Update rotating_file_sink.h

include/spdlog/sinks/rotating_file_sink.h

@@ -22,8 +22,8 @@ template<typename Mutex>
 class rotating_file_sink final : public base_sink<Mutex>
 {
 public:
-    rotating_file_sink(filename_t base_filename, std::size_t max_size, std::size_t max_files, bool rotate_on_open = false,
-        const file_event_handlers &event_handlers = {});
+    rotating_file_sink(filename_t base_filename, std::size_t max_size, std::size_t max_files, rotate_file_mode rmode = rotate_file_mode::desc, 
+    bool rotate_on_open = false, const file_event_handlers &event_handlers = {});
     static filename_t calc_filename(const filename_t &filename, std::size_t index);
     filename_t filename();
 
@@ -32,12 +32,21 @@ protected:
     void flush_() override;
 
 private:
+    void rotate_();
+    
+    // Rotate files:
+    // log.1.txt -> delete
+    // log.2.txt -> log.1.txt
+    // log.3.txt -> log.2.txt
+    // log.txt -> log.3.txt
+    void rotate_asc_();
+
     // Rotate files:
     // log.txt -> log.1.txt
     // log.1.txt -> log.2.txt
     // log.2.txt -> log.3.txt
     // log.3.txt -> delete
-    void rotate_();
+    void rotate_desc_();
 
     // delete the target if exists, and rename the src file  to target
     // return true on success, false otherwise.
@@ -48,6 +57,7 @@ private:
     std::size_t max_files_;
     std::size_t current_size_;
     details::file_helper file_helper_;
+    spdlog::rotate_file_mode rotate_mode_;
 };
 
 using rotating_file_sink_mt = rotating_file_sink<std::mutex>;
@@ -61,18 +71,18 @@ using rotating_file_sink_st = rotating_file_sink<details::null_mutex>;
 
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> rotating_logger_mt(const std::string &logger_name, const filename_t &filename, size_t max_file_size,
-    size_t max_files, bool rotate_on_open = false, const file_event_handlers &event_handlers = {})
+    size_t max_files, rotate_file_mode rmode = rotate_file_mode::desc, bool rotate_on_open = false, const file_event_handlers &event_handlers = {})
 {
     return Factory::template create<sinks::rotating_file_sink_mt>(
-        logger_name, filename, max_file_size, max_files, rotate_on_open, event_handlers);
+        logger_name, filename, max_file_size, max_files, rmode, rotate_on_open, event_handlers);
 }
 
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> rotating_logger_st(const std::string &logger_name, const filename_t &filename, size_t max_file_size,
-    size_t max_files, bool rotate_on_open = false, const file_event_handlers &event_handlers = {})
+    size_t max_files, rotate_file_mode rmode = rotate_file_mode::desc, bool rotate_on_open = false, const file_event_handlers &event_handlers = {})
 {
     return Factory::template create<sinks::rotating_file_sink_st>(
-        logger_name, filename, max_file_size, max_files, rotate_on_open, event_handlers);
+        logger_name, filename, max_file_size, max_files, rmode, rotate_on_open, event_handlers);
 }
 } // namespace spdlog