def _rcfiles(path):

    rcs = [os.path.join(path, 'hgrc')]

    rcdir = os.path.join(path, 'hgrc.d')

    try:

        rcs.extend([os.path.join(rcdir, f)

                    for f, kind in osutil.listdir(rcdir)

                    if f.endswith(".rc")])

    except OSError:

        pass

    return rcs

def systemrcpath():

    path = []

    if sys.platform == 'plan9':

        root = 'lib/mercurial'

    else:

        root = 'etc/mercurial'

    # old mod_python does not set sys.argv

    if len(getattr(sys, 'argv', [])) > 0:

        p = os.path.dirname(os.path.dirname(sys.argv[0]))

        if p != '/':

            path.extend(_rcfiles(os.path.join(p, root)))

    path.extend(_rcfiles('/' + root))

    return path

def userrcpath():

    if sys.platform == 'plan9':

        return [os.environ['home'] + '/lib/hgrc']

    else:

        return [os.path.expanduser('~/.hgrc')]