Added the ability to truncate the basic file logger.

Added the ability to truncate the basic file logger.

include/spdlog/details/spdlog_impl.h

@@ -36,14 +36,14 @@ inline void spdlog::drop(const std::string &name)
 }
 
 // Create multi/single threaded simple file logger
-inline std::shared_ptr<spdlog::logger> spdlog::basic_logger_mt(const std::string& logger_name, const filename_t& filename, bool force_flush)
+inline std::shared_ptr<spdlog::logger> spdlog::basic_logger_mt(const std::string& logger_name, const filename_t& filename, bool force_flush, bool truncate)
 {
-    return create<spdlog::sinks::simple_file_sink_mt>(logger_name, filename, force_flush);
+    return create<spdlog::sinks::simple_file_sink_mt>(logger_name, filename, force_flush, truncate);
 }
 
-inline std::shared_ptr<spdlog::logger> spdlog::basic_logger_st(const std::string& logger_name, const filename_t& filename, bool force_flush)
+inline std::shared_ptr<spdlog::logger> spdlog::basic_logger_st(const std::string& logger_name, const filename_t& filename, bool force_flush, bool truncate)
 {
-    return create<spdlog::sinks::simple_file_sink_st>(logger_name, filename, force_flush);
+    return create<spdlog::sinks::simple_file_sink_st>(logger_name, filename, force_flush, truncate);
 }
 
 // Create multi/single threaded rotating file logger

include/spdlog/sinks/file_sinks.h

@@ -30,10 +30,11 @@ class simple_file_sink : public base_sink < Mutex >
 {
 public:
     explicit simple_file_sink(const filename_t &filename,
-                              bool force_flush = false) :
+                              bool force_flush = false,
+                              bool truncate = false) :
         _file_helper(force_flush)
     {
-        _file_helper.open(filename);
+        _file_helper.open(filename, truncate);
     }
     void flush() override
     {

include/spdlog/spdlog.h

@@ -71,8 +71,8 @@ void set_sync_mode();
 //
 // Create and register multi/single basic file logger
 //
-std::shared_ptr<logger> basic_logger_mt(const std::string& logger_name, const filename_t& filename,bool force_flush = false);
-std::shared_ptr<logger> basic_logger_st(const std::string& logger_name, const filename_t& filename, bool force_flush = false);
+std::shared_ptr<logger> basic_logger_mt(const std::string& logger_name, const filename_t& filename,bool force_flush = false, bool truncate = false);
+std::shared_ptr<logger> basic_logger_st(const std::string& logger_name, const filename_t& filename, bool force_flush = false, bool truncate = false);
 
 //
 // Create and register multi/single threaded rotating file logger