view mercurial/configitems.py @ 44950:f9734b2d59cc

py3: make stdout line-buffered if connected to a TTY

Status messages that are to be shown on the terminal should be written to the
file descriptor before anything further is done, to keep the user updated.

One common way to achieve this is to make stdout line-buffered if it is
connected to a TTY. This is done on Python 2 (except on Windows, where libc,
which the CPython 2 streams depend on, does not properly support this).

Python 3 rolls it own I/O streams. On Python 3, buffered binary streams can't be
set line-buffered. The previous code (added in 227ba1afcb65) incorrectly
assumed that on Python 3, pycompat.stdout (sys.stdout.buffer) is already
line-buffered. However the interpreter initializes it with a block-buffered
stream or an unbuffered stream (when the -u option or the PYTHONUNBUFFERED
environment variable is set), never with a line-buffered stream.

One example where the current behavior is unacceptable is when running
`hg pull https://www.mercurial-scm.org/repo/hg` on Python 3, where the line
"pulling from https://www.mercurial-scm.org/repo/hg" does not appear on the
terminal before the hg process blocks while waiting for the server.

Various approaches to fix this problem are possible, including:

1. Weaken the contract of procutil.stdout to not give any guarantees about
   buffering behavior. In this case, users of procutil.stdout need to be
   changed to do enough flushes. In particular,
  1. either ui must insert enough flushes for ui.write() and friends, or
  2. ui.write() and friends get split into flushing and fully buffered
     methods, or
  3. users of ui.write() and friends must flush explicitly.
2. Make stdout unbuffered.
3. Make stdout line-buffered. Since Python 3 does not natively support that for
   binary streams, we must implement it ourselves.

(2.) is problematic because using unbuffered I/O changes the performance
characteristics significantly compared to line-buffered (which is used on
Python 2) and this would be a regression.

(1.2.) and (1.3) are a substantial amount of work. It’s unclear whether the
added complexity would be justified, given that raw performance doesn’t matter
that much when writing to a terminal much faster than the user could read it.

(1.1.) pushes complexity into the ui class instead of separating the concern of
how stdout is buffered. Other users of procutil.stdout would still need to take
care of the flushes.

This patch implements (3.). The general performance considerations are very
similar to (1.1.). The extra method invocation and method forwarding add a
little more overhead if the class is used. In exchange, it doesn’t add overhead
if not used.


For the benchmarks, I compared the previous implementation (incorrect on Python
3), (1.1.), (3.) and (2.). The command was chosen so that the streams were
configured as if they were writing to a TTY, but actually write to a pager,
which is also the default:
HGRCPATH=/dev/null python3 ./hg --cwd ~/vcs/mozilla-central --time --pager yes --config pager.pager='cat > /dev/null' status --all

previous:
time: real 7.880 secs (user 7.290+0.050 sys 0.580+0.170)
time: real 7.830 secs (user 7.220+0.070 sys 0.590+0.140)
time: real 7.800 secs (user 7.210+0.050 sys 0.570+0.170)

(1.1.) using Yuya Nishihara’s patch:
time: real 9.860 secs (user 8.670+0.350 sys 1.160+0.830)
time: real 9.540 secs (user 8.430+0.370 sys 1.100+0.770)
time: real 9.830 secs (user 8.630+0.370 sys 1.180+0.840)

(3.) using this patch:
time: real 9.580 secs (user 8.480+0.350 sys 1.090+0.770)
time: real 9.670 secs (user 8.480+0.330 sys 1.170+0.860)
time: real 9.640 secs (user 8.500+0.350 sys 1.130+0.810)

(2.) using a previous patch by me:
time: real 10.480 secs (user 8.850+0.720 sys 1.590+1.500)
time: real 10.490 secs (user 8.750+0.750 sys 1.710+1.470)
time: real 10.240 secs (user 8.600+0.700 sys 1.590+1.510)


As expected, there’s no difference on Python 2, as exactly the same code paths
are used:

previous:
time: real 6.950 secs (user 5.870+0.330 sys 1.070+0.770)
time: real 7.040 secs (user 6.040+0.360 sys 0.980+0.750)
time: real 7.070 secs (user 5.950+0.360 sys 1.100+0.760)

this patch:
time: real 7.010 secs (user 5.900+0.390 sys 1.070+0.730)
time: real 7.000 secs (user 5.850+0.350 sys 1.120+0.760)
time: real 7.000 secs (user 5.790+0.380 sys 1.170+0.710)

# configitems.py - centralized declaration of configuration option
#
#  Copyright 2017 Pierre-Yves David <[e-mail]>
#
# 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

import functools
import re

from . import (
    encoding,
    error,
)


def loadconfigtable(ui, extname, configtable):
    """update config item known to the ui with the extension ones"""
    for section, items in sorted(configtable.items()):
        knownitems = ui._knownconfig.setdefault(section, itemregister())
        knownkeys = set(knownitems)
        newkeys = set(items)
        for key in sorted(knownkeys & newkeys):
            msg = b"extension '%s' overwrite config item '%s.%s'"
            msg %= (extname, section, key)
            ui.develwarn(msg, config=b'warn-config')

        knownitems.update(items)


class configitem(object):
    """represent a known config item

    :section: the official config section where to find this item,
       :name: the official name within the section,
    :default: default value for this item,
    :alias: optional list of tuples as alternatives,
    :generic: this is a generic definition, match name using regular expression.
    """

    def __init__(
        self,
        section,
        name,
        default=None,
        alias=(),
        generic=False,
        priority=0,
        experimental=False,
    ):
        self.section = section
        self.name = name
        self.default = default
        self.alias = list(alias)
        self.generic = generic
        self.priority = priority
        self.experimental = experimental
        self._re = None
        if generic:
            self._re = re.compile(self.name)


class itemregister(dict):
    """A specialized dictionary that can handle wild-card selection"""

    def __init__(self):
        super(itemregister, self).__init__()
        self._generics = set()

    def update(self, other):
        super(itemregister, self).update(other)
        self._generics.update(other._generics)

    def __setitem__(self, key, item):
        super(itemregister, self).__setitem__(key, item)
        if item.generic:
            self._generics.add(item)

    def get(self, key):
        baseitem = super(itemregister, self).get(key)
        if baseitem is not None and not baseitem.generic:
            return baseitem

