help: add a mechanism to change flags' help depending on config

It seems reasonable to have a similar mechanism for the rest of the
help, but no such thing is implemented.

The goal is to make the help of commands clearer in the presence of
significant default changes, like tweakdefaults or with company-wide
hgrcs. In these cases, a user looking at the help of a command doesn't
exactly know what his hgrc is doing.

Apply to this to the --git option of commands that display diffs, as
this option in particular causes confusion for some reason.

Differential Revision: https://phab.mercurial-scm.org/D8100

mercurial/cmdutil.py

@@ -1,4065 +1,4065 b''
 # cmdutil.py - help for command processing in mercurial
 #
 # Copyright 2005-2007 Matt Mackall <[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 copy as copymod
 import errno
 import os
 import re
 
 from .i18n import _
 from .node import (
     hex,
     nullid,
     nullrev,
     short,
 )
 from .pycompat import (
     getattr,
     open,
     setattr,
 )
 from .thirdparty import attr
 
 from . import (
     bookmarks,
     changelog,
     copies,
     crecord as crecordmod,
     dirstateguard,
     encoding,
     error,
     formatter,
     logcmdutil,
     match as matchmod,
     merge as mergemod,
     mergeutil,
     obsolete,
     patch,
     pathutil,
     phases,
     pycompat,
     repair,
     revlog,
     rewriteutil,
     scmutil,
     smartset,
     state as statemod,
     subrepoutil,
     templatekw,
     templater,
     util,
     vfs as vfsmod,
 )
 
 from .utils import (
     dateutil,
     stringutil,
 )
 
 if pycompat.TYPE_CHECKING:
     from typing import (
         Any,
         Dict,
     )
 
     for t in (Any, Dict):
         assert t
 
 stringio = util.stringio
 
 # templates of common command options
 
 dryrunopts = [
     (b'n', b'dry-run', None, _(b'do not perform actions, just print output')),
 ]
 
 confirmopts = [
     (b'', b'confirm', None, _(b'ask before applying actions')),
 ]
 
 remoteopts = [
     (b'e', b'ssh', b'', _(b'specify ssh command to use'), _(b'CMD')),
     (
         b'',
         b'remotecmd',
         b'',
         _(b'specify hg command to run on the remote side'),
         _(b'CMD'),
     ),
     (
         b'',
         b'insecure',
         None,
         _(b'do not verify server certificate (ignoring web.cacerts config)'),
     ),
 ]
 
 walkopts = [
     (
         b'I',
         b'include',
         [],
         _(b'include names matching the given patterns'),
         _(b'PATTERN'),
     ),
     (
         b'X',
         b'exclude',
         [],
         _(b'exclude names matching the given patterns'),
         _(b'PATTERN'),
     ),
 ]
 
 commitopts = [
     (b'm', b'message', b'', _(b'use text as commit message'), _(b'TEXT')),
     (b'l', b'logfile', b'', _(b'read commit message from file'), _(b'FILE')),
 ]
 
 commitopts2 = [
     (
         b'd',
         b'date',
         b'',
         _(b'record the specified date as commit date'),
         _(b'DATE'),
     ),
     (
         b'u',
         b'user',
         b'',
         _(b'record the specified user as committer'),
         _(b'USER'),
     ),
 ]
 
 commitopts3 = [
     (b'D', b'currentdate', None, _(b'record the current date as commit date')),
     (b'U', b'currentuser', None, _(b'record the current user as committer')),
 ]
 
 formatteropts = [
     (b'T', b'template', b'', _(b'display with template'), _(b'TEMPLATE')),
 ]
 
 templateopts = [
     (
         b'',
         b'style',
         b'',
         _(b'display using template map file (DEPRECATED)'),
         _(b'STYLE'),
     ),
     (b'T', b'template', b'', _(b'display with template'), _(b'TEMPLATE')),
 ]
 
 logopts = [
     (b'p', b'patch', None, _(b'show patch')),
     (b'g', b'git', None, _(b'use git extended diff format')),
     (b'l', b'limit', b'', _(b'limit number of changes displayed'), _(b'NUM')),
     (b'M', b'no-merges', None, _(b'do not show merges')),
     (b'', b'stat', None, _(b'output diffstat-style summary of changes')),
     (b'G', b'graph', None, _(b"show the revision DAG")),
 ] + templateopts
 
 diffopts = [
     (b'a', b'text', None, _(b'treat all files as text')),
-    (b'g', b'git', None, _(b'use git extended diff format')),
+    (b'g', b'git', None, _(b'use git extended diff format (DEFAULT: diff.git)')),
     (b'', b'binary', None, _(b'generate binary diffs in git mode (default)')),
     (b'', b'nodates', None, _(b'omit dates from diff headers')),
 ]
 
 diffwsopts = [
     (
         b'w',
         b'ignore-all-space',
         None,
         _(b'ignore white space when comparing lines'),
     ),
     (
         b'b',
         b'ignore-space-change',
         None,
         _(b'ignore changes in the amount of white space'),
     ),
     (
         b'B',
         b'ignore-blank-lines',
         None,
         _(b'ignore changes whose lines are all blank'),
     ),
     (
         b'Z',
         b'ignore-space-at-eol',
         None,
         _(b'ignore changes in whitespace at EOL'),
     ),
 ]
 
 diffopts2 = (
     [
         (b'', b'noprefix', None, _(b'omit a/ and b/ prefixes from filenames')),
         (
             b'p',
             b'show-function',
             None,
             _(b'show which function each change is in'),
         ),
         (b'', b'reverse', None, _(b'produce a diff that undoes the changes')),
     ]
     + diffwsopts
     + [
         (
             b'U',
             b'unified',
             b'',
             _(b'number of lines of context to show'),
             _(b'NUM'),
         ),
         (b'', b'stat', None, _(b'output diffstat-style summary of changes')),
         (
             b'',
             b'root',
             b'',
             _(b'produce diffs relative to subdirectory'),
             _(b'DIR'),
         ),
     ]
 )
 
 mergetoolopts = [
     (b't', b'tool', b'', _(b'specify merge tool'), _(b'TOOL')),
 ]
 
 similarityopts = [
     (
         b's',
         b'similarity',
         b'',
         _(b'guess renamed files by similarity (0<=s<=100)'),
         _(b'SIMILARITY'),
     )
 ]
 
 subrepoopts = [(b'S', b'subrepos', None, _(b'recurse into subrepositories'))]
 
 debugrevlogopts = [
     (b'c', b'changelog', False, _(b'open changelog')),
     (b'm', b'manifest', False, _(b'open manifest')),
     (b'', b'dir', b'', _(b'open directory manifest')),
 ]
 
 # special string such that everything below this line will be ingored in the
 # editor text
 _linebelow = b"^HG: ------------------------ >8 ------------------------$"
 
 
 def check_at_most_one_arg(opts, *args):
     """abort if more than one of the arguments are in opts
 
     Returns the unique argument or None if none of them were specified.
     """
 
     def to_display(name):
         return pycompat.sysbytes(name).replace(b'_', b'-')
 
     previous = None
     for x in args:
         if opts.get(x):
             if previous:
                 raise error.Abort(
                     _(b'cannot specify both --%s and --%s')
                     % (to_display(previous), to_display(x))
                 )
             previous = x
     return previous
 
 
 def check_incompatible_arguments(opts, first, others):
     """abort if the first argument is given along with any of the others
 
     Unlike check_at_most_one_arg(), `others` are not mutually exclusive
     among themselves, and they're passed as a single collection.
     """
     for other in others:
         check_at_most_one_arg(opts, first, other)
 
 
 def resolvecommitoptions(ui, opts):
     """modify commit options dict to handle related options
 
     The return value indicates that ``rewrite.update-timestamp`` is the reason
     the ``date`` option is set.
     """
     check_at_most_one_arg(opts, b'date', b'currentdate')
     check_at_most_one_arg(opts, b'user', b'currentuser')
 
     datemaydiffer = False  # date-only change should be ignored?
 
     if opts.get(b'currentdate'):
         opts[b'date'] = b'%d %d' % dateutil.makedate()
     elif (
         not opts.get(b'date')
         and ui.configbool(b'rewrite', b'update-timestamp')
         and opts.get(b'currentdate') is None
     ):
         opts[b'date'] = b'%d %d' % dateutil.makedate()
         datemaydiffer = True
 
     if opts.get(b'currentuser'):
         opts[b'user'] = ui.username()
 
     return datemaydiffer
 
 
 def checknotesize(ui, opts):
     """ make sure note is of valid format """
 
     note = opts.get(b'note')
     if not note:
         return
 
     if len(note) > 255:
         raise error.Abort(_(b"cannot store a note of more than 255 bytes"))
     if b'\n' in note:
         raise error.Abort(_(b"note cannot contain a newline"))
 
 
 def ishunk(x):
     hunkclasses = (crecordmod.uihunk, patch.recordhunk)
     return isinstance(x, hunkclasses)
 
 
 def newandmodified(chunks, originalchunks):
     newlyaddedandmodifiedfiles = set()
     alsorestore = set()
     for chunk in chunks:
         if (
             ishunk(chunk)
             and chunk.header.isnewfile()
             and chunk not in originalchunks
         ):
             newlyaddedandmodifiedfiles.add(chunk.header.filename())
             alsorestore.update(
                 set(chunk.header.files()) - {chunk.header.filename()}
             )
     return newlyaddedandmodifiedfiles, alsorestore
 
 
 def parsealiases(cmd):
     return cmd.split(b"|")
 
 
 def setupwrapcolorwrite(ui):
     # wrap ui.write so diff output can be labeled/colorized
     def wrapwrite(orig, *args, **kw):
         label = kw.pop('label', b'')
         for chunk, l in patch.difflabel(lambda: args):
             orig(chunk, label=label + l)
 
     oldwrite = ui.write
 
     def wrap(*args, **kwargs):
         return wrapwrite(oldwrite, *args, **kwargs)
 
     setattr(ui, 'write', wrap)
     return oldwrite
 
 
 def filterchunks(ui, originalhunks, usecurses, testfile, match, operation=None):
     try:
         if usecurses:
             if testfile:
                 recordfn = crecordmod.testdecorator(
                     testfile, crecordmod.testchunkselector
                 )
             else:
                 recordfn = crecordmod.chunkselector
 
             return crecordmod.filterpatch(
                 ui, originalhunks, recordfn, operation
             )
     except crecordmod.fallbackerror as e:
         ui.warn(b'%s\n' % e)
         ui.warn(_(b'falling back to text mode\n'))
 
     return patch.filterpatch(ui, originalhunks, match, operation)
 
 
 def recordfilter(ui, originalhunks, match, operation=None):
     """ Prompts the user to filter the originalhunks and return a list of
     selected hunks.
     *operation* is used for to build ui messages to indicate the user what
     kind of filtering they are doing: reverting, committing, shelving, etc.
     (see patch.filterpatch).
     """
     usecurses = crecordmod.checkcurses(ui)
     testfile = ui.config(b'experimental', b'crecordtest')
     oldwrite = setupwrapcolorwrite(ui)
     try:
         newchunks, newopts = filterchunks(
             ui, originalhunks, usecurses, testfile, match, operation
         )
     finally:
         ui.write = oldwrite
     return newchunks, newopts
 
 
 def dorecord(
     ui, repo, commitfunc, cmdsuggest, backupall, filterfn, *pats, **opts
 ):
     opts = pycompat.byteskwargs(opts)
     if not ui.interactive():
         if cmdsuggest:
             msg = _(b'running non-interactively, use %s instead') % cmdsuggest
         else:
             msg = _(b'running non-interactively')
         raise error.Abort(msg)
 
     # make sure username is set before going interactive
     if not opts.get(b'user'):
         ui.username()  # raise exception, username not provided
 
     def recordfunc(ui, repo, message, match, opts):
         """This is generic record driver.
 
         Its job is to interactively filter local changes, and
         accordingly prepare working directory into a state in which the
         job can be delegated to a non-interactive commit command such as
         'commit' or 'qrefresh'.
 
         After the actual job is done by non-interactive command, the
         working directory is restored to its original state.
 
         In the end we'll record interesting changes, and everything else
         will be left in place, so the user can continue working.
         """
         if not opts.get(b'interactive-unshelve'):
             checkunfinished(repo, commit=True)
         wctx = repo[None]
         merge = len(wctx.parents()) > 1
         if merge:
             raise error.Abort(
                 _(
                     b'cannot partially commit a merge '
                     b'(use "hg commit" instead)'
                 )
             )
 
         def fail(f, msg):
             raise error.Abort(b'%s: %s' % (f, msg))
 
         force = opts.get(b'force')
         if not force:
             match = matchmod.badmatch(match, fail)
 
         status = repo.status(match=match)
 
         overrides = {(b'ui', b'commitsubrepos'): True}
 
         with repo.ui.configoverride(overrides, b'record'):
             # subrepoutil.precommit() modifies the status
             tmpstatus = scmutil.status(
                 copymod.copy(status.modified),
                 copymod.copy(status.added),
                 copymod.copy(status.removed),
                 copymod.copy(status.deleted),
                 copymod.copy(status.unknown),
                 copymod.copy(status.ignored),
                 copymod.copy(status.clean),  # pytype: disable=wrong-arg-count
             )
 
             # Force allows -X subrepo to skip the subrepo.
             subs, commitsubs, newstate = subrepoutil.precommit(
                 repo.ui, wctx, tmpstatus, match, force=True
             )
             for s in subs:
                 if s in commitsubs:
                     dirtyreason = wctx.sub(s).dirtyreason(True)
                     raise error.Abort(dirtyreason)
 
         if not force:
             repo.checkcommitpatterns(wctx, match, status, fail)
         diffopts = patch.difffeatureopts(
             ui,
             opts=opts,
             whitespace=True,
             section=b'commands',
             configprefix=b'commit.interactive.',
         )
         diffopts.nodates = True
         diffopts.git = True
         diffopts.showfunc = True
         originaldiff = patch.diff(repo, changes=status, opts=diffopts)
         originalchunks = patch.parsepatch(originaldiff)
         match = scmutil.match(repo[None], pats)
 
         # 1. filter patch, since we are intending to apply subset of it
         try:
             chunks, newopts = filterfn(ui, originalchunks, match)
         except error.PatchError as err:
             raise error.Abort(_(b'error parsing patch: %s') % err)
         opts.update(newopts)
 
         # We need to keep a backup of files that have been newly added and
         # modified during the recording process because there is a previous
         # version without the edit in the workdir. We also will need to restore
         # files that were the sources of renames so that the patch application
         # works.
         newlyaddedandmodifiedfiles, alsorestore = newandmodified(
             chunks, originalchunks
         )
         contenders = set()
         for h in chunks:
             try:
                 contenders.update(set(h.files()))
             except AttributeError:
                 pass
 
         changed = status.modified + status.added + status.removed
         newfiles = [f for f in changed if f in contenders]
         if not newfiles:
             ui.status(_(b'no changes to record\n'))
             return 0
 
         modified = set(status.modified)
 
         # 2. backup changed files, so we can restore them in the end
 
         if backupall:
             tobackup = changed
         else:
             tobackup = [
                 f
                 for f in newfiles
                 if f in modified or f in newlyaddedandmodifiedfiles
             ]
         backups = {}
         if tobackup:
             backupdir = repo.vfs.join(b'record-backups')
             try:
                 os.mkdir(backupdir)
             except OSError as err:
                 if err.errno != errno.EEXIST:
                     raise
         try:
             # backup continues
             for f in tobackup:
                 fd, tmpname = pycompat.mkstemp(
                     prefix=f.replace(b'/', b'_') + b'.', dir=backupdir
                 )
                 os.close(fd)
                 ui.debug(b'backup %r as %r\n' % (f, tmpname))
                 util.copyfile(repo.wjoin(f), tmpname, copystat=True)
                 backups[f] = tmpname
 
             fp = stringio()
             for c in chunks:
                 fname = c.filename()
                 if fname in backups:
                     c.write(fp)
             dopatch = fp.tell()
             fp.seek(0)
 
             # 2.5 optionally review / modify patch in text editor
             if opts.get(b'review', False):
                 patchtext = (
                     crecordmod.diffhelptext
                     + crecordmod.patchhelptext
                     + fp.read()
                 )
                 reviewedpatch = ui.edit(
                     patchtext, b"", action=b"diff", repopath=repo.path
                 )
                 fp.truncate(0)
                 fp.write(reviewedpatch)
                 fp.seek(0)
 
             [os.unlink(repo.wjoin(c)) for c in newlyaddedandmodifiedfiles]
             # 3a. apply filtered patch to clean repo  (clean)
             if backups:
                 m = scmutil.matchfiles(repo, set(backups.keys()) | alsorestore)
                 mergemod.revert_to(repo[b'.'], matcher=m)
 
             # 3b. (apply)
             if dopatch:
                 try:
                     ui.debug(b'applying patch\n')
                     ui.debug(fp.getvalue())
                     patch.internalpatch(ui, repo, fp, 1, eolmode=None)
                 except error.PatchError as err:
                     raise error.Abort(pycompat.bytestr(err))
             del fp
 
             # 4. We prepared working directory according to filtered
             #    patch. Now is the time to delegate the job to
             #    commit/qrefresh or the like!
 
