annotate hgext3rd/topic/compat.py @ 2922:66357d4d03b2

topic: centralize compatibility logic between hg versions into compat module

This patch can delay loading obsutil and obsolete modules until they
are actually used at "hg topics" or so, if demandimport of Mercurial
is enabled.

# 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

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