changectx: use unfiltered changelog to access parents of unfiltered revs
If a revision is not filtered, we know that its parents are not either. So we
can take a shortcut. This shortcut avoid the computation of all filtered revs in
some cases.
Differential Revision: https://phab.mercurial-scm.org/D7487
# stack.py - Mercurial functions for stack definition
#
# Copyright Matt Mackall <mpm@selenic.com> and other
#
# 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
def getstack(repo, rev=None):
"""return a sorted smartrev of the stack containing either rev if it is
not None or the current working directory parent.
The stack will always contain all drafts changesets which are ancestors to
the revision and are not merges.
"""
if rev is None:
rev = b'.'
revspec = b'only(%s) and not public() and not ::merge()'
revisions = repo.revs(revspec, rev)
revisions.sort()
return revisions