             # Make all of the pathnames absolute.
             newfiles = [repo.wjoin(nf) for nf in newfiles]
             return commitfunc(ui, repo, *newfiles, **pycompat.strkwargs(opts))
         finally:
             # 5. finally restore backed-up files
             try:
                 dirstate = repo.dirstate
                 for realname, tmpname in pycompat.iteritems(backups):
                     ui.debug(b'restoring %r to %r\n' % (tmpname, realname))
 
                     if dirstate[realname] == b'n':
                         # without normallookup, restoring timestamp
                         # may cause partially committed files
                         # to be treated as unmodified
                         dirstate.normallookup(realname)
 
                     # copystat=True here and above are a hack to trick any
                     # editors that have f open that we haven't modified them.
                     #
                     # Also note that this racy as an editor could notice the
                     # file's mtime before we've finished writing it.
                     util.copyfile(tmpname, repo.wjoin(realname), copystat=True)
                     os.unlink(tmpname)
                 if tobackup:
                     os.rmdir(backupdir)
             except OSError:
                 pass
 
     def recordinwlock(ui, repo, message, match, opts):
         with repo.wlock():
             return recordfunc(ui, repo, message, match, opts)
 
     return commit(ui, repo, recordinwlock, pats, opts)
 
 
 class dirnode(object):
     """
     Represent a directory in user working copy with information required for
     the purpose of tersing its status.
 
     path is the path to the directory, without a trailing '/'
 
     statuses is a set of statuses of all files in this directory (this includes
     all the files in all the subdirectories too)
 
     files is a list of files which are direct child of this directory
 
     subdirs is a dictionary of sub-directory name as the key and it's own
     dirnode object as the value
     """
 
     def __init__(self, dirpath):
         self.path = dirpath
         self.statuses = set()
         self.files = []
         self.subdirs = {}
 
     def _addfileindir(self, filename, status):
         """Add a file in this directory as a direct child."""
         self.files.append((filename, status))
 
     def addfile(self, filename, status):
         """
         Add a file to this directory or to its direct parent directory.
 
         If the file is not direct child of this directory, we traverse to the
         directory of which this file is a direct child of and add the file
         there.
         """
 
         # the filename contains a path separator, it means it's not the direct
         # child of this directory
         if b'/' in filename:
             subdir, filep = filename.split(b'/', 1)
 
             # does the dirnode object for subdir exists
             if subdir not in self.subdirs:
                 subdirpath = pathutil.join(self.path, subdir)
                 self.subdirs[subdir] = dirnode(subdirpath)
 
             # try adding the file in subdir
             self.subdirs[subdir].addfile(filep, status)
 
         else:
             self._addfileindir(filename, status)
 
         if status not in self.statuses:
             self.statuses.add(status)
 
     def iterfilepaths(self):
         """Yield (status, path) for files directly under this directory."""
         for f, st in self.files:
             yield st, pathutil.join(self.path, f)
 
     def tersewalk(self, terseargs):
         """
         Yield (status, path) obtained by processing the status of this
         dirnode.
 
         terseargs is the string of arguments passed by the user with `--terse`
         flag.
 
         Following are the cases which can happen:
 
         1) All the files in the directory (including all the files in its
         subdirectories) share the same status and the user has asked us to terse
         that status. -> yield (status, dirpath).  dirpath will end in '/'.
 
         2) Otherwise, we do following:
 
                 a) Yield (status, filepath)  for all the files which are in this
                     directory (only the ones in this directory, not the subdirs)
 
                 b) Recurse the function on all the subdirectories of this
                    directory
         """
 
         if len(self.statuses) == 1:
             onlyst = self.statuses.pop()
 
             # Making sure we terse only when the status abbreviation is
             # passed as terse argument
             if onlyst in terseargs:
                 yield onlyst, self.path + b'/'
                 return
 
         # add the files to status list
         for st, fpath in self.iterfilepaths():
             yield st, fpath
 
         # recurse on the subdirs
         for dirobj in self.subdirs.values():
             for st, fpath in dirobj.tersewalk(terseargs):
                 yield st, fpath
 
 
 def tersedir(statuslist, terseargs):
     """
     Terse the status if all the files in a directory shares the same status.
 
     statuslist is scmutil.status() object which contains a list of files for
     each status.
     terseargs is string which is passed by the user as the argument to `--terse`
     flag.
 
     The function makes a tree of objects of dirnode class, and at each node it
     stores the information required to know whether we can terse a certain
     directory or not.
     """
     # the order matters here as that is used to produce final list
     allst = (b'm', b'a', b'r', b'd', b'u', b'i', b'c')
 
     # checking the argument validity
     for s in pycompat.bytestr(terseargs):
         if s not in allst:
             raise error.Abort(_(b"'%s' not recognized") % s)
 
     # creating a dirnode object for the root of the repo
     rootobj = dirnode(b'')
     pstatus = (
         b'modified',
         b'added',
         b'deleted',
         b'clean',
         b'unknown',
         b'ignored',
         b'removed',
     )
 
     tersedict = {}
     for attrname in pstatus:
         statuschar = attrname[0:1]
         for f in getattr(statuslist, attrname):
             rootobj.addfile(f, statuschar)
         tersedict[statuschar] = []
 
     # we won't be tersing the root dir, so add files in it
     for st, fpath in rootobj.iterfilepaths():
         tersedict[st].append(fpath)
 
     # process each sub-directory and build tersedict
     for subdir in rootobj.subdirs.values():
         for st, f in subdir.tersewalk(terseargs):
             tersedict[st].append(f)
 
     tersedlist = []
     for st in allst:
         tersedict[st].sort()
         tersedlist.append(tersedict[st])
 
     return scmutil.status(*tersedlist)
 
 
 def _commentlines(raw):
     '''Surround lineswith a comment char and a new line'''
     lines = raw.splitlines()
     commentedlines = [b'# %s' % line for line in lines]
     return b'\n'.join(commentedlines) + b'\n'
 
 
 @attr.s(frozen=True)
 class morestatus(object):
     reporoot = attr.ib()
     unfinishedop = attr.ib()
     unfinishedmsg = attr.ib()
     activemerge = attr.ib()
     unresolvedpaths = attr.ib()
     _formattedpaths = attr.ib(init=False, default=set())
     _label = b'status.morestatus'
 
     def formatfile(self, path, fm):
         self._formattedpaths.add(path)
         if self.activemerge and path in self.unresolvedpaths:
             fm.data(unresolved=True)
 
     def formatfooter(self, fm):
         if self.unfinishedop or self.unfinishedmsg:
             fm.startitem()
             fm.data(itemtype=b'morestatus')
 
         if self.unfinishedop:
             fm.data(unfinished=self.unfinishedop)
             statemsg = (
                 _(b'The repository is in an unfinished *%s* state.')
                 % self.unfinishedop
             )
             fm.plain(b'%s\n' % _commentlines(statemsg), label=self._label)
         if self.unfinishedmsg:
             fm.data(unfinishedmsg=self.unfinishedmsg)
 
         # May also start new data items.
         self._formatconflicts(fm)
 
         if self.unfinishedmsg:
             fm.plain(
                 b'%s\n' % _commentlines(self.unfinishedmsg), label=self._label
             )
 
     def _formatconflicts(self, fm):
         if not self.activemerge:
             return
 
         if self.unresolvedpaths:
             mergeliststr = b'\n'.join(
                 [
                     b'    %s'
                     % util.pathto(self.reporoot, encoding.getcwd(), path)
                     for path in self.unresolvedpaths
                 ]
             )
             msg = (
                 _(
                     '''Unresolved merge conflicts:
 
 %s
 
 To mark files as resolved:  hg resolve --mark FILE'''
                 )
                 % mergeliststr
             )
 
             # If any paths with unresolved conflicts were not previously
             # formatted, output them now.
             for f in self.unresolvedpaths:
                 if f in self._formattedpaths:
                     # Already output.
                     continue
                 fm.startitem()
                 # We can't claim to know the status of the file - it may just
                 # have been in one of the states that were not requested for
                 # display, so it could be anything.
                 fm.data(itemtype=b'file', path=f, unresolved=True)
 
         else:
             msg = _(b'No unresolved merge conflicts.')
 
         fm.plain(b'%s\n' % _commentlines(msg), label=self._label)
 
 
 def readmorestatus(repo):
     """Returns a morestatus object if the repo has unfinished state."""
     statetuple = statemod.getrepostate(repo)
     mergestate = mergemod.mergestate.read(repo)
     activemerge = mergestate.active()
     if not statetuple and not activemerge:
         return None
 
     unfinishedop = unfinishedmsg = unresolved = None
     if statetuple:
         unfinishedop, unfinishedmsg = statetuple
     if activemerge:
         unresolved = sorted(mergestate.unresolved())
     return morestatus(
         repo.root, unfinishedop, unfinishedmsg, activemerge, unresolved
     )
 
 
 def findpossible(cmd, table, strict=False):
     """
     Return cmd -> (aliases, command table entry)
     for each matching command.
     Return debug commands (or their aliases) only if no normal command matches.
     """
     choice = {}
     debugchoice = {}
 
     if cmd in table:
         # short-circuit exact matches, "log" alias beats "log|history"
         keys = [cmd]
     else:
         keys = table.keys()
 
     allcmds = []
     for e in keys:
         aliases = parsealiases(e)
         allcmds.extend(aliases)
         found = None
         if cmd in aliases:
             found = cmd
         elif not strict:
             for a in aliases:
                 if a.startswith(cmd):
                     found = a
                     break
         if found is not None:
             if aliases[0].startswith(b"debug") or found.startswith(b"debug"):
                 debugchoice[found] = (aliases, table[e])
             else:
                 choice[found] = (aliases, table[e])
 
     if not choice and debugchoice:
         choice = debugchoice
 
     return choice, allcmds
 
 
 def findcmd(cmd, table, strict=True):
     """Return (aliases, command table entry) for command string."""
     choice, allcmds = findpossible(cmd, table, strict)
 
     if cmd in choice:
         return choice[cmd]
 
     if len(choice) > 1:
         clist = sorted(choice)
         raise error.AmbiguousCommand(cmd, clist)
 
     if choice:
         return list(choice.values())[0]
 
     raise error.UnknownCommand(cmd, allcmds)
 
 
 def changebranch(ui, repo, revs, label):
     """ Change the branch name of given revs to label """
 
     with repo.wlock(), repo.lock(), repo.transaction(b'branches'):
         # abort in case of uncommitted merge or dirty wdir
         bailifchanged(repo)
         revs = scmutil.revrange(repo, revs)
         if not revs:
             raise error.Abort(b"empty revision set")
         roots = repo.revs(b'roots(%ld)', revs)
         if len(roots) > 1:
             raise error.Abort(
                 _(b"cannot change branch of non-linear revisions")
             )
         rewriteutil.precheck(repo, revs, b'change branch of')
 
         root = repo[roots.first()]
         rpb = {parent.branch() for parent in root.parents()}
         if label not in rpb and label in repo.branchmap():
             raise error.Abort(_(b"a branch of the same name already exists"))
 
         if repo.revs(b'obsolete() and %ld', revs):
             raise error.Abort(
                 _(b"cannot change branch of a obsolete changeset")
             )
 
         # make sure only topological heads
         if repo.revs(b'heads(%ld) - head()', revs):
             raise error.Abort(_(b"cannot change branch in middle of a stack"))
 
         replacements = {}
         # avoid import cycle mercurial.cmdutil -> mercurial.context ->
         # mercurial.subrepo -> mercurial.cmdutil
         from . import context
 
         for rev in revs:
             ctx = repo[rev]
             oldbranch = ctx.branch()
             # check if ctx has same branch
             if oldbranch == label:
                 continue
 
             def filectxfn(repo, newctx, path):
                 try:
                     return ctx[path]
                 except error.ManifestLookupError:
                     return None
 
             ui.debug(
                 b"changing branch of '%s' from '%s' to '%s'\n"
                 % (hex(ctx.node()), oldbranch, label)
             )
             extra = ctx.extra()
             extra[b'branch_change'] = hex(ctx.node())
             # While changing branch of set of linear commits, make sure that
             # we base our commits on new parent rather than old parent which
             # was obsoleted while changing the branch
             p1 = ctx.p1().node()
             p2 = ctx.p2().node()
             if p1 in replacements:
                 p1 = replacements[p1][0]
             if p2 in replacements:
                 p2 = replacements[p2][0]
 
             mc = context.memctx(
                 repo,
                 (p1, p2),
                 ctx.description(),
                 ctx.files(),
                 filectxfn,
                 user=ctx.user(),
                 date=ctx.date(),
                 extra=extra,
                 branch=label,
             )
 
             newnode = repo.commitctx(mc)
             replacements[ctx.node()] = (newnode,)
             ui.debug(b'new node id is %s\n' % hex(newnode))
 
         # create obsmarkers and move bookmarks
         scmutil.cleanupnodes(
             repo, replacements, b'branch-change', fixphase=True
         )
 
         # move the working copy too
         wctx = repo[None]
         # in-progress merge is a bit too complex for now.
         if len(wctx.parents()) == 1:
             newid = replacements.get(wctx.p1().node())
             if newid is not None:
                 # avoid import cycle mercurial.cmdutil -> mercurial.hg ->
                 # mercurial.cmdutil
                 from . import hg
 
                 hg.update(repo, newid[0], quietempty=True)
 
         ui.status(_(b"changed branch on %d changesets\n") % len(replacements))
 
 
 def findrepo(p):
     while not os.path.isdir(os.path.join(p, b".hg")):
         oldp, p = p, os.path.dirname(p)
         if p == oldp:
             return None
 
     return p
 
 
 def bailifchanged(repo, merge=True, hint=None):
     """ enforce the precondition that working directory must be clean.
 
