdlog/details/null_mutex.h"
+#ifdef SPDLOG_COMPILED_LIB
+    #undef SPDLOG_HEADER_ONLY
+    #if defined(SPDLOG_SHARED_LIB)
+        #if defined(_WIN32)
+            #ifdef spdlog_EXPORTS
+                #define SPDLOG_API __declspec(dllexport)
+            #else  // !spdlog_EXPORTS
+                #define SPDLOG_API __declspec(dllimport)
+            #endif
+        #else  // !defined(_WIN32)
+            #define SPDLOG_API __attribute__((visibility("default")))
+        #endif
+    #else  // !defined(SPDLOG_SHARED_LIB)
+        #define SPDLOG_API
+    #endif
+    #define SPDLOG_INLINE
+#else  // !defined(SPDLOG_COMPILED_LIB)
+    #define SPDLOG_API
+    #define SPDLOG_HEADER_ONLY
+    #define SPDLOG_INLINE inline
+#endif  // #ifdef SPDLOG_COMPILED_LIB
 
-// visual studio upto 2013 does not support noexcept nor constexpr
-#if defined(_MSC_VER) && (_MSC_VER < 1900)
-#define SPDLOG_NOEXCEPT throw()
-#define SPDLOG_CONSTEXPR
+#include <spdlog/fmt/fmt.h>
+
+#if !defined(SPDLOG_USE_STD_FORMAT) && \
+    FMT_VERSION >= 80000  // backward compatibility with fmt versions older than 8
+    #define SPDLOG_FMT_RUNTIME(format_string) fmt::runtime(format_string)
+    #define SPDLOG_FMT_STRING(format_string) FMT_STRING(format_string)
+    #if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+        #include <spdlog/fmt/xchar.h>
+    #endif
 #else
-#define SPDLOG_NOEXCEPT noexcept
-#define SPDLOG_CONSTEXPR constexpr
+    #define SPDLOG_FMT_RUNTIME(format_string) format_string
+    #define SPDLOG_FMT_STRING(format_string) format_string
+#endif
+
+// visual studio up to 2013 does not support noexcept nor constexpr
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+    #define SPDLOG_NOEXCEPT _NOEXCEPT
+    #define SPDLOG_CONSTEXPR
+#else
+    #define SPDLOG_NOEXCEPT noexcept
+    #define SPDLOG_CONSTEXPR constexpr
+#endif
+
+// If building with std::format, can just use constexpr, otherwise if building with fmt
+// SPDLOG_CONSTEXPR_FUNC needs to be set the same as FMT_CONSTEXPR to avoid situations where
+// a constexpr function in spdlog could end up calling a non-constexpr function in fmt
+// depending on the compiler
+// If fmt determines it can't use constexpr, we should inline the function instead
+#ifdef SPDLOG_USE_STD_FORMAT
+    #define SPDLOG_CONSTEXPR_FUNC constexpr
+#else  // Being built with fmt
+    #if FMT_USE_CONSTEXPR
+        #define SPDLOG_CONSTEXPR_FUNC FMT_CONSTEXPR
+    #else
+        #define SPDLOG_CONSTEXPR_FUNC inline
+    #endif
 #endif
 
 #if defined(__GNUC__) || defined(__clang__)
-#define SPDLOG_DEPRECATED __attribute__((deprecated))
+    #define SPDLOG_DEPRECATED __attribute__((deprecated))
 #elif defined(_MSC_VER)
-#define SPDLOG_DEPRECATED __declspec(deprecated)
+    #define SPDLOG_DEPRECATED __declspec(deprecated)
 #else
-#define SPDLOG_DEPRECATED
+    #define SPDLOG_DEPRECATED
 #endif
 
-#include "spdlog/fmt/fmt.h"
+// disable thread local on msvc 2013
+#ifndef SPDLOG_NO_TLS
+    #if (defined(_MSC_VER) && (_MSC_VER < 1900)) || defined(__cplusplus_winrt)
+        #define SPDLOG_NO_TLS 1
+    #endif
+#endif
+
+#ifndef SPDLOG_FUNCTION
+    #define SPDLOG_FUNCTION static_cast<const char *>(__FUNCTION__)
+#endif
+
+#ifdef SPDLOG_NO_EXCEPTIONS
+    #define SPDLOG_TRY
+    #define SPDLOG_THROW(ex)                               \
+        do {                                               \
+            printf("spdlog fatal error: %s\n", ex.what()); \
+            std::abort();                                  \
+        } while (0)
+    #define SPDLOG_CATCH_STD
+#else
+    #define SPDLOG_TRY try
+    #define SPDLOG_THROW(ex) throw(ex)
+    #define SPDLOG_CATCH_STD             \
+        catch (const std::exception &) { \
+        }
+#endif
 
 namespace spdlog {
 
@@ -51,10 +128,99 @@ namespace sinks {
 class sink;
 }
 
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+using filename_t = std::wstring;
+    // allow macro expansion to occur in SPDLOG_FILENAME_T
+    #define SPDLOG_FILENAME_T_INNER(s) L##s
+    #define SPDLOG_FILENAME_T(s) SPDLOG_FILENAME_T_INNER(s)
+#else
+using filename_t = std::string;
+    #define SPDLOG_FILENAME_T(s) s
+#endif
+
 using log_clock = std::chrono::system_clock;
 using sink_ptr = std::shared_ptr<sinks::sink>;
 using sinks_init_list = std::initializer_list<sink_ptr>;
-using log_err_handler = std::function<void(const std::string &err_msg)>;
+using err_handler = std::function<void(const std::string &err_msg)>;
+#ifdef SPDLOG_USE_STD_FORMAT
+namespace fmt_lib = std;
+
+using string_view_t = std::string_view;
+using memory_buf_t = std::string;
+
+template <typename... Args>
+    #if __cpp_lib_format >= 202207L
+using format_string_t = std::format_string<Args...>;
+    #else
+using format_string_t = std::string_view;
+    #endif
+
+template <class T, class Char = char>
+struct is_convertible_to_basic_format_string
+    : std::integral_constant<bool, std::is_convertible<T, std::basic_string_view<Char>>::value> {};
+
+    #if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+using wstring_view_t = std::wstring_view;
+using wmemory_buf_t = std::wstring;
+
+template <typename... Args>
+        #if __cpp_lib_format >= 202207L
+using wformat_string_t = std::wformat_string<Args...>;
+        #else
+using wformat_string_t = std::wstring_view;
+        #endif
+    #endif
+    #define SPDLOG_BUF_TO_STRING(x) x
+#else  // use fmt lib instead of std::format
+namespace fmt_lib = fmt;
+
+using string_view_t = fmt::basic_string_view<char>;
+using memory_buf_t = fmt::basic_memory_buffer<char, 250>;
+
+template <typename... Args>
+using format_string_t = fmt::format_string<Args...>;
+
+template <class T>
+using remove_cvref_t = typename std::remove_cv<typename std::remove_reference<T>::type>::type;
+
+template <typename Char>
+    #if FMT_VERSION >= 90101
+using fmt_runtime_string = fmt::runtime_format_string<Char>;
+    #else
+using fmt_runtime_string = fmt::basic_runtime<Char>;
+    #endif
+
+// clang doesn't like SFINAE disabled constructor in std::is_convertible<> so have to repeat the
+// condition from basic_format_string here, in addition, fmt::basic_runtime<Char> is only
+// convertible to basic_format_string<Char> but not basic_string_view<Char>
+template <class T, class Char = char>
+struct is_convertible_to_basic_format_string
+    : std::integral_constant<bool,
+                             std::is_convertible<T, fmt::basic_string_view<Char>>::value ||
+                                 std::is_same<remove_cvref_t<T>, fmt_runtime_string<Char>>::value> {
+};
+
+    #if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+using wstring_view_t = fmt::basic_string_view<wchar_t>;
+using wmemory_buf_t = fmt::basic_memory_buffer<wchar_t, 250>;
+
+template <typename... Args>
+using wformat_string_t = fmt::wformat_string<Args...>;
+    #endif
+    #define SPDLOG_BUF_TO_STRING(x) fmt::to_string(x)
+#endif
+
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+    #ifndef _WIN32
+        #error SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows
+    #endif  // _WIN32
+#endif      // SPDLOG_WCHAR_TO_UTF8_SUPPORT
+
+template <class T>
+struct is_convertible_to_any_format_string
+    : std::integral_constant<bool,
+                             is_convertible_to_basic_format_string<T, char>::value ||
+                                 is_convertible_to_basic_format_string<T, wchar_t>::value> {};
 
 #if defined(SPDLOG_NO_ATOMIC_LEVELS)
 using level_t = details::null_atomic_int;
@@ -62,125 +228,179 @@ using level_t = details::null_atomic_int;
 using level_t = std::atomic<int>;
 #endif
 
+#define SPDLOG_LEVEL_TRACE 0
+#define SPDLOG_LEVEL_DEBUG 1
+#define SPDLOG_LEVEL_INFO 2
+#define SPDLOG_LEVEL_WARN 3
+#define SPDLOG_LEVEL_ERROR 4
+#define SPDLOG_LEVEL_CRITICAL 5
+#define SPDLOG_LEVEL_OFF 6
+
+#if !defined(SPDLOG_ACTIVE_LEVEL)
+    #define SPDLOG_ACTIVE_LEVEL SPDLOG_LEVEL_INFO
+#endif
+
 // Log level enum
 namespace level {
-enum level_enum
-{
-    trace = 0,
-    debug = 1,
-    info = 2,
-    warn = 3,
-    err = 4,
-    critical = 5,
-    off = 6
+enum level_enum : int {
+    trace = SPDLOG_LEVEL_TRACE,
+    debug = SPDLOG_LEVEL_DEBUG,
+    info = SPDLOG_LEVEL_INFO,
+    warn = SPDLOG_LEVEL_WARN,
+    err = SPDLOG_LEVEL_ERROR,
+    critical = SPDLOG_LEVEL_CRITICAL,
+    off = SPDLOG_LEVEL_OFF,
+    n_levels
 };
 
+#define SPDLOG_LEVEL_NAME_TRACE spdlog::string_view_t("trace", 5)
+#define SPDLOG_LEVEL_NAME_DEBUG spdlog::string_view_t("debug", 5)
+#define SPDLOG_LEVEL_NAME_INFO spdlog::string_view_t("info", 4)
+#define SPDLOG_LEVEL_NAME_WARNING spdlog::string_view_t("warning", 7)
+#define SPDLOG_LEVEL_NAME_ERROR spdlog::string_view_t("error", 5)
+#define SPDLOG_LEVEL_NAME_CRITICAL spdlog::string_view_t("critical", 8)
+#define SPDLOG_LEVEL_NAME_OFF spdlog::string_view_t("off", 3)
+
 #if !defined(SPDLOG_LEVEL_NAMES)
-#define SPDLOG_LEVEL_NAMES                                                                                                                 \
-    {                                                                                                                                      \
-        "trace", "debug", "info", "warning", "error", "critical", "off"                                                                    \
-    }
+    #define SPDLOG_LEVEL_NAMES                                                                  \
+        {                                                                                       \
+            SPDLOG_LEVEL_NAME_TRACE, SPDLOG_LEVEL_NAME_DEBUG, SPDLOG_LEVEL_NAME_INFO,           \
+                SPDLOG_LEVEL_NAME_WARNING, SPDLOG_LEVEL_NAME_ERROR, SPDLOG_LEVEL_NAME_CRITICAL, \
+                SPDLOG_LEVEL_NAME_OFF                                                           \
+        }
 #endif
-static const char *level_names[] SPDLOG_LEVEL_NAMES;
 
-static const char *short_level_names[]{"T", "D", "I", "W", "E", "C", "O"};
+#if !defined(SPDLOG_SHORT_LEVEL_NAMES)
 
-inline const char *to_c_str(spdlog::level::level_enum l)
-{
-    return level_names[l];
-}
+    #define SPDLOG_SHORT_LEVEL_NAMES \
+        { "T", "D", "I", "W", "E", "C", "O" }
+#endif
 
-inline const char *to_short_c_str(spdlog::level::level_enum l)
-{
-    return short_level_names[l];
-}
+SPDLOG_API const string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
+SPDLOG_API const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
+SPDLOG_API spdlog::level::level_enum from_str(const std::string &name) SPDLOG_NOEXCEPT;
 
-inline spdlog::level::level_enum from_str(const std::string &name)
-{
-    static std::unordered_map<std::string, level_enum> name_to_level = // map string->level
-        {{level_names[0], level::trace},                               // trace
-            {level_names[1], level::debug},                            // debug
-            {level_names[2], level::info},                             // info
-            {level_names[3], level::warn},                             // warn
-            {level_names[4], level::err},                              // err
-            {level_names[5], level::critical},                         // critical
-            {level_names[6], level::off}};                             // off
+}  // namespace level
 
-    auto lvl_it = name_to_level.find(name);
-    return lvl_it != name_to_level.end() ? lvl_it->second : level::off;
-}
-
-using level_hasher = std::hash<int>;
-} // namespace level
+//
+// Color mode used by sinks with color support.
+//
+enum class color_mode { always, automatic, never };
 
 //
 // Pattern time - specific time getting to use for pattern_formatter.
 // local time by default
 //
-enum class pattern_time_type
-{
-    local, // log localtime
-    utc    // log utc
+enum class pattern_time_type {
+    local,  // log localtime
+    utc     // log utc
 };
 
 //
 // Log exception
 //
-class spdlog_ex : public std::exception
-{
+class SPDLOG_API spdlog_ex : public std::exception {
 public:
-    explicit spdlog_ex(std::string msg)
-        : msg_(std::move(msg))
-    {
-    }
-
-    spdlog_ex(const std::string &msg, int last_errno)
-    {
-        fmt::memory_buffer outbuf;
-        fmt::format_system_error(outbuf, last_errno, msg);
-        msg_ = fmt::to_string(outbuf);
-    }
-
-    const char *what() const SPDLOG_NOEXCEPT override
-    {
-        return msg_.c_str();
-    }
+    explicit spdlog_ex(std::string msg);
+    spdlog_ex(const std::string &msg, int last_errno);
+    const char *what() const SPDLOG_NOEXCEPT override;
 
 private:
     std::string msg_;
 };
 
-//
-// wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)
-//
-#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
-using filename_t = std::wstring;
-#else
-using filename_t = std::string;
-#endif
+[[noreturn]] SPDLOG_API void throw_spdlog_ex(const std::string &msg, int last_errno);
+[[noreturn]] SPDLOG_API void throw_spdlog_ex(std::string msg);
 
-#define SPDLOG_CATCH_AND_HANDLE                                                                                                            \
-    catch (const std::exception &ex)                                                                                                       \
-    {                                                                                                                                      \
-        err_handler_(ex.what());                                                                                                           \
-    }                                                                                                                                      \
-    catch (...)                                                                                                                            \
-    {                                                                                                                                      \
-        err_handler_("Unknown exeption in logger");                                                                                        \
-    }
+struct source_loc {
+    SPDLOG_CONSTEXPR source_loc() = default;
+    SPDLOG_CONSTEXPR source_loc(const char *filename_in, int line_in, const char *funcname_in)
+        : filename{filename_in},
+          line{line_in},
+          funcname{funcname_in} {}
+
+    SPDLOG_CONSTEXPR bool empty() const SPDLOG_NOEXCEPT { return line <= 0; }
+    const char *filename{nullptr};
+    int line{0};
+    const char *funcname{nullptr};
+};
+
+struct file_event_handlers {
+    file_event_handlers()
+        : before_open(nullptr),
+          after_open(nullptr),
+          before_close(nullptr),
+          after_close(nullptr) {}
+
+    std::function<void(const filename_t &filename)> before_open;
+    std::function<void(const filename_t &filename, std::FILE *file_stream)> after_open;
+    std::function<void(const filename_t &filename, std::FILE *file_stream)> before_close;
+    std::function<void(const filename_t &filename)> after_close;
+};
 
 namespace details {
-// make_unique support for pre c++14
 
-#if __cplusplus >= 201402L // C++14 and beyond
+// to_string_view
+
+SPDLOG_CONSTEXPR_FUNC spdlog::string_view_t to_string_view(const memory_buf_t &buf)
+    SPDLOG_NOEXCEPT {
+    return spdlog::string_view_t{buf.data(), buf.size()};
+}
+
+SPDLOG_CONSTEXPR_FUNC spdlog::string_view_t to_string_view(spdlog::string_view_t str)
+    SPDLOG_NOEXCEPT {
+    return str;
+}
+
+#if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+SPDLOG_CONSTEXPR_FUNC spdlog::wstring_view_t to_string_view(const wmemory_buf_t &buf)
+    SPDLOG_NOEXCEPT {
+    return spdlog::wstring_view_t{buf.data(), buf.size()};
+}
+
+SPDLOG_CONSTEXPR_FUNC spdlog::wstring_view_t to_string_view(spdlog::wstring_view_t str)
+    SPDLOG_NOEXCEPT {
+    return str;
+}
+#endif
+
+#if defined(SPDLOG_USE_STD_FORMAT) && __cpp_lib_format >= 202207L
+template <typename T, typename... Args>
+SPDLOG_CONSTEXPR_FUNC std::basic_string_view<T> to_string_view(
+    std::basic_format_string<T, Args...> fmt) SPDLOG_NOEXCEPT {
+    return fmt.get();
+}
+#endif
+
+// make_unique support for pre c++14
+#if __cplusplus >= 201402L  // C++14 and beyond
+using std::enable_if_t;
 using std::make_unique;
 #else
-template<typename T, typename... Args>
-std::unique_ptr<T> make_unique(Args &&... args)
-{
+template <bool B, class T = void>
+using enable_if_t = typename std::enable_if<B, T>::type;
+
+template <typename T, typename... Args>
+std::unique_ptr<T> make_unique(Args &&...args) {
     static_assert(!std::is_array<T>::value, "arrays not supported");
     return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
 }
 #endif
-} // namespace details
-} // namespace spdlog
+
+// to avoid useless casts (see https://github.com/nlohmann/json/issues/2893#issuecomment-889152324)
+template <typename T, typename U, enable_if_t<!std::is_same<T, U>::value, int> = 0>
+constexpr T conditional_static_cast(U value) {
+    return static_cast<T>(value);
+}
+
+template <typename T, typename U, enable_if_t<std::is_same<T, U>::value, int> = 0>
+constexpr T conditional_static_cast(U value) {
+    return value;
+}
+
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "common-inl.h"
+#endif

include/spdlog/details/async_logger_impl.h

@@ -1,110 +0,0 @@
-//
-// Copyright(c) 2015 Gabi Melman.
-// Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
-
-#pragma once
-
-// async logger implementation
-// uses a thread pool to perform the actual logging
-
-#include "spdlog/details/thread_pool.h"
-
-#include <chrono>
-#include <memory>
-#include <string>
-
-template<typename It>
-inline spdlog::async_logger::async_logger(
-    std::string logger_name, It begin, It end, std::weak_ptr<details::thread_pool> tp, async_overflow_policy overflow_policy)
-    : logger(std::move(logger_name), begin, end)
-    , thread_pool_(tp)
-    , overflow_policy_(overflow_policy)
-{
-}
-
-inline spdlog::async_logger::async_logger(
-    std::string logger_name, sinks_init_list sinks_list, std::weak_ptr<details::thread_pool> tp, async_overflow_policy overflow_policy)
-    : async_logger(std::move(logger_name), sinks_list.begin(), sinks_list.end(), tp, overflow_policy)
-{
-}
-
-inline spdlog::async_logger::async_logger(
-    std::string logger_name, sink_ptr single_sink, std::weak_ptr<details::thread_pool> tp, async_overflow_policy overflow_policy)
-    : async_logger(std::move(logger_name), {single_sink}, tp, overflow_policy)
-{
-}
-
-// send the log message to the thread pool
-inline void spdlog::async_logger::sink_it_(details::log_msg &msg)
-{
-#if defined(SPDLOG_ENABLE_MESSAGE_COUNTER)
-    incr_msg_counter_(msg);
-#endif
-    if (auto pool_ptr = thread_pool_.lock())
-    {
-        pool_ptr->post_log(shared_from_this(), std::move(msg), overflow_policy_);
-    }
-    else
-    {
-        throw spdlog_ex("async log: thread pool doesn't exist anymore");
-    }
-}
-
-// send flush request to the thread pool
-inline void spdlog::async_logger::flush_()
-{
-    if (auto pool_ptr = thread_pool_.lock())
-    {
-        pool_ptr->post_flush(shared_from_this(), overflow_policy_);
-    }
-    else
-    {
-        throw spdlog_ex("async flush: thread pool doesn't exist anymore");
-    }
-}
-
-//
-// backend functions - called from the thread pool to do the actual job
-//
-inline void spdlog::async_logger::backend_log_(const details::log_msg &incoming_log_msg)
-{
-    try
-    {
-        for (auto &s : sinks_)
-        {
-            if (s->should_log(incoming_log_msg.level))
-            {
-                s->log(incoming_log_msg);
-            }
-        }
-    }
-    SPDLOG_CATCH_AND_HANDLE
-
-    if (should_flush_(incoming_log_msg))
-    {
-        backend_flush_();
-    }
-}
-
-inline void spdlog::async_logger::backend_flush_()
-{
-    try
-    {
-        for (auto &sink : sinks_)
-        {
-            sink->flush();
-        }
-    }
-    SPDLOG_CATCH_AND_HANDLE
-}
-
-inline std::shared_ptr<spdlog::logger> spdlog::async_logger::clone(std::string new_name)
-{
-    auto cloned = std::make_shared<spdlog::async_logger>(std::move(new_name), sinks_.begin(), sinks_.end(), thread_pool_, overflow_policy_);
-
-    cloned->set_level(this->level());
-    cloned->flush_on(this->flush_level());
-    cloned->set_error_handler(this->error_handler());
-    return std::move(cloned);
-}

include/spdlog/details/backtracer-inl.h

@@ -0,0 +1,63 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/backtracer.h>
+#endif
+namespace spdlog {
+namespace details {
+SPDLOG_INLINE backtracer::backtracer(const backtracer &other) {
+    std::lock_guard<std::mutex> lock(other.mutex_);
+    enabled_ = other.enabled();
+    messages_ = other.messages_;
+}
+
+SPDLOG_INLINE backtracer::backtracer(backtracer &&other) SPDLOG_NOEXCEPT {
+    std::lock_guard<std::mutex> lock(other.mutex_);
+    enabled_ = other.enabled();
+    messages_ = std::move(other.messages_);
+}
+
+SPDLOG_INLINE backtracer &backtracer::operator=(backtracer other) {
+    std::lock_guard<std::mutex> lock(mutex_);
+    enabled_ = other.enabled();
+    messages_ = std::move(other.messages_);
+    return *this;
+}
+
+SPDLOG_INLINE void backtracer::enable(size_t size) {
+    std::lock_guard<std::mutex> lock{mutex_};
+    enabled_.store(true, std::memory_order_relaxed);
+    messages_ = circular_q<log_msg_buffer>{size};
+}
+
+SPDLOG_INLINE void backtracer::disable() {
+    std::lock_guard<std::mutex> lock{mutex_};
+    enabled_.store(false, std::memory_order_relaxed);
+}
+
+SPDLOG_INLINE bool backtracer::enabled() const { return enabled_.load(std::memory_order_relaxed); }
+
+SPDLOG_INLINE void backtracer::push_back(const log_msg &msg) {
+    std::lock_guard<std::mutex> lock{mutex_};
+    messages_.push_back(log_msg_buffer{msg});
+}
+
+SPDLOG_INLINE bool backtracer::empty() const {
+    std::lock_guard<std::mutex> lock{mutex_};
+    return messages_.empty();
+}
+
+// pop all items in the q and apply the given fun on each of them.
+SPDLOG_INLINE void backtracer::foreach_pop(std::function<void(const details::log_msg &)> fun) {
+    std::lock_guard<std::mutex> lock{mutex_};
+    while (!messages_.empty()) {
+        auto &front_msg = messages_.front();
+        fun(front_msg);
+        messages_.pop_front();
+    }
+}
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/backtracer.h

@@ -0,0 +1,45 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/circular_q.h>
+#include <spdlog/details/log_msg_buffer.h>
+
+#include <atomic>
+#include <functional>
+#include <mutex>
+
+// Store log messages in circular buffer.
+// Useful for storing debug data in case of error/warning happens.
+
+namespace spdlog {
+namespace details {
+class SPDLOG_API backtracer {
+    mutable std::mutex mutex_;
+    std::atomic<bool> enabled_{false};
+    circular_q<log_msg_buffer> messages_;
+
+public:
+    backtracer() = default;
+    backtracer(const backtracer &other);
+
+    backtracer(backtracer &&other) SPDLOG_NOEXCEPT;
+    backtracer &operator=(backtracer other);
+
+    void enable(size_t size);
+    void disable();
+    bool enabled() const;
+    void push_back(const log_msg &msg);
+    bool empty() const;
+
+    // pop all items in the q and apply the given fun on each of them.
+    void foreach_pop(std::function<void(const details::log_msg &)> fun);
+};
+
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "backtracer-inl.h"
+#endif

include/spdlog/details/circular_q.h

@@ -1,72 +1,115 @@
-//
-// Copyright(c) 2018 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
-// cirucal q view of std::vector.
+// circular q view of std::vector.
 #pragma once
 
+#include <cassert>
 #include <vector>
 
+#include "spdlog/common.h"
+
 namespace spdlog {
 namespace details {
-template<typename T>
-class circular_q
-{
+template <typename T>
+class circular_q {
+    size_t max_items_ = 0;
+    typename std::vector<T>::size_type head_ = 0;
+    typename std::vector<T>::size_type tail_ = 0;
+    size_t overrun_counter_ = 0;
+    std::vector<T> v_;
+
 public:
-    using item_type = T;
+    using value_type = T;
+
+    // empty ctor - create a disabled queue with no elements allocated at all
+    circular_q() = default;
 
     explicit circular_q(size_t max_items)
-        : max_items_(max_items + 1) // one item is reserved as marker for full q
-        , v_(max_items_)
-    {
+        : max_items_(max_items + 1)  // one item is reserved as marker for full q
+          ,
+          v_(max_items_) {}
+
+    circular_q(const circular_q &) = default;
+    circular_q &operator=(const circular_q &) = default;
+
+    // move cannot be default,
+    // since we need to reset head_, tail_, etc to zero in the moved object
+    circular_q(circular_q &&other) SPDLOG_NOEXCEPT { copy_moveable(std::move(other)); }
+
+    circular_q &operator=(circular_q &&other) SPDLOG_NOEXCEPT {
+        copy_moveable(std::move(other));
+        return *this;
     }
 
     // push back, overrun (oldest) item if no room left
-    void push_back(T &&item)
-    {
-        v_[tail_] = std::move(item);
-        tail_ = (tail_ + 1) % max_items_;
+    void push_back(T &&item) {
+        if (max_items_ > 0) {
+            v_[tail_] = std::move(item);
+            tail_ = (tail_ + 1) % max_items_;
 
-        if (tail_ == head_) // overrun last item if full
-        {
-            head_ = (head_ + 1) % max_items_;
-            ++overrun_counter_;
+            if (tail_ == head_)  // overrun last item if full
+            {
+                head_ = (head_ + 1) % max_items_;
+                ++overrun_counter_;
+            }
         }
     }
 
+    // Return reference to the front item.
+    // If there are no elements in the container, the behavior is undefined.
+    const T &front() const { return v_[head_]; }
+
+    T &front() { return v_[head_]; }
+
+    // Return number of elements actually stored
+    size_t size() const {
+        if (tail_ >= head_) {
+            return tail_ - head_;
+        } else {
+            return max_items_ - (head_ - tail_);
+        }
+    }
+
+    // Return const reference to item by index.
+    // If index is out of range 0…size()-1, the behavior is undefined.
+    const T &at(size_t i) const {
+        assert(i < size());
+        return v_[(head_ + i) % max_items_];
+    }
+
     // Pop item from front.
     // If there are no elements in the container, the behavior is undefined.
-    void pop_front(T &popped_item)
-    {
-        popped_item = std::move(v_[head_]);
-        head_ = (head_ + 1) % max_items_;
-    }
+    void pop_front() { head_ = (head_ + 1) % max_items_; }
 
-    bool empty()
-    {
-        return tail_ == head_;
-    }
+    bool empty() const { return tail_ == head_; }
 
-    bool full()
-    {
+    bool full() const {
         // head is ahead of the tail by 1
-        return ((tail_ + 1) % max_items_) == head_;
+        if (max_items_ > 0) {
+            return ((tail_ + 1) % max_items_) == head_;
+        }
+        return false;
     }
 
-    size_t overrun_counter() const
-    {
-        return overrun_counter_;
-    }
+    size_t overrun_counter() const { return overrun_counter_; }
+
+    void reset_overrun_counter() { overrun_counter_ = 0; }
 
 private:
-    size_t max_items_;
-    typename std::vector<T>::size_type head_ = 0;
-    typename std::vector<T>::size_type tail_ = 0;
+    // copy from other&& and reset it to disabled state
+    void copy_moveable(circular_q &&other) SPDLOG_NOEXCEPT {
+        max_items_ = other.max_items_;
+        head_ = other.head_;
+        tail_ = other.tail_;
+        overrun_counter_ = other.overrun_counter_;
+        v_ = std::move(other.v_);
 
-    std::vector<T> v_;
-
-    size_t overrun_counter_ = 0;
+        // put &&other in disabled, but valid state
+        other.max_items_ = 0;
+        other.head_ = other.tail_ = 0;
+        other.overrun_counter_ = 0;
+    }
 };
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/console_globals.h

@@ -1,74 +1,28 @@
-#pragma once
-//
-// Copyright(c) 2018 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
-#include "spdlog/details/null_mutex.h"
-#include <cstdio>
+#pragma once
+
 #include <mutex>
-
-#ifdef _WIN32
-
-#ifndef NOMINMAX
-#define NOMINMAX // prevent windows redefining min/max
-#endif
-
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-
-#include <windows.h>
-#endif
+#include <spdlog/details/null_mutex.h>
 
 namespace spdlog {
 namespace details {
-struct console_stdout
-{
-    static std::FILE *stream()
-    {
-        return stdout;
-    }
-#ifdef _WIN32
-    static HANDLE handle()
-    {
-        return ::GetStdHandle(STD_OUTPUT_HANDLE);
-    }
-#endif
-};
 
-struct console_stderr
-{
-    static std::FILE *stream()
-    {
-        return stderr;
-    }
-#ifdef _WIN32
-    static HANDLE handle()
-    {
-        return ::GetStdHandle(STD_ERROR_HANDLE);
-    }
-#endif
-};
-
-struct console_mutex
-{
+struct console_mutex {
     using mutex_t = std::mutex;
-    static mutex_t &mutex()
-    {
+    static mutex_t &mutex() {
         static mutex_t s_mutex;
         return s_mutex;
     }
 };
 
-struct console_nullmutex
-{
+struct console_nullmutex {
     using mutex_t = null_mutex;
-    static mutex_t &mutex()
-    {
+    static mutex_t &mutex() {
         static mutex_t s_mutex;
         return s_mutex;
     }
 };
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/file_helper-inl.h

