def add_cli_options(parser, cfgfile=None, datadir=None):
    """Add common CLI options to the given arg parser."""
    from . import config

    config.add_cli_options(parser, cfgfile)

    datadirhelp = "The directory in which to store data files."
    if datadir:
        datadirhelp += f" (default: {datadir!r})"
    parser.add_option(
        "-d",
        "--data-path",
        metavar="PATH",
        default=datadir,
        help=datadirhelp,
    )