annotate hgext3rd/topic/compat.py @ 3248:07c9b6f445bf

stablerange: rework the debug command to allow for multiple method

Similar to what we did for the other debug command related to sorting, we
prepare for the arrival of multiple method to produce the result (including
simple implementation that are easy to read but do not scale).

# Copyright 2017 FUJIWARA Katsunori <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""
Compatibility module
"""
from __future__ import absolute_import

from mercurial import (
    obsolete,
    scmutil,
    util,
)

getmarkers = None
successorssets = None
try:
    from mercurial import obsutil
    getmarkers = getattr(obsutil, 'getmarkers', None)
    successorssets = getattr(obsutil, 'successorssets', None)
except ImportError:
    pass

if getmarkers is None:
    getmarkers = obsolete.getmarkers
if successorssets is None:
    successorssets = obsolete.successorssets

def startpager(ui, cmd):
    """function to start a pager in case ui.pager() exists"""
    try:
        ui.pager(cmd)
    except AttributeError:
        pass

def cleanupnodes(repo, replacements, operation, moves=None):
    # create obsmarkers and move bookmarks
    # XXX we should be creating marker as we go instead of only at the end,
    # this makes the operations more modulars
    if util.safehasattr(scmutil, 'cleanupnodes'):
        scmutil.cleanupnodes(repo, replacements, 'changetopics',
                             moves=moves)
    else:
        relations = [(repo[o], tuple(repo[n] for n in new))
                     for (o, new) in replacements.iteritems()]
        obsolete.createmarkers(repo, relations)