@@ -0,0 +1,153 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/file_helper.h>
+#endif
+
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+
+#include <cerrno>
+#include <chrono>
+#include <cstdio>
+#include <string>
+#include <thread>
+#include <tuple>
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE file_helper::file_helper(const file_event_handlers &event_handlers)
+    : event_handlers_(event_handlers) {}
+
+SPDLOG_INLINE file_helper::~file_helper() { close(); }
+
+SPDLOG_INLINE void file_helper::open(const filename_t &fname, bool truncate) {
+    close();
+    filename_ = fname;
+
+    auto *mode = SPDLOG_FILENAME_T("ab");
+    auto *trunc_mode = SPDLOG_FILENAME_T("wb");
+
+    if (event_handlers_.before_open) {
+        event_handlers_.before_open(filename_);
+    }
+    for (int tries = 0; tries < open_tries_; ++tries) {
+        // create containing folder if not exists already.
+        os::create_dir(os::dir_name(fname));
+        if (truncate) {
+            // Truncate by opening-and-closing a tmp file in "wb" mode, always
+            // opening the actual log-we-write-to in "ab" mode, since that
+            // interacts more politely with eternal processes that might
+            // rotate/truncate the file underneath us.
+            std::FILE *tmp;
+            if (os::fopen_s(&tmp, fname, trunc_mode)) {
+                continue;
+            }
+            std::fclose(tmp);
+        }
+        if (!os::fopen_s(&fd_, fname, mode)) {
+            if (event_handlers_.after_open) {
+                event_handlers_.after_open(filename_, fd_);
+            }
+            return;
+        }
+
+        details::os::sleep_for_millis(open_interval_);
+    }
+
+    throw_spdlog_ex("Failed opening file " + os::filename_to_str(filename_) + " for writing",
+                    errno);
+}
+
+SPDLOG_INLINE void file_helper::reopen(bool truncate) {
+    if (filename_.empty()) {
+        throw_spdlog_ex("Failed re opening file - was not opened before");
+    }
+    this->open(filename_, truncate);
+}
+
+SPDLOG_INLINE void file_helper::flush() {
+    if (std::fflush(fd_) != 0) {
+        throw_spdlog_ex("Failed flush to file " + os::filename_to_str(filename_), errno);
+    }
+}
+
+SPDLOG_INLINE void file_helper::sync() {
+    if (!os::fsync(fd_)) {
+        throw_spdlog_ex("Failed to fsync file " + os::filename_to_str(filename_), errno);
+    }
+}
+
+SPDLOG_INLINE void file_helper::close() {
+    if (fd_ != nullptr) {
+        if (event_handlers_.before_close) {
+            event_handlers_.before_close(filename_, fd_);
+        }
+
+        std::fclose(fd_);
+        fd_ = nullptr;
+
+        if (event_handlers_.after_close) {
+            event_handlers_.after_close(filename_);
+        }
+    }
+}
+
+SPDLOG_INLINE void file_helper::write(const memory_buf_t &buf) {
+    if (fd_ == nullptr) return;
+    size_t msg_size = buf.size();
+    auto data = buf.data();
+
+    if (!details::os::fwrite_bytes(data, msg_size, fd_)) {
+        throw_spdlog_ex("Failed writing to file " + os::filename_to_str(filename_), errno);
+    }
+}
+
+SPDLOG_INLINE size_t file_helper::size() const {
+    if (fd_ == nullptr) {
+        throw_spdlog_ex("Cannot use size() on closed file " + os::filename_to_str(filename_));
+    }
+    return os::filesize(fd_);
+}
+
+SPDLOG_INLINE const filename_t &file_helper::filename() const { return filename_; }
+
+//
+// return file path and its extension:
+//
+// "mylog.txt" => ("mylog", ".txt")
+// "mylog" => ("mylog", "")
+// "mylog." => ("mylog.", "")
+// "/dir1/dir2/mylog.txt" => ("/dir1/dir2/mylog", ".txt")
+//
+// the starting dot in filenames is ignored (hidden files):
+//
+// ".mylog" => (".mylog". "")
+// "my_folder/.mylog" => ("my_folder/.mylog", "")
+// "my_folder/.mylog.txt" => ("my_folder/.mylog", ".txt")
+SPDLOG_INLINE std::tuple<filename_t, filename_t> file_helper::split_by_extension(
+    const filename_t &fname) {
+    auto ext_index = fname.rfind('.');
+
+    // no valid extension found - return whole path and empty string as
+    // extension
+    if (ext_index == filename_t::npos || ext_index == 0 || ext_index == fname.size() - 1) {
+        return std::make_tuple(fname, filename_t());
+    }
+
+    // treat cases like "/etc/rc.d/somelogfile or "/abc/.hiddenfile"
+    auto folder_index = fname.find_last_of(details::os::folder_seps_filename);
+    if (folder_index != filename_t::npos && folder_index >= ext_index - 1) {
+        return std::make_tuple(fname, filename_t());
+    }
+
+    // finally - return a valid base and extension tuple
+    return std::make_tuple(fname.substr(0, ext_index), fname.substr(ext_index));
+}
+
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/file_helper.h

@@ -1,113 +1,35 @@
-//
-// Copyright(c) 2015 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
-// Helper class for file sinks.
-// When failing to open a file, retry several times(5) with a delay interval(10 ms).
-// Throw spdlog_ex exception on errors.
-
-#include "spdlog/details/log_msg.h"
-#include "spdlog/details/os.h"
-
-#include <cerrno>
-#include <chrono>
-#include <cstdio>
-#include <string>
-#include <thread>
+#include <spdlog/common.h>
 #include <tuple>
 
 namespace spdlog {
 namespace details {
 
-class file_helper
-{
+// Helper class for file sinks.
+// When failing to open a file, retry several times(5) with a delay interval(10 ms).
+// Throw spdlog_ex exception on errors.
 
+class SPDLOG_API file_helper {
 public:
-    const int open_tries = 5;
-    const int open_interval = 10;
-
-    explicit file_helper() = default;
+    file_helper() = default;
+    explicit file_helper(const file_event_handlers &event_handlers);
 
     file_helper(const file_helper &) = delete;
     file_helper &operator=(const file_helper &) = delete;
+    ~file_helper();
 
-    ~file_helper()
-    {
-        close();
-    }
-
-    void open(const filename_t &fname, bool truncate = false)
-    {
-        close();
-        auto *mode = truncate ? SPDLOG_FILENAME_T("wb") : SPDLOG_FILENAME_T("ab");
-        _filename = fname;
-        for (int tries = 0; tries < open_tries; ++tries)
-        {
-            if (!os::fopen_s(&fd_, fname, mode))
-            {
-                return;
-            }
-
-            details::os::sleep_for_millis(open_interval);
-        }
-
-        throw spdlog_ex("Failed opening file " + os::filename_to_str(_filename) + " for writing", errno);
-    }
-
-    void reopen(bool truncate)
-    {
-        if (_filename.empty())
-        {
-            throw spdlog_ex("Failed re opening file - was not opened before");
-        }
-        open(_filename, truncate);
-    }
-
-    void flush()
-    {
-        std::fflush(fd_);
-    }
-
-    void close()
-    {
-        if (fd_ != nullptr)
-        {
-            std::fclose(fd_);
-            fd_ = nullptr;
-        }
-    }
-
-    void write(const fmt::memory_buffer &buf)
-    {
-        size_t msg_size = buf.size();
-        auto data = buf.data();
-        if (std::fwrite(data, 1, msg_size, fd_) != msg_size)
-        {
-            throw spdlog_ex("Failed writing to file " + os::filename_to_str(_filename), errno);
-        }
-    }
-
-    size_t size() const
-    {
-        if (fd_ == nullptr)
-        {
-            throw spdlog_ex("Cannot use size() on closed file " + os::filename_to_str(_filename));
-        }
-        return os::filesize(fd_);
-    }
-
-    const filename_t &filename() const
-    {
-        return _filename;
-    }
-
-    static bool file_exists(const filename_t &fname)
-    {
-        return os::file_exists(fname);
-    }
+    void open(const filename_t &fname, bool truncate = false);
+    void reopen(bool truncate);
+    void flush();
+    void sync();
+    void close();
+    void write(const memory_buf_t &buf);
+    size_t size() const;
+    const filename_t &filename() const;
 
     //
     // return file path and its extension:
@@ -122,31 +44,18 @@ public:
     // ".mylog" => (".mylog". "")
     // "my_folder/.mylog" => ("my_folder/.mylog", "")
     // "my_folder/.mylog.txt" => ("my_folder/.mylog", ".txt")
-    static std::tuple<filename_t, filename_t> split_by_extenstion(const spdlog::filename_t &fname)
-    {
-        auto ext_index = fname.rfind('.');
-
-        // no valid extension found - return whole path and empty string as
-        // extension
-        if (ext_index == filename_t::npos || ext_index == 0 || ext_index == fname.size() - 1)
-        {
-            return std::make_tuple(fname, spdlog::filename_t());
-        }
-
-        // treat casese like "/etc/rc.d/somelogfile or "/abc/.hiddenfile"
-        auto folder_index = fname.rfind(details::os::folder_sep);
-        if (folder_index != filename_t::npos && folder_index >= ext_index - 1)
-        {
-            return std::make_tuple(fname, spdlog::filename_t());
-        }
-
-        // finally - return a valid base and extension tuple
-        return std::make_tuple(fname.substr(0, ext_index), fname.substr(ext_index));
-    }
+    static std::tuple<filename_t, filename_t> split_by_extension(const filename_t &fname);
 
 private:
+    const int open_tries_ = 5;
+    const unsigned int open_interval_ = 10;
     std::FILE *fd_{nullptr};
-    filename_t _filename;
+    filename_t filename_;
+    file_event_handlers event_handlers_;
 };
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "file_helper-inl.h"
+#endif

include/spdlog/details/fmt_helper.h

@@ -1,120 +1,134 @@
-//
-// Created by gabi on 6/15/18.
-//
-
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
 #pragma once
 
-#include "chrono"
-#include "spdlog/fmt/fmt.h"
+#include <chrono>
+#include <iterator>
+#include <spdlog/common.h>
+#include <spdlog/fmt/fmt.h>
+#include <type_traits>
+
+#ifdef SPDLOG_USE_STD_FORMAT
+    #include <charconv>
+    #include <limits>
+#endif
 
 // Some fmt helpers to efficiently format and pad ints and strings
 namespace spdlog {
 namespace details {
 namespace fmt_helper {
 
-template<size_t Buffer_Size>
-inline void append_str(const std::string &str, fmt::basic_memory_buffer<char, Buffer_Size> &dest)
-{
-    auto *str_ptr = str.data();
-    dest.append(str_ptr, str_ptr + str.size());
+inline void append_string_view(spdlog::string_view_t view, memory_buf_t &dest) {
+    auto *buf_ptr = view.data();
+    dest.append(buf_ptr, buf_ptr + view.size());
 }
 
-template<size_t Buffer_Size>
-inline void append_c_str(const char *c_str, fmt::basic_memory_buffer<char, Buffer_Size> &dest)
-{
-    auto len = std::char_traits<char>::length(c_str);
-    dest.append(c_str, c_str + len);
-}
+#ifdef SPDLOG_USE_STD_FORMAT
+template <typename T>
+inline void append_int(T n, memory_buf_t &dest) {
+    // Buffer should be large enough to hold all digits (digits10 + 1) and a sign
+    SPDLOG_CONSTEXPR const auto BUF_SIZE = std::numeric_limits<T>::digits10 + 2;
+    char buf[BUF_SIZE];
 
-template<size_t Buffer_Size1, size_t Buffer_Size2>
-inline void append_buf(const fmt::basic_memory_buffer<char, Buffer_Size1> &buf, fmt::basic_memory_buffer<char, Buffer_Size2> &dest)
-{
-    auto *buf_ptr = buf.data();
-    dest.append(buf_ptr, buf_ptr + buf.size());
+    auto [ptr, ec] = std::to_chars(buf, buf + BUF_SIZE, n, 10);
+    if (ec == std::errc()) {
+        dest.append(buf, ptr);
+    } else {
+        throw_spdlog_ex("Failed to format int", static_cast<int>(ec));
+    }
 }
-
-template<typename T, size_t Buffer_Size>
-inline void append_int(T n, fmt::basic_memory_buffer<char, Buffer_Size> &dest)
-{
+#else
+template <typename T>
+inline void append_int(T n, memory_buf_t &dest) {
     fmt::format_int i(n);
     dest.append(i.data(), i.data() + i.size());
 }
+#endif
 
-template<size_t Buffer_Size>
-inline void pad2(int n, fmt::basic_memory_buffer<char, Buffer_Size> &dest)
-{
-    if (n > 99)
-    {
-        append_int(n, dest);
-        return;
+template <typename T>
+SPDLOG_CONSTEXPR_FUNC unsigned int count_digits_fallback(T n) {
+    // taken from fmt: https://github.com/fmtlib/fmt/blob/8.0.1/include/fmt/format.h#L899-L912
+    unsigned int count = 1;
+    for (;;) {
+        // Integer division is slow so do it for a group of four digits instead
+        // of for every digit. The idea comes from the talk by Alexandrescu
+        // "Three Optimization Tips for C++". See speed-test for a comparison.
+        if (n < 10) return count;
+        if (n < 100) return count + 1;
+        if (n < 1000) return count + 2;
+        if (n < 10000) return count + 3;
+        n /= 10000u;
+        count += 4;
     }
-    if (n > 9) // 10-99
+}
+
+template <typename T>
+inline unsigned int count_digits(T n) {
+    using count_type =
+        typename std::conditional<(sizeof(T) > sizeof(uint32_t)), uint64_t, uint32_t>::type;
+#ifdef SPDLOG_USE_STD_FORMAT
+    return count_digits_fallback(static_cast<count_type>(n));
+#else
+    return static_cast<unsigned int>(fmt::
+    // fmt 7.0.0 renamed the internal namespace to detail.
+    // See: https://github.com/fmtlib/fmt/issues/1538
+    #if FMT_VERSION < 70000
+                                         internal
+    #else
+                                         detail
+    #endif
+                                     ::count_digits(static_cast<count_type>(n)));
+#endif
+}
+
+inline void pad2(int n, memory_buf_t &dest) {
+    if (n >= 0 && n < 100)  // 0-99
     {
         dest.push_back(static_cast<char>('0' + n / 10));
         dest.push_back(static_cast<char>('0' + n % 10));
-        return;
-    }
-    if (n >= 0) // 0-9
+    } else  // unlikely, but just in case, let fmt deal with it
     {
-        dest.push_back('0');
-        dest.push_back(static_cast<char>('0' + n));
-        return;
+        fmt_lib::format_to(std::back_inserter(dest), SPDLOG_FMT_STRING("{:02}"), n);
     }
-    // negatives (unlikely, but just in case, let fmt deal with it)
-    fmt::format_to(dest, "{:02}", n);
 }
 
-template<size_t Buffer_Size>
-inline void pad3(int n, fmt::basic_memory_buffer<char, Buffer_Size> &dest)
-{
-    if (n > 999)
-    {
-        append_int(n, dest);
-        return;
-    }
-
-    if (n > 99) // 100-999
-    {
-        dest.push_back(static_cast<char>('0' + n / 100));
-        pad2(n % 100, dest);
-        return;
-    }
-    if (n > 9) // 10-99
-    {
+template <typename T>
+inline void pad_uint(T n, unsigned int width, memory_buf_t &dest) {
+    static_assert(std::is_unsigned<T>::value, "pad_uint must get unsigned T");
+    for (auto digits = count_digits(n); digits < width; digits++) {
         dest.push_back('0');
-        dest.push_back(static_cast<char>('0' + n / 10));
-        dest.push_back(static_cast<char>('0' + n % 10));
-        return;
     }
-    if (n >= 0)
-    {
-        dest.push_back('0');
-        dest.push_back('0');
-        dest.push_back(static_cast<char>('0' + n));
-        return;
-    }
-    // negatives (unlikely, but just in case let fmt deal with it)
-    fmt::format_to(dest, "{:03}", n);
+    append_int(n, dest);
 }
 
-template<size_t Buffer_Size>
-inline void pad6(size_t n, fmt::basic_memory_buffer<char, Buffer_Size> &dest)
-{
-    if (n > 99999)
-    {
+template <typename T>
+inline void pad3(T n, memory_buf_t &dest) {
+    static_assert(std::is_unsigned<T>::value, "pad3 must get unsigned T");
+    if (n < 1000) {
+        dest.push_back(static_cast<char>(n / 100 + '0'));
+        n = n % 100;
+        dest.push_back(static_cast<char>((n / 10) + '0'));
+        dest.push_back(static_cast<char>((n % 10) + '0'));
+    } else {
         append_int(n, dest);
-        return;
     }
-    pad3(static_cast<int>(n / 1000), dest);
-    pad3(static_cast<int>(n % 1000), dest);
+}
+
+template <typename T>
+inline void pad6(T n, memory_buf_t &dest) {
+    pad_uint(n, 6, dest);
+}
+
+template <typename T>
+inline void pad9(T n, memory_buf_t &dest) {
+    pad_uint(n, 9, dest);
 }
 
 // return fraction of a second of the given time_point.
 // e.g.
 // fraction<std::milliseconds>(tp) -> will return the millis part of the second
-template<typename ToDuration>
-inline ToDuration time_fraction(const log_clock::time_point &tp)
-{
+template <typename ToDuration>
+inline ToDuration time_fraction(log_clock::time_point tp) {
     using std::chrono::duration_cast;
     using std::chrono::seconds;
     auto duration = tp.time_since_epoch();
@@ -122,6 +136,6 @@ inline ToDuration time_fraction(const log_clock::time_point &tp)
     return duration_cast<ToDuration>(duration) - duration_cast<ToDuration>(secs);
 }
 
-} // namespace fmt_helper
-} // namespace details
-} // namespace spdlog
+}  // namespace fmt_helper
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/log_msg-inl.h

@@ -0,0 +1,44 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/log_msg.h>
+#endif
+
+#include <spdlog/details/os.h>
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE log_msg::log_msg(spdlog::log_clock::time_point log_time,
+                               spdlog::source_loc loc,
+                               string_view_t a_logger_name,
+                               spdlog::level::level_enum lvl,
+                               spdlog::string_view_t msg)
+    : logger_name(a_logger_name),
+      level(lvl),
+      time(log_time)
+#ifndef SPDLOG_NO_THREAD_ID
+      ,
+      thread_id(os::thread_id())
+#endif
+      ,
+      source(loc),
+      payload(msg) {
+}
+
+SPDLOG_INLINE log_msg::log_msg(spdlog::source_loc loc,
+                               string_view_t a_logger_name,
+                               spdlog::level::level_enum lvl,
+                               spdlog::string_view_t msg)
+    : log_msg(os::now(), loc, a_logger_name, lvl, msg) {}
+
+SPDLOG_INLINE log_msg::log_msg(string_view_t a_logger_name,
+                               spdlog::level::level_enum lvl,
+                               spdlog::string_view_t msg)
+    : log_msg(os::now(), source_loc{}, a_logger_name, lvl, msg) {}
+
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/log_msg.h

@@ -1,49 +1,40 @@
-//
-// Copyright(c) 2015 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
-#include "spdlog/common.h"
-#include "spdlog/details/os.h"
-
+#include <spdlog/common.h>
 #include <string>
-#include <utility>
 
 namespace spdlog {
 namespace details {
-struct log_msg
-{
+struct SPDLOG_API log_msg {
     log_msg() = default;
+    log_msg(log_clock::time_point log_time,
+            source_loc loc,
+            string_view_t logger_name,
+            level::level_enum lvl,
+            string_view_t msg);
+    log_msg(source_loc loc, string_view_t logger_name, level::level_enum lvl, string_view_t msg);
+    log_msg(string_view_t logger_name, level::level_enum lvl, string_view_t msg);
+    log_msg(const log_msg &other) = default;
+    log_msg &operator=(const log_msg &other) = default;
 
-    log_msg(const std::string *loggers_name, level::level_enum lvl)
-        : logger_name(loggers_name)
-        , level(lvl)
-#ifndef SPDLOG_NO_DATETIME
-        , time(os::now())
-#endif
-
-#ifndef SPDLOG_NO_THREAD_ID
-        , thread_id(os::thread_id())
-#endif
-    {
-    }
-
-    log_msg(const log_msg &other) = delete;
-    log_msg(log_msg &&other) = delete;
-    log_msg &operator=(log_msg &&other) = delete;
-
-    const std::string *logger_name{nullptr};
-    level::level_enum level;
+    string_view_t logger_name;
+    level::level_enum level{level::off};
     log_clock::time_point time;
-    size_t thread_id;
-    fmt::memory_buffer raw;
-    size_t msg_id;
+    size_t thread_id{0};
 
-    // info about wrapping the formatted text with color (updated by pattern_formatter).
+    // wrapping the formatted text with color (updated by pattern_formatter).
     mutable size_t color_range_start{0};
     mutable size_t color_range_end{0};
+
+    source_loc source;
+    string_view_t payload;
 };
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "log_msg-inl.h"
+#endif

include/spdlog/details/log_msg_buffer-inl.h

@@ -0,0 +1,54 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/log_msg_buffer.h>
+#endif
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE log_msg_buffer::log_msg_buffer(const log_msg &orig_msg)
+    : log_msg{orig_msg} {
+    buffer.append(logger_name.begin(), logger_name.end());
+    buffer.append(payload.begin(), payload.end());
+    update_string_views();
+}
+
+SPDLOG_INLINE log_msg_buffer::log_msg_buffer(const log_msg_buffer &other)
+    : log_msg{other} {
+    buffer.append(logger_name.begin(), logger_name.end());
+    buffer.append(payload.begin(), payload.end());
+    update_string_views();
+}
+
+SPDLOG_INLINE log_msg_buffer::log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT
+    : log_msg{other},
+      buffer{std::move(other.buffer)} {
+    update_string_views();
+}
+
+SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(const log_msg_buffer &other) {
+    log_msg::operator=(other);
+    buffer.clear();
+    buffer.append(other.buffer.data(), other.buffer.data() + other.buffer.size());
+    update_string_views();
+    return *this;
+}
+
+SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(log_msg_buffer &&other) SPDLOG_NOEXCEPT {
+    log_msg::operator=(other);
+    buffer = std::move(other.buffer);
+    update_string_views();
+    return *this;
+}
+
+SPDLOG_INLINE void log_msg_buffer::update_string_views() {
+    logger_name = string_view_t{buffer.data(), logger_name.size()};
+    payload = string_view_t{buffer.data() + logger_name.size(), payload.size()};
+}
+
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/log_msg_buffer.h

@@ -0,0 +1,32 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/log_msg.h>
+
+namespace spdlog {
+namespace details {
+
+// Extend log_msg with internal buffer to store its payload.
+// This is needed since log_msg holds string_views that points to stack data.
+
+class SPDLOG_API log_msg_buffer : public log_msg {
+    memory_buf_t buffer;
+    void update_string_views();
+
+public:
+    log_msg_buffer() = default;
+    explicit log_msg_buffer(const log_msg &orig_msg);
+    log_msg_buffer(const log_msg_buffer &other);
+    log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT;
+    log_msg_buffer &operator=(const log_msg_buffer &other);
+    log_msg_buffer &operator=(log_msg_buffer &&other) SPDLOG_NOEXCEPT;
+};
+
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "log_msg_buffer-inl.h"
+#endif

include/spdlog/details/logger_impl.h

@@ -1,383 +0,0 @@
-//
-// Copyright(c) 2015 Gabi Melman.
-// Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
-
-#pragma once
-
-#include "spdlog/details/fmt_helper.h"
-
-#include <memory>
-#include <string>
-
-// create logger with given name, sinks and the default pattern formatter
-// all other ctors will call this one
-template<typename It>
-inline spdlog::logger::logger(std::string logger_name, It begin, It end)
-    : name_(std::move(logger_name))
-    , sinks_(begin, end)
-    , level_(level::info)
-    , flush_level_(level::off)
-    , last_err_time_(0)
-    , msg_counter_(1) // message counter will start from 1. 0-message id will be
-                      // reserved for controll messages
-{
-    err_handler_ = [this](const std::string &msg) { this->default_err_handler_(msg); };
-}
-
-// ctor with sinks as init list
-inline spdlog::logger::logger(std::string logger_name, sinks_init_list sinks_list)
-    : logger(std::move(logger_name), sinks_list.begin(), sinks_list.end())
-{
-}
-
-// ctor with single sink
-inline spdlog::logger::logger(std::string logger_name, spdlog::sink_ptr single_sink)
-    : logger(std::move(logger_name), {std::move(single_sink)})
-{
-}
-
-inline spdlog::logger::~logger() = default;
-
-inline void spdlog::logger::set_formatter(std::unique_ptr<spdlog::formatter> f)
-{
-    for (auto &sink : sinks_)
-    {
-        sink->set_formatter(f->clone());
-    }
-}
-
-inline void spdlog::logger::set_pattern(std::string pattern, pattern_time_type time_type)
-{
-    auto new_formatter = details::make_unique<spdlog::pattern_formatter>(std::move(pattern), time_type);
-    set_formatter(std::move(new_formatter));
-}
-
-template<typename... Args>
-inline void spdlog::logger::log(level::level_enum lvl, const char *fmt, const Args &... args)
-{
-    if (!should_log(lvl))
-    {
-        return;
-    }
-
-    try
-    {
-        details::log_msg log_msg(&name_, lvl);
-        fmt::format_to(log_msg.raw, fmt, args...);
-        sink_it_(log_msg);
-    }
-    SPDLOG_CATCH_AND_HANDLE
-}
-
-template<typename... Args>
-inline void spdlog::logger::log(level::level_enum lvl, const char *msg)
-{
-    if (!should_log(lvl))
-    {
-        return;
-    }
-    try
-    {
-        details::log_msg log_msg(&name_, lvl);
-        details::fmt_helper::append_c_str(msg, log_msg.raw);
-        sink_it_(log_msg);
-    }
-    SPDLOG_CATCH_AND_HANDLE
-}
-
-template<typename T>
-inline void spdlog::logger::log(level::level_enum lvl, const T &msg)
-{
-    if (!should_log(lvl))
-    {
-        return;
-    }
-    try
-    {
-        details::log_msg log_msg(&name_, lvl);
-        fmt::format_to(log_msg.raw, "{}", msg);
-        sink_it_(log_msg);
-    }
-    SPDLOG_CATCH_AND_HANDLE
-}
-
-template<typename... Args>
-inline void spdlog::logger::trace(const char *fmt, const Args &... args)
-{
-    log(level::trace, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::debug(const char *fmt, const Args &... args)
-{
-    log(level::debug, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::info(const char *fmt, const Args &... args)
-{
-    log(level::info, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::warn(const char *fmt, const Args &... args)
-{
-    log(level::warn, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::error(const char *fmt, const Args &... args)
-{
-    log(level::err, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::critical(const char *fmt, const Args &... args)
-{
-    log(level::critical, fmt, args...);
-}
-
-template<typename T>
-inline void spdlog::logger::trace(const T &msg)
-{
-    log(level::trace, msg);
-}
-
-template<typename T>
-inline void spdlog::logger::debug(const T &msg)
-{
-    log(level::debug, msg);
-}
-
-template<typename T>
-inline void spdlog::logger::info(const T &msg)
-{
-    log(level::info, msg);
-}
-
-template<typename T>
-inline void spdlog::logger::warn(const T &msg)
-{
-    log(level::warn, msg);
-}
-
-template<typename T>
-inline void spdlog::logger::error(const T &msg)
-{
-    log(level::err, msg);
-}
-
-template<typename T>
-inline void spdlog::logger::critical(const T &msg)
-{
-    log(level::critical, msg);
-}
-
-#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
-
-inline void wbuf_to_utf8buf(const fmt::wmemory_buffer &wbuf, fmt::memory_buffer &target)
-{
-    int wbuf_size = static_cast<int>(wbuf.size());
-    if (wbuf_size == 0)
-    {
-        return;
-    }
-
-    auto result_size = ::WideCharToMultiByte(CP_UTF8, 0, wbuf.data(), wbuf_size, NULL, 0, NULL, NULL);
-
-    if (result_size > 0)
-    {
-        target.resize(result_size);
-        ::WideCharToMultiByte(CP_UTF8, 0, wbuf.data(), wbuf_size, &target.data()[0], result_size, NULL, NULL);
-    }
-    else
-    {
-        throw spdlog::spdlog_ex(fmt::format("WideCharToMultiByte failed. Last error: {}", ::GetLastError()));
-    }
-}
-
-template<typename... Args>
-inline void spdlog::logger::log(level::level_enum lvl, const wchar_t *fmt, const Args &... args)
-{
-    if (!should_log(lvl))
-    {
-        return;
-    }
-
-    try
-    {
-        // format to wmemory_buffer and convert to utf8
-        details::log_msg log_msg(&name_, lvl);
-        fmt::wmemory_buffer wbuf;
-        fmt::format_to(wbuf, fmt, args...);
-        wbuf_to_utf8buf(wbuf, log_msg.raw);
-        sink_it_(log_msg);
-    }
-    SPDLOG_CATCH_AND_HANDLE
-}
-
-template<typename... Args>
-inline void spdlog::logger::trace(const wchar_t *fmt, const Args &... args)
-{
-    log(level::trace, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::debug(const wchar_t *fmt, const Args &... args)
-{
-    log(level::debug, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::info(const wchar_t *fmt, const Args &... args)
-{
-    log(level::info, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::warn(const wchar_t *fmt, const Args &... args)
-{
-    log(level::warn, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::error(const wchar_t *fmt, const Args &... args)
-{
-    log(level::err, fmt, args...);
-}
-
-template<typename... Args>
-inline void spdlog::logger::critical(const wchar_t *fmt, const Args &... args)
-{
-    log(level::critical, fmt, args...);
-}
-
-#endif // SPDLOG_WCHAR_TO_UTF8_SUPPORT
-
-//
-// name and level
-//
-inline const std::string &spdlog::logger::name() const
-{
-    return name_;
-}
-
-inline void spdlog::logger::set_level(spdlog::level::level_enum log_level)
-{
-    level_.store(log_level);
-}
-
-inline void spdlog::logger::set_error_handler(spdlog::log_err_handler err_handler)
-{
-    err_handler_ = std::move(err_handler);
-}
-
-inline spdlog::log_err_handler spdlog::logger::error_handler()
-{
-    return err_handler_;
-}
-
-inline void spdlog::logger::flush()
-{
-    try
-    {
-        flush_();
-    }
-    SPDLOG_CATCH_AND_HANDLE
-}
-
-inline void spdlog::logger::flush_on(level::level_enum log_level)
-{
-    flush_level_.store(log_level);
-}
-
-inline spdlog::level::level_enum spdlog::logger::flush_level() const
-{
-    return static_cast<spdlog::level::level_enum>(flush_level_.load(std::memory_order_relaxed));
-}
-
-inline bool spdlog::logger::should_flush_(const details::log_msg &msg)
-{
-    auto flush_level = flush_level_.load(std::memory_order_relaxed);
-    return (msg.level >= flush_level) && (msg.level != level::off);
-}
-
-inline spdlog::level::level_enum spdlog::logger::level() const
-{
-    return static_cast<spdlog::level::level_enum>(level_.load(std::memory_order_relaxed));
-}
-
-inline bool spdlog::logger::should_log(spdlog::level::level_enum msg_level) const
-{
-    return msg_level >= level_.load(std::memory_order_relaxed);
-}
-
-//
-// protected virtual called at end of each user log call (if enabled) by the
-// line_logger
-//
-inline void spdlog::logger::sink_it_(details::log_msg &msg)
-{
-#if defined(SPDLOG_ENABLE_MESSAGE_COUNTER)
-    incr_msg_counter_(msg);
-#endif
-    for (auto &sink : sinks_)
-    {
-        if (sink->should_log(msg.level))
-        {
-            sink->log(msg);
-        }
-    }
-
-    if (should_flush_(msg))
-    {
-        flush();
-    }
-}
-
-inline void spdlog::logger::flush_()
-{
-    for (auto &sink : sinks_)
-    {
-        sink->flush();
-    }
-}
-
-inline void spdlog::logger::default_err_handler_(const std::string &msg)
-{
-    auto now = time(nullptr);
-    if (now - last_err_time_ < 60)
-    {
-        return;
-    }
-    last_err_time_ = now;
-    auto tm_time = details::os::localtime(now);
-    char date_buf[100];
-    std::strftime(date_buf, sizeof(date_buf), "%Y-%m-%d %H:%M:%S", &tm_time);
-    fmt::print(stderr, "[*** LOG ERROR ***] [{}] [{}] {}\n", date_buf, name(), msg);
-}
-
-inline void spdlog::logger::incr_msg_counter_(details::log_msg &msg)
-{
-    msg.msg_id = msg_counter_.fetch_add(1, std::memory_order_relaxed);
-}
-
-inline const std::vector<spdlog::sink_ptr> &spdlog::logger::sinks() const
-{
-    return sinks_;
-}
-
-inline std::vector<spdlog::sink_ptr> &spdlog::logger::sinks()
-{
-    return sinks_;
-}
-
-inline std::shared_ptr<spdlog::logger> spdlog::logger::clone(std::string logger_name)
-{
-    auto cloned = std::make_shared<spdlog::logger>(std::move(logger_name), sinks_.begin(), sinks_.end());
-    cloned->set_level(this->level());
-    cloned->flush_on(this->flush_level());
-    cloned->set_error_handler(this->error_handler());
-    return cloned;
-}

include/spdlog/details/mpmc_blocking_q.h

@@ -1,9 +1,7 @@
-#pragma once
-
-//
-// Copyright(c) 2018 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
+
+#pragma once
 
 // multi producer-multi consumer blocking queue.
 // enqueue(..) - will block until room found to put the new message.
@@ -12,28 +10,25 @@
 // dequeue_for(..) - will block until the queue is not empty or timeout have
 // passed.
 
