mercurial/utils/repoviewutil.py

phabricator: extract the logic to amend diff properties to a function

This will be needed on a separate code path when dealing with folding revisions.
And since we know that will involve adding multiple local commmits to the diff
properties instead of just one, restructure the logic slightly to allow it.

Differential Revision: https://phab.mercurial-scm.org/D8312

# repoviewutil.py - constaints data relevant to repoview.py and other module
#
# Copyright 2012 Pierre-Yves David <[e-mail]>
#                Logilab SA        <[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.

from __future__ import absolute_import

### Nearest subset relation
# Nearest subset of filter X is a filter Y so that:
# * Y is included in X,
# * X - Y is as small as possible.
# This create and ordering used for branchmap purpose.
# the ordering may be partial
subsettable = {
    None: b'visible',
    b'visible-hidden': b'visible',
    b'visible': b'served',
    b'served.hidden': b'served',
    b'served': b'immutable',
    b'immutable': b'base',
}