        # search for a matching generic item
        generics = sorted(self._generics, key=(lambda x: (x.priority, x.name)))
        for item in generics:
            # we use 'match' instead of 'search' to make the matching simpler
            # for people unfamiliar with regular expression. Having the match
            # rooted to the start of the string will produce less surprising
            # result for user writing simple regex for sub-attribute.
            #
            # For example using "color\..*" match produces an unsurprising
            # result, while using search could suddenly match apparently
            # unrelated configuration that happens to contains "color."
            # anywhere. This is a tradeoff where we favor requiring ".*" on
            # some match to avoid the need to prefix most pattern with "^".
            # The "^" seems more error prone.
            if item._re.match(key):
                return item

        return None


coreitems = {}


def _register(configtable, *args, **kwargs):
    item = configitem(*args, **kwargs)
    section = configtable.setdefault(item.section, itemregister())
    if item.name in section:
        msg = b"duplicated config item registration for '%s.%s'"
        raise error.ProgrammingError(msg % (item.section, item.name))
    section[item.name] = item


# special value for case where the default is derived from other values
dynamicdefault = object()

# Registering actual config items


def getitemregister(configtable):
    f = functools.partial(_register, configtable)
    # export pseudo enum as configitem.*
    f.dynamicdefault = dynamicdefault
    return f


coreconfigitem = getitemregister(coreitems)


def _registerdiffopts(section, configprefix=b''):
    coreconfigitem(
        section, configprefix + b'nodates', default=False,
    )
    coreconfigitem(
        section, configprefix + b'showfunc', default=False,
    )
    coreconfigitem(
        section, configprefix + b'unified', default=None,
    )
    coreconfigitem(
        section, configprefix + b'git', default=False,
    )
    coreconfigitem(
        section, configprefix + b'ignorews', default=False,
    )
    coreconfigitem(
        section, configprefix + b'ignorewsamount', default=False,
    )
    coreconfigitem(
        section, configprefix + b'ignoreblanklines', default=False,
    )
    coreconfigitem(
        section, configprefix + b'ignorewseol', default=False,
    )
    coreconfigitem(
        section, configprefix + b'nobinary', default=False,
    )
    coreconfigitem(
        section, configprefix + b'noprefix', default=False,
    )
    coreconfigitem(
        section, configprefix + b'word-diff', default=False,
    )