-#include "spdlog/details/circular_q.h"
+#include <spdlog/details/circular_q.h>
 
+#include <atomic>
 #include <condition_variable>
 #include <mutex>
 
 namespace spdlog {
 namespace details {
 
-template<typename T>
-class mpmc_blocking_queue
-{
+template <typename T>
+class mpmc_blocking_queue {
 public:
     using item_type = T;
     explicit mpmc_blocking_queue(size_t max_items)
-        : q_(max_items)
-    {
-    }
+        : q_(max_items) {}
 
 #ifndef __MINGW32__
     // try to enqueue and block if no room left
-    void enqueue(T &&item)
-    {
+    void enqueue(T &&item) {
         {
             std::unique_lock<std::mutex> lock(queue_mutex_);
             pop_cv_.wait(lock, [this] { return !this->q_.full(); });
@@ -43,8 +38,7 @@ public:
     }
 
     // enqueue immediately. overrun oldest message in the queue if no room left.
-    void enqueue_nowait(T &&item)
-    {
+    void enqueue_nowait(T &&item) {
         {
             std::unique_lock<std::mutex> lock(queue_mutex_);
             q_.push_back(std::move(item));
@@ -52,29 +46,55 @@ public:
         push_cv_.notify_one();
     }
 
-    // try to dequeue item. if no item found. wait upto timeout and try again
-    // Return true, if succeeded dequeue item, false otherwise
-    bool dequeue_for(T &popped_item, std::chrono::milliseconds wait_duration)
-    {
+    void enqueue_if_have_room(T &&item) {
+        bool pushed = false;
         {
             std::unique_lock<std::mutex> lock(queue_mutex_);
-            if (!push_cv_.wait_for(lock, wait_duration, [this] { return !this->q_.empty(); }))
-            {
+            if (!q_.full()) {
+                q_.push_back(std::move(item));
+                pushed = true;
+            }
+        }
+
+        if (pushed) {
+            push_cv_.notify_one();
+        } else {
+            ++discard_counter_;
+        }
+    }
+
+    // dequeue with a timeout.
+    // Return true, if succeeded dequeue item, false otherwise
+    bool dequeue_for(T &popped_item, std::chrono::milliseconds wait_duration) {
+        {
+            std::unique_lock<std::mutex> lock(queue_mutex_);
+            if (!push_cv_.wait_for(lock, wait_duration, [this] { return !this->q_.empty(); })) {
                 return false;
             }
-            q_.pop_front(popped_item);
+            popped_item = std::move(q_.front());
+            q_.pop_front();
         }
         pop_cv_.notify_one();
         return true;
     }
 
+    // blocking dequeue without a timeout.
+    void dequeue(T &popped_item) {
+        {
+            std::unique_lock<std::mutex> lock(queue_mutex_);
+            push_cv_.wait(lock, [this] { return !this->q_.empty(); });
+            popped_item = std::move(q_.front());
+            q_.pop_front();
+        }
+        pop_cv_.notify_one();
+    }
+
 #else
     // apparently mingw deadlocks if the mutex is released before cv.notify_one(),
     // so release the mutex at the very end each function.
 
     // try to enqueue and block if no room left
-    void enqueue(T &&item)
-    {
+    void enqueue(T &&item) {
         std::unique_lock<std::mutex> lock(queue_mutex_);
         pop_cv_.wait(lock, [this] { return !this->q_.full(); });
         q_.push_back(std::move(item));
@@ -82,40 +102,76 @@ public:
     }
 
     // enqueue immediately. overrun oldest message in the queue if no room left.
-    void enqueue_nowait(T &&item)
-    {
+    void enqueue_nowait(T &&item) {
         std::unique_lock<std::mutex> lock(queue_mutex_);
         q_.push_back(std::move(item));
         push_cv_.notify_one();
     }
 
-    // try to dequeue item. if no item found. wait upto timeout and try again
-    // Return true, if succeeded dequeue item, false otherwise
-    bool dequeue_for(T &popped_item, std::chrono::milliseconds wait_duration)
-    {
+    void enqueue_if_have_room(T &&item) {
+        bool pushed = false;
         std::unique_lock<std::mutex> lock(queue_mutex_);
-        if (!push_cv_.wait_for(lock, wait_duration, [this] { return !this->q_.empty(); }))
-        {
+        if (!q_.full()) {
+            q_.push_back(std::move(item));
+            pushed = true;
+        }
+
+        if (pushed) {
+            push_cv_.notify_one();
+        } else {
+            ++discard_counter_;
+        }
+    }
+
+    // dequeue with a timeout.
+    // Return true, if succeeded dequeue item, false otherwise
+    bool dequeue_for(T &popped_item, std::chrono::milliseconds wait_duration) {
+        std::unique_lock<std::mutex> lock(queue_mutex_);
+        if (!push_cv_.wait_for(lock, wait_duration, [this] { return !this->q_.empty(); })) {
             return false;
         }
-        q_.pop_front(popped_item);
+        popped_item = std::move(q_.front());
+        q_.pop_front();
         pop_cv_.notify_one();
         return true;
     }
 
+    // blocking dequeue without a timeout.
+    void dequeue(T &popped_item) {
+        std::unique_lock<std::mutex> lock(queue_mutex_);
+        push_cv_.wait(lock, [this] { return !this->q_.empty(); });
+        popped_item = std::move(q_.front());
+        q_.pop_front();
+        pop_cv_.notify_one();
+    }
+
 #endif
 
-    size_t overrun_counter()
-    {
-        std::unique_lock<std::mutex> lock(queue_mutex_);
+    size_t overrun_counter() {
+        std::lock_guard<std::mutex> lock(queue_mutex_);
         return q_.overrun_counter();
     }
 
+    size_t discard_counter() { return discard_counter_.load(std::memory_order_relaxed); }
+
+    size_t size() {
+        std::lock_guard<std::mutex> lock(queue_mutex_);
+        return q_.size();
+    }
+
+    void reset_overrun_counter() {
+        std::lock_guard<std::mutex> lock(queue_mutex_);
+        q_.reset_overrun_counter();
+    }
+
+    void reset_discard_counter() { discard_counter_.store(0, std::memory_order_relaxed); }
+
 private:
     std::mutex queue_mutex_;
     std::condition_variable push_cv_;
     std::condition_variable pop_cv_;
     spdlog::details::circular_q<T> q_;
+    std::atomic<size_t> discard_counter_{0};
 };
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/null_mutex.h

@@ -1,45 +1,35 @@
-//
-// Copyright(c) 2015 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
 #include <atomic>
+#include <utility>
 // null, no cost dummy "mutex" and dummy "atomic" int
 
 namespace spdlog {
 namespace details {
-struct null_mutex
-{
-    void lock() {}
-    void unlock() {}
-    bool try_lock()
-    {
-        return true;
-    }
+struct null_mutex {
+    void lock() const {}
+    void unlock() const {}
 };
 
-struct null_atomic_int
-{
+struct null_atomic_int {
     int value;
     null_atomic_int() = default;
 
-    explicit null_atomic_int(int val)
-        : value(val)
-    {
-    }
+    explicit null_atomic_int(int new_value)
+        : value(new_value) {}
 
-    int load(std::memory_order) const
-    {
-        return value;
-    }
+    int load(std::memory_order = std::memory_order_relaxed) const { return value; }
 
-    void store(int val)
-    {
-        value = val;
+    void store(int new_value, std::memory_order = std::memory_order_relaxed) { value = new_value; }
+
+    int exchange(int new_value, std::memory_order = std::memory_order_relaxed) {
+        std::swap(new_value, value);
+        return new_value;  // return value before the call
     }
 };
 
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/os-inl.h

@@ -0,0 +1,606 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/os.h>
+#endif
+
+#include <spdlog/common.h>
+
+#include <algorithm>
+#include <array>
+#include <chrono>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+#include <string>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <thread>
+
+#ifdef _WIN32
+    #include <spdlog/details/windows_include.h>
+    #include <fileapi.h>  // for FlushFileBuffers
+    #include <io.h>       // for _get_osfhandle, _isatty, _fileno
+    #include <process.h>  // for _get_pid
+
+    #ifdef __MINGW32__
+        #include <share.h>
+    #endif
+
+    #if defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)
+        #include <cassert>
+        #include <limits>
+    #endif
+
+    #include <direct.h>  // for _mkdir/_wmkdir
+
+#else  // unix
+
+    #include <fcntl.h>
+    #include <unistd.h>
+
+    #ifdef __linux__
+        #include <sys/syscall.h>  //Use gettid() syscall under linux to get thread id
+
+    #elif defined(_AIX)
+        #include <pthread.h>  // for pthread_getthrds_np
+
+    #elif defined(__DragonFly__) || defined(__FreeBSD__)
+        #include <pthread_np.h>  // for pthread_getthreadid_np
+
+    #elif defined(__NetBSD__)
+        #include <lwp.h>  // for _lwp_self
+
+    #elif defined(__sun)
+        #include <thread.h>  // for thr_self
+    #endif
+
+#endif  // unix
+
+#if defined __APPLE__
+    #include <AvailabilityMacros.h>
+#endif
+
+#ifndef __has_feature           // Clang - feature checking macros.
+    #define __has_feature(x) 0  // Compatibility with non-clang compilers.
+#endif
+
+namespace spdlog {
+namespace details {
+namespace os {
+
+SPDLOG_INLINE spdlog::log_clock::time_point now() SPDLOG_NOEXCEPT {
+#if defined __linux__ && defined SPDLOG_CLOCK_COARSE
+    timespec ts;
+    ::clock_gettime(CLOCK_REALTIME_COARSE, &ts);
+    return std::chrono::time_point<log_clock, typename log_clock::duration>(
+        std::chrono::duration_cast<typename log_clock::duration>(
+            std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec)));
+
+#else
+    return log_clock::now();
+#endif
+}
+SPDLOG_INLINE std::tm localtime(const std::time_t &time_tt) SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    std::tm tm;
+    ::localtime_s(&tm, &time_tt);
+#else
+    std::tm tm;
+    ::localtime_r(&time_tt, &tm);
+#endif
+    return tm;
+}
+
+SPDLOG_INLINE std::tm localtime() SPDLOG_NOEXCEPT {
+    std::time_t now_t = ::time(nullptr);
+    return localtime(now_t);
+}
+
+SPDLOG_INLINE std::tm gmtime(const std::time_t &time_tt) SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    std::tm tm;
+    ::gmtime_s(&tm, &time_tt);
+#else
+    std::tm tm;
+    ::gmtime_r(&time_tt, &tm);
+#endif
+    return tm;
+}
+
+SPDLOG_INLINE std::tm gmtime() SPDLOG_NOEXCEPT {
+    std::time_t now_t = ::time(nullptr);
+    return gmtime(now_t);
+}
+
+// fopen_s on non windows for writing
+SPDLOG_INLINE bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode) {
+#ifdef _WIN32
+    #ifdef SPDLOG_WCHAR_FILENAMES
+    *fp = ::_wfsopen((filename.c_str()), mode.c_str(), _SH_DENYNO);
+    #else
+    *fp = ::_fsopen((filename.c_str()), mode.c_str(), _SH_DENYNO);
+    #endif
+    #if defined(SPDLOG_PREVENT_CHILD_FD)
+    if (*fp != nullptr) {
+        auto file_handle = reinterpret_cast<HANDLE>(_get_osfhandle(::_fileno(*fp)));
+        if (!::SetHandleInformation(file_handle, HANDLE_FLAG_INHERIT, 0)) {
+            ::fclose(*fp);
+            *fp = nullptr;
+        }
+    }
+    #endif
+#else  // unix
+    #if defined(SPDLOG_PREVENT_CHILD_FD)
+    const int mode_flag = mode == SPDLOG_FILENAME_T("ab") ? O_APPEND : O_TRUNC;
+    const int fd =
+        ::open((filename.c_str()), O_CREAT | O_WRONLY | O_CLOEXEC | mode_flag, mode_t(0644));
+    if (fd == -1) {
+        return true;
+    }
+    *fp = ::fdopen(fd, mode.c_str());
+    if (*fp == nullptr) {
+        ::close(fd);
+    }
+    #else
+    *fp = ::fopen((filename.c_str()), mode.c_str());
+    #endif
+#endif
+
+    return *fp == nullptr;
+}
+
+SPDLOG_INLINE int remove(const filename_t &filename) SPDLOG_NOEXCEPT {
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+    return ::_wremove(filename.c_str());
+#else
+    return std::remove(filename.c_str());
+#endif
+}
+
+SPDLOG_INLINE int remove_if_exists(const filename_t &filename) SPDLOG_NOEXCEPT {
+    return path_exists(filename) ? remove(filename) : 0;
+}
+
+SPDLOG_INLINE int rename(const filename_t &filename1, const filename_t &filename2) SPDLOG_NOEXCEPT {
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+    return ::_wrename(filename1.c_str(), filename2.c_str());
+#else
+    return std::rename(filename1.c_str(), filename2.c_str());
+#endif
+}
+
+// Return true if path exists (file or directory)
+SPDLOG_INLINE bool path_exists(const filename_t &filename) SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    struct _stat buffer;
+    #ifdef SPDLOG_WCHAR_FILENAMES
+    return (::_wstat(filename.c_str(), &buffer) == 0);
+    #else
+    return (::_stat(filename.c_str(), &buffer) == 0);
+    #endif
+#else  // common linux/unix all have the stat system call
+    struct stat buffer;
+    return (::stat(filename.c_str(), &buffer) == 0);
+#endif
+}
+
+#ifdef _MSC_VER
+    // avoid warning about unreachable statement at the end of filesize()
+    #pragma warning(push)
+    #pragma warning(disable : 4702)
+#endif
+
+// Return file size according to open FILE* object
+SPDLOG_INLINE size_t filesize(FILE *f) {
+    if (f == nullptr) {
+        throw_spdlog_ex("Failed getting file size. fd is null");
+    }
+#if defined(_WIN32) && !defined(__CYGWIN__)
+    int fd = ::_fileno(f);
+    #if defined(_WIN64)  // 64 bits
+    __int64 ret = ::_filelengthi64(fd);
+    if (ret >= 0) {
+        return static_cast<size_t>(ret);
+    }
+
+    #else  // windows 32 bits
+    long ret = ::_filelength(fd);
+    if (ret >= 0) {
+        return static_cast<size_t>(ret);
+    }
+    #endif
+
+#else  // unix
+    // OpenBSD and AIX doesn't compile with :: before the fileno(..)
+    #if defined(__OpenBSD__) || defined(_AIX)
+    int fd = fileno(f);
+    #else
+    int fd = ::fileno(f);
+    #endif
+    // 64 bits(but not in osx, linux/musl or cygwin, where fstat64 is deprecated)
+    #if ((defined(__linux__) && defined(__GLIBC__)) || defined(__sun) || defined(_AIX)) && \
+        (defined(__LP64__) || defined(_LP64))
+    struct stat64 st;
+    if (::fstat64(fd, &st) == 0) {
+        return static_cast<size_t>(st.st_size);
+    }
+    #else  // other unix or linux 32 bits or cygwin
+    struct stat st;
+    if (::fstat(fd, &st) == 0) {
+        return static_cast<size_t>(st.st_size);
+    }
+    #endif
+#endif
+    throw_spdlog_ex("Failed getting file size from fd", errno);
+    return 0;  // will not be reached.
+}
+
+#ifdef _MSC_VER
+    #pragma warning(pop)
+#endif
+
+// Return utc offset in minutes or throw spdlog_ex on failure
+SPDLOG_INLINE int utc_minutes_offset(const std::tm &tm) {
+#ifdef _WIN32
+    #if _WIN32_WINNT < _WIN32_WINNT_WS08
+    TIME_ZONE_INFORMATION tzinfo;
+    auto rv = ::GetTimeZoneInformation(&tzinfo);
+    #else
+    DYNAMIC_TIME_ZONE_INFORMATION tzinfo;
+    auto rv = ::GetDynamicTimeZoneInformation(&tzinfo);
+    #endif
+    if (rv == TIME_ZONE_ID_INVALID) throw_spdlog_ex("Failed getting timezone info. ", errno);
+
+    int offset = -tzinfo.Bias;
+    if (tm.tm_isdst) {
+        offset -= tzinfo.DaylightBias;
+    } else {
+        offset -= tzinfo.StandardBias;
+    }
+    return offset;
+#else
+
+    #if defined(sun) || defined(__sun) || defined(_AIX) ||                        \
+        (defined(__NEWLIB__) && !defined(__TM_GMTOFF)) ||                         \
+        (!defined(__APPLE__) && !defined(_BSD_SOURCE) && !defined(_GNU_SOURCE) && \
+         (!defined(_POSIX_VERSION) || (_POSIX_VERSION < 202405L)))
+    // 'tm_gmtoff' field is BSD extension and it's missing on SunOS/Solaris
+    struct helper {
+        static long int calculate_gmt_offset(const std::tm &localtm = details::os::localtime(),
+                                             const std::tm &gmtm = details::os::gmtime()) {
+            int local_year = localtm.tm_year + (1900 - 1);
+            int gmt_year = gmtm.tm_year + (1900 - 1);
+
+            long int days = (
+                // difference in day of year
+                localtm.tm_yday -
+                gmtm.tm_yday
+
+                // + intervening leap days
+                + ((local_year >> 2) - (gmt_year >> 2)) - (local_year / 100 - gmt_year / 100) +
+                ((local_year / 100 >> 2) - (gmt_year / 100 >> 2))
+
+                // + difference in years * 365 */
+                + static_cast<long int>(local_year - gmt_year) * 365);
+
+            long int hours = (24 * days) + (localtm.tm_hour - gmtm.tm_hour);
+            long int mins = (60 * hours) + (localtm.tm_min - gmtm.tm_min);
+            long int secs = (60 * mins) + (localtm.tm_sec - gmtm.tm_sec);
+
+            return secs;
+        }
+    };
+
+    auto offset_seconds = helper::calculate_gmt_offset(tm);
+    #else
+    auto offset_seconds = tm.tm_gmtoff;
+    #endif
+
+    return static_cast<int>(offset_seconds / 60);
+#endif
+}
+
+// Return current thread id as size_t
+// It exists because the std::this_thread::get_id() is much slower(especially
+// under VS 2013)
+SPDLOG_INLINE size_t _thread_id() SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    return static_cast<size_t>(::GetCurrentThreadId());
+#elif defined(__linux__)
+    #if defined(__ANDROID__) && defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
+        #define SYS_gettid __NR_gettid
+    #endif
+    return static_cast<size_t>(::syscall(SYS_gettid));
+#elif defined(_AIX)
+    struct __pthrdsinfo buf;
+    int reg_size = 0;
+    pthread_t pt = pthread_self();
+    int retval = pthread_getthrds_np(&pt, PTHRDSINFO_QUERY_TID, &buf, sizeof(buf), NULL, &reg_size);
+    int tid = (!retval) ? buf.__pi_tid : 0;
+    return static_cast<size_t>(tid);
+#elif defined(__DragonFly__) || defined(__FreeBSD__)
+    return static_cast<size_t>(::pthread_getthreadid_np());
+#elif defined(__NetBSD__)
+    return static_cast<size_t>(::_lwp_self());
+#elif defined(__OpenBSD__)
+    return static_cast<size_t>(::getthrid());
+#elif defined(__sun)
+    return static_cast<size_t>(::thr_self());
+#elif __APPLE__
+    uint64_t tid;
+    // There is no pthread_threadid_np prior to Mac OS X 10.6, and it is not supported on any PPC,
+    // including 10.6.8 Rosetta. __POWERPC__ is Apple-specific define encompassing ppc and ppc64.
+    #ifdef MAC_OS_X_VERSION_MAX_ALLOWED
+    {
+        #if (MAC_OS_X_VERSION_MAX_ALLOWED < 1060) || defined(__POWERPC__)
+        tid = pthread_mach_thread_np(pthread_self());
+        #elif MAC_OS_X_VERSION_MIN_REQUIRED < 1060
+        if (&pthread_threadid_np) {
+            pthread_threadid_np(nullptr, &tid);
+        } else {
+            tid = pthread_mach_thread_np(pthread_self());
+        }
+        #else
+        pthread_threadid_np(nullptr, &tid);
+        #endif
+    }
+    #else
+    pthread_threadid_np(nullptr, &tid);
+    #endif
+    return static_cast<size_t>(tid);
+#else  // Default to standard C++11 (other Unix)
+    return static_cast<size_t>(std::hash<std::thread::id>()(std::this_thread::get_id()));
+#endif
+}
+
+// Return current thread id as size_t (from thread local storage)
+SPDLOG_INLINE size_t thread_id() SPDLOG_NOEXCEPT {
+#if defined(SPDLOG_NO_TLS)
+    return _thread_id();
+#else  // cache thread id in tls
+    static thread_local const size_t tid = _thread_id();
+    return tid;
+#endif
+}
+
+// This is avoid msvc issue in sleep_for that happens if the clock changes.
+// See https://github.com/gabime/spdlog/issues/609
+SPDLOG_INLINE void sleep_for_millis(unsigned int milliseconds) SPDLOG_NOEXCEPT {
+#if defined(_WIN32)
+    ::Sleep(milliseconds);
+#else
+    std::this_thread::sleep_for(std::chrono::milliseconds(milliseconds));
+#endif
+}
+
+// wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+SPDLOG_INLINE std::string filename_to_str(const filename_t &filename) {
+    memory_buf_t buf;
+    wstr_to_utf8buf(filename, buf);
+    return SPDLOG_BUF_TO_STRING(buf);
+}
+#else
+SPDLOG_INLINE std::string filename_to_str(const filename_t &filename) { return filename; }
+#endif
+
+SPDLOG_INLINE int pid() SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    return conditional_static_cast<int>(::GetCurrentProcessId());
+#else
+    return conditional_static_cast<int>(::getpid());
+#endif
+}
+
+// Determine if the terminal supports colors
+// Based on: https://github.com/agauniyal/rang/
+SPDLOG_INLINE bool is_color_terminal() SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    return true;
+#else
+
+    static const bool result = []() {
+        const char *env_colorterm_p = std::getenv("COLORTERM");
+        if (env_colorterm_p != nullptr) {
+            return true;
+        }
+
+        static constexpr std::array<const char *, 16> terms = {
+            {"ansi", "color", "console", "cygwin", "gnome", "konsole", "kterm", "linux", "msys",
+             "putty", "rxvt", "screen", "vt100", "xterm", "alacritty", "vt102"}};
+
+        const char *env_term_p = std::getenv("TERM");
+        if (env_term_p == nullptr) {
+            return false;
+        }
+
+        return std::any_of(terms.begin(), terms.end(), [&](const char *term) {
+            return std::strstr(env_term_p, term) != nullptr;
+        });
+    }();
+
+    return result;
+#endif
+}
+
+// Determine if the terminal attached
+// Source: https://github.com/agauniyal/rang/
+SPDLOG_INLINE bool in_terminal(FILE *file) SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    return ::_isatty(_fileno(file)) != 0;
+#else
+    return ::isatty(fileno(file)) != 0;
+#endif
+}
+
+#if (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) && defined(_WIN32)
+SPDLOG_INLINE void wstr_to_utf8buf(wstring_view_t wstr, memory_buf_t &target) {
+    if (wstr.size() > static_cast<size_t>((std::numeric_limits<int>::max)()) / 4 - 1) {
+        throw_spdlog_ex("UTF-16 string is too big to be converted to UTF-8");
+    }
+
+    int wstr_size = static_cast<int>(wstr.size());
+    if (wstr_size == 0) {
+        target.resize(0);
+        return;
+    }
+
+    int result_size = static_cast<int>(target.capacity());
+    if ((wstr_size + 1) * 4 > result_size) {
+        result_size =
+            ::WideCharToMultiByte(CP_UTF8, 0, wstr.data(), wstr_size, NULL, 0, NULL, NULL);
+    }
+
+    if (result_size > 0) {
+        target.resize(result_size);
+        result_size = ::WideCharToMultiByte(CP_UTF8, 0, wstr.data(), wstr_size, target.data(),
+                                            result_size, NULL, NULL);
+
+        if (result_size > 0) {
+            target.resize(result_size);
+            return;
+        }
+    }
+
+    throw_spdlog_ex(
+        fmt_lib::format("WideCharToMultiByte failed. Last error: {}", ::GetLastError()));
+}
+
+SPDLOG_INLINE void utf8_to_wstrbuf(string_view_t str, wmemory_buf_t &target) {
+    if (str.size() > static_cast<size_t>((std::numeric_limits<int>::max)()) - 1) {
+        throw_spdlog_ex("UTF-8 string is too big to be converted to UTF-16");
+    }
+
+    int str_size = static_cast<int>(str.size());
+    if (str_size == 0) {
+        target.resize(0);
+        return;
+    }
+
+    // find the size to allocate for the result buffer
+    int result_size = ::MultiByteToWideChar(CP_UTF8, 0, str.data(), str_size, NULL, 0);
+
+    if (result_size > 0) {
+        target.resize(result_size);
+        result_size =
+            ::MultiByteToWideChar(CP_UTF8, 0, str.data(), str_size, target.data(), result_size);
+        if (result_size > 0) {
+            assert(result_size == target.size());
+            return;
+        }
+    }
+
+    throw_spdlog_ex(
+        fmt_lib::format("MultiByteToWideChar failed. Last error: {}", ::GetLastError()));
+}
+#endif  // (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) &&
+        // defined(_WIN32)
+
+// return true on success
+static SPDLOG_INLINE bool mkdir_(const filename_t &path) {
+#ifdef _WIN32
+    #ifdef SPDLOG_WCHAR_FILENAMES
+    return ::_wmkdir(path.c_str()) == 0;
+    #else
+    return ::_mkdir(path.c_str()) == 0;
+    #endif
+#else
+    return ::mkdir(path.c_str(), mode_t(0755)) == 0;
+#endif
+}
+
+// create the given directory - and all directories leading to it
+// return true on success or if the directory already exists
+SPDLOG_INLINE bool create_dir(const filename_t &path) {
+    if (path_exists(path)) {
+        return true;
+    }
+
+    if (path.empty()) {
+        return false;
+    }
+
+    size_t search_offset = 0;
+    do {
+        auto token_pos = path.find_first_of(folder_seps_filename, search_offset);
+        // treat the entire path as a folder if no folder separator not found
+        if (token_pos == filename_t::npos) {
+            token_pos = path.size();
+        }
+
+        auto subdir = path.substr(0, token_pos);
+#ifdef _WIN32
+        // if subdir is just a drive letter, add a slash e.g. "c:"=>"c:\",
+        // otherwise path_exists(subdir) returns false (issue #3079)
+        const bool is_drive = subdir.length() == 2 && subdir[1] == ':';
+        if (is_drive) {
+            subdir += '\\';
+            token_pos++;
+        }
+#endif
+
+        if (!subdir.empty() && !path_exists(subdir) && !mkdir_(subdir)) {
+            return false;  // return error if failed creating dir
+        }
+        search_offset = token_pos + 1;
+    } while (search_offset < path.size());
+
+    return true;
+}
+
+// Return directory name from given path or empty string
+// "abc/file" => "abc"
+// "abc/" => "abc"
+// "abc" => ""
+// "abc///" => "abc//"
+SPDLOG_INLINE filename_t dir_name(const filename_t &path) {
+    auto pos = path.find_last_of(folder_seps_filename);
+    return pos != filename_t::npos ? path.substr(0, pos) : filename_t{};
+}
+
+std::string SPDLOG_INLINE getenv(const char *field) {
+#if defined(_MSC_VER)
+    #if defined(__cplusplus_winrt)
+    return std::string{};  // not supported under uwp
+    #else
+    size_t len = 0;
+    char buf[128];
+    bool ok = ::getenv_s(&len, buf, sizeof(buf), field) == 0;
+    return ok ? buf : std::string{};
+    #endif
+#else  // revert to getenv
+    char *buf = ::getenv(field);
+    return buf ? buf : std::string{};
+#endif
+}
+
+// Do fsync by FILE handlerpointer
+// Return true on success
+SPDLOG_INLINE bool fsync(FILE *fp) {
+#ifdef _WIN32
+    return FlushFileBuffers(reinterpret_cast<HANDLE>(_get_osfhandle(_fileno(fp)))) != 0;
+#else
+    return ::fsync(fileno(fp)) == 0;
+#endif
+}
+
+// Do non-locking fwrite if possible by the os or use the regular locking fwrite
+// Return true on success.
+SPDLOG_INLINE bool fwrite_bytes(const void *ptr, const size_t n_bytes, FILE *fp) {
+#if defined(_WIN32) && defined(SPDLOG_FWRITE_UNLOCKED)
+    return _fwrite_nolock(ptr, 1, n_bytes, fp) == n_bytes;
+#elif defined(SPDLOG_FWRITE_UNLOCKED)
+    return ::fwrite_unlocked(ptr, 1, n_bytes, fp) == n_bytes;
+#else
+    return std::fwrite(ptr, 1, n_bytes, fp) == n_bytes;
+#endif
+}
+
+}  // namespace os
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/os.h

@@ -1,432 +1,127 @@
-//
-// Copyright(c) 2015 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
+
 #pragma once
 
-#include "../common.h"
-
-#include <algorithm>
-#include <chrono>
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
-#include <ctime>
-#include <functional>
-#include <string>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <thread>
-
-#ifdef _WIN32
-
-#ifndef NOMINMAX
-#define NOMINMAX // prevent windows redefining min/max
-#endif
-
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <io.h>      // _get_osfhandle and _isatty support
-#include <process.h> //  _get_pid support
-#include <windows.h>
-
-#ifdef __MINGW32__
-#include <share.h>
-#endif
-
-#else // unix
-
-#include <fcntl.h>
-#include <unistd.h>
-
-#ifdef __linux__
-#include <sys/syscall.h> //Use gettid() syscall under linux to get thread id
-
-#elif __FreeBSD__
-#include <sys/thr.h> //Use thr_self() syscall under FreeBSD to get thread id
-#endif
-
-#endif // unix
-
-#ifndef __has_feature      // Clang - feature checking macros.
-#define __has_feature(x) 0 // Compatibility with non-clang compilers.
-#endif
+#include <ctime>  // std::time_t
+#include <spdlog/common.h>
 
 namespace spdlog {
 namespace details {
 namespace os {
 
-inline spdlog::log_clock::time_point now()
-{
+SPDLOG_API spdlog::log_clock::time_point now() SPDLOG_NOEXCEPT;
 
-#if defined __linux__ && defined SPDLOG_CLOCK_COARSE
-    timespec ts;
-    ::clock_gettime(CLOCK_REALTIME_COARSE, &ts);
-    return std::chrono::time_point<log_clock, typename log_clock::duration>(
-        std::chrono::duration_cast<typename log_clock::duration>(std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec)));
+SPDLOG_API std::tm localtime(const std::time_t &time_tt) SPDLOG_NOEXCEPT;
 
-#else
-    return log_clock::now();
-#endif
-}
-inline std::tm localtime(const std::time_t &time_tt)
-{
+SPDLOG_API std::tm localtime() SPDLOG_NOEXCEPT;
 