     'merge' can be set to false if a pending uncommitted merge should be
     ignored (such as when 'update --check' runs).
 
     'hint' is the usual hint given to Abort exception.
     """
 
     if merge and repo.dirstate.p2() != nullid:
         raise error.Abort(_(b'outstanding uncommitted merge'), hint=hint)
     st = repo.status()
     if st.modified or st.added or st.removed or st.deleted:
         raise error.Abort(_(b'uncommitted changes'), hint=hint)
     ctx = repo[None]
     for s in sorted(ctx.substate):
         ctx.sub(s).bailifchanged(hint=hint)
 
 
 def logmessage(ui, opts):
     """ get the log message according to -m and -l option """
 
     check_at_most_one_arg(opts, b'message', b'logfile')
 
     message = opts.get(b'message')
     logfile = opts.get(b'logfile')
 
     if not message and logfile:
         try:
             if isstdiofilename(logfile):
                 message = ui.fin.read()
             else:
                 message = b'\n'.join(util.readfile(logfile).splitlines())
         except IOError as inst:
             raise error.Abort(
                 _(b"can't read commit message '%s': %s")
                 % (logfile, encoding.strtolocal(inst.strerror))
             )
     return message
 
 
 def mergeeditform(ctxorbool, baseformname):
     """return appropriate editform name (referencing a committemplate)
 
     'ctxorbool' is either a ctx to be committed, or a bool indicating whether
     merging is committed.
 
     This returns baseformname with '.merge' appended if it is a merge,
     otherwise '.normal' is appended.
     """
     if isinstance(ctxorbool, bool):
         if ctxorbool:
             return baseformname + b".merge"
     elif len(ctxorbool.parents()) > 1:
         return baseformname + b".merge"
 
     return baseformname + b".normal"
 
 
 def getcommiteditor(
     edit=False, finishdesc=None, extramsg=None, editform=b'', **opts
 ):
     """get appropriate commit message editor according to '--edit' option
 
     'finishdesc' is a function to be called with edited commit message
     (= 'description' of the new changeset) just after editing, but
     before checking empty-ness. It should return actual text to be
     stored into history. This allows to change description before
     storing.
 
     'extramsg' is a extra message to be shown in the editor instead of
     'Leave message empty to abort commit' line. 'HG: ' prefix and EOL
     is automatically added.
 
     'editform' is a dot-separated list of names, to distinguish
     the purpose of commit text editing.
 
     'getcommiteditor' returns 'commitforceeditor' regardless of
     'edit', if one of 'finishdesc' or 'extramsg' is specified, because
     they are specific for usage in MQ.
     """
     if edit or finishdesc or extramsg:
         return lambda r, c, s: commitforceeditor(
             r, c, s, finishdesc=finishdesc, extramsg=extramsg, editform=editform
         )
     elif editform:
         return lambda r, c, s: commiteditor(r, c, s, editform=editform)
     else:
         return commiteditor
 
 
 def _escapecommandtemplate(tmpl):
     parts = []
     for typ, start, end in templater.scantemplate(tmpl, raw=True):
         if typ == b'string':
             parts.append(stringutil.escapestr(tmpl[start:end]))
         else:
             parts.append(tmpl[start:end])
     return b''.join(parts)
 
 
 def rendercommandtemplate(ui, tmpl, props):
     r"""Expand a literal template 'tmpl' in a way suitable for command line
 
     '\' in outermost string is not taken as an escape character because it
     is a directory separator on Windows.
 
     >>> from . import ui as uimod
     >>> ui = uimod.ui()
     >>> rendercommandtemplate(ui, b'c:\\{path}', {b'path': b'foo'})
     'c:\\foo'
     >>> rendercommandtemplate(ui, b'{"c:\\{path}"}', {'path': b'foo'})
     'c:{path}'
     """
     if not tmpl:
         return tmpl
     t = formatter.maketemplater(ui, _escapecommandtemplate(tmpl))
     return t.renderdefault(props)
 
 
 def rendertemplate(ctx, tmpl, props=None):
     """Expand a literal template 'tmpl' byte-string against one changeset
 
     Each props item must be a stringify-able value or a callable returning
     such value, i.e. no bare list nor dict should be passed.
     """
     repo = ctx.repo()
     tres = formatter.templateresources(repo.ui, repo)
     t = formatter.maketemplater(
         repo.ui, tmpl, defaults=templatekw.keywords, resources=tres
     )
     mapping = {b'ctx': ctx}
     if props:
         mapping.update(props)
     return t.renderdefault(mapping)
 
 
 def _buildfntemplate(pat, total=None, seqno=None, revwidth=None, pathname=None):
     r"""Convert old-style filename format string to template string
 
     >>> _buildfntemplate(b'foo-%b-%n.patch', seqno=0)
     'foo-{reporoot|basename}-{seqno}.patch'
     >>> _buildfntemplate(b'%R{tags % "{tag}"}%H')
     '{rev}{tags % "{tag}"}{node}'
 
     '\' in outermost strings has to be escaped because it is a directory
     separator on Windows:
 
     >>> _buildfntemplate(b'c:\\tmp\\%R\\%n.patch', seqno=0)
     'c:\\\\tmp\\\\{rev}\\\\{seqno}.patch'
     >>> _buildfntemplate(b'\\\\foo\\bar.patch')
     '\\\\\\\\foo\\\\bar.patch'
     >>> _buildfntemplate(b'\\{tags % "{tag}"}')
     '\\\\{tags % "{tag}"}'
 
     but inner strings follow the template rules (i.e. '\' is taken as an
     escape character):
 
     >>> _buildfntemplate(br'{"c:\tmp"}', seqno=0)
     '{"c:\\tmp"}'
     """
     expander = {
         b'H': b'{node}',
         b'R': b'{rev}',
         b'h': b'{node|short}',
         b'm': br'{sub(r"[^\w]", "_", desc|firstline)}',
         b'r': b'{if(revwidth, pad(rev, revwidth, "0", left=True), rev)}',
         b'%': b'%',
         b'b': b'{reporoot|basename}',
     }
     if total is not None:
         expander[b'N'] = b'{total}'
     if seqno is not None:
         expander[b'n'] = b'{seqno}'
     if total is not None and seqno is not None:
         expander[b'n'] = b'{pad(seqno, total|stringify|count, "0", left=True)}'
     if pathname is not None:
         expander[b's'] = b'{pathname|basename}'
         expander[b'd'] = b'{if(pathname|dirname, pathname|dirname, ".")}'
         expander[b'p'] = b'{pathname}'
 
     newname = []
     for typ, start, end in templater.scantemplate(pat, raw=True):
         if typ != b'string':
             newname.append(pat[start:end])
             continue
         i = start
         while i < end:
             n = pat.find(b'%', i, end)
             if n < 0:
                 newname.append(stringutil.escapestr(pat[i:end]))
                 break
             newname.append(stringutil.escapestr(pat[i:n]))
             if n + 2 > end:
                 raise error.Abort(
                     _(b"incomplete format spec in output filename")
                 )
             c = pat[n + 1 : n + 2]
             i = n + 2
             try:
                 newname.append(expander[c])
             except KeyError:
                 raise error.Abort(
                     _(b"invalid format spec '%%%s' in output filename") % c
                 )
     return b''.join(newname)
 
 
 def makefilename(ctx, pat, **props):
     if not pat:
         return pat
     tmpl = _buildfntemplate(pat, **props)
     # BUG: alias expansion shouldn't be made against template fragments
     # rewritten from %-format strings, but we have no easy way to partially
     # disable the expansion.
     return rendertemplate(ctx, tmpl, pycompat.byteskwargs(props))
 
 
 def isstdiofilename(pat):
     """True if the given pat looks like a filename denoting stdin/stdout"""
     return not pat or pat == b'-'
 
 
 class _unclosablefile(object):
     def __init__(self, fp):
         self._fp = fp
 
     def close(self):
         pass
 
     def __iter__(self):
         return iter(self._fp)
 
     def __getattr__(self, attr):
         return getattr(self._fp, attr)
 
     def __enter__(self):
         return self
 
     def __exit__(self, exc_type, exc_value, exc_tb):
         pass
 
 
 def makefileobj(ctx, pat, mode=b'wb', **props):
     writable = mode not in (b'r', b'rb')
 
     if isstdiofilename(pat):
         repo = ctx.repo()
         if writable:
             fp = repo.ui.fout
         else:
             fp = repo.ui.fin
         return _unclosablefile(fp)
     fn = makefilename(ctx, pat, **props)
     return open(fn, mode)
 
 
 def openstorage(repo, cmd, file_, opts, returnrevlog=False):
     """opens the changelog, manifest, a filelog or a given revlog"""
     cl = opts[b'changelog']
     mf = opts[b'manifest']
     dir = opts[b'dir']
     msg = None
     if cl and mf:
         msg = _(b'cannot specify --changelog and --manifest at the same time')
     elif cl and dir:
         msg = _(b'cannot specify --changelog and --dir at the same time')
     elif cl or mf or dir:
         if file_:
             msg = _(b'cannot specify filename with --changelog or --manifest')
         elif not repo:
             msg = _(
                 b'cannot specify --changelog or --manifest or --dir '
                 b'without a repository'
             )
     if msg:
         raise error.Abort(msg)
 
     r = None
     if repo:
         if cl:
             r = repo.unfiltered().changelog
         elif dir:
             if b'treemanifest' not in repo.requirements:
                 raise error.Abort(
                     _(
                         b"--dir can only be used on repos with "
                         b"treemanifest enabled"
                     )
                 )
             if not dir.endswith(b'/'):
                 dir = dir + b'/'
             dirlog = repo.manifestlog.getstorage(dir)
             if len(dirlog):
                 r = dirlog
         elif mf:
             r = repo.manifestlog.getstorage(b'')
         elif file_:
             filelog = repo.file(file_)
             if len(filelog):
                 r = filelog
 
         # Not all storage may be revlogs. If requested, try to return an actual
         # revlog instance.
         if returnrevlog:
             if isinstance(r, revlog.revlog):
                 pass
             elif util.safehasattr(r, b'_revlog'):
                 r = r._revlog  # pytype: disable=attribute-error
             elif r is not None:
                 raise error.Abort(_(b'%r does not appear to be a revlog') % r)
 
     if not r:
         if not returnrevlog:
             raise error.Abort(_(b'cannot give path to non-revlog'))
 
         if not file_:
             raise error.CommandError(cmd, _(b'invalid arguments'))
         if not os.path.isfile(file_):
             raise error.Abort(_(b"revlog '%s' not found") % file_)
         r = revlog.revlog(
             vfsmod.vfs(encoding.getcwd(), audit=False), file_[:-2] + b".i"
         )
     return r
 
 
 def openrevlog(repo, cmd, file_, opts):
     """Obtain a revlog backing storage of an item.
 
     This is similar to ``openstorage()`` except it always returns a revlog.
 
     In most cases, a caller cares about the main storage object - not the
     revlog backing it. Therefore, this function should only be used by code
     that needs to examine low-level revlog implementation details. e.g. debug
     commands.
     """
     return openstorage(repo, cmd, file_, opts, returnrevlog=True)
 
 
 def copy(ui, repo, pats, opts, rename=False):
     # called with the repo lock held
     #
     # hgsep => pathname that uses "/" to separate directories
     # ossep => pathname that uses os.sep to separate directories
     cwd = repo.getcwd()
     targets = {}
     after = opts.get(b"after")
     dryrun = opts.get(b"dry_run")
     wctx = repo[None]
 
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
 
     def walkpat(pat):
         srcs = []
         if after:
             badstates = b'?'
         else:
             badstates = b'?r'
         m = scmutil.match(wctx, [pat], opts, globbed=True)
         for abs in wctx.walk(m):
             state = repo.dirstate[abs]
             rel = uipathfn(abs)
             exact = m.exact(abs)
             if state in badstates:
                 if exact and state == b'?':
                     ui.warn(_(b'%s: not copying - file is not managed\n') % rel)
                 if exact and state == b'r':
                     ui.warn(
                         _(
                             b'%s: not copying - file has been marked for'
                             b' remove\n'
                         )
                         % rel
                     )
                 continue
             # abs: hgsep
             # rel: ossep
             srcs.append((abs, rel, exact))
         return srcs
 
     # abssrc: hgsep
     # relsrc: ossep
     # otarget: ossep
     def copyfile(abssrc, relsrc, otarget, exact):
         abstarget = pathutil.canonpath(repo.root, cwd, otarget)
         if b'/' in abstarget:
             # We cannot normalize abstarget itself, this would prevent
             # case only renames, like a => A.
             abspath, absname = abstarget.rsplit(b'/', 1)
             abstarget = repo.dirstate.normalize(abspath) + b'/' + absname
         reltarget = repo.pathto(abstarget, cwd)
         target = repo.wjoin(abstarget)
         src = repo.wjoin(abssrc)
         state = repo.dirstate[abstarget]
 
         scmutil.checkportable(ui, abstarget)
 
         # check for collisions
         prevsrc = targets.get(abstarget)
         if prevsrc is not None:
             ui.warn(
                 _(b'%s: not overwriting - %s collides with %s\n')
                 % (
                     reltarget,
                     repo.pathto(abssrc, cwd),
                     repo.pathto(prevsrc, cwd),
                 )
             )
             return True  # report a failure
 
         # check for overwrites
         exists = os.path.lexists(target)
         samefile = False
         if exists and abssrc != abstarget:
             if repo.dirstate.normalize(abssrc) == repo.dirstate.normalize(
                 abstarget
             ):
                 if not rename:
                     ui.warn(_(b"%s: can't copy - same file\n") % reltarget)
                     return True  # report a failure
                 exists = False
                 samefile = True
 
         if not after and exists or after and state in b'mn':
             if not opts[b'force']:
                 if state in b'mn':
                     msg = _(b'%s: not overwriting - file already committed\n')
                     if after:
                         flags = b'--after --force'
                     else:
                         flags = b'--force'
                     if rename:
                         hint = (
                             _(
                                 b"('hg rename %s' to replace the file by "
                                 b'recording a rename)\n'
                             )
                             % flags
                         )
                     else:
                         hint = (
                             _(
                                 b"('hg copy %s' to replace the file by "
                                 b'recording a copy)\n'
                             )
                             % flags
                         )
                 else:
                     msg = _(b'%s: not overwriting - file exists\n')
                     if rename:
                         hint = _(
                             b"('hg rename --after' to record the rename)\n"
                         )
                     else:
                         hint = _(b"('hg copy --after' to record the copy)\n")
                 ui.warn(msg % reltarget)
                 ui.warn(hint)
                 return True  # report a failure
 
         if after:
             if not exists:
                 if rename:
                     ui.warn(
                         _(b'%s: not recording move - %s does not exist\n')
                         % (relsrc, reltarget)
                     )
                 else:
                     ui.warn(
                         _(b'%s: not recording copy - %s does not exist\n')
                         % (relsrc, reltarget)
                     )
                 return True  # report a failure
         elif not dryrun:
             try:
                 if exists:
                     os.unlink(target)
                 targetdir = os.path.dirname(target) or b'.'
                 if not os.path.isdir(targetdir):
                     os.makedirs(targetdir)
                 if samefile:
                     tmp = target + b"~hgrename"
                     os.rename(src, tmp)
                     os.rename(tmp, target)
                 else:
                     # Preserve stat info on renames, not on copies; this matches
                     # Linux CLI behavior.
                     util.copyfile(src, target, copystat=rename)
                 srcexists = True
             except IOError as inst:
                 if inst.errno == errno.ENOENT:
                     ui.warn(_(b'%s: deleted in working directory\n') % relsrc)
                     srcexists = False
                 else:
                     ui.warn(
                         _(b'%s: cannot copy - %s\n')
                         % (relsrc, encoding.strtolocal(inst.strerror))
                     )
                     return True  # report a failure
 
         if ui.verbose or not exact:
             if rename:
                 ui.status(_(b'moving %s to %s\n') % (relsrc, reltarget))
             else:
                 ui.status(_(b'copying %s to %s\n') % (relsrc, reltarget))
 
         targets[abstarget] = abssrc
 
         # fix up dirstate
         scmutil.dirstatecopy(
             ui, repo, wctx, abssrc, abstarget, dryrun=dryrun, cwd=cwd
         )
         if rename and not dryrun:
             if not after and srcexists and not samefile:
                 rmdir = repo.ui.configbool(b'experimental', b'removeemptydirs')
                 repo.wvfs.unlinkpath(abssrc, rmdir=rmdir)
             wctx.forget([abssrc])
 
