mercurial/stack.py

stack: add a new module for stack-related commands

Bootstrap the module with a function that returns the stack for the current
revision. The definition of the stack is ihnerited from histedit default
revset and used by hg show stack.

Differential Revision: https://phab.mercurial-scm.org/D2395

# stack.py - Mercurial functions for stack definition
#
#  Copyright Matt Mackall <[e-mail]> 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

from . import (
    revsetlang,
    scmutil,
)

def getstack(repo, rev=None):
    """return a 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 = '.'

    revspec = 'reverse(only(%s) and not public() and not ::merge())'
    revset = revsetlang.formatspec(revspec, rev)
    return scmutil.revrange(repo, [revset])