coreconfigitem(
    b'alias', b'.*', default=dynamicdefault, generic=True,
)
coreconfigitem(
    b'auth', b'cookiefile', default=None,
)
_registerdiffopts(section=b'annotate')
# bookmarks.pushing: internal hack for discovery
coreconfigitem(
    b'bookmarks', b'pushing', default=list,
)
# bundle.mainreporoot: internal hack for bundlerepo
coreconfigitem(
    b'bundle', b'mainreporoot', default=b'',
)
coreconfigitem(
    b'censor', b'policy', default=b'abort', experimental=True,
)
coreconfigitem(
    b'chgserver', b'idletimeout', default=3600,
)
coreconfigitem(
    b'chgserver', b'skiphash', default=False,
)
coreconfigitem(
    b'cmdserver', b'log', default=None,
)
coreconfigitem(
    b'cmdserver', b'max-log-files', default=7,
)
coreconfigitem(
    b'cmdserver', b'max-log-size', default=b'1 MB',
)
coreconfigitem(
    b'cmdserver', b'max-repo-cache', default=0, experimental=True,
)
coreconfigitem(
    b'cmdserver', b'message-encodings', default=list, experimental=True,
)
coreconfigitem(
    b'cmdserver',
    b'track-log',
    default=lambda: [b'chgserver', b'cmdserver', b'repocache'],
)
coreconfigitem(
    b'color', b'.*', default=None, generic=True,
)
coreconfigitem(
    b'color', b'mode', default=b'auto',
)
coreconfigitem(
    b'color', b'pagermode', default=dynamicdefault,
)
_registerdiffopts(section=b'commands', configprefix=b'commit.interactive.')
coreconfigitem(
    b'commands', b'commit.post-status', default=False,
)
coreconfigitem(
    b'commands', b'grep.all-files', default=False, experimental=True,
)
coreconfigitem(
    b'commands', b'merge.require-rev', default=False,
)
coreconfigitem(
    b'commands', b'push.require-revs', default=False,
)
coreconfigitem(
    b'commands', b'resolve.confirm', default=False,
)
coreconfigitem(
    b'commands', b'resolve.explicit-re-merge', default=False,
)
coreconfigitem(
    b'commands', b'resolve.mark-check', default=b'none',
)
_registerdiffopts(section=b'commands', configprefix=b'revert.interactive.')
coreconfigitem(
    b'commands', b'show.aliasprefix', default=list,
)
coreconfigitem(
    b'commands', b'status.relative', default=False,
)
coreconfigitem(
    b'commands', b'status.skipstates', default=[], experimental=True,
)
coreconfigitem(
    b'commands', b'status.terse', default=b'',
)
coreconfigitem(
    b'commands', b'status.verbose', default=False,
)
coreconfigitem(
    b'commands', b'update.check', default=None,
)
coreconfigitem(
    b'commands', b'update.requiredest', default=False,
)
coreconfigitem(
    b'committemplate', b'.*', default=None, generic=True,
)
coreconfigitem(
    b'convert', b'bzr.saverev', default=True,
)
coreconfigitem(
    b'convert', b'cvsps.cache', default=True,
)
coreconfigitem(
    b'convert', b'cvsps.fuzz', default=60,
)
coreconfigitem(
    b'convert', b'cvsps.logencoding', default=None,
)
coreconfigitem(
    b'convert', b'cvsps.mergefrom', default=None,
)
coreconfigitem(
    b'convert', b'cvsps.mergeto', default=None,
)
coreconfigitem(
    b'convert', b'git.committeractions', default=lambda: [b'messagedifferent'],
)
coreconfigitem(
    b'convert', b'git.extrakeys', default=list,
)
coreconfigitem(
    b'convert', b'git.findcopiesharder', default=False,
)
coreconfigitem(
    b'convert', b'git.remoteprefix', default=b'remote',
)
coreconfigitem(
    b'convert', b'git.renamelimit', default=400,
)
coreconfigitem(
    b'convert', b'git.saverev', default=True,
)
coreconfigitem(
    b'convert', b'git.similarity', default=50,
)
coreconfigitem(
    b'convert', b'git.skipsubmodules', default=False,
)
coreconfigitem(
    b'convert', b'hg.clonebranches', default=False,
)
coreconfigitem(
    b'convert', b'hg.ignoreerrors', default=False,
)
coreconfigitem(
    b'convert', b'hg.preserve-hash', default=False,
)
coreconfigitem(
    b'convert', b'hg.revs', default=None,
)
coreconfigitem(
    b'convert', b'hg.saverev', default=False,
)
coreconfigitem(
    b'convert', b'hg.sourcename', default=None,
)
coreconfigitem(
    b'convert', b'hg.startrev', default=None,
)
coreconfigitem(
    b'convert', b'hg.tagsbranch', default=b'default',
)
coreconfigitem(
    b'convert', b'hg.usebranchnames', default=True,
)
coreconfigitem(
    b'convert', b'ignoreancestorcheck', default=False, experimental=True,
)
coreconfigitem(
    b'convert', b'localtimezone', default=False,
)
coreconfigitem(
    b'convert', b'p4.encoding', default=dynamicdefault,
)
coreconfigitem(
    b'convert', b'p4.startrev', default=0,
)
coreconfigitem(
    b'convert', b'skiptags', default=False,
)
coreconfigitem(
    b'convert', b'svn.debugsvnlog', default=True,
)
coreconfigitem(
    b'convert', b'svn.trunk', default=None,
)
coreconfigitem(
    b'convert', b'svn.tags', default=None,
)
coreconfigitem(
    b'convert', b'svn.branches', default=None,
)
coreconfigitem(
    b'convert', b'svn.startrev', default=0,
)
coreconfigitem(
    b'debug', b'dirstate.delaywrite', default=0,
)
coreconfigitem(
    b'defaults', b'.*', default=None, generic=True,
)
coreconfigitem(
    b'devel', b'all-warnings', default=False,
)
coreconfigitem(
    b'devel', b'bundle2.debug', default=False,
)
coreconfigitem(
    b'devel', b'bundle.delta', default=b'',
)
coreconfigitem(
    b'devel', b'cache-vfs', default=None,
)
coreconfigitem(
    b'devel', b'check-locks', default=False,
)
coreconfigitem(
    b'devel', b'check-relroot', default=False,
)
coreconfigitem(
    b'devel', b'default-date', default=None,
)
coreconfigitem(
    b'devel', b'deprec-warn', default=False,
)
coreconfigitem(
    b'devel', b'disableloaddefaultcerts', default=False,
)
coreconfigitem(
    b'devel', b'warn-empty-changegroup', default=False,
)
coreconfigitem(
    b'devel', b'legacy.exchange', default=list,
)
coreconfigitem(
    b'devel', b'persistent-nodemap', default=False,
)
coreconfigitem(