     # pat: ossep
     # dest ossep
     # srcs: list of (hgsep, hgsep, ossep, bool)
     # return: function that takes hgsep and returns ossep
     def targetpathfn(pat, dest, srcs):
         if os.path.isdir(pat):
             abspfx = pathutil.canonpath(repo.root, cwd, pat)
             abspfx = util.localpath(abspfx)
             if destdirexists:
                 striplen = len(os.path.split(abspfx)[0])
             else:
                 striplen = len(abspfx)
             if striplen:
                 striplen += len(pycompat.ossep)
             res = lambda p: os.path.join(dest, util.localpath(p)[striplen:])
         elif destdirexists:
             res = lambda p: os.path.join(
                 dest, os.path.basename(util.localpath(p))
             )
         else:
             res = lambda p: dest
         return res
 
     # pat: ossep
     # dest ossep
     # srcs: list of (hgsep, hgsep, ossep, bool)
     # return: function that takes hgsep and returns ossep
     def targetpathafterfn(pat, dest, srcs):
         if matchmod.patkind(pat):
             # a mercurial pattern
             res = lambda p: os.path.join(
                 dest, os.path.basename(util.localpath(p))
             )
         else:
             abspfx = pathutil.canonpath(repo.root, cwd, pat)
             if len(abspfx) < len(srcs[0][0]):
                 # A directory. Either the target path contains the last
                 # component of the source path or it does not.
                 def evalpath(striplen):
                     score = 0
                     for s in srcs:
                         t = os.path.join(dest, util.localpath(s[0])[striplen:])
                         if os.path.lexists(t):
                             score += 1
                     return score
 
                 abspfx = util.localpath(abspfx)
                 striplen = len(abspfx)
                 if striplen:
                     striplen += len(pycompat.ossep)
                 if os.path.isdir(os.path.join(dest, os.path.split(abspfx)[1])):
                     score = evalpath(striplen)
                     striplen1 = len(os.path.split(abspfx)[0])
                     if striplen1:
                         striplen1 += len(pycompat.ossep)
                     if evalpath(striplen1) > score:
                         striplen = striplen1
                 res = lambda p: os.path.join(dest, util.localpath(p)[striplen:])
             else:
                 # a file
                 if destdirexists:
                     res = lambda p: os.path.join(
                         dest, os.path.basename(util.localpath(p))
                     )
                 else:
                     res = lambda p: dest
         return res
 
     pats = scmutil.expandpats(pats)
     if not pats:
         raise error.Abort(_(b'no source or destination specified'))
     if len(pats) == 1:
         raise error.Abort(_(b'no destination specified'))
     dest = pats.pop()
     destdirexists = os.path.isdir(dest) and not os.path.islink(dest)
     if not destdirexists:
         if len(pats) > 1 or matchmod.patkind(pats[0]):
             raise error.Abort(
                 _(
                     b'with multiple sources, destination must be an '
                     b'existing directory'
                 )
             )
         if util.endswithsep(dest):
             raise error.Abort(_(b'destination %s is not a directory') % dest)
 
     tfn = targetpathfn
     if after:
         tfn = targetpathafterfn
     copylist = []
     for pat in pats:
         srcs = walkpat(pat)
         if not srcs:
             continue
         copylist.append((tfn(pat, dest, srcs), srcs))
     if not copylist:
         raise error.Abort(_(b'no files to copy'))
 
     errors = 0
     for targetpath, srcs in copylist:
         for abssrc, relsrc, exact in srcs:
             if copyfile(abssrc, relsrc, targetpath(abssrc), exact):
                 errors += 1
 
     return errors != 0
 
 
 ## facility to let extension process additional data into an import patch
 # list of identifier to be executed in order
 extrapreimport = []  # run before commit
 extrapostimport = []  # run after commit
 # mapping from identifier to actual import function
 #
 # 'preimport' are run before the commit is made and are provided the following
 # arguments:
 # - repo: the localrepository instance,
 # - patchdata: data extracted from patch header (cf m.patch.patchheadermap),
 # - extra: the future extra dictionary of the changeset, please mutate it,
 # - opts: the import options.
 # XXX ideally, we would just pass an ctx ready to be computed, that would allow
 # mutation of in memory commit and more. Feel free to rework the code to get
 # there.
 extrapreimportmap = {}
 # 'postimport' are run after the commit is made and are provided the following
 # argument:
 # - ctx: the changectx created by import.
 extrapostimportmap = {}
 
 
 def tryimportone(ui, repo, patchdata, parents, opts, msgs, updatefunc):
     """Utility function used by commands.import to import a single patch
 
     This function is explicitly defined here to help the evolve extension to
     wrap this part of the import logic.
 
     The API is currently a bit ugly because it a simple code translation from
     the import command. Feel free to make it better.
 
     :patchdata: a dictionary containing parsed patch data (such as from
                 ``patch.extract()``)
     :parents: nodes that will be parent of the created commit
     :opts: the full dict of option passed to the import command
     :msgs: list to save commit message to.
            (used in case we need to save it when failing)
     :updatefunc: a function that update a repo to a given node
                  updatefunc(<repo>, <node>)
     """
     # avoid cycle context -> subrepo -> cmdutil
     from . import context
 
     tmpname = patchdata.get(b'filename')
     message = patchdata.get(b'message')
     user = opts.get(b'user') or patchdata.get(b'user')
     date = opts.get(b'date') or patchdata.get(b'date')
     branch = patchdata.get(b'branch')
     nodeid = patchdata.get(b'nodeid')
     p1 = patchdata.get(b'p1')
     p2 = patchdata.get(b'p2')
 
     nocommit = opts.get(b'no_commit')
     importbranch = opts.get(b'import_branch')
     update = not opts.get(b'bypass')
     strip = opts[b"strip"]
     prefix = opts[b"prefix"]
     sim = float(opts.get(b'similarity') or 0)
 
     if not tmpname:
         return None, None, False
 
     rejects = False
 
     cmdline_message = logmessage(ui, opts)
     if cmdline_message:
         # pickup the cmdline msg
         message = cmdline_message
     elif message:
         # pickup the patch msg
         message = message.strip()
     else:
         # launch the editor
         message = None
     ui.debug(b'message:\n%s\n' % (message or b''))
 
     if len(parents) == 1:
         parents.append(repo[nullid])
     if opts.get(b'exact'):
         if not nodeid or not p1:
             raise error.Abort(_(b'not a Mercurial patch'))
         p1 = repo[p1]
         p2 = repo[p2 or nullid]
     elif p2:
         try:
             p1 = repo[p1]
             p2 = repo[p2]
             # Without any options, consider p2 only if the
             # patch is being applied on top of the recorded
             # first parent.
             if p1 != parents[0]:
                 p1 = parents[0]
                 p2 = repo[nullid]
         except error.RepoError:
             p1, p2 = parents
         if p2.node() == nullid:
             ui.warn(
                 _(
                     b"warning: import the patch as a normal revision\n"
                     b"(use --exact to import the patch as a merge)\n"
                 )
             )
     else:
         p1, p2 = parents
 
     n = None
     if update:
         if p1 != parents[0]:
             updatefunc(repo, p1.node())
         if p2 != parents[1]:
             repo.setparents(p1.node(), p2.node())
 
         if opts.get(b'exact') or importbranch:
             repo.dirstate.setbranch(branch or b'default')
 
         partial = opts.get(b'partial', False)
         files = set()
         try:
             patch.patch(
                 ui,
                 repo,
                 tmpname,
                 strip=strip,
                 prefix=prefix,
                 files=files,
                 eolmode=None,
                 similarity=sim / 100.0,
             )
         except error.PatchError as e:
             if not partial:
                 raise error.Abort(pycompat.bytestr(e))
             if partial:
                 rejects = True
 
         files = list(files)
         if nocommit:
             if message:
                 msgs.append(message)
         else:
             if opts.get(b'exact') or p2:
                 # If you got here, you either use --force and know what
                 # you are doing or used --exact or a merge patch while
                 # being updated to its first parent.
                 m = None
             else:
                 m = scmutil.matchfiles(repo, files or [])
             editform = mergeeditform(repo[None], b'import.normal')
             if opts.get(b'exact'):
                 editor = None
             else:
                 editor = getcommiteditor(
                     editform=editform, **pycompat.strkwargs(opts)
                 )
             extra = {}
             for idfunc in extrapreimport:
                 extrapreimportmap[idfunc](repo, patchdata, extra, opts)
             overrides = {}
             if partial:
                 overrides[(b'ui', b'allowemptycommit')] = True
             if opts.get(b'secret'):
                 overrides[(b'phases', b'new-commit')] = b'secret'
             with repo.ui.configoverride(overrides, b'import'):
                 n = repo.commit(
                     message, user, date, match=m, editor=editor, extra=extra
                 )
                 for idfunc in extrapostimport:
                     extrapostimportmap[idfunc](repo[n])
     else:
         if opts.get(b'exact') or importbranch:
             branch = branch or b'default'
         else:
             branch = p1.branch()
         store = patch.filestore()
         try:
             files = set()
             try:
                 patch.patchrepo(
                     ui,
                     repo,
                     p1,
                     store,
                     tmpname,
                     strip,
                     prefix,
                     files,
                     eolmode=None,
                 )
             except error.PatchError as e:
                 raise error.Abort(stringutil.forcebytestr(e))
             if opts.get(b'exact'):
                 editor = None
             else:
                 editor = getcommiteditor(editform=b'import.bypass')
             memctx = context.memctx(
                 repo,
                 (p1.node(), p2.node()),
                 message,
                 files=files,
                 filectxfn=store,
                 user=user,
                 date=date,
                 branch=branch,
                 editor=editor,
             )
             n = memctx.commit()
         finally:
             store.close()
     if opts.get(b'exact') and nocommit:
         # --exact with --no-commit is still useful in that it does merge
         # and branch bits
         ui.warn(_(b"warning: can't check exact import with --no-commit\n"))
     elif opts.get(b'exact') and (not n or hex(n) != nodeid):
         raise error.Abort(_(b'patch is damaged or loses information'))
     msg = _(b'applied to working directory')
     if n:
         # i18n: refers to a short changeset id
         msg = _(b'created %s') % short(n)
     return msg, n, rejects
 
 
 # facility to let extensions include additional data in an exported patch
 # list of identifiers to be executed in order
 extraexport = []
 # mapping from identifier to actual export function
 # function as to return a string to be added to the header or None
 # it is given two arguments (sequencenumber, changectx)
 extraexportmap = {}
 
 
 def _exportsingle(repo, ctx, fm, match, switch_parent, seqno, diffopts):
     node = scmutil.binnode(ctx)
     parents = [p.node() for p in ctx.parents() if p]
     branch = ctx.branch()
     if switch_parent:
         parents.reverse()
 
     if parents:
         prev = parents[0]
     else:
         prev = nullid
 
     fm.context(ctx=ctx)
     fm.plain(b'# HG changeset patch\n')
     fm.write(b'user', b'# User %s\n', ctx.user())
     fm.plain(b'# Date %d %d\n' % ctx.date())
     fm.write(b'date', b'#      %s\n', fm.formatdate(ctx.date()))
     fm.condwrite(
         branch and branch != b'default', b'branch', b'# Branch %s\n', branch
     )
     fm.write(b'node', b'# Node ID %s\n', hex(node))
     fm.plain(b'# Parent  %s\n' % hex(prev))
     if len(parents) > 1:
         fm.plain(b'# Parent  %s\n' % hex(parents[1]))
     fm.data(parents=fm.formatlist(pycompat.maplist(hex, parents), name=b'node'))
 
     # TODO: redesign extraexportmap function to support formatter
     for headerid in extraexport:
         header = extraexportmap[headerid](seqno, ctx)
         if header is not None:
             fm.plain(b'# %s\n' % header)
 
     fm.write(b'desc', b'%s\n', ctx.description().rstrip())
     fm.plain(b'\n')
 
     if fm.isplain():
         chunkiter = patch.diffui(repo, prev, node, match, opts=diffopts)
         for chunk, label in chunkiter:
             fm.plain(chunk, label=label)
     else:
         chunkiter = patch.diff(repo, prev, node, match, opts=diffopts)
         # TODO: make it structured?
         fm.data(diff=b''.join(chunkiter))
 
 
 def _exportfile(repo, revs, fm, dest, switch_parent, diffopts, match):
     """Export changesets to stdout or a single file"""
     for seqno, rev in enumerate(revs, 1):
         ctx = repo[rev]
         if not dest.startswith(b'<'):
             repo.ui.note(b"%s\n" % dest)
         fm.startitem()
         _exportsingle(repo, ctx, fm, match, switch_parent, seqno, diffopts)
 
 
 def _exportfntemplate(
     repo, revs, basefm, fntemplate, switch_parent, diffopts, match
 ):
     """Export changesets to possibly multiple files"""
     total = len(revs)
     revwidth = max(len(str(rev)) for rev in revs)
     filemap = util.sortdict()  # filename: [(seqno, rev), ...]
 
     for seqno, rev in enumerate(revs, 1):
         ctx = repo[rev]
         dest = makefilename(
             ctx, fntemplate, total=total, seqno=seqno, revwidth=revwidth
         )
         filemap.setdefault(dest, []).append((seqno, rev))
 
     for dest in filemap:
         with formatter.maybereopen(basefm, dest) as fm:
             repo.ui.note(b"%s\n" % dest)
             for seqno, rev in filemap[dest]:
                 fm.startitem()
                 ctx = repo[rev]
                 _exportsingle(
                     repo, ctx, fm, match, switch_parent, seqno, diffopts
                 )
 
 
 def _prefetchchangedfiles(repo, revs, match):
     allfiles = set()
     for rev in revs:
         for file in repo[rev].files():
             if not match or match(file):
                 allfiles.add(file)
     scmutil.prefetchfiles(repo, revs, scmutil.matchfiles(repo, allfiles))
 
 
 def export(
     repo,
     revs,
     basefm,
     fntemplate=b'hg-%h.patch',
     switch_parent=False,
     opts=None,
     match=None,
 ):
     '''export changesets as hg patches
 
     Args:
       repo: The repository from which we're exporting revisions.
       revs: A list of revisions to export as revision numbers.
       basefm: A formatter to which patches should be written.
       fntemplate: An optional string to use for generating patch file names.
       switch_parent: If True, show diffs against second parent when not nullid.
                      Default is false, which always shows diff against p1.
       opts: diff options to use for generating the patch.
       match: If specified, only export changes to files matching this matcher.
 