-#ifdef _WIN32
-    std::tm tm;
-    localtime_s(&tm, &time_tt);
-#else
-    std::tm tm;
-    localtime_r(&time_tt, &tm);
-#endif
-    return tm;
-}
+SPDLOG_API std::tm gmtime(const std::time_t &time_tt) SPDLOG_NOEXCEPT;
 
-inline std::tm localtime()
-{
-    std::time_t now_t = time(nullptr);
-    return localtime(now_t);
-}
-
-inline std::tm gmtime(const std::time_t &time_tt)
-{
-
-#ifdef _WIN32
-    std::tm tm;
-    gmtime_s(&tm, &time_tt);
-#else
-    std::tm tm;
-    gmtime_r(&time_tt, &tm);
-#endif
-    return tm;
-}
-
-inline std::tm gmtime()
-{
-    std::time_t now_t = time(nullptr);
-    return gmtime(now_t);
-}
-inline bool operator==(const std::tm &tm1, const std::tm &tm2)
-{
-    return (tm1.tm_sec == tm2.tm_sec && tm1.tm_min == tm2.tm_min && tm1.tm_hour == tm2.tm_hour && tm1.tm_mday == tm2.tm_mday &&
-            tm1.tm_mon == tm2.tm_mon && tm1.tm_year == tm2.tm_year && tm1.tm_isdst == tm2.tm_isdst);
-}
-
-inline bool operator!=(const std::tm &tm1, const std::tm &tm2)
-{
-    return !(tm1 == tm2);
-}
+SPDLOG_API std::tm gmtime() SPDLOG_NOEXCEPT;
 
 // eol definition
 #if !defined(SPDLOG_EOL)
-#ifdef _WIN32
-#define SPDLOG_EOL "\r\n"
-#else
-#define SPDLOG_EOL "\n"
-#endif
+    #ifdef _WIN32
+        #define SPDLOG_EOL "\r\n"
+    #else
+        #define SPDLOG_EOL "\n"
+    #endif
 #endif
 
 SPDLOG_CONSTEXPR static const char *default_eol = SPDLOG_EOL;
 
 // folder separator
-#ifdef _WIN32
-SPDLOG_CONSTEXPR static const char folder_sep = '\\';
-#else
-SPDLOG_CONSTEXPR static const char folder_sep = '/';
+#if !defined(SPDLOG_FOLDER_SEPS)
+    #ifdef _WIN32
+        #define SPDLOG_FOLDER_SEPS "\\/"
+    #else
+        #define SPDLOG_FOLDER_SEPS "/"
+    #endif
 #endif
 
-inline void prevent_child_fd(FILE *f)
-{
-
-#ifdef _WIN32
-#if !defined(__cplusplus_winrt)
-    auto file_handle = (HANDLE)_get_osfhandle(_fileno(f));
-    if (!::SetHandleInformation(file_handle, HANDLE_FLAG_INHERIT, 0))
-        throw spdlog_ex("SetHandleInformation failed", errno);
-#endif
-#else
-    auto fd = fileno(f);
-    if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
-    {
-        throw spdlog_ex("fcntl with FD_CLOEXEC failed", errno);
-    }
-#endif
-}
+SPDLOG_CONSTEXPR static const char folder_seps[] = SPDLOG_FOLDER_SEPS;
+SPDLOG_CONSTEXPR static const filename_t::value_type folder_seps_filename[] =
+    SPDLOG_FILENAME_T(SPDLOG_FOLDER_SEPS);
 
 // fopen_s on non windows for writing
-inline bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode)
-{
-#ifdef _WIN32
-#ifdef SPDLOG_WCHAR_FILENAMES
-    *fp = _wfsopen((filename.c_str()), mode.c_str(), _SH_DENYNO);
-#else
-    *fp = _fsopen((filename.c_str()), mode.c_str(), _SH_DENYNO);
-#endif
-#else // unix
-    *fp = fopen((filename.c_str()), mode.c_str());
-#endif
+SPDLOG_API bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode);
 
-#ifdef SPDLOG_PREVENT_CHILD_FD
-    if (*fp != nullptr)
-    {
-        prevent_child_fd(*fp);
-    }
-#endif
-    return *fp == nullptr;
-}
+// Remove filename. return 0 on success
+SPDLOG_API int remove(const filename_t &filename) SPDLOG_NOEXCEPT;
 
-inline int remove(const filename_t &filename)
-{
-#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
-    return _wremove(filename.c_str());
-#else
-    return std::remove(filename.c_str());
-#endif
-}
+// Remove file if exists. return 0 on success
+// Note: Non atomic (might return failure to delete if concurrently deleted by other process/thread)
+SPDLOG_API int remove_if_exists(const filename_t &filename) SPDLOG_NOEXCEPT;
 
-inline int rename(const filename_t &filename1, const filename_t &filename2)
-{
-#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
-    return _wrename(filename1.c_str(), filename2.c_str());
-#else
-    return std::rename(filename1.c_str(), filename2.c_str());
-#endif
-}
+SPDLOG_API int rename(const filename_t &filename1, const filename_t &filename2) SPDLOG_NOEXCEPT;
 
-// Return if file exists
-inline bool file_exists(const filename_t &filename)
-{
-#ifdef _WIN32
-#ifdef SPDLOG_WCHAR_FILENAMES
-    auto attribs = GetFileAttributesW(filename.c_str());
-#else
-    auto attribs = GetFileAttributesA(filename.c_str());
-#endif
-    return (attribs != INVALID_FILE_ATTRIBUTES && !(attribs & FILE_ATTRIBUTE_DIRECTORY));
-#else // common linux/unix all have the stat system call
-    struct stat buffer;
-    return (stat(filename.c_str(), &buffer) == 0);
-#endif
-}
+// Return if file exists.
+SPDLOG_API bool path_exists(const filename_t &filename) SPDLOG_NOEXCEPT;
 
 // Return file size according to open FILE* object
-inline size_t filesize(FILE *f)
-{
-    if (f == nullptr)
-    {
-        throw spdlog_ex("Failed getting file size. fd is null");
-    }
-#if defined(_WIN32) && !defined(__CYGWIN__)
-    int fd = _fileno(f);
-#if _WIN64 // 64 bits
-    struct _stat64 st;
-    if (_fstat64(fd, &st) == 0)
-    {
-        return st.st_size;
-    }
-
-#else // windows 32 bits
-    long ret = _filelength(fd);
-    if (ret >= 0)
-    {
-        return static_cast<size_t>(ret);
-    }
-#endif
-
-#else // unix
-    int fd = fileno(f);
-// 64 bits(but not in osx or cygwin, where fstat64 is deprecated)
-#if !defined(__FreeBSD__) && !defined(__APPLE__) && (defined(__x86_64__) || defined(__ppc64__)) && !defined(__CYGWIN__)
-    struct stat64 st;
-    if (fstat64(fd, &st) == 0)
-    {
-        return static_cast<size_t>(st.st_size);
-    }
-#else // unix 32 bits or cygwin
-    struct stat st;
-
-    if (fstat(fd, &st) == 0)
-    {
-        return static_cast<size_t>(st.st_size);
-    }
-#endif
-#endif
-    throw spdlog_ex("Failed getting file size from fd", errno);
-}
+SPDLOG_API size_t filesize(FILE *f);
 
 // Return utc offset in minutes or throw spdlog_ex on failure
-inline int utc_minutes_offset(const std::tm &tm = details::os::localtime())
-{
-
-#ifdef _WIN32
-#if _WIN32_WINNT < _WIN32_WINNT_WS08
-    TIME_ZONE_INFORMATION tzinfo;
-    auto rv = GetTimeZoneInformation(&tzinfo);
-#else
-    DYNAMIC_TIME_ZONE_INFORMATION tzinfo;
-    auto rv = GetDynamicTimeZoneInformation(&tzinfo);
-#endif
-    if (rv == TIME_ZONE_ID_INVALID)
-        throw spdlog::spdlog_ex("Failed getting timezone info. ", errno);
-
-    int offset = -tzinfo.Bias;
-    if (tm.tm_isdst)
-    {
-        offset -= tzinfo.DaylightBias;
-    }
-    else
-    {
-        offset -= tzinfo.StandardBias;
-    }
-    return offset;
-#else
-
-#if defined(sun) || defined(__sun) || defined(_AIX)
-    // 'tm_gmtoff' field is BSD extension and it's missing on SunOS/Solaris
-    struct helper
-    {
-        static long int calculate_gmt_offset(const std::tm &localtm = details::os::localtime(), const std::tm &gmtm = details::os::gmtime())
-        {
-            int local_year = localtm.tm_year + (1900 - 1);
-            int gmt_year = gmtm.tm_year + (1900 - 1);
-
-            long int days = (
-                // difference in day of year
-                localtm.tm_yday -
-                gmtm.tm_yday
-
-                // + intervening leap days
-                + ((local_year >> 2) - (gmt_year >> 2)) - (local_year / 100 - gmt_year / 100) +
-                ((local_year / 100 >> 2) - (gmt_year / 100 >> 2))
-
-                // + difference in years * 365 */
-                + (long int)(local_year - gmt_year) * 365);
-
-            long int hours = (24 * days) + (localtm.tm_hour - gmtm.tm_hour);
-            long int mins = (60 * hours) + (localtm.tm_min - gmtm.tm_min);
-            long int secs = (60 * mins) + (localtm.tm_sec - gmtm.tm_sec);
-
-            return secs;
-        }
-    };
-
-    auto offset_seconds = helper::calculate_gmt_offset(tm);
-#else
-    auto offset_seconds = tm.tm_gmtoff;
-#endif
-
-    return static_cast<int>(offset_seconds / 60);
-#endif
-}
+SPDLOG_API int utc_minutes_offset(const std::tm &tm = details::os::localtime());
 
 // Return current thread id as size_t
 // It exists because the std::this_thread::get_id() is much slower(especially
 // under VS 2013)
-inline size_t _thread_id()
-{
-#ifdef _WIN32
-    return static_cast<size_t>(::GetCurrentThreadId());
-#elif __linux__
-#if defined(__ANDROID__) && defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
-#define SYS_gettid __NR_gettid
-#endif
-    return static_cast<size_t>(syscall(SYS_gettid));
-#elif __FreeBSD__
-    long tid;
-    thr_self(&tid);
-    return static_cast<size_t>(tid);
-#elif __APPLE__
-    uint64_t tid;
-    pthread_threadid_np(nullptr, &tid);
-    return static_cast<size_t>(tid);
-#else // Default to standard C++11 (other Unix)
-    return static_cast<size_t>(std::hash<std::thread::id>()(std::this_thread::get_id()));
-#endif
-}
+SPDLOG_API size_t _thread_id() SPDLOG_NOEXCEPT;
 
 // Return current thread id as size_t (from thread local storage)
-inline size_t thread_id()
-{
-#if defined(SPDLOG_DISABLE_TID_CACHING) || (defined(_MSC_VER) && (_MSC_VER < 1900)) || defined(__cplusplus_winrt) ||                       \
-    (defined(__clang__) && !__has_feature(cxx_thread_local))
-    return _thread_id();
-#else // cache thread id in tls
-    static thread_local const size_t tid = _thread_id();
-    return tid;
-#endif
-}
+SPDLOG_API size_t thread_id() SPDLOG_NOEXCEPT;
 
 // This is avoid msvc issue in sleep_for that happens if the clock changes.
 // See https://github.com/gabime/spdlog/issues/609
-inline void sleep_for_millis(int milliseconds)
-{
-#if defined(_WIN32)
-    ::Sleep(milliseconds);
-#else
-    std::this_thread::sleep_for(std::chrono::milliseconds(milliseconds));
-#endif
-}
+SPDLOG_API void sleep_for_millis(unsigned int milliseconds) SPDLOG_NOEXCEPT;
 
-// wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)
-#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
-#define SPDLOG_FILENAME_T(s) L##s
-inline std::string filename_to_str(const filename_t &filename)
-{
-    std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> c;
-    return c.to_bytes(filename);
-}
-#else
-#define SPDLOG_FILENAME_T(s) s
-inline std::string filename_to_str(const filename_t &filename)
-{
-    return filename;
-}
-#endif
+SPDLOG_API std::string filename_to_str(const filename_t &filename);
 
-inline int pid()
-{
-
-#ifdef _WIN32
-    return static_cast<int>(::GetCurrentProcessId());
-#else
-    return static_cast<int>(::getpid());
-#endif
-}
+SPDLOG_API int pid() SPDLOG_NOEXCEPT;
 
 // Determine if the terminal supports colors
 // Source: https://github.com/agauniyal/rang/
-inline bool is_color_terminal()
-{
-#ifdef _WIN32
-    return true;
-#else
-    static constexpr const char *Terms[] = {
-        "ansi", "color", "console", "cygwin", "gnome", "konsole", "kterm", "linux", "msys", "putty", "rxvt", "screen", "vt100", "xterm"};
+SPDLOG_API bool is_color_terminal() SPDLOG_NOEXCEPT;
 
-    const char *env_p = std::getenv("TERM");
-    if (env_p == nullptr)
-    {
-        return false;
-    }
-
-    static const bool result =
-        std::any_of(std::begin(Terms), std::end(Terms), [&](const char *term) { return std::strstr(env_p, term) != nullptr; });
-    return result;
-#endif
-}
-
-// Detrmine if the terminal attached
+// Determine if the terminal attached
 // Source: https://github.com/agauniyal/rang/
-inline bool in_terminal(FILE *file)
-{
+SPDLOG_API bool in_terminal(FILE *file) SPDLOG_NOEXCEPT;
 
-#ifdef _WIN32
-    return _isatty(_fileno(file)) != 0;
-#else
-    return isatty(fileno(file)) != 0;
+#if (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) && defined(_WIN32)
+SPDLOG_API void wstr_to_utf8buf(wstring_view_t wstr, memory_buf_t &target);
+
+SPDLOG_API void utf8_to_wstrbuf(string_view_t str, wmemory_buf_t &target);
+#endif
+
+// Return directory name from given path or empty string
+// "abc/file" => "abc"
+// "abc/" => "abc"
+// "abc" => ""
+// "abc///" => "abc//"
+SPDLOG_API filename_t dir_name(const filename_t &path);
+
+// Create a dir from the given path.
+// Return true if succeeded or if this dir already exists.
+SPDLOG_API bool create_dir(const filename_t &path);
+
+// non thread safe, cross platform getenv/getenv_s
+// return empty string if field not found
+SPDLOG_API std::string getenv(const char *field);
+
+// Do fsync by FILE objectpointer.
+// Return true on success.
+SPDLOG_API bool fsync(FILE *fp);
+
+// Do non-locking fwrite if possible by the os or use the regular locking fwrite
+// Return true on success.
+SPDLOG_API bool fwrite_bytes(const void *ptr, const size_t n_bytes, FILE *fp);
+
+}  // namespace os
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "os-inl.h"
 #endif
-}
-} // namespace os
-} // namespace details
-} // namespace spdlog

include/spdlog/details/pattern_formatter.h

@@ -1,774 +0,0 @@
-//
-// Copyright(c) 2015 Gabi Melman.
-// Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
-
-#pragma once
-
-#include "spdlog/details/fmt_helper.h"
-#include "spdlog/details/log_msg.h"
-#include "spdlog/details/os.h"
-#include "spdlog/fmt/fmt.h"
-#include "spdlog/formatter.h"
-
-#include <array>
-#include <chrono>
-#include <ctime>
-#include <memory>
-#include <mutex>
-#include <string>
-#include <thread>
-#include <utility>
-#include <vector>
-
-namespace spdlog {
-namespace details {
-
-class flag_formatter
-{
-public:
-    virtual ~flag_formatter() = default;
-    virtual void format(const details::log_msg &msg, const std::tm &tm_time, fmt::memory_buffer &dest) = 0;
-};
-
-///////////////////////////////////////////////////////////////////////
-// name & level pattern appenders
-///////////////////////////////////////////////////////////////////////
-class name_formatter : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_str(*msg.logger_name, dest);
-    }
-};
-
-// log level appender
-class level_formatter : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_c_str(level::to_c_str(msg.level), dest);
-    }
-};
-
-// short log level appender
-class short_level_formatter : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_c_str(level::to_short_c_str(msg.level), dest);
-    }
-};
-
-///////////////////////////////////////////////////////////////////////
-// Date time pattern appenders
-///////////////////////////////////////////////////////////////////////
-
-static const char *ampm(const tm &t)
-{
-    return t.tm_hour >= 12 ? "PM" : "AM";
-}
-
-static int to12h(const tm &t)
-{
-    return t.tm_hour > 12 ? t.tm_hour - 12 : t.tm_hour;
-}
-
-// Abbreviated weekday name
-static const char *days[]{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
-class a_formatter : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_c_str(days[tm_time.tm_wday], dest);
-    }
-};
-
-// Full weekday name
-static const char *full_days[]{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
-class A_formatter : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_c_str(full_days[tm_time.tm_wday], dest);
-    }
-};
-
-// Abbreviated month
-static const char *months[]{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec"};
-class b_formatter : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_c_str(months[tm_time.tm_mon], dest);
-    }
-};
-
-// Full month name
-static const char *full_months[]{
-    "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
-class B_formatter : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_c_str(full_months[tm_time.tm_mon], dest);
-    }
-};
-
-// Date and time representation (Thu Aug 23 15:35:46 2014)
-class c_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        // fmt::format_to(dest, "{} {} {} ", days[tm_time.tm_wday],
-        // months[tm_time.tm_mon], tm_time.tm_mday);
-        // date
-        fmt_helper::append_str(days[tm_time.tm_wday], dest);
-        dest.push_back(' ');
-        fmt_helper::append_str(months[tm_time.tm_mon], dest);
-        dest.push_back(' ');
-        fmt_helper::append_int(tm_time.tm_mday, dest);
-        dest.push_back(' ');
-        // time
-
-        fmt_helper::pad2(tm_time.tm_hour, dest);
-        dest.push_back(':');
-        fmt_helper::pad2(tm_time.tm_min, dest);
-        dest.push_back(':');
-        fmt_helper::pad2(tm_time.tm_sec, dest);
-        dest.push_back(' ');
-        fmt_helper::append_int(tm_time.tm_year + 1900, dest);
-    }
-};
-
-// year - 2 digit
-class C_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(tm_time.tm_year % 100, dest);
-    }
-};
-
-// Short MM/DD/YY date, equivalent to %m/%d/%y 08/23/01
-class D_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(tm_time.tm_mon + 1, dest);
-        dest.push_back('/');
-        fmt_helper::pad2(tm_time.tm_mday, dest);
-        dest.push_back('/');
-        fmt_helper::pad2(tm_time.tm_year % 100, dest);
-    }
-};
-
-// year - 4 digit
-class Y_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_int(tm_time.tm_year + 1900, dest);
-    }
-};
-
-// month 1-12
-class m_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(tm_time.tm_mon + 1, dest);
-    }
-};
-
-// day of month 1-31
-class d_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(tm_time.tm_mday, dest);
-    }
-};
-
-// hours in 24 format 0-23
-class H_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(tm_time.tm_hour, dest);
-    }
-};
-
-// hours in 12 format 1-12
-class I_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(to12h(tm_time), dest);
-    }
-};
-
-// minutes 0-59
-class M_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(tm_time.tm_min, dest);
-    }
-};
-
-// seconds 0-59
-class S_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(tm_time.tm_sec, dest);
-    }
-};
-
-// milliseconds
-class e_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        auto millis = fmt_helper::time_fraction<std::chrono::milliseconds>(msg.time);
-        fmt_helper::pad3(static_cast<int>(millis.count()), dest);
-    }
-};
-
-// microseconds
-class f_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        auto micros = fmt_helper::time_fraction<std::chrono::microseconds>(msg.time);
-        fmt_helper::pad6(static_cast<size_t>(micros.count()), dest);
-    }
-};
-
-// nanoseconds
-class F_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        auto ns = fmt_helper::time_fraction<std::chrono::nanoseconds>(msg.time);
-        fmt::format_to(dest, "{:09}", ns.count());
-    }
-};
-
-// seconds since epoch
-class E_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        auto duration = msg.time.time_since_epoch();
-        auto seconds = std::chrono::duration_cast<std::chrono::seconds>(duration).count();
-        fmt_helper::append_int(seconds, dest);
-    }
-};
-
-// AM/PM
-class p_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_c_str(ampm(tm_time), dest);
-    }
-};
-
-// 12 hour clock 02:55:02 pm
-class r_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(to12h(tm_time), dest);
-        dest.push_back(':');
-        fmt_helper::pad2(tm_time.tm_min, dest);
-        dest.push_back(':');
-        fmt_helper::pad2(tm_time.tm_sec, dest);
-        dest.push_back(' ');
-        fmt_helper::append_c_str(ampm(tm_time), dest);
-    }
-};
-
-// 24-hour HH:MM time, equivalent to %H:%M
-class R_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad2(tm_time.tm_hour, dest);
-        dest.push_back(':');
-        fmt_helper::pad2(tm_time.tm_min, dest);
-    }
-};
-
-// ISO 8601 time format (HH:MM:SS), equivalent to %H:%M:%S
-class T_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        // fmt::format_to(dest, "{:02}:{:02}:{:02}", tm_time.tm_hour,
-        // tm_time.tm_min, tm_time.tm_sec);
-        fmt_helper::pad2(tm_time.tm_hour, dest);
-        dest.push_back(':');
-        fmt_helper::pad2(tm_time.tm_min, dest);
-        dest.push_back(':');
-        fmt_helper::pad2(tm_time.tm_sec, dest);
-    }
-};
-
-// ISO 8601 offset from UTC in timezone (+-HH:MM)
-class z_formatter final : public flag_formatter
-{
-public:
-    const std::chrono::seconds cache_refresh = std::chrono::seconds(5);
-
-    z_formatter() = default;
-    z_formatter(const z_formatter &) = delete;
-    z_formatter &operator=(const z_formatter &) = delete;
-
-    void format(const details::log_msg &msg, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-#ifdef _WIN32
-        int total_minutes = get_cached_offset(msg, tm_time);
-#else
-        // No need to chache under gcc,
-        // it is very fast (already stored in tm.tm_gmtoff)
-        (void)(msg);
-        int total_minutes = os::utc_minutes_offset(tm_time);
-#endif
-        bool is_negative = total_minutes < 0;
-        if (is_negative)
-        {
-            total_minutes = -total_minutes;
-            dest.push_back('-');
-        }
-        else
-        {
-            dest.push_back('+');
-        }
-
-        fmt_helper::pad2(total_minutes / 60, dest); // hours
-        dest.push_back(':');
-        fmt_helper::pad2(total_minutes % 60, dest); // minutes
-    }
-
-private:
-    log_clock::time_point last_update_{std::chrono::seconds(0)};
-#ifdef _WIN32
-    int offset_minutes_{0};
-
-    int get_cached_offset(const log_msg &msg, const std::tm &tm_time)
-    {
-        if (msg.time - last_update_ >= cache_refresh)
-        {
-            offset_minutes_ = os::utc_minutes_offset(tm_time);
-            last_update_ = msg.time;
-        }
-        return offset_minutes_;
-    }
-#endif
-};
-
-// Thread id
-class t_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad6(msg.thread_id, dest);
-    }
-};
-
-// Current pid
-class pid_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_int(details::os::pid(), dest);
-    }
-};
-
-// message counter formatter
-class i_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::pad6(msg.msg_id, dest);
-    }
-};
-
-class v_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_buf(msg.raw, dest);
-    }
-};
-
-class ch_formatter final : public flag_formatter
-{
-public:
-    explicit ch_formatter(char ch)
-        : ch_(ch)
-    {
-    }
-    void format(const details::log_msg &, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        dest.push_back(ch_);
-    }
-
-private:
-    char ch_;
-};
-
-// aggregate user chars to display as is
-class aggregate_formatter final : public flag_formatter
-{
-public:
-    aggregate_formatter() = default;
-
-    void add_ch(char ch)
-    {
-        str_ += ch;
-    }
-    void format(const details::log_msg &, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        fmt_helper::append_str(str_, dest);
-    }
-
-private:
-    std::string str_;
-};
-
-// mark the color range. expect it to be in the form of "%^colored text%$"
-class color_start_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        msg.color_range_start = dest.size();
-    }
-};
-class color_stop_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &, fmt::memory_buffer &dest) override
-    {
-        msg.color_range_end = dest.size();
-    }
-};
-
-// Full info formatter
-// pattern: [%Y-%m-%d %H:%M:%S.%e] [%n] [%l] %v
-class full_formatter final : public flag_formatter
-{
-    void format(const details::log_msg &msg, const std::tm &tm_time, fmt::memory_buffer &dest) override
-    {
-        using std::chrono::duration_cast;
-        using std::chrono::milliseconds;
-        using std::chrono::seconds;
-
-#ifndef SPDLOG_NO_DATETIME
-
-        // cache the date/time part for the next second.
-        auto duration = msg.time.time_since_epoch();
-        auto secs = duration_cast<seconds>(duration);
-
-        if (cache_timestamp_ != secs || cached_datetime_.size() == 0)
-        {
-            cached_datetime_.clear();
-            cached_datetime_.push_back('[');
-            fmt_helper::append_int(tm_time.tm_year + 1900, cached_datetime_);
-            cached_datetime_.push_back('-');
-
-            fmt_helper::pad2(tm_time.tm_mon + 1, cached_datetime_);
-            cached_datetime_.push_back('-');
-
-            fmt_helper::pad2(tm_time.tm_mday, cached_datetime_);
-            cached_datetime_.push_back(' ');
-
-            fmt_helper::pad2(tm_time.tm_hour, cached_datetime_);
-            cached_datetime_.push_back(':');
-
-            fmt_helper::pad2(tm_time.tm_min, cached_datetime_);
-            cached_datetime_.push_back(':');
-
-            fmt_helper::pad2(tm_time.tm_sec, cached_datetime_);
-            cached_datetime_.push_back('.');
-
-            cache_timestamp_ = secs;
-        }
-        fmt_helper::append_buf(cached_datetime_, dest);
-
-        auto millis = fmt_helper::time_fraction<milliseconds>(msg.time);
-        fmt_helper::pad3(static_cast<int>(millis.count()), dest);
-        dest.push_back(']');
-        dest.push_back(' ');
-
-#else // no datetime needed
-        (void)tm_time;
-#endif
-
-#ifndef SPDLOG_NO_NAME
-        dest.push_back('[');
-        fmt_helper::append_str(*msg.logger_name, dest);
-        dest.push_back(']');
-        dest.push_back(' ');
-#endif
-
-        dest.push_back('[');
-        // wrap the level name with color
-        msg.color_range_start = dest.size();
-        fmt_helper::append_c_str(level::to_c_str(msg.level), dest);
-        msg.color_range_end = dest.size();
-        dest.push_back(']');
-        dest.push_back(' ');
-        fmt_helper::append_buf(msg.raw, dest);
-    }
-
-private:
-    std::chrono::seconds cache_timestamp_{0};
-    fmt::basic_memory_buffer<char, 128> cached_datetime_;
-};
-
-} // namespace details
-
-class pattern_formatter final : public formatter
-{
-public:
-    explicit pattern_formatter(
-        std::string pattern, pattern_time_type time_type = pattern_time_type::local, std::string eol = spdlog::details::os::default_eol)
-        : pattern_(std::move(pattern))
-        , eol_(std::move(eol))
-        , pattern_time_type_(time_type)
-        , last_log_secs_(0)
-    {
-        std::memset(&cached_tm_, 0, sizeof(cached_tm_));
-        compile_pattern_(pattern_);
-    }
-
-    pattern_formatter(const pattern_formatter &other) = delete;
-    pattern_formatter &operator=(const pattern_formatter &other) = delete;
-
-    std::unique_ptr<formatter> clone() const override
-    {
-        return details::make_unique<pattern_formatter>(pattern_, pattern_time_type_, eol_);
-    }
-
-    void format(const details::log_msg &msg, fmt::memory_buffer &dest) override
-    {
-#ifndef SPDLOG_NO_DATETIME
-        auto secs = std::chrono::duration_cast<std::chrono::seconds>(msg.time.time_since_epoch());
-        if (secs != last_log_secs_)
-        {
-            cached_tm_ = get_time_(msg);
-            last_log_secs_ = secs;
-        }
-#endif
-        for (auto &f : formatters_)
-        {
-            f->format(msg, cached_tm_, dest);
-        }
-        // write eol
-        details::fmt_helper::append_str(eol_, dest);
-    }
-
-private:
-    std::string pattern_;
-    std::string eol_;
-    pattern_time_type pattern_time_type_;
-    std::tm cached_tm_;
-    std::chrono::seconds last_log_secs_;
-
-    std::vector<std::unique_ptr<details::flag_formatter>> formatters_;
-
-    std::tm get_time_(const details::log_msg &msg)
-    {
-        if (pattern_time_type_ == pattern_time_type::local)
-        {
-            return details::os::localtime(log_clock::to_time_t(msg.time));
-        }
-        return details::os::gmtime(log_clock::to_time_t(msg.time));
-    }
-
-    void handle_flag_(char flag)
-    {
-        switch (flag)
-        {
-        // logger name
-        case 'n':
-            formatters_.push_back(details::make_unique<details::name_formatter>());
-            break;
-
-        case 'l':
-            formatters_.push_back(details::make_unique<details::level_formatter>());
-            break;
-
-        case 'L':
-            formatters_.push_back(details::make_unique<details::short_level_formatter>());
-            break;
-
-        case ('t'):
-            formatters_.push_back(details::make_unique<details::t_formatter>());
-            break;
-
-        case ('v'):
-            formatters_.push_back(details::make_unique<details::v_formatter>());
-            break;
-
-        case ('a'):
-            formatters_.push_back(details::make_unique<details::a_formatter>());
-            break;
-
-        case ('A'):
-            formatters_.push_back(details::make_unique<details::A_formatter>());
-            break;
-
-        case ('b'):
-        case ('h'):
-            formatters_.push_back(details::make_unique<details::b_formatter>());
-            break;
-
-        case ('B'):
-            formatters_.push_back(details::make_unique<details::B_formatter>());
-            break;
-        case ('c'):
-            formatters_.push_back(details::make_unique<details::c_formatter>());
-            break;
-
-        case ('C'):
-            formatters_.push_back(details::make_unique<details::C_formatter>());
-            break;
-
-        case ('Y'):
-            formatters_.push_back(details::make_unique<details::Y_formatter>());
-            break;
-
-        case ('D'):
-        case ('x'):
-            formatters_.push_back(details::make_unique<details::D_formatter>());
-            break;
-
-        case ('m'):
-            formatters_.push_back(details::make_unique<details::m_formatter>());
-            break;
-
-        case ('d'):
-            formatters_.push_back(details::make_unique<details::d_formatter>());
-            break;
-
-        case ('H'):
-            formatters_.push_back(details::make_unique<details::H_formatter>());
-            break;
-
-        case ('I'):
-            formatters_.push_back(details::make_unique<details::I_formatter>());
-            break;
-
-        case ('M'):
-            formatters_.push_back(details::make_unique<details::M_formatter>());
-            break;
-
-        case ('S'):
-            formatters_.push_back(details::make_unique<details::S_formatter>());
-            break;
-
-        case ('e'):
-            formatters_.push_back(details::make_unique<details::e_formatter>());
-            break;
-
-        case ('f'):
-            formatters_.push_back(details::make_unique<details::f_formatter>());
-            break;
-        case ('F'):
-            formatters_.push_back(details::make_unique<details::F_formatter>());
-            break;
-
-        case ('E'):
-            formatters_.push_back(details::make_unique<details::E_formatter>());
-            break;
-
-        case ('p'):
-            formatters_.push_back(details::make_unique<details::p_formatter>());
-            break;
-
-        case ('r'):
-            formatters_.push_back(details::make_unique<details::r_formatter>());
-            break;
-
-        case ('R'):
-            formatters_.push_back(details::make_unique<details::R_formatter>());
-            break;
-
-        case ('T'):
-        case ('X'):
-            formatters_.push_back(details::make_unique<details::T_formatter>());
-            break;
-
-        case ('z'):
-            formatters_.push_back(details::make_unique<details::z_formatter>());
-            break;
-
-        case ('+'):
-            formatters_.push_back(details::make_unique<details::full_formatter>());
-            break;
-
-        case ('P'):
-            formatters_.push_back(details::make_unique<details::pid_formatter>());
-            break;
-#ifdef SPDLOG_ENABLE_MESSAGE_COUNTER
-        case ('i'):
-            formatters_.push_back(details::make_unique<details::i_formatter>());
-            break;
-#endif
-        case ('^'):
-            formatters_.push_back(details::make_unique<details::color_start_formatter>());
-            break;
-
-        case ('$'):
-            formatters_.push_back(details::make_unique<details::color_stop_formatter>());
-            break;
-
-        default: // Unknown flag appears as is
-            formatters_.push_back(details::make_unique<details::ch_formatter>('%'));
-            formatters_.push_back(details::make_unique<details::ch_formatter>(flag));
-            break;
-        }
-    }
-
-    void compile_pattern_(const std::string &pattern)
-    {
-        auto end = pattern.end();
-        std::unique_ptr<details::aggregate_formatter> user_chars;
-        formatters_.clear();
-        for (auto it = pattern.begin(); it != end; ++it)
-        {
-            if (*it == '%')
-            {
-                if (user_chars) // append user chars found so far
-                {
-                    formatters_.push_back(std::move(user_chars));
-                }
-                if (++it != end)
-                {
-                    handle_flag_(*it);
-                }
-                else
-                {
-                    break;
-                }
-            }
-            else // chars not following the % sign should be displayed as is
-            {
-                if (!user_chars)
-                {
-                    user_chars = details::make_unique<details::aggregate_formatter>();
-                }
-                user_chars->add_ch(*it);
-            }
-        }
-        if (user_chars) // append raw chars found so far
-        {
-            formatters_.push_back(std::move(user_chars));
-        }
-    }
-};
-} // namespace spdlog

include/spdlog/details/periodic_worker-inl.h

@@ -0,0 +1,26 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/periodic_worker.h>
+#endif
+
+namespace spdlog {
+namespace details {
+
+// stop the worker thread and join it
+SPDLOG_INLINE periodic_worker::~periodic_worker() {
+    if (worker_thread_.joinable()) {
+        {
+            std::lock_guard<std::mutex> lock(mutex_);
+            active_ = false;
+        }
+        cv_.notify_one();
+        worker_thread_.join();
+    }
+}
+
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/periodic_worker.h

@@ -1,8 +1,5 @@
-
-//
-// Copyright(c) 2018 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
@@ -10,7 +7,8 @@
 //
 // RAII over the owned thread:
 //    creates the thread on construction.
-//    stops and joins the thread on destruction.
+//    stops and joins the thread on destruction (if the thread is executing a callback, wait for it
+//    to finish first).
 