    b'devel', b'servercafile', default=b'',
)
coreconfigitem(
    b'devel', b'serverexactprotocol', default=b'',
)
coreconfigitem(
    b'devel', b'serverrequirecert', default=False,
)
coreconfigitem(
    b'devel', b'strip-obsmarkers', default=True,
)
coreconfigitem(
    b'devel', b'warn-config', default=None,
)
coreconfigitem(
    b'devel', b'warn-config-default', default=None,
)
coreconfigitem(
    b'devel', b'user.obsmarker', default=None,
)
coreconfigitem(
    b'devel', b'warn-config-unknown', default=None,
)
coreconfigitem(
    b'devel', b'debug.copies', default=False,
)
coreconfigitem(
    b'devel', b'debug.extensions', default=False,
)
coreconfigitem(
    b'devel', b'debug.repo-filters', default=False,
)
coreconfigitem(
    b'devel', b'debug.peer-request', default=False,
)
coreconfigitem(
    b'devel', b'discovery.randomize', default=True,
)
_registerdiffopts(section=b'diff')
coreconfigitem(
    b'email', b'bcc', default=None,
)
coreconfigitem(
    b'email', b'cc', default=None,
)
coreconfigitem(
    b'email', b'charsets', default=list,
)
coreconfigitem(
    b'email', b'from', default=None,
)
coreconfigitem(
    b'email', b'method', default=b'smtp',
)
coreconfigitem(
    b'email', b'reply-to', default=None,
)
coreconfigitem(
    b'email', b'to', default=None,
)
coreconfigitem(
    b'experimental', b'archivemetatemplate', default=dynamicdefault,
)
coreconfigitem(
    b'experimental', b'auto-publish', default=b'publish',
)
coreconfigitem(
    b'experimental', b'bundle-phases', default=False,
)
coreconfigitem(
    b'experimental', b'bundle2-advertise', default=True,
)
coreconfigitem(
    b'experimental', b'bundle2-output-capture', default=False,
)
coreconfigitem(
    b'experimental', b'bundle2.pushback', default=False,
)
coreconfigitem(
    b'experimental', b'bundle2lazylocking', default=False,
)
coreconfigitem(
    b'experimental', b'bundlecomplevel', default=None,
)
coreconfigitem(
    b'experimental', b'bundlecomplevel.bzip2', default=None,
)
coreconfigitem(
    b'experimental', b'bundlecomplevel.gzip', default=None,
)
coreconfigitem(
    b'experimental', b'bundlecomplevel.none', default=None,
)
coreconfigitem(
    b'experimental', b'bundlecomplevel.zstd', default=None,
)
coreconfigitem(
    b'experimental', b'changegroup3', default=False,
)
coreconfigitem(
    b'experimental', b'cleanup-as-archived', default=False,
)
coreconfigitem(
    b'experimental', b'clientcompressionengines', default=list,
)
coreconfigitem(
    b'experimental', b'copytrace', default=b'on',
)
coreconfigitem(
    b'experimental', b'copytrace.movecandidateslimit', default=100,
)
coreconfigitem(
    b'experimental', b'copytrace.sourcecommitlimit', default=100,
)
coreconfigitem(
    b'experimental', b'copies.read-from', default=b"filelog-only",
)
coreconfigitem(
    b'experimental', b'copies.write-to', default=b'filelog-only',
)
coreconfigitem(
    b'experimental', b'crecordtest', default=None,
)
coreconfigitem(
    b'experimental', b'directaccess', default=False,
)
coreconfigitem(
    b'experimental', b'directaccess.revnums', default=False,
)
coreconfigitem(
    b'experimental', b'editortmpinhg', default=False,
)
coreconfigitem(
    b'experimental', b'evolution', default=list,
)
coreconfigitem(
    b'experimental',
    b'evolution.allowdivergence',
    default=False,
    alias=[(b'experimental', b'allowdivergence')],
)
coreconfigitem(
    b'experimental', b'evolution.allowunstable', default=None,
)
coreconfigitem(
    b'experimental', b'evolution.createmarkers', default=None,
)
coreconfigitem(
    b'experimental',
    b'evolution.effect-flags',
    default=True,
    alias=[(b'experimental', b'effect-flags')],
)
coreconfigitem(
    b'experimental', b'evolution.exchange', default=None,
)
coreconfigitem(
    b'experimental', b'evolution.bundle-obsmarker', default=False,
)
coreconfigitem(
    b'experimental', b'log.topo', default=False,
)
coreconfigitem(
    b'experimental', b'evolution.report-instabilities', default=True,
)
coreconfigitem(
    b'experimental', b'evolution.track-operation', default=True,
)
# repo-level config to exclude a revset visibility
#
# The target use case is to use `share` to expose different subset of the same
# repository, especially server side. See also `server.view`.
coreconfigitem(
    b'experimental', b'extra-filter-revs', default=None,
)
coreconfigitem(
    b'experimental', b'maxdeltachainspan', default=-1,
)
coreconfigitem(
    b'experimental', b'mergetempdirprefix', default=None,
)
coreconfigitem(
    b'experimental', b'mmapindexthreshold', default=None,
)
coreconfigitem(
    b'experimental', b'narrow', default=False,
)
coreconfigitem(
    b'experimental', b'nonnormalparanoidcheck', default=False,
)
coreconfigitem(
    b'experimental', b'exportableenviron', default=list,
)
coreconfigitem(
    b'experimental', b'extendedheader.index', default=None,
)
coreconfigitem(
    b'experimental', b'extendedheader.similarity', default=False,
)
coreconfigitem(
    b'experimental', b'graphshorten', default=False,
)
coreconfigitem(
    b'experimental', b'graphstyle.parent', default=dynamicdefault,
)
coreconfigitem(
    b'experimental', b'graphstyle.missing', default=dynamicdefault,
)
coreconfigitem(
    b'experimental', b'graphstyle.grandparent', default=dynamicdefault,
)
coreconfigitem(
    b'experimental', b'hook-track-tags', default=False,
)
coreconfigitem(
    b'experimental', b'httppeer.advertise-v2', default=False,
)
coreconfigitem(
    b'experimental', b'httppeer.v2-encoder-order', default=None,
)
coreconfigitem(
    b'experimental', b'httppostargs', default=False,
)
coreconfigitem(
    b'experimental', b'mergedriver', default=None,
)
coreconfigitem(b'experimental', b'nointerrupt', default=False)
coreconfigitem(b'experimental', b'nointerrupt-interactiveonly', default=True)

