def status_mercurial(path, ignore_set, options):
    """Run hg status.

    Returns a 2-element tuple:
    * Text lines describing the status of the repository.
    * Empty sequence of subrepos, since hg does not support them.
    """
    lines = run(['hg', '--config', 'extensions.color=!', 'st'], cwd=path)
    subrepos = ()
    return [b' ' + l for l in lines if not l.startswith(b'?')], subrepos