def parser(options=None):
    """ Parser for VetRedRockGui
    Parameters
    ----------
    options

    Returns
    -------

    """
    import argparse
    parser = argparse.ArgumentParser(description=
        'Run the VetRedRockGUI on                                     RedRock output'
        )
    parser.add_argument('in_file', type=str, help='RedRock output FITS file')
    parser.add_argument('outfile', type=str, help='Output vetted .json file')
    parser.add_argument('--coadd_file', type=str, help=
        'YAML file for                        coadding; will print xval to screen'
        )
    if options is None:
        args = parser.parse_args()
    else:
        args = parser.parse_args(namespace=options)
    return args
