Handle file extensions in rotating and daily loggers

README.md

@@ -113,12 +113,12 @@ int main(int, char*[])
         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/mylogfile", 1048576 * 5, 3);
+        auto rotating_logger = spd::rotating_logger_mt("some_logger_name", "logs/mylogfile.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", 2, 30);
+        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);

example/example.cpp

@@ -1,4 +1,4 @@
-//
+//
 // Copyright(c) 2015 Gabi Melman.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
 //
@@ -43,16 +43,16 @@ int main(int, char*[])
 
 
         // Create basic file logger (not rotated)
-        auto my_logger = spd::basic_logger_mt("basic_logger", "logs/basic");
+        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/mylogfile", 1048576 * 5, 3);
+        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", 2, 30);
+        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);
@@ -111,8 +111,7 @@ 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");
+    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);
 }

include/spdlog/details/file_helper.h

@@ -16,6 +16,7 @@
 #include <cstdio>
 #include <string>
 #include <thread>
+#include <tuple>
 #include <cerrno>
 
 namespace spdlog
@@ -84,14 +85,13 @@ public:
 
     void write(const log_msg& msg)
     {
-
         size_t msg_size = msg.formatted.size();
         auto data = msg.formatted.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()
+    size_t size() const
     {
         if (!_fd)
             throw spdlog_ex("Cannot use size() on closed file " + os::filename_to_str(_filename));
@@ -103,10 +103,30 @@ public:
         return _filename;
     }
 
-    static bool file_exists(const filename_t& name)
+    static bool file_exists(const filename_t& fname)
     {
+        return os::file_exists(fname);
+    }
 
-        return os::file_exists(name);
+	//
+	// return basename and extension:
+	//
+	// "mylog.txt" => ("mylog", ".txt")	
+	// "mylog" => ("mylog", "")	
+	//
+	// the starting dot in filenames is ignored (hidden files):
+	//
+	// "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 filename_t& fname)
+	{		
+		auto index = fname.rfind('.');
+		bool found_ext = index != filename_t::npos && index !=0 && fname[index - 1] != details::os::folder_sep;
+		if (found_ext)		
+			return std::make_tuple(fname.substr(0, index), fname.substr(index));					
+		else		
+			return std::make_tuple(fname, filename_t());		
 	}
 
 private:

include/spdlog/details/os.h

@@ -143,6 +143,16 @@ inline bool operator!=(const std::tm& tm1, const std::tm& tm2)
 SPDLOG_CONSTEXPR static const char* eol = SPDLOG_EOL;
 SPDLOG_CONSTEXPR static int eol_size = sizeof(SPDLOG_EOL) - 1;
 
+
+
+// folder separator
+#ifdef _WIN32
+SPDLOG_CONSTEXPR static const char folder_sep = '\\';
+#else
+SPDLOG_CONSTEXPR static const char folder_sep = '/';
+#endif
+
+
 inline void prevent_child_fd(FILE *f)
 {
 #ifdef _WIN32

include/spdlog/sinks/file_sinks.h

@@ -77,6 +77,23 @@ public:
         _current_size = _file_helper.size(); //expensive. called only once
     }
 
+	// calc filename according to index and file extension if exists.
+	// e.g. calc_filename("logs/mylog.txt, 3) => "logs/mylog.3.txt".
+	static filename_t calc_filename(const filename_t& filename, std::size_t index)
+	{
+		std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
+		if (index) 
+		{
+			filename_t basename, ext;
+			std::tie(basename, ext) = details::file_helper::split_by_extenstion(filename);
+			w.write(SPDLOG_FILENAME_T("{}.{}{}"), basename, index, ext);
+		}
+		else 
+		{
+			w.write(SPDLOG_FILENAME_T("{}"), filename);
+		}			
+		return w.str();
+	}
 
 protected:
     void _sink_it(const details::log_msg& msg) override
@@ -95,23 +112,13 @@ protected:
         _file_helper.flush();
     }
 	