     Returns:
       Nothing.
 
     Side Effect:
       "HG Changeset Patch" data is emitted to one of the following
       destinations:
         fntemplate specified: Each rev is written to a unique file named using
                             the given template.
         Otherwise: All revs will be written to basefm.
     '''
     _prefetchchangedfiles(repo, revs, match)
 
     if not fntemplate:
         _exportfile(
             repo, revs, basefm, b'<unnamed>', switch_parent, opts, match
         )
     else:
         _exportfntemplate(
             repo, revs, basefm, fntemplate, switch_parent, opts, match
         )
 
 
 def exportfile(repo, revs, fp, switch_parent=False, opts=None, match=None):
     """Export changesets to the given file stream"""
     _prefetchchangedfiles(repo, revs, match)
 
     dest = getattr(fp, 'name', b'<unnamed>')
     with formatter.formatter(repo.ui, fp, b'export', {}) as fm:
         _exportfile(repo, revs, fm, dest, switch_parent, opts, match)
 
 
 def showmarker(fm, marker, index=None):
     """utility function to display obsolescence marker in a readable way
 
     To be used by debug function."""
     if index is not None:
         fm.write(b'index', b'%i ', index)
     fm.write(b'prednode', b'%s ', hex(marker.prednode()))
     succs = marker.succnodes()
     fm.condwrite(
         succs,
         b'succnodes',
         b'%s ',
         fm.formatlist(map(hex, succs), name=b'node'),
     )
     fm.write(b'flag', b'%X ', marker.flags())
     parents = marker.parentnodes()
     if parents is not None:
         fm.write(
             b'parentnodes',
             b'{%s} ',
             fm.formatlist(map(hex, parents), name=b'node', sep=b', '),
         )
     fm.write(b'date', b'(%s) ', fm.formatdate(marker.date()))
     meta = marker.metadata().copy()
     meta.pop(b'date', None)
     smeta = pycompat.rapply(pycompat.maybebytestr, meta)
     fm.write(
         b'metadata', b'{%s}', fm.formatdict(smeta, fmt=b'%r: %r', sep=b', ')
     )
     fm.plain(b'\n')
 
 
 def finddate(ui, repo, date):
     """Find the tipmost changeset that matches the given date spec"""
 
     df = dateutil.matchdate(date)
     m = scmutil.matchall(repo)
     results = {}
 
     def prep(ctx, fns):
         d = ctx.date()
         if df(d[0]):
             results[ctx.rev()] = d
 
     for ctx in walkchangerevs(repo, m, {b'rev': None}, prep):
         rev = ctx.rev()
         if rev in results:
             ui.status(
                 _(b"found revision %d from %s\n")
                 % (rev, dateutil.datestr(results[rev]))
             )
             return b'%d' % rev
 
     raise error.Abort(_(b"revision matching date not found"))
 
 
 def increasingwindows(windowsize=8, sizelimit=512):
     while True:
         yield windowsize
         if windowsize < sizelimit:
             windowsize *= 2
 
 
 def _walkrevs(repo, opts):
     # Default --rev value depends on --follow but --follow behavior
     # depends on revisions resolved from --rev...
     follow = opts.get(b'follow') or opts.get(b'follow_first')
     if opts.get(b'rev'):
         revs = scmutil.revrange(repo, opts[b'rev'])
     elif follow and repo.dirstate.p1() == nullid:
         revs = smartset.baseset()
     elif follow:
         revs = repo.revs(b'reverse(:.)')
     else:
         revs = smartset.spanset(repo)
         revs.reverse()
     return revs
 
 
 class FileWalkError(Exception):
     pass
 
 
 def walkfilerevs(repo, match, follow, revs, fncache):
     '''Walks the file history for the matched files.
 
     Returns the changeset revs that are involved in the file history.
 
     Throws FileWalkError if the file history can't be walked using
     filelogs alone.
     '''
     wanted = set()
     copies = []
     minrev, maxrev = min(revs), max(revs)
 
     def filerevs(filelog, last):
         """
         Only files, no patterns.  Check the history of each file.
 
         Examines filelog entries within minrev, maxrev linkrev range
         Returns an iterator yielding (linkrev, parentlinkrevs, copied)
         tuples in backwards order
         """
         cl_count = len(repo)
         revs = []
         for j in pycompat.xrange(0, last + 1):
             linkrev = filelog.linkrev(j)
             if linkrev < minrev:
                 continue
             # only yield rev for which we have the changelog, it can
             # happen while doing "hg log" during a pull or commit
             if linkrev >= cl_count:
                 break
 
             parentlinkrevs = []
             for p in filelog.parentrevs(j):
                 if p != nullrev:
                     parentlinkrevs.append(filelog.linkrev(p))
             n = filelog.node(j)
             revs.append(
                 (linkrev, parentlinkrevs, follow and filelog.renamed(n))
             )
 
         return reversed(revs)
 
     def iterfiles():
         pctx = repo[b'.']
         for filename in match.files():
             if follow:
                 if filename not in pctx:
                     raise error.Abort(
                         _(
                             b'cannot follow file not in parent '
                             b'revision: "%s"'
                         )
                         % filename
                     )
                 yield filename, pctx[filename].filenode()
             else:
                 yield filename, None
         for filename_node in copies:
             yield filename_node
 
     for file_, node in iterfiles():
         filelog = repo.file(file_)
         if not len(filelog):
             if node is None:
                 # A zero count may be a directory or deleted file, so
                 # try to find matching entries on the slow path.
                 if follow:
                     raise error.Abort(
                         _(b'cannot follow nonexistent file: "%s"') % file_
                     )
                 raise FileWalkError(b"Cannot walk via filelog")
             else:
                 continue
 
         if node is None:
             last = len(filelog) - 1
         else:
             last = filelog.rev(node)
 
         # keep track of all ancestors of the file
         ancestors = {filelog.linkrev(last)}
 
         # iterate from latest to oldest revision
         for rev, flparentlinkrevs, copied in filerevs(filelog, last):
             if not follow:
                 if rev > maxrev:
                     continue
             else:
                 # Note that last might not be the first interesting
                 # rev to us:
                 # if the file has been changed after maxrev, we'll
                 # have linkrev(last) > maxrev, and we still need
                 # to explore the file graph
                 if rev not in ancestors:
                     continue
                 # XXX insert 1327 fix here
                 if flparentlinkrevs:
                     ancestors.update(flparentlinkrevs)
 
             fncache.setdefault(rev, []).append(file_)
             wanted.add(rev)
             if copied:
                 copies.append(copied)
 
     return wanted
 
 
 class _followfilter(object):
     def __init__(self, repo, onlyfirst=False):
         self.repo = repo
         self.startrev = nullrev
         self.roots = set()
         self.onlyfirst = onlyfirst
 
     def match(self, rev):
         def realparents(rev):
             if self.onlyfirst:
                 return self.repo.changelog.parentrevs(rev)[0:1]
             else:
                 return filter(
                     lambda x: x != nullrev, self.repo.changelog.parentrevs(rev)
                 )
 
         if self.startrev == nullrev:
             self.startrev = rev
             return True
 
         if rev > self.startrev:
             # forward: all descendants
             if not self.roots:
                 self.roots.add(self.startrev)
             for parent in realparents(rev):
                 if parent in self.roots:
                     self.roots.add(rev)
                     return True
         else:
             # backwards: all parents
             if not self.roots:
                 self.roots.update(realparents(self.startrev))
             if rev in self.roots:
                 self.roots.remove(rev)
                 self.roots.update(realparents(rev))
                 return True
 
         return False
 
 
 def walkchangerevs(repo, match, opts, prepare):
     '''Iterate over files and the revs in which they changed.
 
     Callers most commonly need to iterate backwards over the history
     in which they are interested. Doing so has awful (quadratic-looking)
     performance, so we use iterators in a "windowed" way.
 
     We walk a window of revisions in the desired order.  Within the
     window, we first walk forwards to gather data, then in the desired
     order (usually backwards) to display it.
 
     This function returns an iterator yielding contexts. Before
     yielding each context, the iterator will first call the prepare
     function on each context in the window in forward order.'''
 
     allfiles = opts.get(b'all_files')
     follow = opts.get(b'follow') or opts.get(b'follow_first')
     revs = _walkrevs(repo, opts)
     if not revs:
         return []
     wanted = set()
     slowpath = match.anypats() or (not match.always() and opts.get(b'removed'))
     fncache = {}
     change = repo.__getitem__
 
     # First step is to fill wanted, the set of revisions that we want to yield.
     # When it does not induce extra cost, we also fill fncache for revisions in
     # wanted: a cache of filenames that were changed (ctx.files()) and that
     # match the file filtering conditions.
 
     if match.always() or allfiles:
         # No files, no patterns.  Display all revs.
         wanted = revs
     elif not slowpath:
         # We only have to read through the filelog to find wanted revisions
 
         try:
             wanted = walkfilerevs(repo, match, follow, revs, fncache)
         except FileWalkError:
             slowpath = True
 
             # We decided to fall back to the slowpath because at least one
             # of the paths was not a file. Check to see if at least one of them
             # existed in history, otherwise simply return
             for path in match.files():
                 if path == b'.' or path in repo.store:
                     break
             else:
                 return []
 
     if slowpath:
         # We have to read the changelog to match filenames against
         # changed files
 
         if follow:
             raise error.Abort(
                 _(b'can only follow copies/renames for explicit filenames')
             )
 
         # The slow path checks files modified in every changeset.
         # This is really slow on large repos, so compute the set lazily.
         class lazywantedset(object):
             def __init__(self):
                 self.set = set()
                 self.revs = set(revs)
 
             # No need to worry about locality here because it will be accessed
             # in the same order as the increasing window below.
             def __contains__(self, value):
                 if value in self.set:
                     return True
                 elif not value in self.revs:
                     return False
                 else:
                     self.revs.discard(value)
                     ctx = change(value)
                     if allfiles:
                         matches = list(ctx.manifest().walk(match))
                     else:
                         matches = [f for f in ctx.files() if match(f)]
                     if matches:
                         fncache[value] = matches
                         self.set.add(value)
                         return True
                     return False
 
             def discard(self, value):
                 self.revs.discard(value)
                 self.set.discard(value)
 
         wanted = lazywantedset()
 
     # it might be worthwhile to do this in the iterator if the rev range
     # is descending and the prune args are all within that range
     for rev in opts.get(b'prune', ()):
         rev = repo[rev].rev()
         ff = _followfilter(repo)
         stop = min(revs[0], revs[-1])
         for x in pycompat.xrange(rev, stop - 1, -1):
             if ff.match(x):
                 wanted = wanted - [x]
 
     # Now that wanted is correctly initialized, we can iterate over the
     # revision range, yielding only revisions in wanted.
     def iterate():
         if follow and match.always():
             ff = _followfilter(repo, onlyfirst=opts.get(b'follow_first'))
 
             def want(rev):
                 return ff.match(rev) and rev in wanted
 
         else:
 
             def want(rev):
                 return rev in wanted
 
         it = iter(revs)
         stopiteration = False
         for windowsize in increasingwindows():
             nrevs = []
             for i in pycompat.xrange(windowsize):
                 rev = next(it, None)
                 if rev is None:
                     stopiteration = True
                     break
                 elif want(rev):
                     nrevs.append(rev)
             for rev in sorted(nrevs):
                 fns = fncache.get(rev)
                 ctx = change(rev)
                 if not fns:
 
                     def fns_generator():
                         if allfiles:
 
                             def bad(f, msg):
                                 pass
 
                             for f in ctx.matches(matchmod.badmatch(match, bad)):
                                 yield f
                         else:
                             for f in ctx.files():
                                 if match(f):
                                     yield f
 
                     fns = fns_generator()
                 prepare(ctx, fns)
             for rev in nrevs:
                 yield change(rev)
 
             if stopiteration:
                 break
 
     return iterate()
 
 
 def add(ui, repo, match, prefix, uipathfn, explicitonly, **opts):
     bad = []
 
     badfn = lambda x, y: bad.append(x) or match.bad(x, y)
     names = []
     wctx = repo[None]
     cca = None
     abort, warn = scmutil.checkportabilityalert(ui)
     if abort or warn:
         cca = scmutil.casecollisionauditor(ui, abort, repo.dirstate)
 
     match = repo.narrowmatch(match, includeexact=True)
     badmatch = matchmod.badmatch(match, badfn)
     dirstate = repo.dirstate
     # We don't want to just call wctx.walk here, since it would return a lot of
     # clean files, which we aren't interested in and takes time.
     for f in sorted(
         dirstate.walk(
             badmatch,
             subrepos=sorted(wctx.substate),
             unknown=True,
             ignored=False,
             full=False,
         )
     ):
         exact = match.exact(f)
         if exact or not explicitonly and f not in wctx and repo.wvfs.lexists(f):
             if cca:
                 cca(f)
             names.append(f)
             if ui.verbose or not exact:
                 ui.status(
                     _(b'adding %s\n') % uipathfn(f), label=b'ui.addremove.added'
                 )
 
     for subpath in sorted(wctx.substate):
         sub = wctx.sub(subpath)
         try:
             submatch = matchmod.subdirmatcher(subpath, match)
             subprefix = repo.wvfs.reljoin(prefix, subpath)
             subuipathfn = scmutil.subdiruipathfn(subpath, uipathfn)
             if opts.get('subrepos'):
                 bad.extend(
                     sub.add(ui, submatch, subprefix, subuipathfn, False, **opts)
                 )
             else:
                 bad.extend(
                     sub.add(ui, submatch, subprefix, subuipathfn, True, **opts)
                 )
         except error.LookupError:
             ui.status(
                 _(b"skipping missing subrepository: %s\n") % uipathfn(subpath)
             )
 
     if not opts.get('dry_run'):
         rejected = wctx.add(names, prefix)
         bad.extend(f for f in rejected if f in match.files())
     return bad
 
 
 def addwebdirpath(repo, serverpath, webconf):
     webconf[serverpath] = repo.root
     repo.ui.debug(b'adding %s = %s\n' % (serverpath, repo.root))
 
     for r in repo.revs(b'filelog("path:.hgsub")'):
         ctx = repo[r]
         for subpath in ctx.substate:
             ctx.sub(subpath).addwebdirpath(serverpath, webconf)
 
 
 def forget(
     ui, repo, match, prefix, uipathfn, explicitonly, dryrun, interactive
 ):
     if dryrun and interactive:
         raise error.Abort(_(b"cannot specify both --dry-run and --interactive"))
     bad = []
     badfn = lambda x, y: bad.append(x) or match.bad(x, y)
     wctx = repo[None]
     forgot = []
 
     s = repo.status(match=matchmod.badmatch(match, badfn), clean=True)
     forget = sorted(s.modified + s.added + s.deleted + s.clean)
     if explicitonly:
         forget = [f for f in forget if match.exact(f)]
 
     for subpath in sorted(wctx.substate):
         sub = wctx.sub(subpath)
         submatch = matchmod.subdirmatcher(subpath, match)
         subprefix = repo.wvfs.reljoin(prefix, subpath)
         subuipathfn = scmutil.subdiruipathfn(subpath, uipathfn)
         try:
             subbad, subforgot = sub.forget(
                 submatch,
                 subprefix,
                 subuipathfn,
                 dryrun=dryrun,
                 interactive=interactive,
             )
             bad.extend([subpath + b'/' + f for f in subbad])
             forgot.extend([subpath + b'/' + f for f in subforgot])
         except error.LookupError:
             ui.status(
                 _(b"skipping missing subrepository: %s\n") % uipathfn(subpath)
             )
 