coreconfigitem(
    b'experimental', b'obsmarkers-exchange-debug', default=False,
)
coreconfigitem(
    b'experimental', b'remotenames', default=False,
)
coreconfigitem(
    b'experimental', b'removeemptydirs', default=True,
)
coreconfigitem(
    b'experimental', b'revert.interactive.select-to-keep', default=False,
)
coreconfigitem(
    b'experimental', b'revisions.prefixhexnode', default=False,
)
coreconfigitem(
    b'experimental', b'revlogv2', default=None,
)
coreconfigitem(
    b'experimental', b'revisions.disambiguatewithin', default=None,
)
coreconfigitem(
    b'experimental', b'rust.index', default=False,
)
coreconfigitem(
    b'experimental', b'server.filesdata.recommended-batch-size', default=50000,
)
coreconfigitem(
    b'experimental',
    b'server.manifestdata.recommended-batch-size',
    default=100000,
)
coreconfigitem(
    b'experimental', b'server.stream-narrow-clones', default=False,
)
coreconfigitem(
    b'experimental', b'single-head-per-branch', default=False,
)
coreconfigitem(
    b'experimental',
    b'single-head-per-branch:account-closed-heads',
    default=False,
)
coreconfigitem(
    b'experimental', b'sshserver.support-v2', default=False,
)
coreconfigitem(
    b'experimental', b'sparse-read', default=False,
)
coreconfigitem(
    b'experimental', b'sparse-read.density-threshold', default=0.50,
)
coreconfigitem(
    b'experimental', b'sparse-read.min-gap-size', default=b'65K',
)
coreconfigitem(
    b'experimental', b'treemanifest', default=False,
)
coreconfigitem(
    b'experimental', b'update.atomic-file', default=False,
)
coreconfigitem(
    b'experimental', b'sshpeer.advertise-v2', default=False,
)
coreconfigitem(
    b'experimental', b'web.apiserver', default=False,
)
coreconfigitem(
    b'experimental', b'web.api.http-v2', default=False,
)
coreconfigitem(
    b'experimental', b'web.api.debugreflect', default=False,
)
coreconfigitem(
    b'experimental', b'worker.wdir-get-thread-safe', default=False,
)
coreconfigitem(
    b'experimental', b'worker.repository-upgrade', default=False,
)
coreconfigitem(
    b'experimental', b'xdiff', default=False,
)
coreconfigitem(
    b'extensions', b'.*', default=None, generic=True,
)
coreconfigitem(
    b'extdata', b'.*', default=None, generic=True,
)
coreconfigitem(
    b'format', b'bookmarks-in-store', default=False,
)
coreconfigitem(
    b'format', b'chunkcachesize', default=None, experimental=True,
)
coreconfigitem(
    b'format', b'dotencode', default=True,
)
coreconfigitem(
    b'format', b'generaldelta', default=False, experimental=True,
)
coreconfigitem(
    b'format', b'manifestcachesize', default=None, experimental=True,
)
coreconfigitem(
    b'format', b'maxchainlen', default=dynamicdefault, experimental=True,
)
coreconfigitem(
    b'format', b'obsstore-version', default=None,
)
coreconfigitem(
    b'format', b'sparse-revlog', default=True,
)
coreconfigitem(
    b'format',
    b'revlog-compression',
    default=lambda: [b'zlib'],
    alias=[(b'experimental', b'format.compression')],
)
coreconfigitem(
    b'format', b'usefncache', default=True,
)
coreconfigitem(
    b'format', b'usegeneraldelta', default=True,
)
coreconfigitem(
    b'format', b'usestore', default=True,
)
# Right now, the only efficient implement of the nodemap logic is in Rust, so
# the persistent nodemap feature needs to stay experimental as long as the Rust
# extensions are an experimental feature.
coreconfigitem(
    b'format', b'use-persistent-nodemap', default=False, experimental=True
)
coreconfigitem(
    b'format',
    b'exp-use-copies-side-data-changeset',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'format', b'exp-use-side-data', default=False, experimental=True,
)
coreconfigitem(
    b'format', b'internal-phase', default=False, experimental=True,
)
coreconfigitem(
    b'fsmonitor', b'warn_when_unused', default=True,
)
coreconfigitem(
    b'fsmonitor', b'warn_update_file_count', default=50000,
)
coreconfigitem(
    b'help', br'hidden-command\..*', default=False, generic=True,
)
coreconfigitem(
    b'help', br'hidden-topic\..*', default=False, generic=True,
)
coreconfigitem(
    b'hooks', b'.*', default=dynamicdefault, generic=True,
)
coreconfigitem(
    b'hgweb-paths', b'.*', default=list, generic=True,
)
coreconfigitem(
    b'hostfingerprints', b'.*', default=list, generic=True,
)
coreconfigitem(
    b'hostsecurity', b'ciphers', default=None,
)
coreconfigitem(
    b'hostsecurity', b'minimumprotocol', default=dynamicdefault,
)
coreconfigitem(
    b'hostsecurity',
    b'.*:minimumprotocol$',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem(
    b'hostsecurity', b'.*:ciphers$', default=dynamicdefault, generic=True,
)
coreconfigitem(
    b'hostsecurity', b'.*:fingerprints$', default=list, generic=True,
)
coreconfigitem(
    b'hostsecurity', b'.*:verifycertsfile$', default=None, generic=True,
)