+
 private:	
-    static filename_t calc_filename(const filename_t& filename, std::size_t index)
-    {
-        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
-        if (index)
-            w.write(SPDLOG_FILENAME_T("{}.{}"), filename, index);
-        else
-            w.write(SPDLOG_FILENAME_T("{}"), filename);
-        return w.str();
-    }
-
     // Rotate files:
-    // log.txt -> log.txt.1
+    // log.txt -> log.1.txt
-    // log.txt.1 -> log.txt.2
+    // log.1.txt -> log.2.txt
-    // log.txt.2 -> log.txt.3
+    // log.2.txt -> log.3.txt
-    // lo3.txt.3 -> delete
+    // log.3.txt -> delete
-
     void _rotate()
     {
         using details::os::filename_to_str;
@@ -150,27 +157,31 @@ typedef rotating_file_sink<details::null_mutex>rotating_file_sink_st;
  */
 struct default_daily_file_name_calculator
 {
-    // Create filename for the form basename.YYYY-MM-DD_hh-mm
+    // Create filename for the form filename.YYYY-MM-DD_hh-mm.ext
-    static filename_t calc_filename(const filename_t& basename)
+    static filename_t calc_filename(const filename_t& filename)
     {
         std::tm tm = spdlog::details::os::localtime();
+		filename_t basename, ext;
+		std::tie(basename, ext) = details::file_helper::split_by_extenstion(filename);
         std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
-        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}_{:02d}-{:02d}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min);
+        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}_{:02d}-{:02d}{}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, ext);
         return w.str();
     }
 };
 
 /*
- * Generator of daily log file names in format basename.YYYY-MM-DD
+ * Generator of daily log file names in format basename.YYYY-MM-DD.ext
  */
 struct dateonly_daily_file_name_calculator
 {
     // Create filename for the form basename.YYYY-MM-DD
-    static filename_t calc_filename(const filename_t& basename)
+    static filename_t calc_filename(const filename_t& filename)
     {
         std::tm tm = spdlog::details::os::localtime();
+		filename_t basename, ext;
+		std::tie(basename, ext) = details::file_helper::split_by_extenstion(filename);
         std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
-        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}{}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, ext);
         return w.str();
     }
 };

tests/file_helper.cpp

@@ -73,6 +73,77 @@ TEST_CASE("file_helper_reopen2", "[file_helper::reopen(false)]]")
     REQUIRE(helper.size() == expected_size);
 }
 
+TEST_CASE("file_helper_split_by_extenstion", "[file_helper::split_by_extenstion()]]")
+{
+	std::string basename, ext;
+	std::tie(basename, ext) = file_helper::split_by_extenstion("mylog.txt");	
+	REQUIRE(basename == "mylog");	
+	REQUIRE(ext == ".txt");
+}
+
+TEST_CASE("file_helper_split_by_extenstion2", "[file_helper::split_by_extenstion()]]")
+{
+	std::string basename, ext;
+	std::tie(basename, ext) = file_helper::split_by_extenstion("mylog");
+	REQUIRE(basename == "mylog");
+	REQUIRE(ext == "");
+}
+
+TEST_CASE("file_helper_split_by_extenstion3", "[file_helper::split_by_extenstion()]]")
+{
+	std::string basename, ext;
+	std::tie(basename, ext) = file_helper::split_by_extenstion("mylog.xyz.txt");
+	REQUIRE(basename == "mylog.xyz");
+	REQUIRE(ext == ".txt");
+}
+
+
+TEST_CASE("file_helper_split_by_extenstion4", "[file_helper::split_by_extenstion()]]")
+{
+	std::string basename, ext;
+	std::tie(basename, ext) = file_helper::split_by_extenstion("mylog.xyz....txt");
+	REQUIRE(basename == "mylog.xyz...");
+	REQUIRE(ext == ".txt");
+}
+
+TEST_CASE("file_helper_split_by_extenstion5", "[file_helper::split_by_extenstion(hidden_file)]]")
+{
+	std::string basename, ext;
+	std::tie(basename, ext) = file_helper::split_by_extenstion(".mylog");
+	REQUIRE(basename == ".mylog");
+	REQUIRE(ext == "");
+}
+
+TEST_CASE("file_helper_split_by_extenstion6", "[file_helper::split_by_extenstion(hidden_file)]]")
+{	
+#ifdef _WIN32
+	auto filename = "folder\\.mylog";	
+	auto expected_basename = "folder\\.mylog";
+#else
+	auto filename = "folder/.mylog";	
+	auto expected_basename = "folder/.mylog";
+#endif
+	std::string basename, ext;
+	std::tie(basename, ext) = file_helper::split_by_extenstion(filename);
+	REQUIRE(basename == expected_basename);
+	REQUIRE(ext == "");
+}
+
+TEST_CASE("file_helper_split_by_extenstion7", "[file_helper::split_by_extenstion(hidden_file)]]")
+{
+#ifdef _WIN32
+	auto filename = "folder\\.mylog.txt";
+	auto expected_basename = "folder\\.mylog";
+#else
+	auto filename = "folder/.mylog.txt";
+	auto expected_basename = "folder//.mylog";
+#endif
+	std::string basename, ext;
+	std::tie(basename, ext) = file_helper::split_by_extenstion(filename);
+	REQUIRE(basename == expected_basename);
+	REQUIRE(ext == ".txt");
+}
+
 