     if not explicitonly:
         for f in match.files():
             if f not in repo.dirstate and not repo.wvfs.isdir(f):
                 if f not in forgot:
                     if repo.wvfs.exists(f):
                         # Don't complain if the exact case match wasn't given.
                         # But don't do this until after checking 'forgot', so
                         # that subrepo files aren't normalized, and this op is
                         # purely from data cached by the status walk above.
                         if repo.dirstate.normalize(f) in repo.dirstate:
                             continue
                         ui.warn(
                             _(
                                 b'not removing %s: '
                                 b'file is already untracked\n'
                             )
                             % uipathfn(f)
                         )
                     bad.append(f)
 
     if interactive:
         responses = _(
             b'[Ynsa?]'
             b'$$ &Yes, forget this file'
             b'$$ &No, skip this file'
             b'$$ &Skip remaining files'
             b'$$ Include &all remaining files'
             b'$$ &? (display help)'
         )
         for filename in forget[:]:
             r = ui.promptchoice(
                 _(b'forget %s %s') % (uipathfn(filename), responses)
             )
             if r == 4:  # ?
                 while r == 4:
                     for c, t in ui.extractchoices(responses)[1]:
                         ui.write(b'%s - %s\n' % (c, encoding.lower(t)))
                     r = ui.promptchoice(
                         _(b'forget %s %s') % (uipathfn(filename), responses)
                     )
             if r == 0:  # yes
                 continue
             elif r == 1:  # no
                 forget.remove(filename)
             elif r == 2:  # Skip
                 fnindex = forget.index(filename)
                 del forget[fnindex:]
                 break
             elif r == 3:  # All
                 break
 
     for f in forget:
         if ui.verbose or not match.exact(f) or interactive:
             ui.status(
                 _(b'removing %s\n') % uipathfn(f), label=b'ui.addremove.removed'
             )
 
     if not dryrun:
         rejected = wctx.forget(forget, prefix)
         bad.extend(f for f in rejected if f in match.files())
         forgot.extend(f for f in forget if f not in rejected)
     return bad, forgot
 
 
 def files(ui, ctx, m, uipathfn, fm, fmt, subrepos):
     ret = 1
 
     needsfctx = ui.verbose or {b'size', b'flags'} & fm.datahint()
     for f in ctx.matches(m):
         fm.startitem()
         fm.context(ctx=ctx)
         if needsfctx:
             fc = ctx[f]
             fm.write(b'size flags', b'% 10d % 1s ', fc.size(), fc.flags())
         fm.data(path=f)
         fm.plain(fmt % uipathfn(f))
         ret = 0
 
     for subpath in sorted(ctx.substate):
         submatch = matchmod.subdirmatcher(subpath, m)
         subuipathfn = scmutil.subdiruipathfn(subpath, uipathfn)
         if subrepos or m.exact(subpath) or any(submatch.files()):
             sub = ctx.sub(subpath)
             try:
                 recurse = m.exact(subpath) or subrepos
                 if (
                     sub.printfiles(ui, submatch, subuipathfn, fm, fmt, recurse)
                     == 0
                 ):
                     ret = 0
             except error.LookupError:
                 ui.status(
                     _(b"skipping missing subrepository: %s\n")
                     % uipathfn(subpath)
                 )
 
     return ret
 
 
 def remove(
     ui, repo, m, prefix, uipathfn, after, force, subrepos, dryrun, warnings=None
 ):
     ret = 0
     s = repo.status(match=m, clean=True)
     modified, added, deleted, clean = s.modified, s.added, s.deleted, s.clean
 
     wctx = repo[None]
 
     if warnings is None:
         warnings = []
         warn = True
     else:
         warn = False
 
     subs = sorted(wctx.substate)
     progress = ui.makeprogress(
         _(b'searching'), total=len(subs), unit=_(b'subrepos')
     )
     for subpath in subs:
         submatch = matchmod.subdirmatcher(subpath, m)
         subprefix = repo.wvfs.reljoin(prefix, subpath)
         subuipathfn = scmutil.subdiruipathfn(subpath, uipathfn)
         if subrepos or m.exact(subpath) or any(submatch.files()):
             progress.increment()
             sub = wctx.sub(subpath)
             try:
                 if sub.removefiles(
                     submatch,
                     subprefix,
                     subuipathfn,
                     after,
                     force,
                     subrepos,
                     dryrun,
                     warnings,
                 ):
                     ret = 1
             except error.LookupError:
                 warnings.append(
                     _(b"skipping missing subrepository: %s\n")
                     % uipathfn(subpath)
                 )
     progress.complete()
 
     # warn about failure to delete explicit files/dirs
     deleteddirs = pathutil.dirs(deleted)
     files = m.files()
     progress = ui.makeprogress(
         _(b'deleting'), total=len(files), unit=_(b'files')
     )
     for f in files:
 
         def insubrepo():
             for subpath in wctx.substate:
                 if f.startswith(subpath + b'/'):
                     return True
             return False
 
         progress.increment()
         isdir = f in deleteddirs or wctx.hasdir(f)
         if f in repo.dirstate or isdir or f == b'.' or insubrepo() or f in subs:
             continue
 
         if repo.wvfs.exists(f):
             if repo.wvfs.isdir(f):
                 warnings.append(
                     _(b'not removing %s: no tracked files\n') % uipathfn(f)
                 )
             else:
                 warnings.append(
                     _(b'not removing %s: file is untracked\n') % uipathfn(f)
                 )
         # missing files will generate a warning elsewhere
         ret = 1
     progress.complete()
 
     if force:
         list = modified + deleted + clean + added
     elif after:
         list = deleted
         remaining = modified + added + clean
         progress = ui.makeprogress(
             _(b'skipping'), total=len(remaining), unit=_(b'files')
         )
         for f in remaining:
             progress.increment()
             if ui.verbose or (f in files):
                 warnings.append(
                     _(b'not removing %s: file still exists\n') % uipathfn(f)
                 )
             ret = 1
         progress.complete()
     else:
         list = deleted + clean
         progress = ui.makeprogress(
             _(b'skipping'), total=(len(modified) + len(added)), unit=_(b'files')
         )
         for f in modified:
             progress.increment()
             warnings.append(
                 _(
                     b'not removing %s: file is modified (use -f'
                     b' to force removal)\n'
                 )
                 % uipathfn(f)
             )
             ret = 1
         for f in added:
             progress.increment()
             warnings.append(
                 _(
                     b"not removing %s: file has been marked for add"
                     b" (use 'hg forget' to undo add)\n"
                 )
                 % uipathfn(f)
             )
             ret = 1
         progress.complete()
 
     list = sorted(list)
     progress = ui.makeprogress(
         _(b'deleting'), total=len(list), unit=_(b'files')
     )
     for f in list:
         if ui.verbose or not m.exact(f):
             progress.increment()
             ui.status(
                 _(b'removing %s\n') % uipathfn(f), label=b'ui.addremove.removed'
             )
     progress.complete()
 
     if not dryrun:
         with repo.wlock():
             if not after:
                 for f in list:
                     if f in added:
                         continue  # we never unlink added files on remove
                     rmdir = repo.ui.configbool(
                         b'experimental', b'removeemptydirs'
                     )
                     repo.wvfs.unlinkpath(f, ignoremissing=True, rmdir=rmdir)
             repo[None].forget(list)
 
     if warn:
         for warning in warnings:
             ui.warn(warning)
 
     return ret
 
 
 def _catfmtneedsdata(fm):
     return not fm.datahint() or b'data' in fm.datahint()
 
 
 def _updatecatformatter(fm, ctx, matcher, path, decode):
     """Hook for adding data to the formatter used by ``hg cat``.
 
     Extensions (e.g., lfs) can wrap this to inject keywords/data, but must call
     this method first."""
 
     # data() can be expensive to fetch (e.g. lfs), so don't fetch it if it
     # wasn't requested.
     data = b''
     if _catfmtneedsdata(fm):
         data = ctx[path].data()
         if decode:
             data = ctx.repo().wwritedata(path, data)
     fm.startitem()
     fm.context(ctx=ctx)
     fm.write(b'data', b'%s', data)
     fm.data(path=path)
 
 
 def cat(ui, repo, ctx, matcher, basefm, fntemplate, prefix, **opts):
     err = 1
     opts = pycompat.byteskwargs(opts)
 
     def write(path):
         filename = None
         if fntemplate:
             filename = makefilename(
                 ctx, fntemplate, pathname=os.path.join(prefix, path)
             )
             # attempt to create the directory if it does not already exist
             try:
                 os.makedirs(os.path.dirname(filename))
             except OSError:
                 pass
         with formatter.maybereopen(basefm, filename) as fm:
             _updatecatformatter(fm, ctx, matcher, path, opts.get(b'decode'))
 
     # Automation often uses hg cat on single files, so special case it
     # for performance to avoid the cost of parsing the manifest.
     if len(matcher.files()) == 1 and not matcher.anypats():
         file = matcher.files()[0]
         mfl = repo.manifestlog
         mfnode = ctx.manifestnode()
         try:
             if mfnode and mfl[mfnode].find(file)[0]:
                 if _catfmtneedsdata(basefm):
                     scmutil.prefetchfiles(repo, [ctx.rev()], matcher)
                 write(file)
                 return 0
         except KeyError:
             pass
 
     if _catfmtneedsdata(basefm):
         scmutil.prefetchfiles(repo, [ctx.rev()], matcher)
 
     for abs in ctx.walk(matcher):
         write(abs)
         err = 0
 
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
     for subpath in sorted(ctx.substate):
         sub = ctx.sub(subpath)
         try:
             submatch = matchmod.subdirmatcher(subpath, matcher)
             subprefix = os.path.join(prefix, subpath)
             if not sub.cat(
                 submatch,
                 basefm,
                 fntemplate,
                 subprefix,
                 **pycompat.strkwargs(opts)
             ):
                 err = 0
         except error.RepoLookupError:
             ui.status(
                 _(b"skipping missing subrepository: %s\n") % uipathfn(subpath)
             )
 
     return err
 
 
 def commit(ui, repo, commitfunc, pats, opts):
     '''commit the specified files or all outstanding changes'''
     date = opts.get(b'date')
     if date:
         opts[b'date'] = dateutil.parsedate(date)
     message = logmessage(ui, opts)
     matcher = scmutil.match(repo[None], pats, opts)
 
     dsguard = None
     # extract addremove carefully -- this function can be called from a command
     # that doesn't support addremove
     if opts.get(b'addremove'):
         dsguard = dirstateguard.dirstateguard(repo, b'commit')
     with dsguard or util.nullcontextmanager():
         if dsguard:
             relative = scmutil.anypats(pats, opts)
             uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=relative)
             if scmutil.addremove(repo, matcher, b"", uipathfn, opts) != 0:
                 raise error.Abort(
                     _(b"failed to mark all new/missing files as added/removed")
                 )
 
         return commitfunc(ui, repo, message, matcher, opts)
 
 
 def samefile(f, ctx1, ctx2):
     if f in ctx1.manifest():
         a = ctx1.filectx(f)
         if f in ctx2.manifest():
             b = ctx2.filectx(f)
             return not a.cmp(b) and a.flags() == b.flags()
         else:
             return False
     else:
         return f not in ctx2.manifest()
 
 
 def amend(ui, repo, old, extra, pats, opts):
     # avoid cycle context -> subrepo -> cmdutil
     from . import context
 
     # amend will reuse the existing user if not specified, but the obsolete
     # marker creation requires that the current user's name is specified.
     if obsolete.isenabled(repo, obsolete.createmarkersopt):
         ui.username()  # raise exception if username not set
 
     ui.note(_(b'amending changeset %s\n') % old)
     base = old.p1()
 
     with repo.wlock(), repo.lock(), repo.transaction(b'amend'):
         # Participating changesets:
         #
         # wctx     o - workingctx that contains changes from working copy
         #          |   to go into amending commit
         #          |
         # old      o - changeset to amend
         #          |
         # base     o - first parent of the changeset to amend
         wctx = repo[None]
 
         # Copy to avoid mutating input
         extra = extra.copy()
         # Update extra dict from amended commit (e.g. to preserve graft
         # source)
         extra.update(old.extra())
 
         # Also update it from the from the wctx
         extra.update(wctx.extra())
 
         # date-only change should be ignored?
         datemaydiffer = resolvecommitoptions(ui, opts)
 
         date = old.date()
         if opts.get(b'date'):
             date = dateutil.parsedate(opts.get(b'date'))
         user = opts.get(b'user') or old.user()
 
         if len(old.parents()) > 1:
             # ctx.files() isn't reliable for merges, so fall back to the
             # slower repo.status() method
             st = base.status(old)
             files = set(st.modified) | set(st.added) | set(st.removed)
         else:
             files = set(old.files())
 
         # add/remove the files to the working copy if the "addremove" option
         # was specified.
         matcher = scmutil.match(wctx, pats, opts)
         relative = scmutil.anypats(pats, opts)
         uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=relative)
         if opts.get(b'addremove') and scmutil.addremove(
             repo, matcher, b"", uipathfn, opts
         ):
             raise error.Abort(
                 _(b"failed to mark all new/missing files as added/removed")
             )
 
         # Check subrepos. This depends on in-place wctx._status update in
         # subrepo.precommit(). To minimize the risk of this hack, we do
         # nothing if .hgsub does not exist.
         if b'.hgsub' in wctx or b'.hgsub' in old:
             subs, commitsubs, newsubstate = subrepoutil.precommit(
                 ui, wctx, wctx._status, matcher
             )
             # amend should abort if commitsubrepos is enabled
             assert not commitsubs
             if subs:
                 subrepoutil.writestate(repo, newsubstate)
 
         ms = mergemod.mergestate.read(repo)
         mergeutil.checkunresolved(ms)
 
         filestoamend = set(f for f in wctx.files() if matcher(f))
 
         changes = len(filestoamend) > 0
         if changes:
             # Recompute copies (avoid recording a -> b -> a)
             copied = copies.pathcopies(base, wctx, matcher)
             if old.p2:
                 copied.update(copies.pathcopies(old.p2(), wctx, matcher))
 
             # Prune files which were reverted by the updates: if old
             # introduced file X and the file was renamed in the working
             # copy, then those two files are the same and
             # we can discard X from our list of files. Likewise if X
             # was removed, it's no longer relevant. If X is missing (aka
             # deleted), old X must be preserved.
             files.update(filestoamend)
             files = [
                 f
                 for f in files
                 if (f not in filestoamend or not samefile(f, wctx, base))
             ]
 
             def filectxfn(repo, ctx_, path):
                 try:
                     # If the file being considered is not amongst the files
                     # to be amended, we should return the file context from the
                     # old changeset. This avoids issues when only some files in
                     # the working copy are being amended but there are also
                     # changes to other files from the old changeset.
                     if path not in filestoamend:
                         return old.filectx(path)
 
                     # Return None for removed files.
                     if path in wctx.removed():
                         return None
 
                     fctx = wctx[path]
                     flags = fctx.flags()
                     mctx = context.memfilectx(
                         repo,
                         ctx_,
                         fctx.path(),
                         fctx.data(),
                         islink=b'l' in flags,
                         isexec=b'x' in flags,
                         copysource=copied.get(path),
                     )
                     return mctx
                 except KeyError:
                     return None
 
         else:
             ui.note(_(b'copying changeset %s to %s\n') % (old, base))
 
