better support for custom eol

include/spdlog/common.h

@@ -20,11 +20,13 @@
 #include <spdlog/details/null_mutex.h>
 
 
-//visual studio upto 2013 does not support noexcept
+//visual studio upto 2013 does not support noexcept nor constexpr
 #if defined(_MSC_VER) && (_MSC_VER < 1900)
 #define SPDLOG_NOEXCEPT throw()
+#define SPDLOG_CONSTEXPR
 #else
 #define SPDLOG_NOEXCEPT noexcept
+#define SPDLOG_CONSTEXPR constexpr
 #endif
 
 

include/spdlog/details/os.h

@@ -112,30 +112,19 @@ inline bool operator!=(const std::tm& tm1, const std::tm& tm2)
     return !(tm1 == tm2);
 }
 
+// eol at end of each log line
+#if !defined (SPDLOG_EOL)
 #ifdef _WIN32
-inline const char* eol()
-{
-    return "\r\n";
-}
+#define SPDLOG_EOL "\r\n"
 #else
-constexpr inline const char* eol()
-{
-    return "\n";
-}
+#define SPDLOG_EOL "\n"
 #endif
-
-#ifdef _WIN32
-inline unsigned short eol_size()
-{
-    return 2;
-}
-#else
-constexpr inline unsigned short eol_size()
-{
-    return 1;
-}
 #endif
 
+SPDLOG_CONSTEXPR static const char* eol = SPDLOG_EOL;
+SPDLOG_CONSTEXPR static int eol_size = sizeof(SPDLOG_EOL) - 1;
+
+
 //fopen_s on non windows for writing
 inline int fopen_s(FILE** fp, const filename_t& filename, const filename_t& mode)
 {

include/spdlog/details/pattern_formatter_impl.h

@@ -619,11 +619,7 @@ inline void spdlog::pattern_formatter::format(details::log_msg& msg)
             f->format(msg, tm_time);
         }
         //write eol
-#if defined(SPDLOG_EOL)
-        msg.formatted << SPDLOG_EOL;
-#else
-        msg.formatted.write(details::os::eol(), details::os::eol_size());
-#endif
+		msg.formatted.write(details::os::eol, details::os::eol_size);
     }
     catch(const fmt::FormatError& e)
     {

include/spdlog/tweakme.h

@@ -65,6 +65,6 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 ///////////////////////////////////////////////////////////////////////////////
-// uncomment the below to override spdlog's default eol
-// #define SPDLOG_EOL "\n"
+// Uncomment to override default eol ("\n" or "\r\n" under Linux/Windows) 
+// #define SPDLOG_EOL ";-)\n"
 ///////////////////////////////////////////////////////////////////////////////

tests/format.cpp

@@ -12,10 +12,8 @@ std::string log_info(const T& what, spdlog::level::level_enum logger_level = spd
     oss_logger.set_level(logger_level);
     oss_logger.set_pattern("%v");
     oss_logger.info() << what;
-
-    //strip last eol and return the logged string
-    auto eol_size = strlen(spdlog::details::os::eol());
-    return oss.str().substr(0, oss.str().length() - eol_size);
+    
+    return oss.str().substr(0, oss.str().length() - spdlog::details::os::eol_size);
 }