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# std.experimental.logger.filelogger

alias `CreateFolder` = std.typecons.Flag!"`CreateFolder`".Flag;
  An option to create FileLogger directory if it is non-existent.
class `FileLogger`: std.experimental.logger.core.Logger;
  This Logger implementation writes log messages to the associated file. The name of the file has to be passed on construction time. If the file is already present new log messages will be append at its end.
  @safe this(in string `fn`, const LogLevel `lv` = LogLevel.all);
    A constructor for the FileLogger Logger.
    Parameters:

    string `fn` | The filename of the output file of the FileLogger. If that file can not be opened for writting an exception will be thrown.
    LogLevel `lv` | The LogLevel for the FileLogger. By default the

    Example

        auto l1 = new FileLogger("logFile");
        auto l2 = new FileLogger("logFile", LogLevel.fatal);
        auto l3 = new FileLogger("logFile", LogLevel.fatal, CreateFolder.yes);

  @safe this(in string `fn`, const LogLevel `lv`, CreateFolder `createFileNameFolder`);
    A constructor for the FileLogger Logger that takes a reference to a File.
    The File passed must be open for all the log call to the FileLogger. If the File gets closed, using the FileLogger for logging will result in undefined behaviour.
    Parameters:

    string `fn` | The file used for logging.
    LogLevel `lv` | The LogLevel for the FileLogger. By default the LogLevel for FileLogger is LogLevel.all.
    CreateFolder `createFileNameFolder` | if yes and `fn` contains a folder name, this folder will be created.

    Example

        auto file = File("logFile.log", "w");
        auto l1 = new FileLogger(file);
        auto l2 = new FileLogger(file, LogLevel.fatal);

  @safe this(File `file`, const LogLevel `lv` = LogLevel.all);
    A constructor for the FileLogger Logger that takes a reference to a File.
    The File passed must be open for all the log call to the FileLogger. If the File gets closed, using the FileLogger for logging will result in undefined behaviour.
    Parameters:

    File `file` | The `file` used for logging.
    LogLevel `lv` | The LogLevel for the FileLogger. By default the LogLevel for FileLogger is LogLevel.all.

    Example

        auto file = File("logFile.log", "w");
        auto l1 = new FileLogger(file);
        auto l2 = new FileLogger(file, LogLevel.fatal);

  @property @safe File `file`();
    If the FileLogger is managing the File it logs to, this method will return a reference to this File.
  string `getFilename`();
    If the FileLogger was constructed with a filename, this method returns this filename. Otherwise an empty string is returned.
  protected File `file_`;
    The File log messages are written to.
  protected string `filename`;
    The `filename` of the File log messages are written to.

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