 #include <chrono>
 #include <condition_variable>
@@ -20,46 +18,31 @@
 namespace spdlog {
 namespace details {
 
-class periodic_worker
-{
+class SPDLOG_API periodic_worker {
 public:
-    periodic_worker(const std::function<void()> &callback_fun, std::chrono::seconds interval)
-    {
-        active_ = (interval > std::chrono::seconds::zero());
-        if (!active_)
-        {
+    template <typename Rep, typename Period>
+    periodic_worker(const std::function<void()> &callback_fun,
+                    std::chrono::duration<Rep, Period> interval) {
+        active_ = (interval > std::chrono::duration<Rep, Period>::zero());
+        if (!active_) {
             return;
         }
 
         worker_thread_ = std::thread([this, callback_fun, interval]() {
-            for (;;)
-            {
+            for (;;) {
                 std::unique_lock<std::mutex> lock(this->mutex_);
-                if (this->cv_.wait_for(lock, interval, [this] { return !this->active_; }))
-                {
-                    return; // active_ == false, so exit this thread
+                if (this->cv_.wait_for(lock, interval, [this] { return !this->active_; })) {
+                    return;  // active_ == false, so exit this thread
                 }
                 callback_fun();
             }
         });
     }
-
+    std::thread &get_thread() { return worker_thread_; }
     periodic_worker(const periodic_worker &) = delete;
     periodic_worker &operator=(const periodic_worker &) = delete;
-
     // stop the worker thread and join it
-    ~periodic_worker()
-    {
-        if (worker_thread_.joinable())
-        {
-            {
-                std::lock_guard<std::mutex> lock(mutex_);
-                active_ = false;
-            }
-            cv_.notify_one();
-            worker_thread_.join();
-        }
-    }
+    ~periodic_worker();
 
 private:
     bool active_;
@@ -67,5 +50,9 @@ private:
     std::mutex mutex_;
     std::condition_variable cv_;
 };
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "periodic_worker-inl.h"
+#endif

include/spdlog/details/registry-inl.h

@@ -0,0 +1,261 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/registry.h>
+#endif
+
+#include <spdlog/common.h>
+#include <spdlog/details/periodic_worker.h>
+#include <spdlog/logger.h>
+#include <spdlog/pattern_formatter.h>
+
+#ifndef SPDLOG_DISABLE_DEFAULT_LOGGER
+    // support for the default stdout color logger
+    #ifdef _WIN32
+        #include <spdlog/sinks/wincolor_sink.h>
+    #else
+        #include <spdlog/sinks/ansicolor_sink.h>
+    #endif
+#endif  // SPDLOG_DISABLE_DEFAULT_LOGGER
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE registry::registry()
+    : formatter_(new pattern_formatter()) {
+#ifndef SPDLOG_DISABLE_DEFAULT_LOGGER
+    // create default logger (ansicolor_stdout_sink_mt or wincolor_stdout_sink_mt in windows).
+    #ifdef _WIN32
+    auto color_sink = std::make_shared<sinks::wincolor_stdout_sink_mt>();
+    #else
+    auto color_sink = std::make_shared<sinks::ansicolor_stdout_sink_mt>();
+    #endif
+
+    const char *default_logger_name = "";
+    default_logger_ = std::make_shared<spdlog::logger>(default_logger_name, std::move(color_sink));
+    loggers_[default_logger_name] = default_logger_;
+
+#endif  // SPDLOG_DISABLE_DEFAULT_LOGGER
+}
+
+SPDLOG_INLINE registry::~registry() = default;
+
+SPDLOG_INLINE void registry::register_logger(std::shared_ptr<logger> new_logger) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    register_logger_(std::move(new_logger));
+}
+
+SPDLOG_INLINE void registry::initialize_logger(std::shared_ptr<logger> new_logger) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    new_logger->set_formatter(formatter_->clone());
+
+    if (err_handler_) {
+        new_logger->set_error_handler(err_handler_);
+    }
+
+    // set new level according to previously configured level or default level
+    auto it = log_levels_.find(new_logger->name());
+    auto new_level = it != log_levels_.end() ? it->second : global_log_level_;
+    new_logger->set_level(new_level);
+
+    new_logger->flush_on(flush_level_);
+
+    if (backtrace_n_messages_ > 0) {
+        new_logger->enable_backtrace(backtrace_n_messages_);
+    }
+
+    if (automatic_registration_) {
+        register_logger_(std::move(new_logger));
+    }
+}
+
+SPDLOG_INLINE std::shared_ptr<logger> registry::get(const std::string &logger_name) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    auto found = loggers_.find(logger_name);
+    return found == loggers_.end() ? nullptr : found->second;
+}
+
+SPDLOG_INLINE std::shared_ptr<logger> registry::default_logger() {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    return default_logger_;
+}
+
+// Return raw ptr to the default logger.
+// To be used directly by the spdlog default api (e.g. spdlog::info)
+// This make the default API faster, but cannot be used concurrently with set_default_logger().
+// e.g do not call set_default_logger() from one thread while calling spdlog::info() from another.
+SPDLOG_INLINE logger *registry::get_default_raw() { return default_logger_.get(); }
+
+// set default logger.
+// default logger is stored in default_logger_ (for faster retrieval) and in the loggers_ map.
+SPDLOG_INLINE void registry::set_default_logger(std::shared_ptr<logger> new_default_logger) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    if (new_default_logger != nullptr) {
+        loggers_[new_default_logger->name()] = new_default_logger;
+    }
+    default_logger_ = std::move(new_default_logger);
+}
+
+SPDLOG_INLINE void registry::set_tp(std::shared_ptr<thread_pool> tp) {
+    std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
+    tp_ = std::move(tp);
+}
+
+SPDLOG_INLINE std::shared_ptr<thread_pool> registry::get_tp() {
+    std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
+    return tp_;
+}
+
+// Set global formatter. Each sink in each logger will get a clone of this object
+SPDLOG_INLINE void registry::set_formatter(std::unique_ptr<formatter> formatter) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    formatter_ = std::move(formatter);
+    for (auto &l : loggers_) {
+        l.second->set_formatter(formatter_->clone());
+    }
+}
+
+SPDLOG_INLINE void registry::enable_backtrace(size_t n_messages) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    backtrace_n_messages_ = n_messages;
+
+    for (auto &l : loggers_) {
+        l.second->enable_backtrace(n_messages);
+    }
+}
+
+SPDLOG_INLINE void registry::disable_backtrace() {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    backtrace_n_messages_ = 0;
+    for (auto &l : loggers_) {
+        l.second->disable_backtrace();
+    }
+}
+
+SPDLOG_INLINE void registry::set_level(level::level_enum log_level) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        l.second->set_level(log_level);
+    }
+    global_log_level_ = log_level;
+}
+
+SPDLOG_INLINE void registry::flush_on(level::level_enum log_level) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        l.second->flush_on(log_level);
+    }
+    flush_level_ = log_level;
+}
+
+SPDLOG_INLINE void registry::set_error_handler(err_handler handler) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        l.second->set_error_handler(handler);
+    }
+    err_handler_ = std::move(handler);
+}
+
+SPDLOG_INLINE void registry::apply_all(
+    const std::function<void(const std::shared_ptr<logger>)> &fun) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        fun(l.second);
+    }
+}
+
+SPDLOG_INLINE void registry::flush_all() {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        l.second->flush();
+    }
+}
+
+SPDLOG_INLINE void registry::drop(const std::string &logger_name) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    auto is_default_logger = default_logger_ && default_logger_->name() == logger_name;
+    loggers_.erase(logger_name);
+    if (is_default_logger) {
+        default_logger_.reset();
+    }
+}
+
+SPDLOG_INLINE void registry::drop_all() {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    loggers_.clear();
+    default_logger_.reset();
+}
+
+// clean all resources and threads started by the registry
+SPDLOG_INLINE void registry::shutdown() {
+    {
+        std::lock_guard<std::mutex> lock(flusher_mutex_);
+        periodic_flusher_.reset();
+    }
+
+    drop_all();
+
+    {
+        std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
+        tp_.reset();
+    }
+}
+
+SPDLOG_INLINE std::recursive_mutex &registry::tp_mutex() { return tp_mutex_; }
+
+SPDLOG_INLINE void registry::set_automatic_registration(bool automatic_registration) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    automatic_registration_ = automatic_registration;
+}
+
+SPDLOG_INLINE void registry::set_levels(log_levels levels, level::level_enum *global_level) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    log_levels_ = std::move(levels);
+    auto global_level_requested = global_level != nullptr;
+    global_log_level_ = global_level_requested ? *global_level : global_log_level_;
+
+    for (auto &logger : loggers_) {
+        auto logger_entry = log_levels_.find(logger.first);
+        if (logger_entry != log_levels_.end()) {
+            logger.second->set_level(logger_entry->second);
+        } else if (global_level_requested) {
+            logger.second->set_level(*global_level);
+        }
+    }
+}
+
+SPDLOG_INLINE registry &registry::instance() {
+    static registry s_instance;
+    return s_instance;
+}
+
+SPDLOG_INLINE void registry::apply_logger_env_levels(std::shared_ptr<logger> new_logger) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    auto it = log_levels_.find(new_logger->name());
+    auto new_level = it != log_levels_.end() ? it->second : global_log_level_;
+    new_logger->set_level(new_level);
+}
+
+SPDLOG_INLINE void registry::throw_if_exists_(const std::string &logger_name) {
+    if (loggers_.find(logger_name) != loggers_.end()) {
+        throw_spdlog_ex("logger with name '" + logger_name + "' already exists");
+    }
+}
+
+SPDLOG_INLINE void registry::register_logger_(std::shared_ptr<logger> new_logger) {
+    auto logger_name = new_logger->name();
+    throw_if_exists_(logger_name);
+    loggers_[logger_name] = std::move(new_logger);
+}
+
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/registry.h

@@ -1,214 +1,129 @@
-//
-// Copyright(c) 2015 Gabi Melman.
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
-//
 
 #pragma once
 
-// Loggers registy of unique name->logger pointer
-// An attempt to create a logger with an already existing name will be ignored
+// Loggers registry of unique name->logger pointer
+// An attempt to create a logger with an already existing name will result with spdlog_ex exception.
 // If user requests a non existing logger, nullptr will be returned
 // This class is thread safe
 
-#include "spdlog/common.h"
-#include "spdlog/details/periodic_worker.h"
-#include "spdlog/logger.h"
+#include <spdlog/common.h>
+#include <spdlog/details/periodic_worker.h>
 
 #include <chrono>
 #include <functional>
 #include <memory>
+#include <mutex>
 #include <string>
 #include <unordered_map>
 
 namespace spdlog {
+class logger;
+
 namespace details {
 class thread_pool;
 
-class registry
-{
+class SPDLOG_API registry {
 public:
+    using log_levels = std::unordered_map<std::string, level::level_enum>;
     registry(const registry &) = delete;
     registry &operator=(const registry &) = delete;
 
-    void register_logger(std::shared_ptr<logger> new_logger)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        auto logger_name = new_logger->name();
-        throw_if_exists_(logger_name);
-        loggers_[logger_name] = std::move(new_logger);
-    }
+    void register_logger(std::shared_ptr<logger> new_logger);
+    void initialize_logger(std::shared_ptr<logger> new_logger);
+    std::shared_ptr<logger> get(const std::string &logger_name);
+    std::shared_ptr<logger> default_logger();
 
-    void register_and_init(std::shared_ptr<logger> new_logger)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        auto logger_name = new_logger->name();
-        throw_if_exists_(logger_name);
+    // Return raw ptr to the default logger.
+    // To be used directly by the spdlog default api (e.g. spdlog::info)
+    // This make the default API faster, but cannot be used concurrently with set_default_logger().
+    // e.g do not call set_default_logger() from one thread while calling spdlog::info() from
+    // another.
+    logger *get_default_raw();
 
-        // set the global formatter pattern
-        new_logger->set_formatter(formatter_->clone());
+    // set default logger and add it to the registry if not registered already.
+    // default logger is stored in default_logger_ (for faster retrieval) and in the loggers_ map.
+    // Note: Make sure to unregister it when no longer needed or before calling again with a new
+    // logger.
+    void set_default_logger(std::shared_ptr<logger> new_default_logger);
 
-        if (err_handler_)
-        {
-            new_logger->set_error_handler(err_handler_);
-        }
+    void set_tp(std::shared_ptr<thread_pool> tp);
 
-        new_logger->set_level(level_);
-        new_logger->flush_on(flush_level_);
-
-        // add to registry
-        loggers_[logger_name] = std::move(new_logger);
-    }
-
-    std::shared_ptr<logger> get(const std::string &logger_name)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        auto found = loggers_.find(logger_name);
-        return found == loggers_.end() ? nullptr : found->second;
-    }
-
-    void set_tp(std::shared_ptr<thread_pool> tp)
-    {
-        std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
-        tp_ = std::move(tp);
-    }
-
-    std::shared_ptr<thread_pool> get_tp()
-    {
-        std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
-        return tp_;
-    }
+    std::shared_ptr<thread_pool> get_tp();
 
     // Set global formatter. Each sink in each logger will get a clone of this object
-    void set_formatter(std::unique_ptr<formatter> formatter)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        formatter_ = std::move(formatter);
-        for (auto &l : loggers_)
-        {
-            l.second->set_formatter(formatter_->clone());
-        }
-    }
+    void set_formatter(std::unique_ptr<formatter> formatter);
 
-    void set_level(level::level_enum log_level)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        for (auto &l : loggers_)
-        {
-            l.second->set_level(log_level);
-        }
-        level_ = log_level;
-    }
+    void enable_backtrace(size_t n_messages);
 
-    void flush_on(level::level_enum log_level)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        for (auto &l : loggers_)
-        {
-            l.second->flush_on(log_level);
-        }
-        flush_level_ = log_level;
-    }
+    void disable_backtrace();
 
-    void flush_every(std::chrono::seconds interval)
-    {
+    void set_level(level::level_enum log_level);
+
+    void flush_on(level::level_enum log_level);
+
+    template <typename Rep, typename Period>
+    void flush_every(std::chrono::duration<Rep, Period> interval) {
         std::lock_guard<std::mutex> lock(flusher_mutex_);
-        std::function<void()> clbk = std::bind(&registry::flush_all, this);
+        auto clbk = [this]() { this->flush_all(); };
         periodic_flusher_ = details::make_unique<periodic_worker>(clbk, interval);
     }
 
-    void set_error_handler(log_err_handler handler)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        for (auto &l : loggers_)
-        {
-            l.second->set_error_handler(handler);
-        }
-        err_handler_ = handler;
+    std::unique_ptr<periodic_worker> &get_flusher() {
+        std::lock_guard<std::mutex> lock(flusher_mutex_);
+        return periodic_flusher_;
     }
 
-    void apply_all(const std::function<void(const std::shared_ptr<logger>)> &fun)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        for (auto &l : loggers_)
-        {
-            fun(l.second);
-        }
-    }
+    void set_error_handler(err_handler handler);
 
-    void flush_all()
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        for (auto &l : loggers_)
-        {
-            l.second->flush();
-        }
-    }
+    void apply_all(const std::function<void(const std::shared_ptr<logger>)> &fun);
 
-    void drop(const std::string &logger_name)
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        loggers_.erase(logger_name);
-    }
+    void flush_all();
 
-    void drop_all()
-    {
-        std::lock_guard<std::mutex> lock(logger_map_mutex_);
-        loggers_.clear();
-    }
+    void drop(const std::string &logger_name);
 
-    // clean all reasources and threads started by the registry
-    void shutdown()
-    {
-        {
-            std::lock_guard<std::mutex> lock(flusher_mutex_);
-            periodic_flusher_.reset();
-        }
+    void drop_all();
 
-        drop_all();
+    // clean all resources and threads started by the registry
+    void shutdown();
 
-        {
-            std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
-            tp_.reset();
-        }
-    }
+    std::recursive_mutex &tp_mutex();
 
-    std::recursive_mutex &tp_mutex()
-    {
-        return tp_mutex_;
-    }
+    void set_automatic_registration(bool automatic_registration);
 
-    static registry &instance()
-    {
-        static registry s_instance;
-        return s_instance;
-    }
+    // set levels for all existing/future loggers. global_level can be null if should not set.
+    void set_levels(log_levels levels, level::level_enum *global_level);
+
+    static registry &instance();
+
+    void apply_logger_env_levels(std::shared_ptr<logger> new_logger);
 
 private:
-    registry()
-        : formatter_(new pattern_formatter("%+"))
-    {
-    }
-
-    ~registry() = default;
-
-    void throw_if_exists_(const std::string &logger_name)
-    {
-        if (loggers_.find(logger_name) != loggers_.end())
-        {
-            throw spdlog_ex("logger with name '" + logger_name + "' already exists");
-        }
-    }
+    registry();
+    ~registry();
 
+    void throw_if_exists_(const std::string &logger_name);
+    void register_logger_(std::shared_ptr<logger> new_logger);
+    bool set_level_from_cfg_(logger *logger);
     std::mutex logger_map_mutex_, flusher_mutex_;
     std::recursive_mutex tp_mutex_;
     std::unordered_map<std::string, std::shared_ptr<logger>> loggers_;
+    log_levels log_levels_;
     std::unique_ptr<formatter> formatter_;
-    level::level_enum level_ = level::info;
+    spdlog::level::level_enum global_log_level_ = level::info;
     level::level_enum flush_level_ = level::off;
-    log_err_handler err_handler_;
+    err_handler err_handler_;
     std::shared_ptr<thread_pool> tp_;
     std::unique_ptr<periodic_worker> periodic_flusher_;
+    std::shared_ptr<logger> default_logger_;
+    bool automatic_registration_ = true;
+    size_t backtrace_n_messages_ = 0;
 };
 
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "registry-inl.h"
+#endif

include/spdlog/details/synchronous_factory.h

@@ -0,0 +1,22 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include "registry.h"
+
+namespace spdlog {
+
+// Default logger factory-  creates synchronous loggers
+class logger;
+
+struct synchronous_factory {
+    template <typename Sink, typename... SinkArgs>
+    static std::shared_ptr<spdlog::logger> create(std::string logger_name, SinkArgs &&...args) {
+        auto sink = std::make_shared<Sink>(std::forward<SinkArgs>(args)...);
+        auto new_logger = std::make_shared<spdlog::logger>(std::move(logger_name), std::move(sink));
+        details::registry::instance().initialize_logger(new_logger);
+        return new_logger;
+    }
+};
+}  // namespace spdlog

include/spdlog/details/tcp_client-windows.h

@@ -0,0 +1,135 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN
+// tcp client helper
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+#include <windows.h>
+#include <winsock2.h>
+#include <ws2tcpip.h>
+
+#pragma comment(lib, "Ws2_32.lib")
+#pragma comment(lib, "Mswsock.lib")
+#pragma comment(lib, "AdvApi32.lib")
+
+namespace spdlog {
+namespace details {
+class tcp_client {
+    SOCKET socket_ = INVALID_SOCKET;
+
+    static void init_winsock_() {
+        WSADATA wsaData;
+        auto rv = WSAStartup(MAKEWORD(2, 2), &wsaData);
+        if (rv != 0) {
+            throw_winsock_error_("WSAStartup failed", ::WSAGetLastError());
+        }
+    }
+
+    static void throw_winsock_error_(const std::string &msg, int last_error) {
+        char buf[512];
+        ::FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
+                         last_error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buf,
+                         (sizeof(buf) / sizeof(char)), NULL);
+
+        throw_spdlog_ex(fmt_lib::format("tcp_sink - {}: {}", msg, buf));
+    }
+
+public:
+    tcp_client() { init_winsock_(); }
+
+    ~tcp_client() {
+        close();
+        ::WSACleanup();
+    }
+
+    bool is_connected() const { return socket_ != INVALID_SOCKET; }
+
+    void close() {
+        ::closesocket(socket_);
+        socket_ = INVALID_SOCKET;
+    }
+
+    SOCKET fd() const { return socket_; }
+
+    // try to connect or throw on failure
+    void connect(const std::string &host, int port) {
+        if (is_connected()) {
+            close();
+        }
+        struct addrinfo hints {};
+        ZeroMemory(&hints, sizeof(hints));
+
+        hints.ai_family = AF_UNSPEC;      // To work with IPv4, IPv6, and so on
+        hints.ai_socktype = SOCK_STREAM;  // TCP
+        hints.ai_flags = AI_NUMERICSERV;  // port passed as as numeric value
+        hints.ai_protocol = 0;
+
+        auto port_str = std::to_string(port);
+        struct addrinfo *addrinfo_result;
+        auto rv = ::getaddrinfo(host.c_str(), port_str.c_str(), &hints, &addrinfo_result);
+        int last_error = 0;
+        if (rv != 0) {
+            last_error = ::WSAGetLastError();
+            WSACleanup();
+            throw_winsock_error_("getaddrinfo failed", last_error);
+        }
+
+        // Try each address until we successfully connect(2).
+
+        for (auto *rp = addrinfo_result; rp != nullptr; rp = rp->ai_next) {
+            socket_ = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+            if (socket_ == INVALID_SOCKET) {
+                last_error = ::WSAGetLastError();
+                WSACleanup();
+                continue;
+            }
+            if (::connect(socket_, rp->ai_addr, (int)rp->ai_addrlen) == 0) {
+                break;
+            } else {
+                last_error = ::WSAGetLastError();
+                close();
+            }
+        }
+        ::freeaddrinfo(addrinfo_result);
+        if (socket_ == INVALID_SOCKET) {
+            WSACleanup();
+            throw_winsock_error_("connect failed", last_error);
+        }
+
+        // set TCP_NODELAY
+        int enable_flag = 1;
+        ::setsockopt(socket_, IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char *>(&enable_flag),
+                     sizeof(enable_flag));
+    }
+
+    // Send exactly n_bytes of the given data.
+    // On error close the connection and throw.
+    void send(const char *data, size_t n_bytes) {
+        size_t bytes_sent = 0;
+        while (bytes_sent < n_bytes) {
+            const int send_flags = 0;
+            auto write_result =
+                ::send(socket_, data + bytes_sent, (int)(n_bytes - bytes_sent), send_flags);
+            if (write_result == SOCKET_ERROR) {
+                int last_error = ::WSAGetLastError();
+                close();
+                throw_winsock_error_("send failed", last_error);
+            }
+
+            if (write_result == 0)  // (probably should not happen but in any case..)
+            {
+                break;
+            }
+            bytes_sent += static_cast<size_t>(write_result);
+        }
+    }
+};
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/tcp_client.h

@@ -0,0 +1,127 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifdef _WIN32
+    #error include tcp_client-windows.h instead
+#endif
+
+// tcp client helper
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <string>
+
+namespace spdlog {
+namespace details {
+class tcp_client {
+    int socket_ = -1;
+
+public:
+    bool is_connected() const { return socket_ != -1; }
+
+    void close() {
+        if (is_connected()) {
+            ::close(socket_);
+            socket_ = -1;
+        }
+    }
+
+    int fd() const { return socket_; }
+
+    ~tcp_client() { close(); }
+
+    // try to connect or throw on failure
+    void connect(const std::string &host, int port) {
+        close();
+        struct addrinfo hints {};
+        memset(&hints, 0, sizeof(struct addrinfo));
+        hints.ai_family = AF_UNSPEC;      // To work with IPv4, IPv6, and so on
+        hints.ai_socktype = SOCK_STREAM;  // TCP
+        hints.ai_flags = AI_NUMERICSERV;  // port passed as as numeric value
+        hints.ai_protocol = 0;
+
+        auto port_str = std::to_string(port);
+        struct addrinfo *addrinfo_result;
+        auto rv = ::getaddrinfo(host.c_str(), port_str.c_str(), &hints, &addrinfo_result);
+        if (rv != 0) {
+            throw_spdlog_ex(fmt_lib::format("::getaddrinfo failed: {}", gai_strerror(rv)));
+        }
+
+        // Try each address until we successfully connect(2).
+        int last_errno = 0;
+        for (auto *rp = addrinfo_result; rp != nullptr; rp = rp->ai_next) {
+#if defined(SOCK_CLOEXEC)
+            const int flags = SOCK_CLOEXEC;
+#else
+            const int flags = 0;
+#endif
+            socket_ = ::socket(rp->ai_family, rp->ai_socktype | flags, rp->ai_protocol);
+            if (socket_ == -1) {
+                last_errno = errno;
+                continue;
+            }
+            rv = ::connect(socket_, rp->ai_addr, rp->ai_addrlen);
+            if (rv == 0) {
+                break;
+            }
+            last_errno = errno;
+            ::close(socket_);
+            socket_ = -1;
+        }
+        ::freeaddrinfo(addrinfo_result);
+        if (socket_ == -1) {
+            throw_spdlog_ex("::connect failed", last_errno);
+        }
+
+        // set TCP_NODELAY
+        int enable_flag = 1;
+        ::setsockopt(socket_, IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char *>(&enable_flag),
+                     sizeof(enable_flag));
+
+        // prevent sigpipe on systems where MSG_NOSIGNAL is not available
+#if defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL)
+        ::setsockopt(socket_, SOL_SOCKET, SO_NOSIGPIPE, reinterpret_cast<char *>(&enable_flag),
+                     sizeof(enable_flag));
+#endif
+
+#if !defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL)
+    #error "tcp_sink would raise SIGPIPE since neither SO_NOSIGPIPE nor MSG_NOSIGNAL are available"
+#endif
+    }
+
+    // Send exactly n_bytes of the given data.
+    // On error close the connection and throw.
+    void send(const char *data, size_t n_bytes) {
+        size_t bytes_sent = 0;
+        while (bytes_sent < n_bytes) {
+#if defined(MSG_NOSIGNAL)
+            const int send_flags = MSG_NOSIGNAL;
+#else
+            const int send_flags = 0;
+#endif
+            auto write_result =
+                ::send(socket_, data + bytes_sent, n_bytes - bytes_sent, send_flags);
+            if (write_result < 0) {
+                close();
+                throw_spdlog_ex("write(2) failed", errno);
+            }
+
+            if (write_result == 0)  // (probably should not happen but in any case..)
+            {
+                break;
+            }
+            bytes_sent += static_cast<size_t>(write_result);
+        }
+    }
+};
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/thread_pool-inl.h

@@ -0,0 +1,126 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/thread_pool.h>
+#endif
+
+#include <cassert>
+#include <spdlog/common.h>
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE thread_pool::thread_pool(size_t q_max_items,
+                                       size_t threads_n,
+                                       std::function<void()> on_thread_start,
+                                       std::function<void()> on_thread_stop)
+    : q_(q_max_items) {
+    if (threads_n == 0 || threads_n > 1000) {
+        throw_spdlog_ex(
+            "spdlog::thread_pool(): invalid threads_n param (valid "
+            "range is 1-1000)");
+    }
+    for (size_t i = 0; i < threads_n; i++) {
+        threads_.emplace_back([this, on_thread_start, on_thread_stop] {
+            on_thread_start();
+            this->thread_pool::worker_loop_();
+            on_thread_stop();
+        });
+    }
+}
+
+SPDLOG_INLINE thread_pool::thread_pool(size_t q_max_items,
+                                       size_t threads_n,
+                                       std::function<void()> on_thread_start)
+    : thread_pool(q_max_items, threads_n, on_thread_start, [] {}) {}
+
+SPDLOG_INLINE thread_pool::thread_pool(size_t q_max_items, size_t threads_n)
+    : thread_pool(q_max_items, threads_n, [] {}, [] {}) {}
+
+// message all threads to terminate gracefully join them
+SPDLOG_INLINE thread_pool::~thread_pool() {
+    SPDLOG_TRY {
+        for (size_t i = 0; i < threads_.size(); i++) {
+            post_async_msg_(async_msg(async_msg_type::terminate), async_overflow_policy::block);
+        }
+
+        for (auto &t : threads_) {
+            t.join();
+        }
+    }
+    SPDLOG_CATCH_STD
+}
+
+void SPDLOG_INLINE thread_pool::post_log(async_logger_ptr &&worker_ptr,
+                                         const details::log_msg &msg,
+                                         async_overflow_policy overflow_policy) {
+    async_msg async_m(std::move(worker_ptr), async_msg_type::log, msg);
+    post_async_msg_(std::move(async_m), overflow_policy);
+}
+
+void SPDLOG_INLINE thread_pool::post_flush(async_logger_ptr &&worker_ptr,
+                                           async_overflow_policy overflow_policy) {
+    post_async_msg_(async_msg(std::move(worker_ptr), async_msg_type::flush), overflow_policy);
+}
+
+size_t SPDLOG_INLINE thread_pool::overrun_counter() { return q_.overrun_counter(); }
+
+void SPDLOG_INLINE thread_pool::reset_overrun_counter() { q_.reset_overrun_counter(); }
+
+size_t SPDLOG_INLINE thread_pool::discard_counter() { return q_.discard_counter(); }
+
+void SPDLOG_INLINE thread_pool::reset_discard_counter() { q_.reset_discard_counter(); }
+
+size_t SPDLOG_INLINE thread_pool::queue_size() { return q_.size(); }
+
+void SPDLOG_INLINE thread_pool::post_async_msg_(async_msg &&new_msg,
+                                                async_overflow_policy overflow_policy) {
+    if (overflow_policy == async_overflow_policy::block) {
+        q_.enqueue(std::move(new_msg));
+    } else if (overflow_policy == async_overflow_policy::overrun_oldest) {
+        q_.enqueue_nowait(std::move(new_msg));
+    } else {
+        assert(overflow_policy == async_overflow_policy::discard_new);
+        q_.enqueue_if_have_room(std::move(new_msg));
+    }
+}
+
+void SPDLOG_INLINE thread_pool::worker_loop_() {
+    while (process_next_msg_()) {
+    }
+}
+
+// process next message in the queue
+// return true if this thread should still be active (while no terminate msg
+// was received)
+bool SPDLOG_INLINE thread_pool::process_next_msg_() {
+    async_msg incoming_async_msg;
+    q_.dequeue(incoming_async_msg);
+
+    switch (incoming_async_msg.msg_type) {
+        case async_msg_type::log: {
+            incoming_async_msg.worker_ptr->backend_sink_it_(incoming_async_msg);
+            return true;
+        }
+        case async_msg_type::flush: {
+            incoming_async_msg.worker_ptr->backend_flush_();
+            return true;
+        }
+
+        case async_msg_type::terminate: {
+            return false;
+        }
+
+        default: {
+            assert(false);
+        }
+    }
+
+    return true;
+}
+
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/thread_pool.h

