branchcache: skip entries that are topological heads in the on disk file
In the majority of cases, topological heads are also branch heads. We have
efficient way to get the topological heads and efficient way to retrieve
their branch information. So there is little value in putting them in the branch
cache file explicitly. On the contrary, writing them explicitly tend to create
very large cache file that are inefficient to read and update.
So the branch cache v3 format is no longer including them. This changeset focus
on the format aspect and have no focus on the performance aspect. We will cover
that later.
# commitextras.py
#
# Copyright 2013 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''adds a new flag extras to commit (ADVANCED)'''
import re
from mercurial.i18n import _
from mercurial import (
commands,
error,
extensions,
registrar,
)
cmdtable = {}
command = registrar.command(cmdtable)
testedwith = b'ships-with-hg-core'
usedinternally = {
b'amend_source',
b'branch',
b'close',
b'histedit_source',
b'topic',
b'rebase_source',
b'intermediate-source',
b'__touch-noise__',
b'source',
b'transplant_source',
}
def extsetup(ui):
entry = extensions.wrapcommand(commands.table, b'commit', _commit)
options = entry[1]
options.append(
(
b'',
b'extra',
[],
_(b'set a changeset\'s extra values'),
_(b"KEY=VALUE"),
)
)
def _commit(orig, ui, repo, *pats, **opts):
if hasattr(repo, 'unfiltered'):
repo = repo.unfiltered()
class repoextra(repo.__class__):
def commit(self, *innerpats, **inneropts):
extras = opts.get('extra')
for raw in extras:
if b'=' not in raw:
msg = _(
b"unable to parse '%s', should follow "
b"KEY=VALUE format"
)
raise error.InputError(msg % raw)
k, v = raw.split(b'=', 1)
if not k:
msg = _(b"unable to parse '%s', keys can't be empty")
raise error.InputError(msg % raw)
if re.search(br'[^\w-]', k):
msg = _(
b"keys can only contain ascii letters, digits,"
b" '_' and '-'"
)
raise error.InputError(msg)
if k in usedinternally:
msg = _(
b"key '%s' is used internally, can't be set "
b"manually"
)
raise error.InputError(msg % k)
inneropts['extra'][k] = v
return super(repoextra, self).commit(*innerpats, **inneropts)
repo.__class__ = repoextra
return orig(ui, repo, *pats, **opts)