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−# stack.py - Mercurial functions for stack definition
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−#
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−#  Copyright Matt Mackall <mpm@selenic.com> and other
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−#
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−# This software may be used and distributed according to the terms of the
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−# GNU General Public License version 2 or any later version.
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−
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−from __future__ import absolute_import
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−
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−
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−def getstack(repo, rev=None):
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−    """return a sorted smartrev of the stack containing either rev if it is
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−    not None or the current working directory parent.
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−
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−    The stack will always contain all drafts changesets which are ancestors to
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−    the revision and are not merges.
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−    """
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−    if rev is None:
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−        rev = b'.'
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−
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−    revspec = b'only(%s) and not public() and not ::merge()'
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−    revisions = repo.revs(revspec, rev)
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−    revisions.sort()
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−    return revisions