coreconfigitem(
    b'http_proxy', b'always', default=False,
)
coreconfigitem(
    b'http_proxy', b'host', default=None,
)
coreconfigitem(
    b'http_proxy', b'no', default=list,
)
coreconfigitem(
    b'http_proxy', b'passwd', default=None,
)
coreconfigitem(
    b'http_proxy', b'user', default=None,
)

coreconfigitem(
    b'http', b'timeout', default=None,
)

coreconfigitem(
    b'logtoprocess', b'commandexception', default=None,
)
coreconfigitem(
    b'logtoprocess', b'commandfinish', default=None,
)
coreconfigitem(
    b'logtoprocess', b'command', default=None,
)
coreconfigitem(
    b'logtoprocess', b'develwarn', default=None,
)
coreconfigitem(
    b'logtoprocess', b'uiblocked', default=None,
)
coreconfigitem(
    b'merge', b'checkunknown', default=b'abort',
)
coreconfigitem(
    b'merge', b'checkignored', default=b'abort',
)
coreconfigitem(
    b'experimental', b'merge.checkpathconflicts', default=False,
)
coreconfigitem(
    b'merge', b'followcopies', default=True,
)
coreconfigitem(
    b'merge', b'on-failure', default=b'continue',
)
coreconfigitem(
    b'merge', b'preferancestor', default=lambda: [b'*'], experimental=True,
)
coreconfigitem(
    b'merge', b'strict-capability-check', default=False,
)
coreconfigitem(
    b'merge-tools', b'.*', default=None, generic=True,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.args$',
    default=b"$local $base $other",
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools', br'.*\.binary$', default=False, generic=True, priority=-1,
)
coreconfigitem(
    b'merge-tools', br'.*\.check$', default=list, generic=True, priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.checkchanged$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.executable$',
    default=dynamicdefault,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools', br'.*\.fixeol$', default=False, generic=True, priority=-1,
)
coreconfigitem(
    b'merge-tools', br'.*\.gui$', default=False, generic=True, priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.mergemarkers$',
    default=b'basic',
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.mergemarkertemplate$',
    default=dynamicdefault,  # take from ui.mergemarkertemplate
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools', br'.*\.priority$', default=0, generic=True, priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.premerge$',
    default=dynamicdefault,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools', br'.*\.symlink$', default=False, generic=True, priority=-1,
)
coreconfigitem(
    b'pager', b'attend-.*', default=dynamicdefault, generic=True,
)
coreconfigitem(
    b'pager', b'ignore', default=list,
)
coreconfigitem(
    b'pager', b'pager', default=dynamicdefault,
)
coreconfigitem(
    b'patch', b'eol', default=b'strict',
)
coreconfigitem(
    b'patch', b'fuzz', default=2,
)
coreconfigitem(
    b'paths', b'default', default=None,
)
coreconfigitem(
    b'paths', b'default-push', default=None,
)
coreconfigitem(
    b'paths', b'.*', default=None, generic=True,
)
coreconfigitem(
    b'phases', b'checksubrepos', default=b'follow',
)
coreconfigitem(
    b'phases', b'new-commit', default=b'draft',
)
coreconfigitem(
    b'phases', b'publish', default=True,
)
coreconfigitem(
    b'profiling', b'enabled', default=False,
)
coreconfigitem(
    b'profiling', b'format', default=b'text',
)
coreconfigitem(
    b'profiling', b'freq', default=1000,
)
coreconfigitem(
    b'profiling', b'limit', default=30,
)
coreconfigitem(
    b'profiling', b'nested', default=0,
)
coreconfigitem(
    b'profiling', b'output', default=None,
)
coreconfigitem(
    b'profiling', b'showmax', default=0.999,
)
coreconfigitem(
    b'profiling', b'showmin', default=dynamicdefault,
)
coreconfigitem(
    b'profiling', b'showtime', default=True,
)
coreconfigitem(
    b'profiling', b'sort', default=b'inlinetime',
)
coreconfigitem(
    b'profiling', b'statformat', default=b'hotpath',
)
coreconfigitem(
    b'profiling', b'time-track', default=dynamicdefault,
)
coreconfigitem(
    b'profiling', b'type', default=b'stat',
)
coreconfigitem(
    b'progress', b'assume-tty', default=False,
)
coreconfigitem(
    b'progress', b'changedelay', default=1,
)
coreconfigitem(
    b'progress', b'clear-complete', default=True,
)
coreconfigitem(
    b'progress', b'debug', default=False,
)
coreconfigitem(
    b'progress', b'delay', default=3,
)
coreconfigitem(
    b'progress', b'disable', default=False,
)
coreconfigitem(
    b'progress', b'estimateinterval', default=60.0,
)
coreconfigitem(
    b'progress',
    b'format',
    default=lambda: [b'topic', b'bar', b'number', b'estimate'],
)
coreconfigitem(
    b'progress', b'refresh', default=0.1,
)
coreconfigitem(
    b'progress', b'width', default=dynamicdefault,
)
coreconfigitem(
    b'pull', b'confirm', default=False,
)
coreconfigitem(
    b'push', b'pushvars.server', default=False,
)
coreconfigitem(
    b'rewrite',
    b'backup-bundle',
    default=True,
    alias=[(b'ui', b'history-editing-backup')],
)
coreconfigitem(
    b'rewrite', b'update-timestamp', default=False,
)
coreconfigitem(
    b'storage', b'new-repo-backend', default=b'revlogv1', experimental=True,
)
coreconfigitem(
    b'storage',
    b'revlog.optimize-delta-parent-choice',
    default=True,
    alias=[(b'format', b'aggressivemergedeltas')],
)
# experimental as long as rust is experimental (or a C version is implemented)
coreconfigitem(
