log.h

/*
 * Copyright 2021 Andrei Pangin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _LOG_H
#define _LOG_H

#include <stdarg.h>
#include <stdio.h>

#ifdef __GNUC__
#define ATTR_FORMAT __attribute__((format(printf, 1, 2)))
#else
#define ATTR_FORMAT
#endif

enum LogLevel { LOG_TRACE, LOG_DEBUG, LOG_INFO, LOG_WARN, LOG_ERROR, LOG_NONE };

class Arguments;

class Log {
private:
  static FILE *_file;
  static LogLevel _level;

public:
  static const char *const LEVEL_NAME[];

  static void open(Arguments &args);
  static void open(const char *file_name, const char *level);
  static void close();

  static void log(LogLevel level, const char *msg, va_list args);

  static void ATTR_FORMAT trace(const char *msg, ...);
  static void ATTR_FORMAT debug(const char *msg, ...);
  static void ATTR_FORMAT info(const char *msg, ...);
  static void ATTR_FORMAT warn(const char *msg, ...);
  static void ATTR_FORMAT error(const char *msg, ...);

  static LogLevel level() { return _level; }
};

#endif // _LOG_H