text: //
  // Copyright(c) 2018 Gabi Melman.
  // Distributed under the MIT License (http://opensource.org/licenses/MIT)
  //
  
  #include "benchmark/benchmark.h"
  
  #include "spdlog/spdlog.h"
  #include "spdlog/details/pattern_formatter.h"
  
  void bench_formatter(benchmark::State &state, std::string pattern)
  {
      auto formatter = spdlog::details::make_unique<spdlog::pattern_formatter>(pattern);
      fmt::memory_buffer dest;
      std::string logger_name = "logger-name";
      const char *text = "Hello. This is some message with length of 80                                   ";
  
      spdlog::source_loc source_loc{"a/b/c/d/myfile.cpp", 123, "some_func()"};
      spdlog::details::log_msg msg(source_loc, logger_name, spdlog::level::info, text);
  
      for (auto _ : state)
      {
          dest.clear();
          formatter->format(msg, dest);
          benchmark::DoNotOptimize(dest);
      }
  }
  
  void bench_formatters()
  {
      // basic patterns(single flag)
      std::string all_flags = "+vtPnlLaAbBcCYDmdHIMSefFprRTXzEisg@luioO%";
      std::vector<std::string> basic_patterns;
      for (auto &flag : all_flags)
      {
          auto pattern = std::string("%") + flag;
          benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
  
          //        pattern = std::string("%16") + flag;
          //        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
          //
          //        // bench center padding
          //        pattern = std::string("%=16") + flag;
          //        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
      }
  
      // complex patterns
      std::vector<std::string> patterns = {
          "[%D %X] [%l] [%n] %v",
          "[%Y-%m-%d %H:%M:%S.%e] [%l] [%n] %v",
          "[%Y-%m-%d %H:%M:%S.%e] [%l] [%n] [%t] %v",
      };
      for (auto &pattern : patterns)
      {
          benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern)->Iterations(2500000);
      }
  }
  
  int main(int argc, char *argv[])
  {
  
      spdlog::set_pattern("[%^%l%$] %v");
      if (argc != 2)
      {
          spdlog::error("Usage: {} <pattern> (or \"all\" to bench all)", argv[0]);
          exit(1);
      }
  
      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();
  }
  