@@ -1,37 +1,31 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
 #pragma once
 
-#include "spdlog/details/log_msg.h"
-#include "spdlog/details/mpmc_blocking_q.h"
-#include "spdlog/details/os.h"
+#include <spdlog/details/log_msg_buffer.h>
+#include <spdlog/details/mpmc_blocking_q.h>
+#include <spdlog/details/os.h>
 
 #include <chrono>
+#include <functional>
 #include <memory>
 #include <thread>
 #include <vector>
 
 namespace spdlog {
+class async_logger;
+
 namespace details {
 
 using async_logger_ptr = std::shared_ptr<spdlog::async_logger>;
 
-enum class async_msg_type
-{
-    log,
-    flush,
-    terminate
-};
+enum class async_msg_type { log, flush, terminate };
 
 // Async msg to move to/from the queue
 // Movable only. should never be copied
-struct async_msg
-{
-    async_msg_type msg_type;
-    level::level_enum level;
-    log_clock::time_point time;
-    size_t thread_id;
-    fmt::basic_memory_buffer<char, 176> raw;
-
-    size_t msg_id;
+struct async_msg : log_msg_buffer {
+    async_msg_type msg_type{async_msg_type::log};
     async_logger_ptr worker_ptr;
 
     async_msg() = default;
@@ -42,187 +36,82 @@ struct async_msg
 
 // support for vs2013 move
 #if defined(_MSC_VER) && _MSC_VER <= 1800
-    async_msg(async_msg &&other) SPDLOG_NOEXCEPT : msg_type(other.msg_type),
-                                                   level(other.level),
-                                                   time(other.time),
-                                                   thread_id(other.thread_id),
-                                                   raw(move(other.raw)),
-                                                   msg_id(other.msg_id),
-                                                   worker_ptr(std::move(other.worker_ptr))
-    {
-    }
+    async_msg(async_msg &&other)
+        : log_msg_buffer(std::move(other)),
+          msg_type(other.msg_type),
+          worker_ptr(std::move(other.worker_ptr)) {}
 
-    async_msg &operator=(async_msg &&other) SPDLOG_NOEXCEPT
-    {
+    async_msg &operator=(async_msg &&other) {
+        *static_cast<log_msg_buffer *>(this) = std::move(other);
         msg_type = other.msg_type;
-        level = other.level;
-        time = other.time;
-        thread_id = other.thread_id;
-        raw = std::move(other.raw);
-        msg_id = other.msg_id;
         worker_ptr = std::move(other.worker_ptr);
         return *this;
     }
-#else // (_MSC_VER) && _MSC_VER <= 1800
+#else  // (_MSC_VER) && _MSC_VER <= 1800
     async_msg(async_msg &&) = default;
     async_msg &operator=(async_msg &&) = default;
 #endif
 
     // construct from log_msg with given type
-    async_msg(async_logger_ptr &&worker, async_msg_type the_type, details::log_msg &&m)
-        : msg_type(the_type)
-        , level(m.level)
-        , time(m.time)
-        , thread_id(m.thread_id)
-        , msg_id(m.msg_id)
-        , worker_ptr(std::move(worker))
-    {
-        fmt_helper::append_buf(m.raw, raw);
-    }
+    async_msg(async_logger_ptr &&worker, async_msg_type the_type, const details::log_msg &m)
+        : log_msg_buffer{m},
+          msg_type{the_type},
+          worker_ptr{std::move(worker)} {}
 
     async_msg(async_logger_ptr &&worker, async_msg_type the_type)
-        : async_msg(std::move(worker), the_type, details::log_msg())
-    {
-    }
+        : log_msg_buffer{},
+          msg_type{the_type},
+          worker_ptr{std::move(worker)} {}
 
     explicit async_msg(async_msg_type the_type)
-        : async_msg(nullptr, the_type, details::log_msg())
-    {
-    }
-
-    // copy into log_msg
-    void to_log_msg(log_msg &msg)
-    {
-        msg.logger_name = &worker_ptr->name();
-        msg.level = level;
-        msg.time = time;
-        msg.thread_id = thread_id;
-        fmt_helper::append_buf(raw, msg.raw);
-        msg.msg_id = msg_id;
-        msg.color_range_start = 0;
-        msg.color_range_end = 0;
-    }
+        : async_msg{nullptr, the_type} {}
 };
 
-class thread_pool
-{
+class SPDLOG_API thread_pool {
 public:
     using item_type = async_msg;
     using q_type = details::mpmc_blocking_queue<item_type>;
 
-    thread_pool(size_t q_max_items, size_t threads_n)
-        : q_(q_max_items)
-    {
-        // std::cout << "thread_pool()  q_size_bytes: " << q_size_bytes <<
-        // "\tthreads_n: " << threads_n << std::endl;
-        if (threads_n == 0 || threads_n > 1000)
-        {
-            throw spdlog_ex("spdlog::thread_pool(): invalid threads_n param (valid "
-                            "range is 1-1000)");
-        }
-        for (size_t i = 0; i < threads_n; i++)
-        {
-            threads_.emplace_back(&thread_pool::worker_loop_, this);
-        }
-    }
+    thread_pool(size_t q_max_items,
+                size_t threads_n,
+                std::function<void()> on_thread_start,
+                std::function<void()> on_thread_stop);
+    thread_pool(size_t q_max_items, size_t threads_n, std::function<void()> on_thread_start);
+    thread_pool(size_t q_max_items, size_t threads_n);
 
-    // message all threads to terminate gracefully join them
-    ~thread_pool()
-    {
-        try
-        {
-            for (size_t i = 0; i < threads_.size(); i++)
-            {
-                post_async_msg_(async_msg(async_msg_type::terminate), async_overflow_policy::block);
-            }
-
-            for (auto &t : threads_)
-            {
-                t.join();
-            }
-        }
-        catch (...)
-        {
-        }
-    }
+    // message all threads to terminate gracefully and join them
+    ~thread_pool();
 
     thread_pool(const thread_pool &) = delete;
     thread_pool &operator=(thread_pool &&) = delete;
 
-    void post_log(async_logger_ptr &&worker_ptr, details::log_msg &&msg, async_overflow_policy overflow_policy)
-    {
-        async_msg async_m(std::move(worker_ptr), async_msg_type::log, std::move(msg));
-        post_async_msg_(std::move(async_m), overflow_policy);
-    }
-
-    void post_flush(async_logger_ptr &&worker_ptr, async_overflow_policy overflow_policy)
-    {
-        post_async_msg_(async_msg(std::move(worker_ptr), async_msg_type::flush), overflow_policy);
-    }
-
-    size_t overrun_counter()
-    {
-        return q_.overrun_counter();
-    }
+    void post_log(async_logger_ptr &&worker_ptr,
+                  const details::log_msg &msg,
+                  async_overflow_policy overflow_policy);
+    void post_flush(async_logger_ptr &&worker_ptr, async_overflow_policy overflow_policy);
+    size_t overrun_counter();
+    void reset_overrun_counter();
+    size_t discard_counter();
+    void reset_discard_counter();
+    size_t queue_size();
 
 private:
     q_type q_;
 
     std::vector<std::thread> threads_;
 
-    void post_async_msg_(async_msg &&new_msg, async_overflow_policy overflow_policy)
-    {
-        if (overflow_policy == async_overflow_policy::block)
-        {
-            q_.enqueue(std::move(new_msg));
-        }
-        else
-        {
-            q_.enqueue_nowait(std::move(new_msg));
-        }
-    }
-
-    void worker_loop_()
-    {
-        while (process_next_msg_()) {};
-    }
+    void post_async_msg_(async_msg &&new_msg, async_overflow_policy overflow_policy);
+    void worker_loop_();
 
     // process next message in the queue
     // return true if this thread should still be active (while no terminate msg
     // was received)
-    bool process_next_msg_()
-    {
-        async_msg incoming_async_msg;
-        bool dequeued = q_.dequeue_for(incoming_async_msg, std::chrono::seconds(10));
-        if (!dequeued)
-        {
-            return true;
-        }
-
-        switch (incoming_async_msg.msg_type)
-        {
-        case async_msg_type::log:
-        {
-            log_msg msg;
-            incoming_async_msg.to_log_msg(msg);
-            incoming_async_msg.worker_ptr->backend_log_(msg);
-            return true;
-        }
-        case async_msg_type::flush:
-        {
-            incoming_async_msg.worker_ptr->backend_flush_();
-            return true;
-        }
-
-        case async_msg_type::terminate:
-        {
-            return false;
-        }
-        }
-        assert(false && "Unexpected async_msg_type");
-        return true;
-    }
+    bool process_next_msg_();
 };
 
-} // namespace details
-} // namespace spdlog
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "thread_pool-inl.h"
+#endif

include/spdlog/details/udp_client-windows.h

@@ -0,0 +1,98 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// Helper RAII over winsock udp client socket.
+// Will throw on construction if socket creation failed.
+
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+#include <spdlog/details/windows_include.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+#include <winsock2.h>
+#include <ws2tcpip.h>
+
+#if defined(_MSC_VER)
+    #pragma comment(lib, "Ws2_32.lib")
+    #pragma comment(lib, "Mswsock.lib")
+    #pragma comment(lib, "AdvApi32.lib")
+#endif
+
+namespace spdlog {
+namespace details {
+class udp_client {
+    static constexpr int TX_BUFFER_SIZE = 1024 * 10;
+    SOCKET socket_ = INVALID_SOCKET;
+    sockaddr_in addr_ = {};
+
+    static void init_winsock_() {
+        WSADATA wsaData;
+        auto rv = ::WSAStartup(MAKEWORD(2, 2), &wsaData);
+        if (rv != 0) {
+            throw_winsock_error_("WSAStartup failed", ::WSAGetLastError());
+        }
+    }
+
+    static void throw_winsock_error_(const std::string &msg, int last_error) {
+        char buf[512];
+        ::FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
+                         last_error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buf,
+                         (sizeof(buf) / sizeof(char)), NULL);
+
+        throw_spdlog_ex(fmt_lib::format("udp_sink - {}: {}", msg, buf));
+    }
+
+    void cleanup_() {
+        if (socket_ != INVALID_SOCKET) {
+            ::closesocket(socket_);
+        }
+        socket_ = INVALID_SOCKET;
+        ::WSACleanup();
+    }
+
+public:
+    udp_client(const std::string &host, uint16_t port) {
+        init_winsock_();
+
+        addr_.sin_family = PF_INET;
+        addr_.sin_port = htons(port);
+        addr_.sin_addr.s_addr = INADDR_ANY;
+        if (InetPtonA(PF_INET, host.c_str(), &addr_.sin_addr.s_addr) != 1) {
+            int last_error = ::WSAGetLastError();
+            ::WSACleanup();
+            throw_winsock_error_("error: Invalid address!", last_error);
+        }
+
+        socket_ = ::socket(PF_INET, SOCK_DGRAM, 0);
+        if (socket_ == INVALID_SOCKET) {
+            int last_error = ::WSAGetLastError();
+            ::WSACleanup();
+            throw_winsock_error_("error: Create Socket failed", last_error);
+        }
+
+        int option_value = TX_BUFFER_SIZE;
+        if (::setsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
+                         reinterpret_cast<const char *>(&option_value), sizeof(option_value)) < 0) {
+            int last_error = ::WSAGetLastError();
+            cleanup_();
+            throw_winsock_error_("error: setsockopt(SO_SNDBUF) Failed!", last_error);
+        }
+    }
+
+    ~udp_client() { cleanup_(); }
+
+    SOCKET fd() const { return socket_; }
+
+    void send(const char *data, size_t n_bytes) {
+        socklen_t tolen = sizeof(struct sockaddr);
+        if (::sendto(socket_, data, static_cast<int>(n_bytes), 0, (struct sockaddr *)&addr_,
+                     tolen) == -1) {
+            throw_spdlog_ex("sendto(2) failed", errno);
+        }
+    }
+};
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/udp_client.h

@@ -0,0 +1,81 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// Helper RAII over unix udp client socket.
+// Will throw on construction if the socket creation failed.
+
+#ifdef _WIN32
+    #error "include udp_client-windows.h instead"
+#endif
+
+#include <arpa/inet.h>
+#include <cstring>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <netinet/udp.h>
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <string>
+
+namespace spdlog {
+namespace details {
+
+class udp_client {
+    static constexpr int TX_BUFFER_SIZE = 1024 * 10;
+    int socket_ = -1;
+    struct sockaddr_in sockAddr_;
+
+    void cleanup_() {
+        if (socket_ != -1) {
+            ::close(socket_);
+            socket_ = -1;
+        }
+    }
+
+public:
+    udp_client(const std::string &host, uint16_t port) {
+        socket_ = ::socket(PF_INET, SOCK_DGRAM, 0);
+        if (socket_ < 0) {
+            throw_spdlog_ex("error: Create Socket Failed!");
+        }
+
+        int option_value = TX_BUFFER_SIZE;
+        if (::setsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
+                         reinterpret_cast<const char *>(&option_value), sizeof(option_value)) < 0) {
+            cleanup_();
+            throw_spdlog_ex("error: setsockopt(SO_SNDBUF) Failed!");
+        }
+
+        sockAddr_.sin_family = AF_INET;
+        sockAddr_.sin_port = htons(port);
+
+        if (::inet_aton(host.c_str(), &sockAddr_.sin_addr) == 0) {
+            cleanup_();
+            throw_spdlog_ex("error: Invalid address!");
+        }
+
+        ::memset(sockAddr_.sin_zero, 0x00, sizeof(sockAddr_.sin_zero));
+    }
+
+    ~udp_client() { cleanup_(); }
+
+    int fd() const { return socket_; }
+
+    // Send exactly n_bytes of the given data.
+    // On error close the connection and throw.
+    void send(const char *data, size_t n_bytes) {
+        ssize_t toslen = 0;
+        socklen_t tolen = sizeof(struct sockaddr);
+        if ((toslen = ::sendto(socket_, data, n_bytes, 0, (struct sockaddr *)&sockAddr_, tolen)) ==
+            -1) {
+            throw_spdlog_ex("sendto(2) failed", errno);
+        }
+    }
+};
+}  // namespace details
+}  // namespace spdlog

include/spdlog/details/windows_include.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#ifndef NOMINMAX
+    #define NOMINMAX  // prevent windows redefining min/max
+#endif
+
+#ifndef WIN32_LEAN_AND_MEAN
+    #define WIN32_LEAN_AND_MEAN
+#endif
+
+#include <windows.h>

include/spdlog/fmt/bin_to_hex.h

@@ -5,13 +5,27 @@
 
 #pragma once
 
+#include <cctype>
+#include <spdlog/common.h>
+
+#if defined(__has_include)
+    #if __has_include(<version>)
+        #include <version>
+    #endif
+#endif
+
+#if __cpp_lib_span >= 202002L
+    #include <span>
+#endif
+
 //
 // Support for logging binary data as hex
-// format flags:
+// format flags, any combination of the following:
 // {:X} - print in uppercase.
 // {:s} - don't separate each byte with space.
 // {:p} - don't print the position on each line start.
 // {:n} - don't split the output to lines.
+// {:a} - show ASCII if :n is not set
 
 //
 // Examples:
@@ -20,86 +34,105 @@
 // logger->info("Some buffer {}", spdlog::to_hex(v));
 // char buf[128];
 // logger->info("Some buffer {:X}", spdlog::to_hex(std::begin(buf), std::end(buf)));
+// logger->info("Some buffer {:X}", spdlog::to_hex(std::begin(buf), std::end(buf), 16));
 
 namespace spdlog {
 namespace details {
 
-template<typename It>
-class bytes_range
-{
+template <typename It>
+class dump_info {
 public:
-    bytes_range(It range_begin, It range_end)
-        : begin_(range_begin)
-        , end_(range_end)
-    {
-    }
+    dump_info(It range_begin, It range_end, size_t size_per_line)
+        : begin_(range_begin),
+          end_(range_end),
+          size_per_line_(size_per_line) {}
 
-    It begin() const
-    {
-        return begin_;
-    }
-    It end() const
-    {
-        return end_;
-    }
+    // do not use begin() and end() to avoid collision with fmt/ranges
+    It get_begin() const { return begin_; }
+    It get_end() const { return end_; }
+    size_t size_per_line() const { return size_per_line_; }
 
 private:
     It begin_, end_;
+    size_t size_per_line_;
 };
-} // namespace details
+}  // namespace details
 
-// create a bytes_range that wraps the given container
-template<typename Container>
-inline details::bytes_range<typename Container::const_iterator> to_hex(const Container &container)
-{
-    static_assert(sizeof(typename Container::value_type) == 1, "sizeof(Container::value_type) != 1");
+// create a dump_info that wraps the given container
+template <typename Container>
+inline details::dump_info<typename Container::const_iterator> to_hex(const Container &container,
+                                                                     size_t size_per_line = 32) {
+    static_assert(sizeof(typename Container::value_type) == 1,
+                  "sizeof(Container::value_type) != 1");
     using Iter = typename Container::const_iterator;
-    return details::bytes_range<Iter>(std::begin(container), std::end(container));
+    return details::dump_info<Iter>(std::begin(container), std::end(container), size_per_line);
 }
 
-// create bytes_range from ranges
-template<typename It>
-inline details::bytes_range<It> to_hex(const It range_begin, const It range_end)
-{
-    return details::bytes_range<It>(range_begin, range_end);
+#if __cpp_lib_span >= 202002L
+
+template <typename Value, size_t Extent>
+inline details::dump_info<typename std::span<Value, Extent>::iterator> to_hex(
+    const std::span<Value, Extent> &container, size_t size_per_line = 32) {
+    using Container = std::span<Value, Extent>;
+    static_assert(sizeof(typename Container::value_type) == 1,
+                  "sizeof(Container::value_type) != 1");
+    using Iter = typename Container::iterator;
+    return details::dump_info<Iter>(std::begin(container), std::end(container), size_per_line);
 }
 
-} // namespace spdlog
+#endif
 
-namespace fmt {
+// create dump_info from ranges
+template <typename It>
+inline details::dump_info<It> to_hex(const It range_begin,
+                                     const It range_end,
+                                     size_t size_per_line = 32) {
+    return details::dump_info<It>(range_begin, range_end, size_per_line);
+}
 
-template<typename T>
-struct formatter<spdlog::details::bytes_range<T>>
+}  // namespace spdlog
+
+namespace
+#ifdef SPDLOG_USE_STD_FORMAT
+    std
+#else
+    fmt
+#endif
 {
-    const std::size_t line_size = 100;
-    const char delimiter = ' ';
 
+template <typename T>
+struct formatter<spdlog::details::dump_info<T>, char> {
+    char delimiter = ' ';
     bool put_newlines = true;
     bool put_delimiters = true;
     bool use_uppercase = false;
-    bool put_positions = true; // position on start of each line
+    bool put_positions = true;  // position on start of each line
+    bool show_ascii = false;
 
     // parse the format string flags
-    template<typename ParseContext>
-    auto parse(ParseContext &ctx) -> decltype(ctx.begin())
-    {
+    template <typename ParseContext>
+    SPDLOG_CONSTEXPR_FUNC auto parse(ParseContext &ctx) -> decltype(ctx.begin()) {
         auto it = ctx.begin();
-        while (*it && *it != '}')
-        {
-            switch (*it)
-            {
-            case 'X':
-                use_uppercase = true;
-                break;
-            case 's':
-                put_delimiters = false;
-                break;
-            case 'p':
-                put_positions = false;
-                break;
-            case 'n':
-                put_newlines = false;
-                break;
+        while (it != ctx.end() && *it != '}') {
+            switch (*it) {
+                case 'X':
+                    use_uppercase = true;
+                    break;
+                case 's':
+                    put_delimiters = false;
+                    break;
+                case 'p':
+                    put_positions = false;
+                    break;
+                case 'n':
+                    put_newlines = false;
+                    show_ascii = false;
+                    break;
+                case 'a':
+                    if (put_newlines) {
+                        show_ascii = true;
+                    }
+                    break;
             }
 
             ++it;
@@ -108,65 +141,84 @@ struct formatter<spdlog::details::bytes_range<T>>
     }
 
     // format the given bytes range as hex
-    template<typename FormatContext, typename Container>
-    auto format(const spdlog::details::bytes_range<Container> &the_range, FormatContext &ctx) -> decltype(ctx.out())
-    {
-        constexpr const char *hex_upper = "0123456789ABCDEF";
-        constexpr const char *hex_lower = "0123456789abcdef";
+    template <typename FormatContext, typename Container>
+    auto format(const spdlog::details::dump_info<Container> &the_range,
+                FormatContext &ctx) const -> decltype(ctx.out()) {
+        SPDLOG_CONSTEXPR const char *hex_upper = "0123456789ABCDEF";
+        SPDLOG_CONSTEXPR const char *hex_lower = "0123456789abcdef";
         const char *hex_chars = use_uppercase ? hex_upper : hex_lower;
 
-        std::size_t pos = 0;
-        std::size_t column = line_size;
+#if !defined(SPDLOG_USE_STD_FORMAT) && FMT_VERSION < 60000
         auto inserter = ctx.begin();
+#else
+        auto inserter = ctx.out();
+#endif
 
-        for (auto &item : the_range)
-        {
-            auto ch = static_cast<unsigned char>(item);
-            pos++;
+        int size_per_line = static_cast<int>(the_range.size_per_line());
+        auto start_of_line = the_range.get_begin();
+        for (auto i = the_range.get_begin(); i != the_range.get_end(); i++) {
+            auto ch = static_cast<unsigned char>(*i);
 
-            if (put_newlines && column >= line_size)
-            {
-                column = put_newline(inserter, pos);
+            if (put_newlines &&
+                (i == the_range.get_begin() || i - start_of_line >= size_per_line)) {
+                if (show_ascii && i != the_range.get_begin()) {
+                    *inserter++ = delimiter;
+                    *inserter++ = delimiter;
+                    for (auto j = start_of_line; j < i; j++) {
+                        auto pc = static_cast<unsigned char>(*j);
+                        *inserter++ = std::isprint(pc) ? static_cast<char>(*j) : '.';
+                    }
+                }
+
+                put_newline(inserter, static_cast<size_t>(i - the_range.get_begin()));
 
                 // put first byte without delimiter in front of it
                 *inserter++ = hex_chars[(ch >> 4) & 0x0f];
                 *inserter++ = hex_chars[ch & 0x0f];
-                column += 2;
+                start_of_line = i;
                 continue;
             }
 
-            if (put_delimiters)
-            {
+            if (put_delimiters && i != the_range.get_begin()) {
                 *inserter++ = delimiter;
-                ++column;
             }
 
             *inserter++ = hex_chars[(ch >> 4) & 0x0f];
             *inserter++ = hex_chars[ch & 0x0f];
-            column += 2;
+        }
+        if (show_ascii)  // add ascii to last line
+        {
+            if (the_range.get_end() - the_range.get_begin() > size_per_line) {
+                auto blank_num = size_per_line - (the_range.get_end() - start_of_line);
+                while (blank_num-- > 0) {
+                    *inserter++ = delimiter;
+                    *inserter++ = delimiter;
+                    if (put_delimiters) {
+                        *inserter++ = delimiter;
+                    }
+                }
+            }
+            *inserter++ = delimiter;
+            *inserter++ = delimiter;
+            for (auto j = start_of_line; j != the_range.get_end(); j++) {
+                auto pc = static_cast<unsigned char>(*j);
+                *inserter++ = std::isprint(pc) ? static_cast<char>(*j) : '.';
+            }
         }
         return inserter;
     }
 
     // put newline(and position header)
-    // return the next column
-    template<typename It>
-    std::size_t put_newline(It inserter, std::size_t pos)
-    {
+    template <typename It>
+    void put_newline(It inserter, std::size_t pos) const {
 #ifdef _WIN32
         *inserter++ = '\r';
 #endif
         *inserter++ = '\n';
 
-        if (put_positions)
-        {
-            fmt::format_to(inserter, "{:<04X}: ", pos - 1);
-            return 7;
-        }
-        else
-        {
-            return 1;
+        if (put_positions) {
+            spdlog::fmt_lib::format_to(inserter, SPDLOG_FMT_STRING("{:04X}: "), pos);
         }
     }
 };
-} // namespace fmt
+}  // namespace std

include/spdlog/fmt/bundled/LICENSE.rst

@@ -1,23 +0,0 @@
-Copyright (c) 2012 - 2016, Victor Zverovich
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright notice, this
-   list of conditions and the following disclaimer.
-2. Redistributions in binary form must reproduce the above copyright notice,
-   this list of conditions and the following disclaimer in the documentation
-   and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

include/spdlog/fmt/bundled/args.h

@@ -0,0 +1,220 @@
+// Formatting library for C++ - dynamic argument lists
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_ARGS_H_
+#define FMT_ARGS_H_
+
+#ifndef FMT_MODULE
+#  include <functional>  // std::reference_wrapper
+#  include <memory>      // std::unique_ptr
+#  include <vector>
+#endif
+
+#include "format.h"  // std_string_view
+
+FMT_BEGIN_NAMESPACE
+namespace detail {
+
+template <typename T> struct is_reference_wrapper : std::false_type {};
+template <typename T>
+struct is_reference_wrapper<std::reference_wrapper<T>> : std::true_type {};
+
+template <typename T> auto unwrap(const T& v) -> const T& { return v; }
+template <typename T>
+auto unwrap(const std::reference_wrapper<T>& v) -> const T& {
+  return static_cast<const T&>(v);
+}
+
+// node is defined outside dynamic_arg_list to workaround a C2504 bug in MSVC
+// 2022 (v17.10.0).
+//
+// Workaround for clang's -Wweak-vtables. Unlike for regular classes, for
+// templates it doesn't complain about inability to deduce single translation
+// unit for placing vtable. So node is made a fake template.
+template <typename = void> struct node {
+  virtual ~node() = default;
+  std::unique_ptr<node<>> next;
+};
+
+class dynamic_arg_list {
+  template <typename T> struct typed_node : node<> {
+    T value;
+
+    template <typename Arg>
+    FMT_CONSTEXPR typed_node(const Arg& arg) : value(arg) {}
+
+    template <typename Char>
+    FMT_CONSTEXPR typed_node(const basic_string_view<Char>& arg)
+        : value(arg.data(), arg.size()) {}
+  };
+
+  std::unique_ptr<node<>> head_;
+
+ public:
+  template <typename T, typename Arg> auto push(const Arg& arg) -> const T& {
+    auto new_node = std::unique_ptr<typed_node<T>>(new typed_node<T>(arg));
+    auto& value = new_node->value;
+    new_node->next = std::move(head_);
+    head_ = std::move(new_node);
+    return value;
+  }
+};
+}  // namespace detail
+
+/**
+ * A dynamic list of formatting arguments with storage.
+ *
+ * It can be implicitly converted into `fmt::basic_format_args` for passing
+ * into type-erased formatting functions such as `fmt::vformat`.
+ */
+template <typename Context> class dynamic_format_arg_store {
+ private:
+  using char_type = typename Context::char_type;
+
+  template <typename T> struct need_copy {
+    static constexpr detail::type mapped_type =
+        detail::mapped_type_constant<T, char_type>::value;
+
+    enum {
+      value = !(detail::is_reference_wrapper<T>::value ||
+                std::is_same<T, basic_string_view<char_type>>::value ||
+                std::is_same<T, detail::std_string_view<char_type>>::value ||
+                (mapped_type != detail::type::cstring_type &&
+                 mapped_type != detail::type::string_type &&
+                 mapped_type != detail::type::custom_type))
+    };
+  };
+
+  template <typename T>
+  using stored_t = conditional_t<
+      std::is_convertible<T, std::basic_string<char_type>>::value &&
+          !detail::is_reference_wrapper<T>::value,
+      std::basic_string<char_type>, T>;
+
+  // Storage of basic_format_arg must be contiguous.
+  std::vector<basic_format_arg<Context>> data_;
+  std::vector<detail::named_arg_info<char_type>> named_info_;
+
+  // Storage of arguments not fitting into basic_format_arg must grow
+  // without relocation because items in data_ refer to it.
+  detail::dynamic_arg_list dynamic_args_;
+
+  friend class basic_format_args<Context>;
+
+  auto data() const -> const basic_format_arg<Context>* {
+    return named_info_.empty() ? data_.data() : data_.data() + 1;
+  }
+
+  template <typename T> void emplace_arg(const T& arg) {
+    data_.emplace_back(arg);
+  }
+
+  template <typename T>
+  void emplace_arg(const detail::named_arg<char_type, T>& arg) {
+    if (named_info_.empty())
+      data_.insert(data_.begin(), basic_format_arg<Context>(nullptr, 0));
+    data_.emplace_back(detail::unwrap(arg.value));
+    auto pop_one = [](std::vector<basic_format_arg<Context>>* data) {
+      data->pop_back();
+    };
+    std::unique_ptr<std::vector<basic_format_arg<Context>>, decltype(pop_one)>
+        guard{&data_, pop_one};
+    named_info_.push_back({arg.name, static_cast<int>(data_.size() - 2u)});
+    data_[0] = {named_info_.data(), named_info_.size()};
+    guard.release();
+  }
+
+ public:
+  constexpr dynamic_format_arg_store() = default;
+
+  operator basic_format_args<Context>() const {
+    return basic_format_args<Context>(data(), static_cast<int>(data_.size()),
+                                      !named_info_.empty());
+  }
+
+  /**
+   * Adds an argument into the dynamic store for later passing to a formatting
+   * function.
+   *
+   * Note that custom types and string types (but not string views) are copied
+   * into the store dynamically allocating memory if necessary.
+   *
+   * **Example**:
+   *
+   *     fmt::dynamic_format_arg_store<fmt::format_context> store;
+   *     store.push_back(42);
+   *     store.push_back("abc");
+   *     store.push_back(1.5f);
+   *     std::string result = fmt::vformat("{} and {} and {}", store);
+   */
+  template <typename T> void push_back(const T& arg) {
+    if (detail::const_check(need_copy<T>::value))
+      emplace_arg(dynamic_args_.push<stored_t<T>>(arg));
+    else
+      emplace_arg(detail::unwrap(arg));
+  }
+
+  /**
+   * Adds a reference to the argument into the dynamic store for later passing
+   * to a formatting function.
+   *
+   * **Example**:
+   *
+   *     fmt::dynamic_format_arg_store<fmt::format_context> store;
+   *     char band[] = "Rolling Stones";
+   *     store.push_back(std::cref(band));
+   *     band[9] = 'c'; // Changing str affects the output.
+   *     std::string result = fmt::vformat("{}", store);
+   *     // result == "Rolling Scones"
+   */
+  template <typename T> void push_back(std::reference_wrapper<T> arg) {
+    static_assert(
+        need_copy<T>::value,
+        "objects of built-in types and string views are always copied");
+    emplace_arg(arg.get());
+  }
+
+  /**
+   * Adds named argument into the dynamic store for later passing to a
+   * formatting function. `std::reference_wrapper` is supported to avoid
+   * copying of the argument. The name is always copied into the store.
+   */
+  template <typename T>
+  void push_back(const detail::named_arg<char_type, T>& arg) {
+    const char_type* arg_name =
+        dynamic_args_.push<std::basic_string<char_type>>(arg.name).c_str();
+    if (detail::const_check(need_copy<T>::value)) {
+      emplace_arg(
+          fmt::arg(arg_name, dynamic_args_.push<stored_t<T>>(arg.value)));
+    } else {
+      emplace_arg(fmt::arg(arg_name, arg.value));
+    }
+  }
+
+  /// Erase all elements from the store.
+  void clear() {
+    data_.clear();
+    named_info_.clear();
+    dynamic_args_ = {};
+  }
+
+  /// Reserves space to store at least `new_cap` arguments including
+  /// `new_cap_named` named arguments.
+  void reserve(size_t new_cap, size_t new_cap_named) {
+    FMT_ASSERT(new_cap >= new_cap_named,
+               "set of arguments includes set of named arguments");
+    data_.reserve(new_cap);
+    named_info_.reserve(new_cap_named);
+  }
+
+  /// Returns the number of elements in the store.
+  size_t size() const noexcept { return data_.size(); }
+};
+
+FMT_END_NAMESPACE
+
+#endif  // FMT_ARGS_H_

