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match: optimize matcher when all patterns are of rootfilesin kind...
match: optimize matcher when all patterns are of rootfilesin kind Internally at Google, we use narrowspecs with only rootfilesin-kind patterns. Sometimes there are thousands of such patterns (i.e. thousands of tracked directories). In such cases, it can take quite long to build and evaluate the resulting matcher. This patch optimizes matchers that have only patterns of rootfilesin so it instead of creating a regular expression, it matches the given file's directory against the set of directories. In a repo with ~3600 tracked directories, it takes about 1.35 s to build the matcher and 2.7 s to walk the dirstate before this patch. After, it takes 0.04 s to create the matcher and 0.87 s to walk the dirstate. It may be worthwhile to do similar optimizations for e.g. patterns of type "kind:", but that's not a priority for us right now. Differential Revision: https://phab.mercurial-scm.org/D5058

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children.py
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# Mercurial extension to provide the 'hg children' command
#
# Copyright 2007 by Intevation GmbH <intevation@intevation.de>
#
# Author(s):
# Thomas Arendsen Hein <thomas@intevation.de>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''command to display child changesets (DEPRECATED)
This extension is deprecated. You should use :hg:`log -r
"children(REV)"` instead.
'''
from __future__ import absolute_import
from mercurial.i18n import _
from mercurial import (
cmdutil,
logcmdutil,
pycompat,
registrar,
scmutil,
)
templateopts = cmdutil.templateopts
cmdtable = {}
command = registrar.command(cmdtable)
# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'ships-with-hg-core'
@command('children',
[('r', 'rev', '.',
_('show children of the specified revision'), _('REV')),
] + templateopts,
_('hg children [-r REV] [FILE]'),
inferrepo=True)
def children(ui, repo, file_=None, **opts):
"""show the children of the given or working directory revision
Print the children of the working directory's revisions. If a
revision is given via -r/--rev, the children of that revision will
be printed. If a file argument is given, revision in which the
file was last changed (after the working directory revision or the
argument to --rev if given) is printed.
Please use :hg:`log` instead::
hg children => hg log -r "children(.)"
hg children -r REV => hg log -r "children(REV)"
See :hg:`help log` and :hg:`help revsets.children`.
"""
opts = pycompat.byteskwargs(opts)
rev = opts.get('rev')
ctx = scmutil.revsingle(repo, rev)
if file_:
fctx = repo.filectx(file_, changeid=ctx.rev())
childctxs = [fcctx.changectx() for fcctx in fctx.children()]
else:
childctxs = ctx.children()
displayer = logcmdutil.changesetdisplayer(ui, repo, opts)
for cctx in childctxs:
displayer.show(cctx)
displayer.close()