docs: def add_command_line_options(add_argument, use_short_options=True):
      """
      :param add_argument: The add_argument method of an ArgParser.
      :param use_short_options: Whether or not to add short options.
      """
      logger_args = ("--enable-logger",)
      credentials_args = ("--credentials",)
      if use_short_options:
          logger_args += ('-l',)
          credentials_args += ('-c',)
      add_argument(*logger_args, dest='enabled_loggers',
                   action="append", default=[],
                   help="Enable the specified logger.")
      add_argument(*credentials_args, dest='credential_files',
                   action="append", default=[],
                   help="Use the specified credentials module to update "
                   "the values in okcupyd.settings.")
      add_argument('--echo', dest='echo', action='store_true', default=False,
                   help="Echo SQL.")