hgext/narrow/narrowtemplates.py

narrow: import experimental extension from narrowhg revision cb51d673e9c5

Adjustments:
 * renamed src to hgext/narrow
 * marked extension experimental
 * added correct copyright header where it was missing
 * updated hgrc extension enable line in library.sh
 * renamed library.sh to narrow-library.sh
 * dropped all files from repo root as they're not interesting
 * dropped test-pyflakes.t, test-check-code.t and test-check-py3-compat.t
 * renamed remaining tests to all be test-narrow-* when they didn't already
 * fixed test-narrow-expanddirstate.t to refer to narrow and not narrowhg
 * fixed tests that wanted `update -C .` instead of `merge --abort`
 * corrected a two-space indent in narrowspec.py
 * added a missing _() in narrowcommands.py
 * fixed imports to pass the import checker
 * narrow only adds its --include and --exclude to clone if sparse isn't
   enabled to avoid breaking test-duplicateoptions.py. This is a kludge,
   and we'll need to come up with a better solution in the future.

These were more or less the minimum to import something that would
pass tests and not create a bunch of files we'll never use.

Changes I intend to make as followups:
 * rework the test-narrow-*-tree.t tests to use the new testcases
   functionality in run-tests.py
 * remove lots of monkeypatches of core things

Differential Revision: https://phab.mercurial-scm.org/D1974

# narrowtemplates.py - added template keywords for narrow clones
#
# Copyright 2017 Google, Inc.
#
# 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 mercurial import (
    revset,
    templatekw,
    util,
)

from . import narrowrevlog

def _isellipsis(repo, rev):
    if repo.changelog.flags(rev) & narrowrevlog.ELLIPSIS_NODE_FLAG:
        return True
    return False

def ellipsis(repo, ctx, templ, **args):
    """:ellipsis: String. 'ellipsis' if the change is an ellipsis node,
    else ''."""
    if _isellipsis(repo, ctx.rev()):
        return 'ellipsis'
    return ''

def outsidenarrow(repo, ctx, templ, **args):
    """:outsidenarrow: String. 'outsidenarrow' if the change affects no
    tracked files, else ''."""
    if util.safehasattr(repo, 'narrowmatch'):
        m = repo.narrowmatch()
        if not any(m(f) for f in ctx.files()):
            return 'outsidenarrow'
    return ''

def ellipsisrevset(repo, subset, x):
    """``ellipsis()``
    Changesets that are ellipsis nodes.
    """
    return subset.filter(lambda r: _isellipsis(repo, r))

def setup():
    templatekw.keywords['ellipsis'] = ellipsis
    templatekw.keywords['outsidenarrow'] = outsidenarrow

    revset.symbols['ellipsis'] = ellipsisrevset
    revset.safesymbols.add('ellipsis')