Added the all flag to bench formatter

bench/formatter-bench.cpp

@@ -28,9 +28,7 @@ void bench_formatter(benchmark::State &state, std::string pattern)
     std::string logger_name = "logger-name";
     const char *text = "Hello. This is some message with length of 80                                   ";
 
-    spdlog::details::log_msg msg(spdlog::source_loc{__FILE__, __LINE__}, &logger_name, spdlog::level::info, text);
-    //    formatter->format(msg, dest);
-    //    printf("%s\n", fmt::to_string(dest).c_str());
+    spdlog::details::log_msg msg(&logger_name, spdlog::level::info, text);
 
     for (auto _ : state)
     {
@@ -73,15 +71,22 @@ void bench_formatters()
 int main(int argc, char *argv[])
 {
 
-    if (argc > 1) // bench given pattern
+    spdlog::set_pattern("[%^%l%$] %v");
+    if(argc != 2)
     {
-        std::string pattern = argv[1];
-        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
+        spdlog::error("Usage: {} format-flag (or \"all\" to bench all)", argv[0]);
+        exit(1);
     }
-    else // bench all flags
+
+    std::string pattern = argv[1];
+    if(pattern == "all")
     {
         bench_formatters();
     }
+    else
+    {
+        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
+    }
     benchmark::Initialize(&argc, argv);
     benchmark::RunSpecifiedBenchmarks();
 }