    b'storage', b'revlog.nodemap.mmap', default=True, experimental=True
)
# experimental as long as format.use-persistent-nodemap is.
coreconfigitem(
    b'storage', b'revlog.nodemap.mode', default=b'compat', experimental=True
)
coreconfigitem(
    b'storage', b'revlog.reuse-external-delta', default=True,
)
coreconfigitem(
    b'storage', b'revlog.reuse-external-delta-parent', default=None,
)
coreconfigitem(
    b'storage', b'revlog.zlib.level', default=None,
)
coreconfigitem(
    b'storage', b'revlog.zstd.level', default=None,
)
coreconfigitem(
    b'server', b'bookmarks-pushkey-compat', default=True,
)
coreconfigitem(
    b'server', b'bundle1', default=True,
)
coreconfigitem(
    b'server', b'bundle1gd', default=None,
)
coreconfigitem(
    b'server', b'bundle1.pull', default=None,
)
coreconfigitem(
    b'server', b'bundle1gd.pull', default=None,
)
coreconfigitem(
    b'server', b'bundle1.push', default=None,
)
coreconfigitem(
    b'server', b'bundle1gd.push', default=None,
)
coreconfigitem(
    b'server',
    b'bundle2.stream',
    default=True,
    alias=[(b'experimental', b'bundle2.stream')],
)
coreconfigitem(
    b'server', b'compressionengines', default=list,
)
coreconfigitem(
    b'server', b'concurrent-push-mode', default=b'check-related',
)
coreconfigitem(
    b'server', b'disablefullbundle', default=False,
)
coreconfigitem(
    b'server', b'maxhttpheaderlen', default=1024,
)
coreconfigitem(
    b'server', b'pullbundle', default=False,
)
coreconfigitem(
    b'server', b'preferuncompressed', default=False,
)
coreconfigitem(
    b'server', b'streamunbundle', default=False,
)
coreconfigitem(
    b'server', b'uncompressed', default=True,
)
coreconfigitem(
    b'server', b'uncompressedallowsecret', default=False,
)
coreconfigitem(
    b'server', b'view', default=b'served',
)
coreconfigitem(
    b'server', b'validate', default=False,
)
coreconfigitem(
    b'server', b'zliblevel', default=-1,
)
coreconfigitem(
    b'server', b'zstdlevel', default=3,
)
coreconfigitem(
    b'share', b'pool', default=None,
)
coreconfigitem(
    b'share', b'poolnaming', default=b'identity',
)
coreconfigitem(
    b'shelve', b'maxbackups', default=10,
)
coreconfigitem(
    b'smtp', b'host', default=None,
)
coreconfigitem(
    b'smtp', b'local_hostname', default=None,
)
coreconfigitem(
    b'smtp', b'password', default=None,
)
coreconfigitem(
    b'smtp', b'port', default=dynamicdefault,
)
coreconfigitem(
    b'smtp', b'tls', default=b'none',
)
coreconfigitem(
    b'smtp', b'username', default=None,
)
coreconfigitem(
    b'sparse', b'missingwarning', default=True, experimental=True,
)
coreconfigitem(
    b'subrepos',
    b'allowed',
    default=dynamicdefault,  # to make backporting simpler
)
coreconfigitem(
    b'subrepos', b'hg:allowed', default=dynamicdefault,
)
coreconfigitem(
    b'subrepos', b'git:allowed', default=dynamicdefault,
)
coreconfigitem(
    b'subrepos', b'svn:allowed', default=dynamicdefault,
)
coreconfigitem(
    b'templates', b'.*', default=None, generic=True,
)
coreconfigitem(
    b'templateconfig', b'.*', default=dynamicdefault, generic=True,
)
coreconfigitem(
    b'trusted', b'groups', default=list,
)
coreconfigitem(
    b'trusted', b'users', default=list,
)
coreconfigitem(
    b'ui', b'_usedassubrepo', default=False,
)
coreconfigitem(
    b'ui', b'allowemptycommit', default=False,
)
coreconfigitem(
    b'ui', b'archivemeta', default=True,
)
coreconfigitem(
    b'ui', b'askusername', default=False,
)
coreconfigitem(
    b'ui', b'clonebundlefallback', default=False,
)
coreconfigitem(
    b'ui', b'clonebundleprefers', default=list,
)
coreconfigitem(
    b'ui', b'clonebundles', default=True,
)
coreconfigitem(
    b'ui', b'color', default=b'auto',
)
coreconfigitem(
    b'ui', b'commitsubrepos', default=False,
)
coreconfigitem(
    b'ui', b'debug', default=False,
)
coreconfigitem(
    b'ui', b'debugger', default=None,
)
coreconfigitem(
    b'ui', b'editor', default=dynamicdefault,
)
coreconfigitem(
    b'ui', b'fallbackencoding', default=None,
)
coreconfigitem(
    b'ui', b'forcecwd', default=None,
)
coreconfigitem(
    b'ui', b'forcemerge', default=None,
)
coreconfigitem(
    b'ui', b'formatdebug', default=False,
)
coreconfigitem(
    b'ui', b'formatjson', default=False,
)
coreconfigitem(
    b'ui', b'formatted', default=None,
)
coreconfigitem(
    b'ui', b'graphnodetemplate', default=None,
)
coreconfigitem(
    b'ui', b'interactive', default=None,
)
coreconfigitem(
    b'ui', b'interface', default=None,
)
coreconfigitem(
    b'ui', b'interface.chunkselector', default=None,
)
coreconfigitem(
    b'ui', b'large-file-limit', default=10000000,
)
coreconfigitem(
    b'ui', b'logblockedtimes', default=False,
)
coreconfigitem(
    b'ui', b'logtemplate', default=None,
)
coreconfigitem(
    b'ui', b'merge', default=None,
)
coreconfigitem(
    b'ui', b'mergemarkers', default=b'basic',
)
coreconfigitem(
    b'ui',
    b'mergemarkertemplate',
    default=(
        b'{node|short} '
        b'{ifeq(tags, "tip", "", '
        b'ifeq(tags, "", "", "{tags} "))}'
        b'{if(bookmarks, "{bookmarks} ")}'
        b'{ifeq(branch, "default", "", "{branch} ")}'
        b'- {author|user}: {desc|firstline}'
    ),
)
coreconfigitem(
    b'ui', b'message-output', default=b'stdio',
)
coreconfigitem(
    b'ui', b'nontty', default=False,
)
coreconfigitem(
    b'ui', b'origbackuppath', default=None,
)
coreconfigitem(
