branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
# diffutil.py - utility functions related to diff and patch
#
# Copyright 2006 Brendan Cully <brendan@kublai.com>
# Copyright 2007 Chris Mason <chris.mason@oracle.com>
# Copyright 2018 Octobus <octobus@octobus.net>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import typing
from typing import (
Any,
Dict,
Optional,
)
from .i18n import _
from .node import nullrev
from . import (
mdiff,
pycompat,
)
if typing.TYPE_CHECKING:
from . import ui as uimod
# TODO: narrow the value after the config module is typed
_Opts = Dict[bytes, Any]
def diffallopts(
ui: "uimod.ui",
opts: Optional[_Opts] = None,
untrusted: bool = False,
section: bytes = b'diff',
configprefix: bytes = b'',
) -> mdiff.diffopts:
'''return diffopts with all features supported and parsed'''
return difffeatureopts(
ui,
opts=opts,
untrusted=untrusted,
section=section,
git=True,
whitespace=True,
formatchanging=True,
configprefix=configprefix,
)
def difffeatureopts(
ui: "uimod.ui",
opts: Optional[_Opts] = None,
untrusted: bool = False,
section: bytes = b'diff',
git: bool = False,
whitespace: bool = False,
formatchanging: bool = False,
configprefix: bytes = b'',
) -> mdiff.diffopts:
"""return diffopts with only opted-in features parsed
Features:
- git: git-style diffs
- whitespace: whitespace options like ignoreblanklines and ignorews
- formatchanging: options that will likely break or cause correctness issues
with most diff parsers
"""
def get(
key: bytes,
name: Optional[bytes] = None,
getter=ui.configbool,
forceplain: Optional[bool] = None,
) -> Any:
if opts:
v = opts.get(key)
# diffopts flags are either None-default (which is passed
# through unchanged, so we can identify unset values), or
# some other falsey default (eg --unified, which defaults
# to an empty string). We only want to override the config
# entries from hgrc with command line values if they
# appear to have been set, which is any truthy value,
# True, or False.
if v or isinstance(v, bool):
return v
if forceplain is not None and ui.plain():
return forceplain
return getter(
section, configprefix + (name or key), untrusted=untrusted
)
# core options, expected to be understood by every diff parser
buildopts = {
b'nodates': get(b'nodates'),
b'showfunc': get(b'show_function', b'showfunc'),
b'context': get(b'unified', getter=ui.config),
}
buildopts[b'xdiff'] = ui.configbool(b'experimental', b'xdiff')
if git:
buildopts[b'git'] = get(b'git')
# since this is in the experimental section, we need to call
# ui.configbool directory
buildopts[b'showsimilarity'] = ui.configbool(
b'experimental', b'extendedheader.similarity'
)
# need to inspect the ui object instead of using get() since we want to
# test for an int
hconf = ui.config(b'experimental', b'extendedheader.index')
if hconf is not None:
hlen = None
try:
# the hash config could be an integer (for length of hash) or a
# word (e.g. short, full, none)
hlen = int(hconf)
if hlen < 0 or hlen > 40:
msg = _(b"invalid length for extendedheader.index: '%d'\n")
ui.warn(msg % hlen)
except ValueError:
# default value
if hconf == b'short' or hconf == b'':
hlen = 12
elif hconf == b'full':
hlen = 40
elif hconf != b'none':
msg = _(b"invalid value for extendedheader.index: '%s'\n")
ui.warn(msg % hconf)
finally:
buildopts[b'index'] = hlen
if whitespace:
buildopts[b'ignorews'] = get(b'ignore_all_space', b'ignorews')
buildopts[b'ignorewsamount'] = get(
b'ignore_space_change', b'ignorewsamount'
)
buildopts[b'ignoreblanklines'] = get(
b'ignore_blank_lines', b'ignoreblanklines'
)
buildopts[b'ignorewseol'] = get(b'ignore_space_at_eol', b'ignorewseol')
if formatchanging:
buildopts[b'text'] = None if opts is None else opts.get(b'text')
binary = None if opts is None else opts.get(b'binary')
buildopts[b'nobinary'] = (
not binary
if binary is not None
else get(b'nobinary', forceplain=False)
)
buildopts[b'noprefix'] = get(b'noprefix', forceplain=False)
buildopts[b'worddiff'] = get(
b'word_diff', b'word-diff', forceplain=False
)
return mdiff.diffopts(**pycompat.strkwargs(buildopts))
def diff_parent(ctx):
"""get the context object to use as parent when diffing
If diff.merge is enabled, an overlayworkingctx of the auto-merged parents will be returned.
"""
repo = ctx.repo()
if repo.ui.configbool(b"diff", b"merge") and ctx.p2().rev() != nullrev:
# avoid circular import
from . import (
context,
merge,
)
wctx = context.overlayworkingctx(repo)
wctx.setbase(ctx.p1())
with repo.ui.configoverride(
{
(
b"ui",
b"forcemerge",
): b"internal:merge3-lie-about-conflicts",
},
b"merge-diff",
):
with repo.ui.silent():
merge.merge(ctx.p2(), wc=wctx)
return wctx
else:
return ctx.p1()