             # Use version of files as in the old cset
             def filectxfn(repo, ctx_, path):
                 try:
                     return old.filectx(path)
                 except KeyError:
                     return None
 
         # See if we got a message from -m or -l, if not, open the editor with
         # the message of the changeset to amend.
         message = logmessage(ui, opts)
 
         editform = mergeeditform(old, b'commit.amend')
 
         if not message:
             message = old.description()
             # Default if message isn't provided and --edit is not passed is to
             # invoke editor, but allow --no-edit. If somehow we don't have any
             # description, let's always start the editor.
             doedit = not message or opts.get(b'edit') in [True, None]
         else:
             # Default if message is provided is to not invoke editor, but allow
             # --edit.
             doedit = opts.get(b'edit') is True
         editor = getcommiteditor(edit=doedit, editform=editform)
 
         pureextra = extra.copy()
         extra[b'amend_source'] = old.hex()
 
         new = context.memctx(
             repo,
             parents=[base.node(), old.p2().node()],
             text=message,
             files=files,
             filectxfn=filectxfn,
             user=user,
             date=date,
             extra=extra,
             editor=editor,
         )
 
         newdesc = changelog.stripdesc(new.description())
         if (
             (not changes)
             and newdesc == old.description()
             and user == old.user()
             and (date == old.date() or datemaydiffer)
             and pureextra == old.extra()
         ):
             # nothing changed. continuing here would create a new node
             # anyway because of the amend_source noise.
             #
             # This not what we expect from amend.
             return old.node()
 
         commitphase = None
         if opts.get(b'secret'):
             commitphase = phases.secret
         newid = repo.commitctx(new)
 
         # Reroute the working copy parent to the new changeset
         repo.setparents(newid, nullid)
         mapping = {old.node(): (newid,)}
         obsmetadata = None
         if opts.get(b'note'):
             obsmetadata = {b'note': encoding.fromlocal(opts[b'note'])}
         backup = ui.configbool(b'rewrite', b'backup-bundle')
         scmutil.cleanupnodes(
             repo,
             mapping,
             b'amend',
             metadata=obsmetadata,
             fixphase=True,
             targetphase=commitphase,
             backup=backup,
         )
 
         # Fixing the dirstate because localrepo.commitctx does not update
         # it. This is rather convenient because we did not need to update
         # the dirstate for all the files in the new commit which commitctx
         # could have done if it updated the dirstate. Now, we can
         # selectively update the dirstate only for the amended files.
         dirstate = repo.dirstate
 
         # Update the state of the files which were added and modified in the
         # amend to "normal" in the dirstate. We need to use "normallookup" since
         # the files may have changed since the command started; using "normal"
         # would mark them as clean but with uncommitted contents.
         normalfiles = set(wctx.modified() + wctx.added()) & filestoamend
         for f in normalfiles:
             dirstate.normallookup(f)
 
         # Update the state of files which were removed in the amend
         # to "removed" in the dirstate.
         removedfiles = set(wctx.removed()) & filestoamend
         for f in removedfiles:
             dirstate.drop(f)
 
     return newid
 
 
 def commiteditor(repo, ctx, subs, editform=b''):
     if ctx.description():
         return ctx.description()
     return commitforceeditor(
         repo, ctx, subs, editform=editform, unchangedmessagedetection=True
     )
 
 
 def commitforceeditor(
     repo,
     ctx,
     subs,
     finishdesc=None,
     extramsg=None,
     editform=b'',
     unchangedmessagedetection=False,
 ):
     if not extramsg:
         extramsg = _(b"Leave message empty to abort commit.")
 
     forms = [e for e in editform.split(b'.') if e]
     forms.insert(0, b'changeset')
     templatetext = None
     while forms:
         ref = b'.'.join(forms)
         if repo.ui.config(b'committemplate', ref):
             templatetext = committext = buildcommittemplate(
                 repo, ctx, subs, extramsg, ref
             )
             break
         forms.pop()
     else:
         committext = buildcommittext(repo, ctx, subs, extramsg)
 
     # run editor in the repository root
     olddir = encoding.getcwd()
     os.chdir(repo.root)
 
     # make in-memory changes visible to external process
     tr = repo.currenttransaction()
     repo.dirstate.write(tr)
     pending = tr and tr.writepending() and repo.root
 
     editortext = repo.ui.edit(
         committext,
         ctx.user(),
         ctx.extra(),
         editform=editform,
         pending=pending,
         repopath=repo.path,
         action=b'commit',
     )
     text = editortext
 
     # strip away anything below this special string (used for editors that want
     # to display the diff)
     stripbelow = re.search(_linebelow, text, flags=re.MULTILINE)
     if stripbelow:
         text = text[: stripbelow.start()]
 
     text = re.sub(b"(?m)^HG:.*(\n|$)", b"", text)
     os.chdir(olddir)
 
     if finishdesc:
         text = finishdesc(text)
     if not text.strip():
         raise error.Abort(_(b"empty commit message"))
     if unchangedmessagedetection and editortext == templatetext:
         raise error.Abort(_(b"commit message unchanged"))
 
     return text
 
 
 def buildcommittemplate(repo, ctx, subs, extramsg, ref):
     ui = repo.ui
     spec = formatter.templatespec(ref, None, None)
     t = logcmdutil.changesettemplater(ui, repo, spec)
     t.t.cache.update(
         (k, templater.unquotestring(v))
         for k, v in repo.ui.configitems(b'committemplate')
     )
 
     if not extramsg:
         extramsg = b''  # ensure that extramsg is string
 
     ui.pushbuffer()
     t.show(ctx, extramsg=extramsg)
     return ui.popbuffer()
 
 
 def hgprefix(msg):
     return b"\n".join([b"HG: %s" % a for a in msg.split(b"\n") if a])
 
 
 def buildcommittext(repo, ctx, subs, extramsg):
     edittext = []
     modified, added, removed = ctx.modified(), ctx.added(), ctx.removed()
     if ctx.description():
         edittext.append(ctx.description())
     edittext.append(b"")
     edittext.append(b"")  # Empty line between message and comments.
     edittext.append(
         hgprefix(
             _(
                 b"Enter commit message."
                 b"  Lines beginning with 'HG:' are removed."
             )
         )
     )
     edittext.append(hgprefix(extramsg))
     edittext.append(b"HG: --")
     edittext.append(hgprefix(_(b"user: %s") % ctx.user()))
     if ctx.p2():
         edittext.append(hgprefix(_(b"branch merge")))
     if ctx.branch():
         edittext.append(hgprefix(_(b"branch '%s'") % ctx.branch()))
     if bookmarks.isactivewdirparent(repo):
         edittext.append(hgprefix(_(b"bookmark '%s'") % repo._activebookmark))
     edittext.extend([hgprefix(_(b"subrepo %s") % s) for s in subs])
     edittext.extend([hgprefix(_(b"added %s") % f) for f in added])
     edittext.extend([hgprefix(_(b"changed %s") % f) for f in modified])
     edittext.extend([hgprefix(_(b"removed %s") % f) for f in removed])
     if not added and not modified and not removed:
         edittext.append(hgprefix(_(b"no files changed")))
     edittext.append(b"")
 
     return b"\n".join(edittext)
 
 
 def commitstatus(repo, node, branch, bheads=None, opts=None):
     if opts is None:
         opts = {}
     ctx = repo[node]
     parents = ctx.parents()
 
     if (
         not opts.get(b'amend')
         and bheads
         and node not in bheads
         and not [
             x for x in parents if x.node() in bheads and x.branch() == branch
         ]
     ):
         repo.ui.status(_(b'created new head\n'))
         # The message is not printed for initial roots. For the other
         # changesets, it is printed in the following situations:
         #
         # Par column: for the 2 parents with ...
         #   N: null or no parent
         #   B: parent is on another named branch
         #   C: parent is a regular non head changeset
         #   H: parent was a branch head of the current branch
         # Msg column: whether we print "created new head" message
         # In the following, it is assumed that there already exists some
         # initial branch heads of the current branch, otherwise nothing is
         # printed anyway.
         #
         # Par Msg Comment
         # N N  y  additional topo root
         #
         # B N  y  additional branch root
         # C N  y  additional topo head
         # H N  n  usual case
         #
         # B B  y  weird additional branch root
         # C B  y  branch merge
         # H B  n  merge with named branch
         #
         # C C  y  additional head from merge
         # C H  n  merge with a head
         #
         # H H  n  head merge: head count decreases
 
     if not opts.get(b'close_branch'):
         for r in parents:
             if r.closesbranch() and r.branch() == branch:
                 repo.ui.status(
                     _(b'reopening closed branch head %d\n') % r.rev()
                 )
 
     if repo.ui.debugflag:
         repo.ui.write(
             _(b'committed changeset %d:%s\n') % (ctx.rev(), ctx.hex())
         )
     elif repo.ui.verbose:
         repo.ui.write(_(b'committed changeset %d:%s\n') % (ctx.rev(), ctx))
 
 
 def postcommitstatus(repo, pats, opts):
     return repo.status(match=scmutil.match(repo[None], pats, opts))
 
 
 def revert(ui, repo, ctx, parents, *pats, **opts):
     opts = pycompat.byteskwargs(opts)
     parent, p2 = parents
     node = ctx.node()
 
     mf = ctx.manifest()
     if node == p2:
         parent = p2
 
     # need all matching names in dirstate and manifest of target rev,
     # so have to walk both. do not print errors if files exist in one
     # but not other. in both cases, filesets should be evaluated against
     # workingctx to get consistent result (issue4497). this means 'set:**'
     # cannot be used to select missing files from target rev.
 
     # `names` is a mapping for all elements in working copy and target revision
     # The mapping is in the form:
     #   <abs path in repo> -> (<path from CWD>, <exactly specified by matcher?>)
     names = {}
     uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
 
     with repo.wlock():
         ## filling of the `names` mapping
         # walk dirstate to fill `names`
 
         interactive = opts.get(b'interactive', False)
         wctx = repo[None]
         m = scmutil.match(wctx, pats, opts)
 
         # we'll need this later
         targetsubs = sorted(s for s in wctx.substate if m(s))
 
         if not m.always():
             matcher = matchmod.badmatch(m, lambda x, y: False)
             for abs in wctx.walk(matcher):
                 names[abs] = m.exact(abs)
 
             # walk target manifest to fill `names`
 
             def badfn(path, msg):
                 if path in names:
                     return
                 if path in ctx.substate:
                     return
                 path_ = path + b'/'
                 for f in names:
                     if f.startswith(path_):
                         return
                 ui.warn(b"%s: %s\n" % (uipathfn(path), msg))
 
             for abs in ctx.walk(matchmod.badmatch(m, badfn)):
                 if abs not in names:
                     names[abs] = m.exact(abs)
 
             # Find status of all file in `names`.
             m = scmutil.matchfiles(repo, names)
 
             changes = repo.status(
                 node1=node, match=m, unknown=True, ignored=True, clean=True
             )
         else:
             changes = repo.status(node1=node, match=m)
             for kind in changes:
                 for abs in kind:
                     names[abs] = m.exact(abs)
 
             m = scmutil.matchfiles(repo, names)
 
         modified = set(changes.modified)
         added = set(changes.added)
         removed = set(changes.removed)
         _deleted = set(changes.deleted)
         unknown = set(changes.unknown)
         unknown.update(changes.ignored)
         clean = set(changes.clean)
         modadded = set()
 
         # We need to account for the state of the file in the dirstate,
         # even when we revert against something else than parent. This will
         # slightly alter the behavior of revert (doing back up or not, delete
         # or just forget etc).
         if parent == node:
             dsmodified = modified
             dsadded = added
             dsremoved = removed
             # store all local modifications, useful later for rename detection
             localchanges = dsmodified | dsadded
             modified, added, removed = set(), set(), set()
         else:
             changes = repo.status(node1=parent, match=m)
             dsmodified = set(changes.modified)
             dsadded = set(changes.added)
             dsremoved = set(changes.removed)
             # store all local modifications, useful later for rename detection
             localchanges = dsmodified | dsadded
 
             # only take into account for removes between wc and target
             clean |= dsremoved - removed
             dsremoved &= removed
             # distinct between dirstate remove and other
             removed -= dsremoved
 
             modadded = added & dsmodified
             added -= modadded
 
             # tell newly modified apart.
             dsmodified &= modified
             dsmodified |= modified & dsadded  # dirstate added may need backup
             modified -= dsmodified
 
             # We need to wait for some post-processing to update this set
             # before making the distinction. The dirstate will be used for
             # that purpose.
             dsadded = added
 
         # in case of merge, files that are actually added can be reported as
         # modified, we need to post process the result
         if p2 != nullid:
             mergeadd = set(dsmodified)
             for path in dsmodified:
                 if path in mf:
                     mergeadd.remove(path)
             dsadded |= mergeadd
             dsmodified -= mergeadd
 
         # if f is a rename, update `names` to also revert the source
         for f in localchanges:
             src = repo.dirstate.copied(f)
             # XXX should we check for rename down to target node?
             if src and src not in names and repo.dirstate[src] == b'r':
                 dsremoved.add(src)
                 names[src] = True
 
         # determine the exact nature of the deleted changesets
         deladded = set(_deleted)
         for path in _deleted:
             if path in mf:
                 deladded.remove(path)
         deleted = _deleted - deladded
 
         # distinguish between file to forget and the other
         added = set()
         for abs in dsadded:
             if repo.dirstate[abs] != b'a':
                 added.add(abs)
         dsadded -= added
 
         for abs in deladded:
             if repo.dirstate[abs] == b'a':
                 dsadded.add(abs)
         deladded -= dsadded
 
         # For files marked as removed, we check if an unknown file is present at
         # the same path. If a such file exists it may need to be backed up.
         # Making the distinction at this stage helps have simpler backup
         # logic.
         removunk = set()
         for abs in removed:
             target = repo.wjoin(abs)
             if os.path.lexists(target):
                 removunk.add(abs)
         removed -= removunk
 
         dsremovunk = set()
         for abs in dsremoved:
             target = repo.wjoin(abs)
             if os.path.lexists(target):
                 dsremovunk.add(abs)
         dsremoved -= dsremovunk
 
         # action to be actually performed by revert
         # (<list of file>, message>) tuple
         actions = {
             b'revert': ([], _(b'reverting %s\n')),
             b'add': ([], _(b'adding %s\n')),
             b'remove': ([], _(b'removing %s\n')),
             b'drop': ([], _(b'removing %s\n')),
             b'forget': ([], _(b'forgetting %s\n')),
             b'undelete': ([], _(b'undeleting %s\n')),
             b'noop': (None, _(b'no changes needed to %s\n')),
             b'unknown': (None, _(b'file not managed: %s\n')),
         }
 