include/spdlog/fmt/bundled/color.h

@@ -0,0 +1,610 @@
+// Formatting library for C++ - color support
+//
+// Copyright (c) 2018 - present, Victor Zverovich and fmt contributors
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_COLOR_H_
+#define FMT_COLOR_H_
+
+#include "format.h"
+
+FMT_BEGIN_NAMESPACE
+FMT_BEGIN_EXPORT
+
+enum class color : uint32_t {
+  alice_blue = 0xF0F8FF,               // rgb(240,248,255)
+  antique_white = 0xFAEBD7,            // rgb(250,235,215)
+  aqua = 0x00FFFF,                     // rgb(0,255,255)
+  aquamarine = 0x7FFFD4,               // rgb(127,255,212)
+  azure = 0xF0FFFF,                    // rgb(240,255,255)
+  beige = 0xF5F5DC,                    // rgb(245,245,220)
+  bisque = 0xFFE4C4,                   // rgb(255,228,196)
+  black = 0x000000,                    // rgb(0,0,0)
+  blanched_almond = 0xFFEBCD,          // rgb(255,235,205)
+  blue = 0x0000FF,                     // rgb(0,0,255)
+  blue_violet = 0x8A2BE2,              // rgb(138,43,226)
+  brown = 0xA52A2A,                    // rgb(165,42,42)
+  burly_wood = 0xDEB887,               // rgb(222,184,135)
+  cadet_blue = 0x5F9EA0,               // rgb(95,158,160)
+  chartreuse = 0x7FFF00,               // rgb(127,255,0)
+  chocolate = 0xD2691E,                // rgb(210,105,30)
+  coral = 0xFF7F50,                    // rgb(255,127,80)
+  cornflower_blue = 0x6495ED,          // rgb(100,149,237)
+  cornsilk = 0xFFF8DC,                 // rgb(255,248,220)
+  crimson = 0xDC143C,                  // rgb(220,20,60)
+  cyan = 0x00FFFF,                     // rgb(0,255,255)
+  dark_blue = 0x00008B,                // rgb(0,0,139)
+  dark_cyan = 0x008B8B,                // rgb(0,139,139)
+  dark_golden_rod = 0xB8860B,          // rgb(184,134,11)
+  dark_gray = 0xA9A9A9,                // rgb(169,169,169)
+  dark_green = 0x006400,               // rgb(0,100,0)
+  dark_khaki = 0xBDB76B,               // rgb(189,183,107)
+  dark_magenta = 0x8B008B,             // rgb(139,0,139)
+  dark_olive_green = 0x556B2F,         // rgb(85,107,47)
+  dark_orange = 0xFF8C00,              // rgb(255,140,0)
+  dark_orchid = 0x9932CC,              // rgb(153,50,204)
+  dark_red = 0x8B0000,                 // rgb(139,0,0)
+  dark_salmon = 0xE9967A,              // rgb(233,150,122)
+  dark_sea_green = 0x8FBC8F,           // rgb(143,188,143)
+  dark_slate_blue = 0x483D8B,          // rgb(72,61,139)
+  dark_slate_gray = 0x2F4F4F,          // rgb(47,79,79)
+  dark_turquoise = 0x00CED1,           // rgb(0,206,209)
+  dark_violet = 0x9400D3,              // rgb(148,0,211)
+  deep_pink = 0xFF1493,                // rgb(255,20,147)
+  deep_sky_blue = 0x00BFFF,            // rgb(0,191,255)
+  dim_gray = 0x696969,                 // rgb(105,105,105)
+  dodger_blue = 0x1E90FF,              // rgb(30,144,255)
+  fire_brick = 0xB22222,               // rgb(178,34,34)
+  floral_white = 0xFFFAF0,             // rgb(255,250,240)
+  forest_green = 0x228B22,             // rgb(34,139,34)
+  fuchsia = 0xFF00FF,                  // rgb(255,0,255)
+  gainsboro = 0xDCDCDC,                // rgb(220,220,220)
+  ghost_white = 0xF8F8FF,              // rgb(248,248,255)
+  gold = 0xFFD700,                     // rgb(255,215,0)
+  golden_rod = 0xDAA520,               // rgb(218,165,32)
+  gray = 0x808080,                     // rgb(128,128,128)
+  green = 0x008000,                    // rgb(0,128,0)
+  green_yellow = 0xADFF2F,             // rgb(173,255,47)
+  honey_dew = 0xF0FFF0,                // rgb(240,255,240)
+  hot_pink = 0xFF69B4,                 // rgb(255,105,180)
+  indian_red = 0xCD5C5C,               // rgb(205,92,92)
+  indigo = 0x4B0082,                   // rgb(75,0,130)
+  ivory = 0xFFFFF0,                    // rgb(255,255,240)
+  khaki = 0xF0E68C,                    // rgb(240,230,140)
+  lavender = 0xE6E6FA,                 // rgb(230,230,250)
+  lavender_blush = 0xFFF0F5,           // rgb(255,240,245)
+  lawn_green = 0x7CFC00,               // rgb(124,252,0)
+  lemon_chiffon = 0xFFFACD,            // rgb(255,250,205)
+  light_blue = 0xADD8E6,               // rgb(173,216,230)
+  light_coral = 0xF08080,              // rgb(240,128,128)
+  light_cyan = 0xE0FFFF,               // rgb(224,255,255)
+  light_golden_rod_yellow = 0xFAFAD2,  // rgb(250,250,210)
+  light_gray = 0xD3D3D3,               // rgb(211,211,211)
+  light_green = 0x90EE90,              // rgb(144,238,144)
+  light_pink = 0xFFB6C1,               // rgb(255,182,193)
+  light_salmon = 0xFFA07A,             // rgb(255,160,122)
+  light_sea_green = 0x20B2AA,          // rgb(32,178,170)
+  light_sky_blue = 0x87CEFA,           // rgb(135,206,250)
+  light_slate_gray = 0x778899,         // rgb(119,136,153)
+  light_steel_blue = 0xB0C4DE,         // rgb(176,196,222)
+  light_yellow = 0xFFFFE0,             // rgb(255,255,224)
+  lime = 0x00FF00,                     // rgb(0,255,0)
+  lime_green = 0x32CD32,               // rgb(50,205,50)
+  linen = 0xFAF0E6,                    // rgb(250,240,230)
+  magenta = 0xFF00FF,                  // rgb(255,0,255)
+  maroon = 0x800000,                   // rgb(128,0,0)
+  medium_aquamarine = 0x66CDAA,        // rgb(102,205,170)
+  medium_blue = 0x0000CD,              // rgb(0,0,205)
+  medium_orchid = 0xBA55D3,            // rgb(186,85,211)
+  medium_purple = 0x9370DB,            // rgb(147,112,219)
+  medium_sea_green = 0x3CB371,         // rgb(60,179,113)
+  medium_slate_blue = 0x7B68EE,        // rgb(123,104,238)
+  medium_spring_green = 0x00FA9A,      // rgb(0,250,154)
+  medium_turquoise = 0x48D1CC,         // rgb(72,209,204)
+  medium_violet_red = 0xC71585,        // rgb(199,21,133)
+  midnight_blue = 0x191970,            // rgb(25,25,112)
+  mint_cream = 0xF5FFFA,               // rgb(245,255,250)
+  misty_rose = 0xFFE4E1,               // rgb(255,228,225)
+  moccasin = 0xFFE4B5,                 // rgb(255,228,181)
+  navajo_white = 0xFFDEAD,             // rgb(255,222,173)
+  navy = 0x000080,                     // rgb(0,0,128)
+  old_lace = 0xFDF5E6,                 // rgb(253,245,230)
+  olive = 0x808000,                    // rgb(128,128,0)
+  olive_drab = 0x6B8E23,               // rgb(107,142,35)
+  orange = 0xFFA500,                   // rgb(255,165,0)
+  orange_red = 0xFF4500,               // rgb(255,69,0)
+  orchid = 0xDA70D6,                   // rgb(218,112,214)
+  pale_golden_rod = 0xEEE8AA,          // rgb(238,232,170)
+  pale_green = 0x98FB98,               // rgb(152,251,152)
+  pale_turquoise = 0xAFEEEE,           // rgb(175,238,238)
+  pale_violet_red = 0xDB7093,          // rgb(219,112,147)
+  papaya_whip = 0xFFEFD5,              // rgb(255,239,213)
+  peach_puff = 0xFFDAB9,               // rgb(255,218,185)
+  peru = 0xCD853F,                     // rgb(205,133,63)
+  pink = 0xFFC0CB,                     // rgb(255,192,203)
+  plum = 0xDDA0DD,                     // rgb(221,160,221)
+  powder_blue = 0xB0E0E6,              // rgb(176,224,230)
+  purple = 0x800080,                   // rgb(128,0,128)
+  rebecca_purple = 0x663399,           // rgb(102,51,153)
+  red = 0xFF0000,                      // rgb(255,0,0)
+  rosy_brown = 0xBC8F8F,               // rgb(188,143,143)
+  royal_blue = 0x4169E1,               // rgb(65,105,225)
+  saddle_brown = 0x8B4513,             // rgb(139,69,19)
+  salmon = 0xFA8072,                   // rgb(250,128,114)
+  sandy_brown = 0xF4A460,              // rgb(244,164,96)
+  sea_green = 0x2E8B57,                // rgb(46,139,87)
+  sea_shell = 0xFFF5EE,                // rgb(255,245,238)
+  sienna = 0xA0522D,                   // rgb(160,82,45)
+  silver = 0xC0C0C0,                   // rgb(192,192,192)
+  sky_blue = 0x87CEEB,                 // rgb(135,206,235)
+  slate_blue = 0x6A5ACD,               // rgb(106,90,205)
+  slate_gray = 0x708090,               // rgb(112,128,144)
+  snow = 0xFFFAFA,                     // rgb(255,250,250)
+  spring_green = 0x00FF7F,             // rgb(0,255,127)
+  steel_blue = 0x4682B4,               // rgb(70,130,180)
+  tan = 0xD2B48C,                      // rgb(210,180,140)
+  teal = 0x008080,                     // rgb(0,128,128)
+  thistle = 0xD8BFD8,                  // rgb(216,191,216)
+  tomato = 0xFF6347,                   // rgb(255,99,71)
+  turquoise = 0x40E0D0,                // rgb(64,224,208)
+  violet = 0xEE82EE,                   // rgb(238,130,238)
+  wheat = 0xF5DEB3,                    // rgb(245,222,179)
+  white = 0xFFFFFF,                    // rgb(255,255,255)
+  white_smoke = 0xF5F5F5,              // rgb(245,245,245)
+  yellow = 0xFFFF00,                   // rgb(255,255,0)
+  yellow_green = 0x9ACD32              // rgb(154,205,50)
+};                                     // enum class color
+
+enum class terminal_color : uint8_t {
+  black = 30,
+  red,
+  green,
+  yellow,
+  blue,
+  magenta,
+  cyan,
+  white,
+  bright_black = 90,
+  bright_red,
+  bright_green,
+  bright_yellow,
+  bright_blue,
+  bright_magenta,
+  bright_cyan,
+  bright_white
+};
+
+enum class emphasis : uint8_t {
+  bold = 1,
+  faint = 1 << 1,
+  italic = 1 << 2,
+  underline = 1 << 3,
+  blink = 1 << 4,
+  reverse = 1 << 5,
+  conceal = 1 << 6,
+  strikethrough = 1 << 7,
+};
+
+// rgb is a struct for red, green and blue colors.
+// Using the name "rgb" makes some editors show the color in a tooltip.
+struct rgb {
+  FMT_CONSTEXPR rgb() : r(0), g(0), b(0) {}
+  FMT_CONSTEXPR rgb(uint8_t r_, uint8_t g_, uint8_t b_) : r(r_), g(g_), b(b_) {}
+  FMT_CONSTEXPR rgb(uint32_t hex)
+      : r((hex >> 16) & 0xFF), g((hex >> 8) & 0xFF), b(hex & 0xFF) {}
+  FMT_CONSTEXPR rgb(color hex)
+      : r((uint32_t(hex) >> 16) & 0xFF),
+        g((uint32_t(hex) >> 8) & 0xFF),
+        b(uint32_t(hex) & 0xFF) {}
+  uint8_t r;
+  uint8_t g;
+  uint8_t b;
+};
+
+namespace detail {
+
+// color is a struct of either a rgb color or a terminal color.
+struct color_type {
+  FMT_CONSTEXPR color_type() noexcept : is_rgb(), value{} {}
+  FMT_CONSTEXPR color_type(color rgb_color) noexcept : is_rgb(true), value{} {
+    value.rgb_color = static_cast<uint32_t>(rgb_color);
+  }
+  FMT_CONSTEXPR color_type(rgb rgb_color) noexcept : is_rgb(true), value{} {
+    value.rgb_color = (static_cast<uint32_t>(rgb_color.r) << 16) |
+                      (static_cast<uint32_t>(rgb_color.g) << 8) | rgb_color.b;
+  }
+  FMT_CONSTEXPR color_type(terminal_color term_color) noexcept
+      : is_rgb(), value{} {
+    value.term_color = static_cast<uint8_t>(term_color);
+  }
+  bool is_rgb;
+  union color_union {
+    uint8_t term_color;
+    uint32_t rgb_color;
+  } value;
+};
+}  // namespace detail
+
+/// A text style consisting of foreground and background colors and emphasis.
+class text_style {
+ public:
+  FMT_CONSTEXPR text_style(emphasis em = emphasis()) noexcept
+      : set_foreground_color(), set_background_color(), ems(em) {}
+
+  FMT_CONSTEXPR auto operator|=(const text_style& rhs) -> text_style& {
+    if (!set_foreground_color) {
+      set_foreground_color = rhs.set_foreground_color;
+      foreground_color = rhs.foreground_color;
+    } else if (rhs.set_foreground_color) {
+      if (!foreground_color.is_rgb || !rhs.foreground_color.is_rgb)
+        report_error("can't OR a terminal color");
+      foreground_color.value.rgb_color |= rhs.foreground_color.value.rgb_color;
+    }
+
+    if (!set_background_color) {
+      set_background_color = rhs.set_background_color;
+      background_color = rhs.background_color;
+    } else if (rhs.set_background_color) {
+      if (!background_color.is_rgb || !rhs.background_color.is_rgb)
+        report_error("can't OR a terminal color");
+      background_color.value.rgb_color |= rhs.background_color.value.rgb_color;
+    }
+
+    ems = static_cast<emphasis>(static_cast<uint8_t>(ems) |
+                                static_cast<uint8_t>(rhs.ems));
+    return *this;
+  }
+
+  friend FMT_CONSTEXPR auto operator|(text_style lhs, const text_style& rhs)
+      -> text_style {
+    return lhs |= rhs;
+  }
+
+  FMT_CONSTEXPR auto has_foreground() const noexcept -> bool {
+    return set_foreground_color;
+  }
+  FMT_CONSTEXPR auto has_background() const noexcept -> bool {
+    return set_background_color;
+  }
+  FMT_CONSTEXPR auto has_emphasis() const noexcept -> bool {
+    return static_cast<uint8_t>(ems) != 0;
+  }
+  FMT_CONSTEXPR auto get_foreground() const noexcept -> detail::color_type {
+    FMT_ASSERT(has_foreground(), "no foreground specified for this style");
+    return foreground_color;
+  }
+  FMT_CONSTEXPR auto get_background() const noexcept -> detail::color_type {
+    FMT_ASSERT(has_background(), "no background specified for this style");
+    return background_color;
+  }
+  FMT_CONSTEXPR auto get_emphasis() const noexcept -> emphasis {
+    FMT_ASSERT(has_emphasis(), "no emphasis specified for this style");
+    return ems;
+  }
+
+ private:
+  FMT_CONSTEXPR text_style(bool is_foreground,
+                           detail::color_type text_color) noexcept
+      : set_foreground_color(), set_background_color(), ems() {
+    if (is_foreground) {
+      foreground_color = text_color;
+      set_foreground_color = true;
+    } else {
+      background_color = text_color;
+      set_background_color = true;
+    }
+  }
+
+  friend FMT_CONSTEXPR auto fg(detail::color_type foreground) noexcept
+      -> text_style;
+
+  friend FMT_CONSTEXPR auto bg(detail::color_type background) noexcept
+      -> text_style;
+
+  detail::color_type foreground_color;
+  detail::color_type background_color;
+  bool set_foreground_color;
+  bool set_background_color;
+  emphasis ems;
+};
+
+/// Creates a text style from the foreground (text) color.
+FMT_CONSTEXPR inline auto fg(detail::color_type foreground) noexcept
+    -> text_style {
+  return text_style(true, foreground);
+}
+
+/// Creates a text style from the background color.
+FMT_CONSTEXPR inline auto bg(detail::color_type background) noexcept
+    -> text_style {
+  return text_style(false, background);
+}
+
+FMT_CONSTEXPR inline auto operator|(emphasis lhs, emphasis rhs) noexcept
+    -> text_style {
+  return text_style(lhs) | rhs;
+}
+
+namespace detail {
+
+template <typename Char> struct ansi_color_escape {
+  FMT_CONSTEXPR ansi_color_escape(color_type text_color,
+                                  const char* esc) noexcept {
+    // If we have a terminal color, we need to output another escape code
+    // sequence.
+    if (!text_color.is_rgb) {
+      bool is_background = esc == string_view("\x1b[48;2;");
+      uint32_t value = text_color.value.term_color;
+      // Background ASCII codes are the same as the foreground ones but with
+      // 10 more.
+      if (is_background) value += 10u;
+
+      size_t index = 0;
+      buffer[index++] = static_cast<Char>('\x1b');
+      buffer[index++] = static_cast<Char>('[');
+
+      if (value >= 100u) {
+        buffer[index++] = static_cast<Char>('1');
+        value %= 100u;
+      }
+      buffer[index++] = static_cast<Char>('0' + value / 10u);
+      buffer[index++] = static_cast<Char>('0' + value % 10u);
+
+      buffer[index++] = static_cast<Char>('m');
+      buffer[index++] = static_cast<Char>('\0');
+      return;
+    }
+
+    for (int i = 0; i < 7; i++) {
+      buffer[i] = static_cast<Char>(esc[i]);
+    }
+    rgb color(text_color.value.rgb_color);
+    to_esc(color.r, buffer + 7, ';');
+    to_esc(color.g, buffer + 11, ';');
+    to_esc(color.b, buffer + 15, 'm');
+    buffer[19] = static_cast<Char>(0);
+  }
+  FMT_CONSTEXPR ansi_color_escape(emphasis em) noexcept {
+    uint8_t em_codes[num_emphases] = {};
+    if (has_emphasis(em, emphasis::bold)) em_codes[0] = 1;
+    if (has_emphasis(em, emphasis::faint)) em_codes[1] = 2;
+    if (has_emphasis(em, emphasis::italic)) em_codes[2] = 3;
+    if (has_emphasis(em, emphasis::underline)) em_codes[3] = 4;
+    if (has_emphasis(em, emphasis::blink)) em_codes[4] = 5;
+    if (has_emphasis(em, emphasis::reverse)) em_codes[5] = 7;
+    if (has_emphasis(em, emphasis::conceal)) em_codes[6] = 8;
+    if (has_emphasis(em, emphasis::strikethrough)) em_codes[7] = 9;
+
+    size_t index = 0;
+    for (size_t i = 0; i < num_emphases; ++i) {
+      if (!em_codes[i]) continue;
+      buffer[index++] = static_cast<Char>('\x1b');
+      buffer[index++] = static_cast<Char>('[');
+      buffer[index++] = static_cast<Char>('0' + em_codes[i]);
+      buffer[index++] = static_cast<Char>('m');
+    }
+    buffer[index++] = static_cast<Char>(0);
+  }
+  FMT_CONSTEXPR operator const Char*() const noexcept { return buffer; }
+
+  FMT_CONSTEXPR auto begin() const noexcept -> const Char* { return buffer; }
+  FMT_CONSTEXPR20 auto end() const noexcept -> const Char* {
+    return buffer + basic_string_view<Char>(buffer).size();
+  }
+
+ private:
+  static constexpr size_t num_emphases = 8;
+  Char buffer[7u + 3u * num_emphases + 1u];
+
+  static FMT_CONSTEXPR void to_esc(uint8_t c, Char* out,
+                                   char delimiter) noexcept {
+    out[0] = static_cast<Char>('0' + c / 100);
+    out[1] = static_cast<Char>('0' + c / 10 % 10);
+    out[2] = static_cast<Char>('0' + c % 10);
+    out[3] = static_cast<Char>(delimiter);
+  }
+  static FMT_CONSTEXPR auto has_emphasis(emphasis em, emphasis mask) noexcept
+      -> bool {
+    return static_cast<uint8_t>(em) & static_cast<uint8_t>(mask);
+  }
+};
+
+template <typename Char>
+FMT_CONSTEXPR auto make_foreground_color(color_type foreground) noexcept
+    -> ansi_color_escape<Char> {
+  return ansi_color_escape<Char>(foreground, "\x1b[38;2;");
+}
+
+template <typename Char>
+FMT_CONSTEXPR auto make_background_color(color_type background) noexcept
+    -> ansi_color_escape<Char> {
+  return ansi_color_escape<Char>(background, "\x1b[48;2;");
+}
+
+template <typename Char>
+FMT_CONSTEXPR auto make_emphasis(emphasis em) noexcept
+    -> ansi_color_escape<Char> {
+  return ansi_color_escape<Char>(em);
+}
+
+template <typename Char> inline void reset_color(buffer<Char>& buffer) {
+  auto reset_color = string_view("\x1b[0m");
+  buffer.append(reset_color.begin(), reset_color.end());
+}
+
+template <typename T> struct styled_arg : view {
+  const T& value;
+  text_style style;
+  styled_arg(const T& v, text_style s) : value(v), style(s) {}
+};
+
+template <typename Char>
+void vformat_to(buffer<Char>& buf, const text_style& ts,
+                basic_string_view<Char> fmt,
+                basic_format_args<buffered_context<Char>> args) {
+  bool has_style = false;
+  if (ts.has_emphasis()) {
+    has_style = true;
+    auto emphasis = make_emphasis<Char>(ts.get_emphasis());
+    buf.append(emphasis.begin(), emphasis.end());
+  }
+  if (ts.has_foreground()) {
+    has_style = true;
+    auto foreground = make_foreground_color<Char>(ts.get_foreground());
+    buf.append(foreground.begin(), foreground.end());
+  }
+  if (ts.has_background()) {
+    has_style = true;
+    auto background = make_background_color<Char>(ts.get_background());
+    buf.append(background.begin(), background.end());
+  }
+  vformat_to(buf, fmt, args);
+  if (has_style) reset_color<Char>(buf);
+}
+}  // namespace detail
+
+inline void vprint(FILE* f, const text_style& ts, string_view fmt,
+                   format_args args) {
+  auto buf = memory_buffer();
+  detail::vformat_to(buf, ts, fmt, args);
+  print(f, FMT_STRING("{}"), string_view(buf.begin(), buf.size()));
+}
+
+/**
+ * Formats a string and prints it to the specified file stream using ANSI
+ * escape sequences to specify text formatting.
+ *
+ * **Example**:
+ *
+ *     fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
+ *                "Elapsed time: {0:.2f} seconds", 1.23);
+ */
+template <typename... T>
+void print(FILE* f, const text_style& ts, format_string<T...> fmt,
+           T&&... args) {
+  vprint(f, ts, fmt.str, vargs<T...>{{args...}});
+}
+
+/**
+ * Formats a string and prints it to stdout using ANSI escape sequences to
+ * specify text formatting.
+ *
+ * **Example**:
+ *
+ *     fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
+ *                "Elapsed time: {0:.2f} seconds", 1.23);
+ */
+template <typename... T>
+void print(const text_style& ts, format_string<T...> fmt, T&&... args) {
+  return print(stdout, ts, fmt, std::forward<T>(args)...);
+}
+
+inline auto vformat(const text_style& ts, string_view fmt, format_args args)
+    -> std::string {
+  auto buf = memory_buffer();
+  detail::vformat_to(buf, ts, fmt, args);
+  return fmt::to_string(buf);
+}
+
+/**
+ * Formats arguments and returns the result as a string using ANSI escape
+ * sequences to specify text formatting.
+ *
+ * **Example**:
+ *
+ * ```
+ * #include <fmt/color.h>
+ * std::string message = fmt::format(fmt::emphasis::bold | fg(fmt::color::red),
+ *                                   "The answer is {}", 42);
+ * ```
+ */
+template <typename... T>
+inline auto format(const text_style& ts, format_string<T...> fmt, T&&... args)
+    -> std::string {
+  return fmt::vformat(ts, fmt.str, vargs<T...>{{args...}});
+}
+
+/// Formats a string with the given text_style and writes the output to `out`.
+template <typename OutputIt,
+          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
+auto vformat_to(OutputIt out, const text_style& ts, string_view fmt,
+                format_args args) -> OutputIt {
+  auto&& buf = detail::get_buffer<char>(out);
+  detail::vformat_to(buf, ts, fmt, args);
+  return detail::get_iterator(buf, out);
+}
+
+/**
+ * Formats arguments with the given text style, writes the result to the output
+ * iterator `out` and returns the iterator past the end of the output range.
+ *
+ * **Example**:
+ *
+ *     std::vector<char> out;
+ *     fmt::format_to(std::back_inserter(out),
+ *                    fmt::emphasis::bold | fg(fmt::color::red), "{}", 42);
+ */
+template <typename OutputIt, typename... T,
+          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
+inline auto format_to(OutputIt out, const text_style& ts,
+                      format_string<T...> fmt, T&&... args) -> OutputIt {
+  return vformat_to(out, ts, fmt.str, vargs<T...>{{args...}});
+}
+
+template <typename T, typename Char>
+struct formatter<detail::styled_arg<T>, Char> : formatter<T, Char> {
+  template <typename FormatContext>
+  auto format(const detail::styled_arg<T>& arg, FormatContext& ctx) const
+      -> decltype(ctx.out()) {
+    const auto& ts = arg.style;
+    auto out = ctx.out();
+
+    bool has_style = false;
+    if (ts.has_emphasis()) {
+      has_style = true;
+      auto emphasis = detail::make_emphasis<Char>(ts.get_emphasis());
+      out = detail::copy<Char>(emphasis.begin(), emphasis.end(), out);
+    }
+    if (ts.has_foreground()) {
+      has_style = true;
+      auto foreground =
+          detail::make_foreground_color<Char>(ts.get_foreground());
+      out = detail::copy<Char>(foreground.begin(), foreground.end(), out);
+    }
+    if (ts.has_background()) {
+      has_style = true;
+      auto background =
+          detail::make_background_color<Char>(ts.get_background());
+      out = detail::copy<Char>(background.begin(), background.end(), out);
+    }
+    out = formatter<T, Char>::format(arg.value, ctx);
+    if (has_style) {
+      auto reset_color = string_view("\x1b[0m");
+      out = detail::copy<Char>(reset_color.begin(), reset_color.end(), out);
+    }
+    return out;
+  }
+};
+
+/**
+ * Returns an argument that will be formatted using ANSI escape sequences,
+ * to be used in a formatting function.
+ *
+ * **Example**:
+ *
+ *     fmt::print("Elapsed time: {0:.2f} seconds",
+ *                fmt::styled(1.23, fmt::fg(fmt::color::green) |
+ *                                  fmt::bg(fmt::color::blue)));
+ */
+template <typename T>
+FMT_CONSTEXPR auto styled(const T& value, text_style ts)
+    -> detail::styled_arg<remove_cvref_t<T>> {
+  return detail::styled_arg<remove_cvref_t<T>>{value, ts};
+}
+
+FMT_END_EXPORT
+FMT_END_NAMESPACE
+
+#endif  // FMT_COLOR_H_

