1. renamed lib to to spitlog

2. Rotating bugfix

include/spitlog/formatter.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "details/log_msg.h"
+namespace spitlog
+{
+namespace details {
+class flag_formatter;
+}
+
+class formatter
+{
+public:
+    virtual ~formatter() {}
+    virtual void format(details::log_msg& msg) = 0;
+};
+
+class pattern_formatter : public formatter
+{
+
+public:
+    explicit pattern_formatter(const std::string& pattern);
+    pattern_formatter(const pattern_formatter&) = delete;
+    void format(details::log_msg& msg) override;
+private:
+    const std::string _pattern;
+    std::vector<std::unique_ptr<details::flag_formatter>> _formatters;
+    void handle_flag(char flag);
+    void compile_pattern(const std::string& pattern);
+};
+}
+
+#include "./details/pattern_formatter_impl.h"
+