revset: stop serializing node when using "%ln"
Turning hundred of thousand of node from node to hex and back can be slow… what
about we stop doing it?
In many case were we are using node id we should be using revision id. However
this is not a good reason to have a stupidly slow implementation of "%ln".
This caught my attention again because the phase discovery during push make an
extensive use of "%ln" or huge set. In absolute, that phase discovery probably
should use "%ld" and need to improves its algorithmic complexity, but improving
"%ln" seems simple and long overdue. This greatly speeds up `hg push` on
repository with many drafts.
Here are some relevant poulpe benchmarks:
### data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog
# benchmark.name = hg.command.push
# bin-env-vars.hg.flavor = default
# bin-env-vars.hg.py-re2-module = default
# benchmark.variants.explicit-rev = all-out-heads
# benchmark.variants.issue6528 = disabled
# benchmark.variants.protocol = ssh
# benchmark.variants.reuse-external-delta-parent = default
## benchmark.variants.revs = any-1-extra-rev
before: 44.235070
after: 20.416329 (-53.85%, -23.82)
## benchmark.variants.revs = any-100-extra-rev
before: 49.234697
after: 26.519829 (-46.14%, -22.71)
### benchmark.name = hg.command.bundle
# bin-env-vars.hg.flavor = default
# bin-env-vars.hg.py-re2-module = default
# benchmark.variants.revs = all
# benchmark.variants.type = none-streamv2
## data-env-vars.name = heptapod-public-2024-03-25-zstd-sparse-revlog
before: 10.138396
after: 7.750458 (-23.55%, -2.39)
## data-env-vars.name = mercurial-public-2024-03-22-zstd-sparse-revlog
before: 1.263859
after: 0.700229 (-44.60%, -0.56)
## data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog
before: 399.484481
after: 346.5089 (-13.26%, -52.98)
## data-env-vars.name = pypy-2024-03-22-zstd-sparse-revlog
before: 4.540080
after: 3.401700 (-25.07%, -1.14)
## data-env-vars.name = tryton-public-2024-03-22-zstd-sparse-revlog
before: 2.975765
after: 1.870798 (-37.13%, -1.10)
# 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 mercurial.i18n import _
from mercurial import (
cmdutil,
logcmdutil,
pycompat,
registrar,
)
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 = b'ships-with-hg-core'
@command(
b'children',
[
(
b'r',
b'rev',
b'.',
_(b'show children of the specified revision'),
_(b'REV'),
),
]
+ templateopts,
_(b'hg children [-r REV] [FILE]'),
helpcategory=command.CATEGORY_CHANGE_NAVIGATION,
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`.
"""
rev = opts.get('rev')
ctx = logcmdutil.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, pycompat.byteskwargs(opts)
)
for cctx in childctxs:
displayer.show(cctx)
displayer.close()