include/spdlog/fmt/bundled/colors.h

@@ -1,257 +0,0 @@
-// Formatting library for C++ - the core API
-//
-// Copyright (c) 2012 - present, Victor Zverovich
-// All rights reserved.
-//
-// For the license information refer to format.h.
-//
-// Copyright (c) 2018 - present, Remotion (Igor Schulz)
-// All Rights Reserved
-// {fmt} support for rgb color output.
-
-#ifndef FMT_COLORS_H_
-#define FMT_COLORS_H_
-
-#include "format.h"
-
-FMT_BEGIN_NAMESPACE
-
-// rgb is a struct for red, green and blue colors.
-// We use rgb as name because some editors will show it as color direct in the
-// editor.
-struct rgb
-{
-    FMT_CONSTEXPR_DECL rgb()
-        : r(0)
-        , g(0)
-        , b(0)
-    {
-    }
-    FMT_CONSTEXPR_DECL rgb(uint8_t r_, uint8_t g_, uint8_t b_)
-        : r(r_)
-        , g(g_)
-        , b(b_)
-    {
-    }
-    FMT_CONSTEXPR_DECL rgb(uint32_t hex)
-        : r((hex >> 16) & 0xFF)
-        , g((hex >> 8) & 0xFF)
-        , b((hex)&0xFF)
-    {
-    }
-    uint8_t r;
-    uint8_t g;
-    uint8_t b;
-};
-
-namespace internal {
-
-FMT_CONSTEXPR inline void to_esc(uint8_t c, char out[], int offset)
-{
-    out[offset + 0] = static_cast<char>('0' + c / 100);
-    out[offset + 1] = static_cast<char>('0' + c / 10 % 10);
-    out[offset + 2] = static_cast<char>('0' + c % 10);
-}
-
-} // namespace internal
-
-FMT_FUNC void vprint_rgb(rgb fd, string_view format, format_args args)
-{
-    char escape_fd[] = "\x1b[38;2;000;000;000m";
-    static FMT_CONSTEXPR_DECL const char RESET_COLOR[] = "\x1b[0m";
-    internal::to_esc(fd.r, escape_fd, 7);
-    internal::to_esc(fd.g, escape_fd, 11);
-    internal::to_esc(fd.b, escape_fd, 15);
-
-    std::fputs(escape_fd, stdout);
-    vprint(format, args);
-    std::fputs(RESET_COLOR, stdout);
-}
-
-FMT_FUNC void vprint_rgb(rgb fd, rgb bg, string_view format, format_args args)
-{
-    char escape_fd[] = "\x1b[38;2;000;000;000m"; // foreground color
-    char escape_bg[] = "\x1b[48;2;000;000;000m"; // background color
-    static FMT_CONSTEXPR_DECL const char RESET_COLOR[] = "\x1b[0m";
-    internal::to_esc(fd.r, escape_fd, 7);
-    internal::to_esc(fd.g, escape_fd, 11);
-    internal::to_esc(fd.b, escape_fd, 15);
-
-    internal::to_esc(bg.r, escape_bg, 7);
-    internal::to_esc(bg.g, escape_bg, 11);
-    internal::to_esc(bg.b, escape_bg, 15);
-
-    std::fputs(escape_fd, stdout);
-    std::fputs(escape_bg, stdout);
-    vprint(format, args);
-    std::fputs(RESET_COLOR, stdout);
-}
-
-template<typename... Args>
-inline void print_rgb(rgb fd, string_view format_str, const Args &... args)
-{
-    vprint_rgb(fd, format_str, make_format_args(args...));
-}
-
-// rgb foreground color
-template<typename... Args>
-inline void print(rgb fd, string_view format_str, const Args &... args)
-{
-    vprint_rgb(fd, format_str, make_format_args(args...));
-}
-
-// rgb foreground color and background color
-template<typename... Args>
-inline void print(rgb fd, rgb bg, string_view format_str, const Args &... args)
-{
-    vprint_rgb(fd, bg, format_str, make_format_args(args...));
-}
-
-enum class color : uint32_t
-{
-    alice_blue = 0xF0F8FF,              // rgb(240,248,255)
-    antique_white = 0xFAEBD7,           // rgb(250,235,215)
-    aqua = 0x00FFFF,                    // rgb(0,255,255)
-    aquamarine = 0x7FFFD4,              // rgb(127,255,212)
-    azure = 0xF0FFFF,                   // rgb(240,255,255)
-    beige = 0xF5F5DC,                   // rgb(245,245,220)
-    bisque = 0xFFE4C4,                  // rgb(255,228,196)
-    black = 0x000000,                   // rgb(0,0,0)
-    blanched_almond = 0xFFEBCD,         // rgb(255,235,205)
-    blue = 0x0000FF,                    // rgb(0,0,255)
-    blue_violet = 0x8A2BE2,             // rgb(138,43,226)
-    brown = 0xA52A2A,                   // rgb(165,42,42)
-    burly_wood = 0xDEB887,              // rgb(222,184,135)
-    cadet_blue = 0x5F9EA0,              // rgb(95,158,160)
-    chartreuse = 0x7FFF00,              // rgb(127,255,0)
-    chocolate = 0xD2691E,               // rgb(210,105,30)
-    coral = 0xFF7F50,                   // rgb(255,127,80)
-    cornflower_blue = 0x6495ED,         // rgb(100,149,237)
-    cornsilk = 0xFFF8DC,                // rgb(255,248,220)
-    crimson = 0xDC143C,                 // rgb(220,20,60)
-    cyan = 0x00FFFF,                    // rgb(0,255,255)
-    dark_blue = 0x00008B,               // rgb(0,0,139)
-    dark_cyan = 0x008B8B,               // rgb(0,139,139)
-    dark_golden_rod = 0xB8860B,         // rgb(184,134,11)
-    dark_gray = 0xA9A9A9,               // rgb(169,169,169)
-    dark_green = 0x006400,              // rgb(0,100,0)
-    dark_khaki = 0xBDB76B,              // rgb(189,183,107)
-    dark_magenta = 0x8B008B,            // rgb(139,0,139)
-    dark_olive_green = 0x556B2F,        // rgb(85,107,47)
-    dark_orange = 0xFF8C00,             // rgb(255,140,0)
-    dark_orchid = 0x9932CC,             // rgb(153,50,204)
-    dark_red = 0x8B0000,                // rgb(139,0,0)
-    dark_salmon = 0xE9967A,             // rgb(233,150,122)
-    dark_sea_green = 0x8FBC8F,          // rgb(143,188,143)
-    dark_slate_blue = 0x483D8B,         // rgb(72,61,139)
-    dark_slate_gray = 0x2F4F4F,         // rgb(47,79,79)
-    dark_turquoise = 0x00CED1,          // rgb(0,206,209)
-    dark_violet = 0x9400D3,             // rgb(148,0,211)
-    deep_pink = 0xFF1493,               // rgb(255,20,147)
-    deep_sky_blue = 0x00BFFF,           // rgb(0,191,255)
-    dim_gray = 0x696969,                // rgb(105,105,105)
-    dodger_blue = 0x1E90FF,             // rgb(30,144,255)
-    fire_brick = 0xB22222,              // rgb(178,34,34)
-    floral_white = 0xFFFAF0,            // rgb(255,250,240)
-    forest_green = 0x228B22,            // rgb(34,139,34)
-    fuchsia = 0xFF00FF,                 // rgb(255,0,255)
-    gainsboro = 0xDCDCDC,               // rgb(220,220,220)
-    ghost_white = 0xF8F8FF,             // rgb(248,248,255)
-    gold = 0xFFD700,                    // rgb(255,215,0)
-    golden_rod = 0xDAA520,              // rgb(218,165,32)
-    gray = 0x808080,                    // rgb(128,128,128)
-    green = 0x008000,                   // rgb(0,128,0)
-    green_yellow = 0xADFF2F,            // rgb(173,255,47)
-    honey_dew = 0xF0FFF0,               // rgb(240,255,240)
-    hot_pink = 0xFF69B4,                // rgb(255,105,180)
-    indian_red = 0xCD5C5C,              // rgb(205,92,92)
-    indigo = 0x4B0082,                  // rgb(75,0,130)
-    ivory = 0xFFFFF0,                   // rgb(255,255,240)
-    khaki = 0xF0E68C,                   // rgb(240,230,140)
-    lavender = 0xE6E6FA,                // rgb(230,230,250)
-    lavender_blush = 0xFFF0F5,          // rgb(255,240,245)
-    lawn_green = 0x7CFC00,              // rgb(124,252,0)
-    lemon_chiffon = 0xFFFACD,           // rgb(255,250,205)
-    light_blue = 0xADD8E6,              // rgb(173,216,230)
-    light_coral = 0xF08080,             // rgb(240,128,128)
-    light_cyan = 0xE0FFFF,              // rgb(224,255,255)
-    light_golden_rod_yellow = 0xFAFAD2, // rgb(250,250,210)
-    light_gray = 0xD3D3D3,              // rgb(211,211,211)
-    light_green = 0x90EE90,             // rgb(144,238,144)
-    light_pink = 0xFFB6C1,              // rgb(255,182,193)
-    light_salmon = 0xFFA07A,            // rgb(255,160,122)
-    light_sea_green = 0x20B2AA,         // rgb(32,178,170)
-    light_sky_blue = 0x87CEFA,          // rgb(135,206,250)
-    light_slate_gray = 0x778899,        // rgb(119,136,153)
-    light_steel_blue = 0xB0C4DE,        // rgb(176,196,222)
-    light_yellow = 0xFFFFE0,            // rgb(255,255,224)
-    lime = 0x00FF00,                    // rgb(0,255,0)
-    lime_green = 0x32CD32,              // rgb(50,205,50)
-    linen = 0xFAF0E6,                   // rgb(250,240,230)
-    magenta = 0xFF00FF,                 // rgb(255,0,255)
-    maroon = 0x800000,                  // rgb(128,0,0)
-    medium_aqua_marine = 0x66CDAA,      // rgb(102,205,170)
-    medium_blue = 0x0000CD,             // rgb(0,0,205)
-    medium_orchid = 0xBA55D3,           // rgb(186,85,211)
-    medium_purple = 0x9370DB,           // rgb(147,112,219)
-    medium_sea_green = 0x3CB371,        // rgb(60,179,113)
-    medium_slate_blue = 0x7B68EE,       // rgb(123,104,238)
-    medium_spring_green = 0x00FA9A,     // rgb(0,250,154)
-    medium_turquoise = 0x48D1CC,        // rgb(72,209,204)
-    medium_violet_red = 0xC71585,       // rgb(199,21,133)
-    midnight_blue = 0x191970,           // rgb(25,25,112)
-    mint_cream = 0xF5FFFA,              // rgb(245,255,250)
-    misty_rose = 0xFFE4E1,              // rgb(255,228,225)
-    moccasin = 0xFFE4B5,                // rgb(255,228,181)
-    navajo_white = 0xFFDEAD,            // rgb(255,222,173)
-    navy = 0x000080,                    // rgb(0,0,128)
-    old_lace = 0xFDF5E6,                // rgb(253,245,230)
-    olive = 0x808000,                   // rgb(128,128,0)
-    olive_drab = 0x6B8E23,              // rgb(107,142,35)
-    orange = 0xFFA500,                  // rgb(255,165,0)
-    orange_red = 0xFF4500,              // rgb(255,69,0)
-    orchid = 0xDA70D6,                  // rgb(218,112,214)
-    pale_golden_rod = 0xEEE8AA,         // rgb(238,232,170)
-    pale_green = 0x98FB98,              // rgb(152,251,152)
-    pale_turquoise = 0xAFEEEE,          // rgb(175,238,238)
-    pale_violet_red = 0xDB7093,         // rgb(219,112,147)
-    papaya_whip = 0xFFEFD5,             // rgb(255,239,213)
-    peach_puff = 0xFFDAB9,              // rgb(255,218,185)
-    peru = 0xCD853F,                    // rgb(205,133,63)
-    pink = 0xFFC0CB,                    // rgb(255,192,203)
-    plum = 0xDDA0DD,                    // rgb(221,160,221)
-    powder_blue = 0xB0E0E6,             // rgb(176,224,230)
-    purple = 0x800080,                  // rgb(128,0,128)
-    rebecca_purple = 0x663399,          // rgb(102,51,153)
-    red = 0xFF0000,                     // rgb(255,0,0)
-    rosy_brown = 0xBC8F8F,              // rgb(188,143,143)
-    royal_blue = 0x4169E1,              // rgb(65,105,225)
-    saddle_brown = 0x8B4513,            // rgb(139,69,19)
-    salmon = 0xFA8072,                  // rgb(250,128,114)
-    sandy_brown = 0xF4A460,             // rgb(244,164,96)
-    sea_green = 0x2E8B57,               // rgb(46,139,87)
-    sea_shell = 0xFFF5EE,               // rgb(255,245,238)
-    sienna = 0xA0522D,                  // rgb(160,82,45)
-    silver = 0xC0C0C0,                  // rgb(192,192,192)
-    sky_blue = 0x87CEEB,                // rgb(135,206,235)
-    slate_blue = 0x6A5ACD,              // rgb(106,90,205)
-    slate_gray = 0x708090,              // rgb(112,128,144)
-    snow = 0xFFFAFA,                    // rgb(255,250,250)
-    spring_green = 0x00FF7F,            // rgb(0,255,127)
-    steel_blue = 0x4682B4,              // rgb(70,130,180)
-    tan = 0xD2B48C,                     // rgb(210,180,140)
-    teal = 0x008080,                    // rgb(0,128,128)
-    thistle = 0xD8BFD8,                 // rgb(216,191,216)
-    tomato = 0xFF6347,                  // rgb(255,99,71)
-    turquoise = 0x40E0D0,               // rgb(64,224,208)
-    violet = 0xEE82EE,                  // rgb(238,130,238)
-    wheat = 0xF5DEB3,                   // rgb(245,222,179)
-    white = 0xFFFFFF,                   // rgb(255,255,255)
-    white_smoke = 0xF5F5F5,             // rgb(245,245,245)
-    yellow = 0xFFFF00,                  // rgb(255,255,0)
-    yellow_green = 0x9ACD32,            // rgb(154,205,50)
-};                                      // enum class colors
-
-FMT_END_NAMESPACE
-
-#endif // FMT_COLORS_H_

include/spdlog/fmt/bundled/compile.h

@@ -0,0 +1,539 @@
+// Formatting library for C++ - experimental format string compilation
+//
+// Copyright (c) 2012 - present, Victor Zverovich and fmt contributors
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_COMPILE_H_
+#define FMT_COMPILE_H_
+
+#ifndef FMT_MODULE
+#  include <iterator>  // std::back_inserter
+#endif
+
+#include "format.h"
+
+FMT_BEGIN_NAMESPACE
+
+// A compile-time string which is compiled into fast formatting code.
+FMT_EXPORT class compiled_string {};
+
+template <typename S>
+struct is_compiled_string : std::is_base_of<compiled_string, S> {};
+
+namespace detail {
+
+/**
+ * Converts a string literal `s` into a format string that will be parsed at
+ * compile time and converted into efficient formatting code. Requires C++17
+ * `constexpr if` compiler support.
+ *
+ * **Example**:
+ *
+ *     // Converts 42 into std::string using the most efficient method and no
+ *     // runtime format string processing.
+ *     std::string s = fmt::format(FMT_COMPILE("{}"), 42);
+ */
+#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
+#  define FMT_COMPILE(s) FMT_STRING_IMPL(s, fmt::compiled_string)
+#else
+#  define FMT_COMPILE(s) FMT_STRING(s)
+#endif
+
+template <typename T, typename... Tail>
+auto first(const T& value, const Tail&...) -> const T& {
+  return value;
+}
+
+#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
+template <typename... Args> struct type_list {};
+
+// Returns a reference to the argument at index N from [first, rest...].
+template <int N, typename T, typename... Args>
+constexpr const auto& get([[maybe_unused]] const T& first,
+                          [[maybe_unused]] const Args&... rest) {
+  static_assert(N < 1 + sizeof...(Args), "index is out of bounds");
+  if constexpr (N == 0)
+    return first;
+  else
+    return detail::get<N - 1>(rest...);
+}
+
+#  if FMT_USE_NONTYPE_TEMPLATE_ARGS
+template <int N, typename T, typename... Args, typename Char>
+constexpr auto get_arg_index_by_name(basic_string_view<Char> name) -> int {
+  if constexpr (is_static_named_arg<T>()) {
+    if (name == T::name) return N;
+  }
+  if constexpr (sizeof...(Args) > 0)
+    return get_arg_index_by_name<N + 1, Args...>(name);
+  (void)name;  // Workaround an MSVC bug about "unused" parameter.
+  return -1;
+}
+#  endif
+
+template <typename... Args, typename Char>
+FMT_CONSTEXPR auto get_arg_index_by_name(basic_string_view<Char> name) -> int {
+#  if FMT_USE_NONTYPE_TEMPLATE_ARGS
+  if constexpr (sizeof...(Args) > 0)
+    return get_arg_index_by_name<0, Args...>(name);
+#  endif
+  (void)name;
+  return -1;
+}
+
+template <typename Char, typename... Args>
+constexpr int get_arg_index_by_name(basic_string_view<Char> name,
+                                    type_list<Args...>) {
+  return get_arg_index_by_name<Args...>(name);
+}
+
+template <int N, typename> struct get_type_impl;
+
+template <int N, typename... Args> struct get_type_impl<N, type_list<Args...>> {
+  using type =
+      remove_cvref_t<decltype(detail::get<N>(std::declval<Args>()...))>;
+};
+
+template <int N, typename T>
+using get_type = typename get_type_impl<N, T>::type;
+
+template <typename T> struct is_compiled_format : std::false_type {};
+
+template <typename Char> struct text {
+  basic_string_view<Char> data;
+  using char_type = Char;
+
+  template <typename OutputIt, typename... Args>
+  constexpr OutputIt format(OutputIt out, const Args&...) const {
+    return write<Char>(out, data);
+  }
+};
+
+template <typename Char>
+struct is_compiled_format<text<Char>> : std::true_type {};
+
+template <typename Char>
+constexpr text<Char> make_text(basic_string_view<Char> s, size_t pos,
+                               size_t size) {
+  return {{&s[pos], size}};
+}
+
+template <typename Char> struct code_unit {
+  Char value;
+  using char_type = Char;
+
+  template <typename OutputIt, typename... Args>
+  constexpr OutputIt format(OutputIt out, const Args&...) const {
+    *out++ = value;
+    return out;
+  }
+};
+
+// This ensures that the argument type is convertible to `const T&`.
+template <typename T, int N, typename... Args>
+constexpr const T& get_arg_checked(const Args&... args) {
+  const auto& arg = detail::get<N>(args...);
+  if constexpr (detail::is_named_arg<remove_cvref_t<decltype(arg)>>()) {
+    return arg.value;
+  } else {
+    return arg;
+  }
+}
+
+template <typename Char>
+struct is_compiled_format<code_unit<Char>> : std::true_type {};
+
+// A replacement field that refers to argument N.
+template <typename Char, typename T, int N> struct field {
+  using char_type = Char;
+
+  template <typename OutputIt, typename... Args>
+  constexpr OutputIt format(OutputIt out, const Args&... args) const {
+    const T& arg = get_arg_checked<T, N>(args...);
+    if constexpr (std::is_convertible<T, basic_string_view<Char>>::value) {
+      auto s = basic_string_view<Char>(arg);
+      return copy<Char>(s.begin(), s.end(), out);
+    } else {
+      return write<Char>(out, arg);
+    }
+  }
+};
+
+template <typename Char, typename T, int N>
+struct is_compiled_format<field<Char, T, N>> : std::true_type {};
+
+// A replacement field that refers to argument with name.
+template <typename Char> struct runtime_named_field {
+  using char_type = Char;
+  basic_string_view<Char> name;
+
+  template <typename OutputIt, typename T>
+  constexpr static bool try_format_argument(
+      OutputIt& out,
+      // [[maybe_unused]] due to unused-but-set-parameter warning in GCC 7,8,9
+      [[maybe_unused]] basic_string_view<Char> arg_name, const T& arg) {
+    if constexpr (is_named_arg<typename std::remove_cv<T>::type>::value) {
+      if (arg_name == arg.name) {
+        out = write<Char>(out, arg.value);
+        return true;
+      }
+    }
+    return false;
+  }
+
+  template <typename OutputIt, typename... Args>
+  constexpr OutputIt format(OutputIt out, const Args&... args) const {
+    bool found = (try_format_argument(out, name, args) || ...);
+    if (!found) {
+      FMT_THROW(format_error("argument with specified name is not found"));
+    }
+    return out;
+  }
+};
+
+template <typename Char>
+struct is_compiled_format<runtime_named_field<Char>> : std::true_type {};
+
+// A replacement field that refers to argument N and has format specifiers.
+template <typename Char, typename T, int N> struct spec_field {
+  using char_type = Char;
+  formatter<T, Char> fmt;
+
+  template <typename OutputIt, typename... Args>
+  constexpr FMT_INLINE OutputIt format(OutputIt out,
+                                       const Args&... args) const {
+    const auto& vargs =
+        fmt::make_format_args<basic_format_context<OutputIt, Char>>(args...);
+    basic_format_context<OutputIt, Char> ctx(out, vargs);
+    return fmt.format(get_arg_checked<T, N>(args...), ctx);
+  }
+};
+
+template <typename Char, typename T, int N>
+struct is_compiled_format<spec_field<Char, T, N>> : std::true_type {};
+
+template <typename L, typename R> struct concat {
+  L lhs;
+  R rhs;
+  using char_type = typename L::char_type;
+
+  template <typename OutputIt, typename... Args>
+  constexpr OutputIt format(OutputIt out, const Args&... args) const {
+    out = lhs.format(out, args...);
+    return rhs.format(out, args...);
+  }
+};
+
+template <typename L, typename R>
+struct is_compiled_format<concat<L, R>> : std::true_type {};
+
+template <typename L, typename R>
+constexpr concat<L, R> make_concat(L lhs, R rhs) {
+  return {lhs, rhs};
+}
+
+struct unknown_format {};
+
+template <typename Char>
+constexpr size_t parse_text(basic_string_view<Char> str, size_t pos) {
+  for (size_t size = str.size(); pos != size; ++pos) {
+    if (str[pos] == '{' || str[pos] == '}') break;
+  }
+  return pos;
+}
+
+template <typename Args, size_t POS, int ID, typename S>
+constexpr auto compile_format_string(S fmt);
+
+template <typename Args, size_t POS, int ID, typename T, typename S>
+constexpr auto parse_tail(T head, S fmt) {
+  if constexpr (POS != basic_string_view<typename S::char_type>(fmt).size()) {
+    constexpr auto tail = compile_format_string<Args, POS, ID>(fmt);
+    if constexpr (std::is_same<remove_cvref_t<decltype(tail)>,
+                               unknown_format>())
+      return tail;
+    else
+      return make_concat(head, tail);
+  } else {
+    return head;
+  }
+}
+
+template <typename T, typename Char> struct parse_specs_result {
+  formatter<T, Char> fmt;
+  size_t end;
+  int next_arg_id;
+};
+
+enum { manual_indexing_id = -1 };
+
+template <typename T, typename Char>
+constexpr parse_specs_result<T, Char> parse_specs(basic_string_view<Char> str,
+                                                  size_t pos, int next_arg_id) {
+  str.remove_prefix(pos);
+  auto ctx =
+      compile_parse_context<Char>(str, max_value<int>(), nullptr, next_arg_id);
+  auto f = formatter<T, Char>();
+  auto end = f.parse(ctx);
+  return {f, pos + fmt::detail::to_unsigned(end - str.data()),
+          next_arg_id == 0 ? manual_indexing_id : ctx.next_arg_id()};
+}
+
+template <typename Char> struct arg_id_handler {
+  arg_id_kind kind;
+  arg_ref<Char> arg_id;
+
+  constexpr int on_auto() {
+    FMT_ASSERT(false, "handler cannot be used with automatic indexing");
+    return 0;
+  }
+  constexpr int on_index(int id) {
+    kind = arg_id_kind::index;
+    arg_id = arg_ref<Char>(id);
+    return 0;
+  }
+  constexpr int on_name(basic_string_view<Char> id) {
+    kind = arg_id_kind::name;
+    arg_id = arg_ref<Char>(id);
+    return 0;
+  }
+};
+
+template <typename Char> struct parse_arg_id_result {
+  arg_id_kind kind;
+  arg_ref<Char> arg_id;
+  const Char* arg_id_end;
+};
+
+template <int ID, typename Char>
+constexpr auto parse_arg_id(const Char* begin, const Char* end) {
+  auto handler = arg_id_handler<Char>{arg_id_kind::none, arg_ref<Char>{}};
+  auto arg_id_end = parse_arg_id(begin, end, handler);
+  return parse_arg_id_result<Char>{handler.kind, handler.arg_id, arg_id_end};
+}
+
+template <typename T, typename Enable = void> struct field_type {
+  using type = remove_cvref_t<T>;
+};
+
+template <typename T>
+struct field_type<T, enable_if_t<detail::is_named_arg<T>::value>> {
+  using type = remove_cvref_t<decltype(T::value)>;
+};
+
+template <typename T, typename Args, size_t END_POS, int ARG_INDEX, int NEXT_ID,
+          typename S>
+constexpr auto parse_replacement_field_then_tail(S fmt) {
+  using char_type = typename S::char_type;
+  constexpr auto str = basic_string_view<char_type>(fmt);
+  constexpr char_type c = END_POS != str.size() ? str[END_POS] : char_type();
+  if constexpr (c == '}') {
+    return parse_tail<Args, END_POS + 1, NEXT_ID>(
+        field<char_type, typename field_type<T>::type, ARG_INDEX>(), fmt);
+  } else if constexpr (c != ':') {
+    FMT_THROW(format_error("expected ':'"));
+  } else {
+    constexpr auto result = parse_specs<typename field_type<T>::type>(
+        str, END_POS + 1, NEXT_ID == manual_indexing_id ? 0 : NEXT_ID);
+    if constexpr (result.end >= str.size() || str[result.end] != '}') {
+      FMT_THROW(format_error("expected '}'"));
+      return 0;
+    } else {
+      return parse_tail<Args, result.end + 1, result.next_arg_id>(
+          spec_field<char_type, typename field_type<T>::type, ARG_INDEX>{
+              result.fmt},
+          fmt);
+    }
+  }
+}
+
+// Compiles a non-empty format string and returns the compiled representation
+// or unknown_format() on unrecognized input.
+template <typename Args, size_t POS, int ID, typename S>
+constexpr auto compile_format_string(S fmt) {
+  using char_type = typename S::char_type;
+  constexpr auto str = basic_string_view<char_type>(fmt);
+  if constexpr (str[POS] == '{') {
+    if constexpr (POS + 1 == str.size())
+      FMT_THROW(format_error("unmatched '{' in format string"));
+    if constexpr (str[POS + 1] == '{') {
+      return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), fmt);
+    } else if constexpr (str[POS + 1] == '}' || str[POS + 1] == ':') {
+      static_assert(ID != manual_indexing_id,
+                    "cannot switch from manual to automatic argument indexing");
+      constexpr auto next_id =
+          ID != manual_indexing_id ? ID + 1 : manual_indexing_id;
+      return parse_replacement_field_then_tail<get_type<ID, Args>, Args,
+                                               POS + 1, ID, next_id>(fmt);
+    } else {
+      constexpr auto arg_id_result =
+          parse_arg_id<ID>(str.data() + POS + 1, str.data() + str.size());
+      constexpr auto arg_id_end_pos = arg_id_result.arg_id_end - str.data();
+      constexpr char_type c =
+          arg_id_end_pos != str.size() ? str[arg_id_end_pos] : char_type();
+      static_assert(c == '}' || c == ':', "missing '}' in format string");
+      if constexpr (arg_id_result.kind == arg_id_kind::index) {
+        static_assert(
+            ID == manual_indexing_id || ID == 0,
+            "cannot switch from automatic to manual argument indexing");
+        constexpr auto arg_index = arg_id_result.arg_id.index;
+        return parse_replacement_field_then_tail<get_type<arg_index, Args>,
+                                                 Args, arg_id_end_pos,
+                                                 arg_index, manual_indexing_id>(
+            fmt);
+      } else if constexpr (arg_id_result.kind == arg_id_kind::name) {
+        constexpr auto arg_index =
+            get_arg_index_by_name(arg_id_result.arg_id.name, Args{});
+        if constexpr (arg_index >= 0) {
+          constexpr auto next_id =
+              ID != manual_indexing_id ? ID + 1 : manual_indexing_id;
+          return parse_replacement_field_then_tail<
+              decltype(get_type<arg_index, Args>::value), Args, arg_id_end_pos,
+              arg_index, next_id>(fmt);
+        } else if constexpr (c == '}') {
+          return parse_tail<Args, arg_id_end_pos + 1, ID>(
+              runtime_named_field<char_type>{arg_id_result.arg_id.name}, fmt);
+        } else if constexpr (c == ':') {
+          return unknown_format();  // no type info for specs parsing
+        }
+      }
+    }
+  } else if constexpr (str[POS] == '}') {
+    if constexpr (POS + 1 == str.size())
+      FMT_THROW(format_error("unmatched '}' in format string"));
+    return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), fmt);
+  } else {
+    constexpr auto end = parse_text(str, POS + 1);
+    if constexpr (end - POS > 1) {
+      return parse_tail<Args, end, ID>(make_text(str, POS, end - POS), fmt);
+    } else {
+      return parse_tail<Args, end, ID>(code_unit<char_type>{str[POS]}, fmt);
+    }
+  }
+}
+
+template <typename... Args, typename S,
+          FMT_ENABLE_IF(is_compiled_string<S>::value)>
+constexpr auto compile(S fmt) {
+  constexpr auto str = basic_string_view<typename S::char_type>(fmt);
+  if constexpr (str.size() == 0) {
+    return detail::make_text(str, 0, 0);
+  } else {
+    constexpr auto result =
+        detail::compile_format_string<detail::type_list<Args...>, 0, 0>(fmt);
+    return result;
+  }
+}
+#endif  // defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
+}  // namespace detail
+
+FMT_BEGIN_EXPORT
+
+#if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
+
+template <typename CompiledFormat, typename... Args,
+          typename Char = typename CompiledFormat::char_type,
+          FMT_ENABLE_IF(detail::is_compiled_format<CompiledFormat>::value)>
+FMT_INLINE std::basic_string<Char> format(const CompiledFormat& cf,
+                                          const Args&... args) {
+  auto s = std::basic_string<Char>();
+  cf.format(std::back_inserter(s), args...);
+  return s;
+}
+
+template <typename OutputIt, typename CompiledFormat, typename... Args,
+          FMT_ENABLE_IF(detail::is_compiled_format<CompiledFormat>::value)>
+constexpr FMT_INLINE OutputIt format_to(OutputIt out, const CompiledFormat& cf,
+                                        const Args&... args) {
+  return cf.format(out, args...);
+}
+
+template <typename S, typename... Args,
+          FMT_ENABLE_IF(is_compiled_string<S>::value)>
+FMT_INLINE std::basic_string<typename S::char_type> format(const S&,
+                                                           Args&&... args) {
+  if constexpr (std::is_same<typename S::char_type, char>::value) {
+    constexpr auto str = basic_string_view<typename S::char_type>(S());
+    if constexpr (str.size() == 2 && str[0] == '{' && str[1] == '}') {
+      const auto& first = detail::first(args...);
+      if constexpr (detail::is_named_arg<
+                        remove_cvref_t<decltype(first)>>::value) {
+        return fmt::to_string(first.value);
+      } else {
+        return fmt::to_string(first);
+      }
+    }
+  }
+  constexpr auto compiled = detail::compile<Args...>(S());
+  if constexpr (std::is_same<remove_cvref_t<decltype(compiled)>,
+                             detail::unknown_format>()) {
+    return fmt::format(
+        static_cast<basic_string_view<typename S::char_type>>(S()),
+        std::forward<Args>(args)...);
+  } else {
+    return fmt::format(compiled, std::forward<Args>(args)...);
+  }
+}
+
+template <typename OutputIt, typename S, typename... Args,
+          FMT_ENABLE_IF(is_compiled_string<S>::value)>
+FMT_CONSTEXPR OutputIt format_to(OutputIt out, const S&, Args&&... args) {
+  constexpr auto compiled = detail::compile<Args...>(S());
+  if constexpr (std::is_same<remove_cvref_t<decltype(compiled)>,
+                             detail::unknown_format>()) {
+    return fmt::format_to(
+        out, static_cast<basic_string_view<typename S::char_type>>(S()),
+        std::forward<Args>(args)...);
+  } else {
+    return fmt::format_to(out, compiled, std::forward<Args>(args)...);
+  }
+}
+#endif
+
+template <typename OutputIt, typename S, typename... Args,
+          FMT_ENABLE_IF(is_compiled_string<S>::value)>
+auto format_to_n(OutputIt out, size_t n, const S& fmt, Args&&... args)
+    -> format_to_n_result<OutputIt> {
+  using traits = detail::fixed_buffer_traits;
+  auto buf = detail::iterator_buffer<OutputIt, char, traits>(out, n);
+  fmt::format_to(std::back_inserter(buf), fmt, std::forward<Args>(args)...);
+  return {buf.out(), buf.count()};
+}
+
+template <typename S, typename... Args,
+          FMT_ENABLE_IF(is_compiled_string<S>::value)>
+FMT_CONSTEXPR20 auto formatted_size(const S& fmt, const Args&... args)
+    -> size_t {
+  auto buf = detail::counting_buffer<>();
+  fmt::format_to(appender(buf), fmt, args...);
+  return buf.count();
+}
+
+template <typename S, typename... Args,
+          FMT_ENABLE_IF(is_compiled_string<S>::value)>
+void print(std::FILE* f, const S& fmt, const Args&... args) {
+  auto buf = memory_buffer();
+  fmt::format_to(appender(buf), fmt, args...);
+  detail::print(f, {buf.data(), buf.size()});
+}
+
+template <typename S, typename... Args,
+          FMT_ENABLE_IF(is_compiled_string<S>::value)>
+void print(const S& fmt, const Args&... args) {
+  print(stdout, fmt, args...);
+}
+
+#if FMT_USE_NONTYPE_TEMPLATE_ARGS
+inline namespace literals {
+template <detail::fixed_string Str> constexpr auto operator""_cf() {
+  return FMT_COMPILE(Str.data);
+}
+}  // namespace literals
+#endif
+
+FMT_END_EXPORT
+FMT_END_NAMESPACE
+
+#endif  // FMT_COMPILE_H_

include/spdlog/fmt/bundled/fmt.license.rst

@@ -0,0 +1,27 @@
+Copyright (c) 2012 - present, Victor Zverovich
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+--- Optional exception to the license ---
+
+As an exception, if, as a result of your compiling your source code, portions
+of this Software are embedded into a machine-executable object form of such
+source code, you may redistribute such embedded portions in such object form
+without including the above copyright and permission notices.