    b'ui', b'paginate', default=True,
)
coreconfigitem(
    b'ui', b'patch', default=None,
)
coreconfigitem(
    b'ui', b'pre-merge-tool-output-template', default=None,
)
coreconfigitem(
    b'ui', b'portablefilenames', default=b'warn',
)
coreconfigitem(
    b'ui', b'promptecho', default=False,
)
coreconfigitem(
    b'ui', b'quiet', default=False,
)
coreconfigitem(
    b'ui', b'quietbookmarkmove', default=False,
)
coreconfigitem(
    b'ui', b'relative-paths', default=b'legacy',
)
coreconfigitem(
    b'ui', b'remotecmd', default=b'hg',
)
coreconfigitem(
    b'ui', b'report_untrusted', default=True,
)
coreconfigitem(
    b'ui', b'rollback', default=True,
)
coreconfigitem(
    b'ui', b'signal-safe-lock', default=True,
)
coreconfigitem(
    b'ui', b'slash', default=False,
)
coreconfigitem(
    b'ui', b'ssh', default=b'ssh',
)
coreconfigitem(
    b'ui', b'ssherrorhint', default=None,
)
coreconfigitem(
    b'ui', b'statuscopies', default=False,
)
coreconfigitem(
    b'ui', b'strict', default=False,
)
coreconfigitem(
    b'ui', b'style', default=b'',
)
coreconfigitem(
    b'ui', b'supportcontact', default=None,
)
coreconfigitem(
    b'ui', b'textwidth', default=78,
)
coreconfigitem(
    b'ui', b'timeout', default=b'600',
)
coreconfigitem(
    b'ui', b'timeout.warn', default=0,
)
coreconfigitem(
    b'ui', b'traceback', default=False,
)
coreconfigitem(
    b'ui', b'tweakdefaults', default=False,
)
coreconfigitem(b'ui', b'username', alias=[(b'ui', b'user')])
coreconfigitem(
    b'ui', b'verbose', default=False,
)
coreconfigitem(
    b'verify', b'skipflags', default=None,
)
coreconfigitem(
    b'web', b'allowbz2', default=False,
)
coreconfigitem(
    b'web', b'allowgz', default=False,
)
coreconfigitem(
    b'web', b'allow-pull', alias=[(b'web', b'allowpull')], default=True,
)
coreconfigitem(
    b'web', b'allow-push', alias=[(b'web', b'allow_push')], default=list,
)
coreconfigitem(
    b'web', b'allowzip', default=False,
)
coreconfigitem(
    b'web', b'archivesubrepos', default=False,
)
coreconfigitem(
    b'web', b'cache', default=True,
)
coreconfigitem(
    b'web', b'comparisoncontext', default=5,
)
coreconfigitem(
    b'web', b'contact', default=None,
)
coreconfigitem(
    b'web', b'deny_push', default=list,
)
coreconfigitem(
    b'web', b'guessmime', default=False,
)
coreconfigitem(
    b'web', b'hidden', default=False,
)
coreconfigitem(
    b'web', b'labels', default=list,
)
coreconfigitem(
    b'web', b'logoimg', default=b'hglogo.png',
)
coreconfigitem(
    b'web', b'logourl', default=b'https://mercurial-scm.org/',
)
coreconfigitem(
    b'web', b'accesslog', default=b'-',
)
coreconfigitem(
    b'web', b'address', default=b'',
)
coreconfigitem(
    b'web', b'allow-archive', alias=[(b'web', b'allow_archive')], default=list,
)
coreconfigitem(
    b'web', b'allow_read', default=list,
)
coreconfigitem(
    b'web', b'baseurl', default=None,
)
coreconfigitem(
    b'web', b'cacerts', default=None,
)
coreconfigitem(
    b'web', b'certificate', default=None,
)
coreconfigitem(
    b'web', b'collapse', default=False,
)
coreconfigitem(
    b'web', b'csp', default=None,
)
coreconfigitem(
    b'web', b'deny_read', default=list,
)
coreconfigitem(
    b'web', b'descend', default=True,
)
coreconfigitem(
    b'web', b'description', default=b"",
)
coreconfigitem(
    b'web', b'encoding', default=lambda: encoding.encoding,
)
coreconfigitem(
    b'web', b'errorlog', default=b'-',
)
coreconfigitem(
    b'web', b'ipv6', default=False,
)
coreconfigitem(
    b'web', b'maxchanges', default=10,
)
coreconfigitem(
    b'web', b'maxfiles', default=10,
)
coreconfigitem(
    b'web', b'maxshortchanges', default=60,
)
coreconfigitem(
    b'web', b'motd', default=b'',
)
coreconfigitem(
    b'web', b'name', default=dynamicdefault,
)
coreconfigitem(
    b'web', b'port', default=8000,
)
coreconfigitem(
    b'web', b'prefix', default=b'',
)
coreconfigitem(
    b'web', b'push_ssl', default=True,
)
coreconfigitem(
    b'web', b'refreshinterval', default=20,
)
coreconfigitem(
    b'web', b'server-header', default=None,
)
coreconfigitem(
    b'web', b'static', default=None,
)
coreconfigitem(
    b'web', b'staticurl', default=None,
)
coreconfigitem(
    b'web', b'stripes', default=1,
)
coreconfigitem(
    b'web', b'style', default=b'paper',
)
coreconfigitem(
    b'web', b'templates', default=None,
)
coreconfigitem(
    b'web', b'view', default=b'served', experimental=True,
)
coreconfigitem(
    b'worker', b'backgroundclose', default=dynamicdefault,
)
# Windows defaults to a limit of 512 open files. A buffer of 128
# should give us enough headway.
coreconfigitem(
    b'worker', b'backgroundclosemaxqueue', default=384,
)
coreconfigitem(
    b'worker', b'backgroundcloseminfilecount', default=2048,
)
coreconfigitem(
    b'worker', b'backgroundclosethreadcount', default=4,
)
coreconfigitem(
    b'worker', b'enabled', default=True,
)
coreconfigitem(
    b'worker', b'numcpus', default=None,
)

# Rebase related configuration moved to core because other extension are doing
# strange things. For example, shelve import the extensions to reuse some bit
# without formally loading it.
coreconfigitem(
    b'commands', b'rebase.requiredest', default=False,
)
coreconfigitem(
    b'experimental', b'rebaseskipobsolete', default=True,
)
coreconfigitem(
    b'rebase', b'singletransaction', default=False,
)
coreconfigitem(
    b'rebase', b'experimental.inmemory', default=False,
)