# debugcommands.py - command processing for debug* commands

#

# Copyright 2005-2016 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import os

from .i18n import _

from . import (

    cmdutil,

    commands,

    error,

    revlog,

    scmutil,

)

# We reuse the command table from commands because it is easier than

# teaching dispatch about multiple tables.

command = cmdutil.command(commands.table)

@command('debugancestor', [], _('[INDEX] REV1 REV2'), optionalrepo=True)

def debugancestor(ui, repo, *args):

    """find the ancestor revision of two revisions in a given index"""

    if len(args) == 3:

        index, rev1, rev2 = args

        r = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), index)

        lookup = r.lookup

    elif len(args) == 2:

        if not repo:

            raise error.Abort(_('there is no Mercurial repository here '

                                '(.hg not found)'))

        rev1, rev2 = args

        r = repo.changelog

        lookup = repo.lookup

    else:

        raise error.Abort(_('either two or three arguments required'))

    a = r.ancestor(lookup(rev1), lookup(rev2))

    ui.write('%d:%s\n' % (r.rev(a), hex(a)))