njin_log.h

#pragma once
#include "_types.h"
#include <cstdio>
#include <cstdlib>
 
// Usage:
//   NJIN_INFO("player spawned at %.1f, %.1f", pos.x, pos.y);
//   NJIN_WARN("texture missing: %s", path);
//   njin::log_set_level(njin::log_warn);  // hide trace/debug/info
//
// Output: [  1.234] WARN  file.cpp:42  message
// The window/audio backend's own messages go through the same logger, tagged
// "njin" like the engine's own: njin seals it off from game code (see
// src/engine/guard/), so the log should not name it either.

#if defined(__MINGW_PRINTF_FORMAT)
#define NJIN_PRINTF(fmt, args) __attribute__((format(__MINGW_PRINTF_FORMAT, fmt, args)))
#elif defined(__GNUC__) || defined(__clang__)
#define NJIN_PRINTF(fmt, args) __attribute__((format(printf, fmt, args)))
#else
#define NJIN_PRINTF(fmt, args)
#endif
 
namespace njin {

enum log_level {
  log_trace, 
  log_debug, 
  log_info,  
  log_warn,  
  log_error, 
  log_fatal, 
  log_off    
};

using log_sink = void (*)(log_level level, const char *file, i32 line,
                          const char *msg, void *user);

void log_set_level(log_level level);

log_level log_get_level();

bool log_enabled(log_level level);

void log_set_sink(log_sink sink, void *user = nullptr);

const char *log_level_name(log_level level);

void log_write(log_level level, const char *file, i32 line, const char *fmt,
               ...) NJIN_PRINTF(4, 5);
} // namespace njin


#define NJIN_LOG(level, ...)                                                   \
  ::njin::log_write((level), __FILE__, __LINE__, __VA_ARGS__)

#define NJIN_TRACE(...) NJIN_LOG(::njin::log_trace, __VA_ARGS__)
#define NJIN_DEBUG(...) NJIN_LOG(::njin::log_debug, __VA_ARGS__)
#define NJIN_INFO(...) NJIN_LOG(::njin::log_info, __VA_ARGS__)
#define NJIN_WARN(...) NJIN_LOG(::njin::log_warn, __VA_ARGS__)
#define NJIN_ERROR(...) NJIN_LOG(::njin::log_error, __VA_ARGS__)
#define NJIN_FATAL(...)                                                        \
  do {                                                                         \
    NJIN_LOG(::njin::log_fatal, __VA_ARGS__);                                  \
    std::abort();                                                              \
  } while (0)