 
 

tests/file_log.cpp

@@ -188,3 +188,55 @@ TEST_CASE("daily_logger with custom calculator", "[daily_logger_custom]]")
     REQUIRE(count_lines(filename) == 10);
 }
 
+
+/*
+ * File name calculations
+ */
+
+TEST_CASE("rotating_file_sink::calc_filename1", "[rotating_file_sink]]")
+{
+	auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated.txt", 3);
+	REQUIRE(filename == "rotated.3.txt");
+}
+
+TEST_CASE("rotating_file_sink::calc_filename2", "[rotating_file_sink]]")
+{
+	auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated", 3);
+	REQUIRE(filename == "rotated.3");
+}
+
+TEST_CASE("rotating_file_sink::calc_filename3", "[rotating_file_sink]]")
+{
+	auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated.txt", 0);
+	REQUIRE(filename == "rotated.txt");
+}
+
+
+TEST_CASE("daily_file_sink::default_daily_file_name_calculator1", "[daily_file_sink]]")
+{
+	// daily.YYYY-MM-DD_hh-mm.txt	
+	auto filename = spdlog::sinks::default_daily_file_name_calculator::calc_filename("daily.txt");		
+	std::regex re(R"(^daily_(19|20)\d\d-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])_\d\d-[0-5][0-9].txt$)");
+	std::smatch match;
+	REQUIRE(std::regex_match(filename, match, re));	
+}
+
+TEST_CASE("daily_file_sink::default_daily_file_name_calculator2", "[daily_file_sink]]")
+{
+	// daily.YYYY-MM-DD_hh-mm.txt	
+	auto filename = spdlog::sinks::default_daily_file_name_calculator::calc_filename("daily");	
+	std::regex re(R"(^daily_(19|20)\d\d-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])_\d\d-[0-5][0-9]$)");
+	std::smatch match;
+	REQUIRE(std::regex_match(filename, match, re));
+}
+
+TEST_CASE("daily_file_sink::dateonly_daily_file_name_calculator", "[daily_file_sink]]")
+{
+	// daily.YYYY-MM-DD_hh-mm.txt	
+	auto filename = spdlog::sinks::dateonly_daily_file_name_calculator::calc_filename("daily.txt");
+	// date regex based on https://www.regular-expressions.info/dates.html
+	std::regex re(R"(^daily_(19|20)\d\d-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])\.txt$)");
+	std::smatch match;
+	REQUIRE(std::regex_match(filename, match, re));
+}
+

tests/includes.h

@@ -6,7 +6,7 @@
 #include <ostream>
 #include <chrono>
 #include <exception>
-
+#include <regex>
 #include "catch.hpp"
 #include "utils.h"