core/utils/Logger.h

#ifndef CORE_LOGGER_H
#define CORE_LOGGER_H

#include "utils/ArrayString.h"

namespace Core::Logger {
    enum class Level { ERROR, WARNING, INFO, DEBUG };
    extern Level level;

    // aborts on critical logging failure
    template<typename... Args>
    void log(Level l, const char* file, int line, const char* start,
             const char* format, Args&&... args) {
        if(Core::Logger::level < l) {
            return;
        }
        Core::ArrayString<2048> s;
        if(s.append(format)) {
            printf(
                "\33[1;31m%s:%d contains an invalid format string\33[39;49m\n",
                file, line);
        } else if(s.format(Core::forward<Args>(args)...)) {
            printf("\33[1;31m%s:%d formatting failed\33[39;49m\n", file, line);
        } else if(fputs(start, stdout) < 0 || s.print() ||
                  printf("\33[39;49m\n") <= 0) {
            Core::exitWithHandler(1);
        }
    }
}

#if defined(CORE_LOG_LEVEL) && CORE_LOG_LEVEL >= 1
#define CORE_LOG_ERROR(format, ...)                                            \
    log(Core::Logger::Level::ERROR, __FILE__, __LINE__, "\33[1;31m[ERROR] ",   \
        format, __VA_ARGS__);
#else
#define CORE_LOG_ERROR(format, ...)
#endif

#if defined(CORE_LOG_LEVEL) && CORE_LOG_LEVEL >= 2
#define CORE_LOG_WARNING(format, ...)                                          \
    log(Core::Logger::Level::WARNING, __FILE__, __LINE__,                      \
        "\33[1;33m[WARNING] ", format, __VA_ARGS__);
#else
#define CORE_LOG_WARNING(format, ...)
#endif

#if defined(CORE_LOG_LEVEL) && CORE_LOG_LEVEL >= 3
#define CORE_LOG_INFO(format, ...)                                             \
    log(Core::Logger::Level::INFO, __FILE__, __LINE__, "\33[1;37m[INFO] ",     \
        format, __VA_ARGS__);
#else
#define CORE_LOG_INFO(format, ...)
#endif

#if defined(CORE_LOG_LEVEL) && CORE_LOG_LEVEL >= 4
#define CORE_LOG_DEBUG(format, ...)                                            \
    log(Core::Logger::Level::DEBUG, __FILE__, __LINE__, "\33[1;32m[DEBUG] ",   \
        format, __VA_ARGS__);
#else
#define CORE_LOG_DEBUG(format, ...)
#endif

#endif