Add another "tweak" to enable `printf` formatting

include/spdlog/details/logger_impl.h

@@ -67,7 +67,11 @@ inline void spdlog::logger::log(level::level_enum lvl, const char* fmt, const Ar
     try
     {
         details::log_msg log_msg(&_name, lvl);
-        log_msg.raw.write(fmt, args...);
+#ifdef SPDLOG_PRINTF_FORMATTING
+		log_msg.raw << fmt::sprintf(fmt, args...);
+#else
+		log_msg.raw.write(fmt, args...);
+#endif
         _sink_it(log_msg);
     }
     catch (const std::exception &ex)

include/spdlog/tweakme.h

@@ -139,3 +139,13 @@
 // #define SPDLOG_LEVEL_NAMES  { "   TRACE", "   DEBUG", "    INFO",
 // " WARNING", "   ERROR", "CRITICAL", "OFF" };
 ///////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to use printf formatting:
+// logger->log("Message %d: Hello %s", 1, "world")
+//
+// Otherwise use the python formatting:
+// logger->log("Message {}: Hello {}", 1, "world")
+//
+// #define SPDLOG_PRINTF_FORMATTING
+///////////////////////////////////////////////////////////////////////////////