         # "constant" that convey the backup strategy.
         # All set to `discard` if `no-backup` is set do avoid checking
         # no_backup lower in the code.
         # These values are ordered for comparison purposes
         backupinteractive = 3  # do backup if interactively modified
         backup = 2  # unconditionally do backup
         check = 1  # check if the existing file differs from target
         discard = 0  # never do backup
         if opts.get(b'no_backup'):
             backupinteractive = backup = check = discard
         if interactive:
             dsmodifiedbackup = backupinteractive
         else:
             dsmodifiedbackup = backup
         tobackup = set()
 
         backupanddel = actions[b'remove']
         if not opts.get(b'no_backup'):
             backupanddel = actions[b'drop']
 
         disptable = (
             # dispatch table:
             #   file state
             #   action
             #   make backup
             ## Sets that results that will change file on disk
             # Modified compared to target, no local change
             (modified, actions[b'revert'], discard),
             # Modified compared to target, but local file is deleted
             (deleted, actions[b'revert'], discard),
             # Modified compared to target, local change
             (dsmodified, actions[b'revert'], dsmodifiedbackup),
             # Added since target
             (added, actions[b'remove'], discard),
             # Added in working directory
             (dsadded, actions[b'forget'], discard),
             # Added since target, have local modification
             (modadded, backupanddel, backup),
             # Added since target but file is missing in working directory
             (deladded, actions[b'drop'], discard),
             # Removed since  target, before working copy parent
             (removed, actions[b'add'], discard),
             # Same as `removed` but an unknown file exists at the same path
             (removunk, actions[b'add'], check),
             # Removed since targe, marked as such in working copy parent
             (dsremoved, actions[b'undelete'], discard),
             # Same as `dsremoved` but an unknown file exists at the same path
             (dsremovunk, actions[b'undelete'], check),
             ## the following sets does not result in any file changes
             # File with no modification
             (clean, actions[b'noop'], discard),
             # Existing file, not tracked anywhere
             (unknown, actions[b'unknown'], discard),
         )
 
         for abs, exact in sorted(names.items()):
             # target file to be touch on disk (relative to cwd)
             target = repo.wjoin(abs)
             # search the entry in the dispatch table.
             # if the file is in any of these sets, it was touched in the working
             # directory parent and we are sure it needs to be reverted.
             for table, (xlist, msg), dobackup in disptable:
                 if abs not in table:
                     continue
                 if xlist is not None:
                     xlist.append(abs)
                     if dobackup:
                         # If in interactive mode, don't automatically create
                         # .orig files (issue4793)
                         if dobackup == backupinteractive:
                             tobackup.add(abs)
                         elif backup <= dobackup or wctx[abs].cmp(ctx[abs]):
                             absbakname = scmutil.backuppath(ui, repo, abs)
                             bakname = os.path.relpath(
                                 absbakname, start=repo.root
                             )
                             ui.note(
                                 _(b'saving current version of %s as %s\n')
                                 % (uipathfn(abs), uipathfn(bakname))
                             )
                             if not opts.get(b'dry_run'):
                                 if interactive:
                                     util.copyfile(target, absbakname)
                                 else:
                                     util.rename(target, absbakname)
                     if opts.get(b'dry_run'):
                         if ui.verbose or not exact:
                             ui.status(msg % uipathfn(abs))
                 elif exact:
                     ui.warn(msg % uipathfn(abs))
                 break
 
         if not opts.get(b'dry_run'):
             needdata = (b'revert', b'add', b'undelete')
             oplist = [actions[name][0] for name in needdata]
             prefetch = scmutil.prefetchfiles
             matchfiles = scmutil.matchfiles
             prefetch(
                 repo,
                 [ctx.rev()],
                 matchfiles(repo, [f for sublist in oplist for f in sublist]),
             )
             match = scmutil.match(repo[None], pats)
             _performrevert(
                 repo,
                 parents,
                 ctx,
                 names,
                 uipathfn,
                 actions,
                 match,
                 interactive,
                 tobackup,
             )
 
         if targetsubs:
             # Revert the subrepos on the revert list
             for sub in targetsubs:
                 try:
                     wctx.sub(sub).revert(
                         ctx.substate[sub], *pats, **pycompat.strkwargs(opts)
                     )
                 except KeyError:
                     raise error.Abort(
                         b"subrepository '%s' does not exist in %s!"
                         % (sub, short(ctx.node()))
                     )
 
 
 def _performrevert(
     repo,
     parents,
     ctx,
     names,
     uipathfn,
     actions,
     match,
     interactive=False,
     tobackup=None,
 ):
     """function that actually perform all the actions computed for revert
 
     This is an independent function to let extension to plug in and react to
     the imminent revert.
 
     Make sure you have the working directory locked when calling this function.
     """
     parent, p2 = parents
     node = ctx.node()
     excluded_files = []
 
     def checkout(f):
         fc = ctx[f]
         repo.wwrite(f, fc.data(), fc.flags())
 
     def doremove(f):
         try:
             rmdir = repo.ui.configbool(b'experimental', b'removeemptydirs')
             repo.wvfs.unlinkpath(f, rmdir=rmdir)
         except OSError:
             pass
         repo.dirstate.remove(f)
 
     def prntstatusmsg(action, f):
         exact = names[f]
         if repo.ui.verbose or not exact:
             repo.ui.status(actions[action][1] % uipathfn(f))
 
     audit_path = pathutil.pathauditor(repo.root, cached=True)
     for f in actions[b'forget'][0]:
         if interactive:
             choice = repo.ui.promptchoice(
                 _(b"forget added file %s (Yn)?$$ &Yes $$ &No") % uipathfn(f)
             )
             if choice == 0:
                 prntstatusmsg(b'forget', f)
                 repo.dirstate.drop(f)
             else:
                 excluded_files.append(f)
         else:
             prntstatusmsg(b'forget', f)
             repo.dirstate.drop(f)
     for f in actions[b'remove'][0]:
         audit_path(f)
         if interactive:
             choice = repo.ui.promptchoice(
                 _(b"remove added file %s (Yn)?$$ &Yes $$ &No") % uipathfn(f)
             )
             if choice == 0:
                 prntstatusmsg(b'remove', f)
                 doremove(f)
             else:
                 excluded_files.append(f)
         else:
             prntstatusmsg(b'remove', f)
             doremove(f)
     for f in actions[b'drop'][0]:
         audit_path(f)
         prntstatusmsg(b'drop', f)
         repo.dirstate.remove(f)
 
     normal = None
     if node == parent:
         # We're reverting to our parent. If possible, we'd like status
         # to report the file as clean. We have to use normallookup for
         # merges to avoid losing information about merged/dirty files.
         if p2 != nullid:
             normal = repo.dirstate.normallookup
         else:
             normal = repo.dirstate.normal
 
     newlyaddedandmodifiedfiles = set()
     if interactive:
         # Prompt the user for changes to revert
         torevert = [f for f in actions[b'revert'][0] if f not in excluded_files]
         m = scmutil.matchfiles(repo, torevert)
         diffopts = patch.difffeatureopts(
             repo.ui,
             whitespace=True,
             section=b'commands',
             configprefix=b'revert.interactive.',
         )
         diffopts.nodates = True
         diffopts.git = True
         operation = b'apply'
         if node == parent:
             if repo.ui.configbool(
                 b'experimental', b'revert.interactive.select-to-keep'
             ):
                 operation = b'keep'
             else:
                 operation = b'discard'
 
         if operation == b'apply':
             diff = patch.diff(repo, None, ctx.node(), m, opts=diffopts)
         else:
             diff = patch.diff(repo, ctx.node(), None, m, opts=diffopts)
         originalchunks = patch.parsepatch(diff)
 
         try:
 
             chunks, opts = recordfilter(
                 repo.ui, originalchunks, match, operation=operation
             )
             if operation == b'discard':
                 chunks = patch.reversehunks(chunks)
 
         except error.PatchError as err:
             raise error.Abort(_(b'error parsing patch: %s') % err)
 
         # FIXME: when doing an interactive revert of a copy, there's no way of
         # performing a partial revert of the added file, the only option is
         # "remove added file <name> (Yn)?", so we don't need to worry about the
         # alsorestore value. Ideally we'd be able to partially revert
         # copied/renamed files.
         newlyaddedandmodifiedfiles, unusedalsorestore = newandmodified(
             chunks, originalchunks
         )
         if tobackup is None:
             tobackup = set()
         # Apply changes
         fp = stringio()
         # chunks are serialized per file, but files aren't sorted
         for f in sorted(set(c.header.filename() for c in chunks if ishunk(c))):
             prntstatusmsg(b'revert', f)
         files = set()
         for c in chunks:
             if ishunk(c):
                 abs = c.header.filename()
                 # Create a backup file only if this hunk should be backed up
                 if c.header.filename() in tobackup:
                     target = repo.wjoin(abs)
                     bakname = scmutil.backuppath(repo.ui, repo, abs)
                     util.copyfile(target, bakname)
                     tobackup.remove(abs)
                 if abs not in files:
                     files.add(abs)
                     if operation == b'keep':
                         checkout(abs)
             c.write(fp)
         dopatch = fp.tell()
         fp.seek(0)
         if dopatch:
             try:
                 patch.internalpatch(repo.ui, repo, fp, 1, eolmode=None)
             except error.PatchError as err:
                 raise error.Abort(pycompat.bytestr(err))
         del fp
     else:
         for f in actions[b'revert'][0]:
             prntstatusmsg(b'revert', f)
             checkout(f)
             if normal:
                 normal(f)
 
     for f in actions[b'add'][0]:
         # Don't checkout modified files, they are already created by the diff
         if f not in newlyaddedandmodifiedfiles:
             prntstatusmsg(b'add', f)
             checkout(f)
             repo.dirstate.add(f)
 
     normal = repo.dirstate.normallookup
     if node == parent and p2 == nullid:
         normal = repo.dirstate.normal
     for f in actions[b'undelete'][0]:
         if interactive:
             choice = repo.ui.promptchoice(
                 _(b"add back removed file %s (Yn)?$$ &Yes $$ &No") % f
             )
             if choice == 0:
                 prntstatusmsg(b'undelete', f)
                 checkout(f)
                 normal(f)
             else:
                 excluded_files.append(f)
         else:
             prntstatusmsg(b'undelete', f)
             checkout(f)
             normal(f)
 
     copied = copies.pathcopies(repo[parent], ctx)
 
     for f in (
         actions[b'add'][0] + actions[b'undelete'][0] + actions[b'revert'][0]
     ):
         if f in copied:
             repo.dirstate.copy(copied[f], f)
 
 
 # a list of (ui, repo, otherpeer, opts, missing) functions called by
 # commands.outgoing.  "missing" is "missing" of the result of
 # "findcommonoutgoing()"
 outgoinghooks = util.hooks()
 
 # a list of (ui, repo) functions called by commands.summary
 summaryhooks = util.hooks()
 
 # a list of (ui, repo, opts, changes) functions called by commands.summary.
 #
 # functions should return tuple of booleans below, if 'changes' is None:
 #  (whether-incomings-are-needed, whether-outgoings-are-needed)
 #
 # otherwise, 'changes' is a tuple of tuples below:
 #  - (sourceurl, sourcebranch, sourcepeer, incoming)
 #  - (desturl,   destbranch,   destpeer,   outgoing)
 summaryremotehooks = util.hooks()
 
 
 def checkunfinished(repo, commit=False, skipmerge=False):
     '''Look for an unfinished multistep operation, like graft, and abort
     if found. It's probably good to check this right before
     bailifchanged().
     '''
     # Check for non-clearable states first, so things like rebase will take
     # precedence over update.
     for state in statemod._unfinishedstates:
         if (
             state._clearable
             or (commit and state._allowcommit)
             or state._reportonly
         ):
             continue
         if state.isunfinished(repo):
             raise error.Abort(state.msg(), hint=state.hint())
 
     for s in statemod._unfinishedstates:
         if (
             not s._clearable
             or (commit and s._allowcommit)
             or (s._opname == b'merge' and skipmerge)
             or s._reportonly
         ):
             continue
         if s.isunfinished(repo):
             raise error.Abort(s.msg(), hint=s.hint())
 
 
 def clearunfinished(repo):
     '''Check for unfinished operations (as above), and clear the ones
     that are clearable.
     '''
     for state in statemod._unfinishedstates:
         if state._reportonly:
             continue
         if not state._clearable and state.isunfinished(repo):
             raise error.Abort(state.msg(), hint=state.hint())
 
     for s in statemod._unfinishedstates:
         if s._opname == b'merge' or state._reportonly:
             continue
         if s._clearable and s.isunfinished(repo):
             util.unlink(repo.vfs.join(s._fname))
 
 
 def getunfinishedstate(repo):
     ''' Checks for unfinished operations and returns statecheck object
         for it'''
     for state in statemod._unfinishedstates:
         if state.isunfinished(repo):
             return state
     return None
 
 
 def howtocontinue(repo):
     '''Check for an unfinished operation and return the command to finish
     it.
 
     statemod._unfinishedstates list is checked for an unfinished operation
     and the corresponding message to finish it is generated if a method to
     continue is supported by the operation.
 
     Returns a (msg, warning) tuple. 'msg' is a string and 'warning' is
     a boolean.
     '''
     contmsg = _(b"continue: %s")
     for state in statemod._unfinishedstates:
         if not state._continueflag:
             continue
         if state.isunfinished(repo):
             return contmsg % state.continuemsg(), True
     if repo[None].dirty(missing=True, merge=False, branch=False):
         return contmsg % _(b"hg commit"), False
     return None, None
 
 
 def checkafterresolved(repo):
     '''Inform the user about the next action after completing hg resolve
 
     If there's a an unfinished operation that supports continue flag,
     howtocontinue will yield repo.ui.warn as the reporter.
 
     Otherwise, it will yield repo.ui.note.
     '''
     msg, warning = howtocontinue(repo)
     if msg is not None:
         if warning:
             repo.ui.warn(b"%s\n" % msg)
         else:
             repo.ui.note(b"%s\n" % msg)
 
 
 def wrongtooltocontinue(repo, task):
     '''Raise an abort suggesting how to properly continue if there is an
     active task.
 
     Uses howtocontinue() to find the active task.
 
     If there's no task (repo.ui.note for 'hg commit'), it does not offer
     a hint.
     '''
     after = howtocontinue(repo)
     hint = None
     if after[1]:
         hint = after[0]
     raise error.Abort(_(b'no %s in progress') % task, hint=hint)
 
 
 def abortgraft(ui, repo, graftstate):
     """abort the interrupted graft and rollbacks to the state before interrupted
     graft"""
     if not graftstate.exists():
         raise error.Abort(_(b"no interrupted graft to abort"))
     statedata = readgraftstate(repo, graftstate)
     newnodes = statedata.get(b'newnodes')
     if newnodes is None:
         # and old graft state which does not have all the data required to abort
         # the graft
         raise error.Abort(_(b"cannot abort using an old graftstate"))
 
     # changeset from which graft operation was started
     if len(newnodes) > 0:
         startctx = repo[newnodes[0]].p1()
     else:
         startctx = repo[b'.']
     # whether to strip or not
     cleanup = False
     from . import hg
 
     if newnodes:
         newnodes = [repo[r].rev() for r in newnodes]
         cleanup = True
         # checking that none of the newnodes turned public or is public
         immutable = [c for c in newnodes if not repo[c].mutable()]
         if immutable:
             repo.ui.warn(
                 _(b"cannot clean up public changesets %s\n")
                 % b', '.join(bytes(repo[r]) for r in immutable),
                 hint=_(b"see 'hg help phases' for details"),
             )
             cleanup = False
 
         # checking that no new nodes are created on top of grafted revs
         desc = set(repo.changelog.descendants(newnodes))
         if desc - set(newnodes):
             repo.ui.warn(
                 _(
                     b"new changesets detected on destination "
                     b"branch, can't strip\n"
                 )
             )
             cleanup = False
 
         if cleanup:
             with repo.wlock(), repo.lock():
                 hg.updaterepo(repo, startctx.node(), overwrite=True)
                 # stripping the new nodes created
                 strippoints = [
                     c.node() for c in repo.set(b"roots(%ld)", newnodes)
                 ]
                 repair.strip(repo.ui, repo, strippoints, backup=False)
 
     if not cleanup:
         # we don't update to the startnode if we can't strip
         startctx = repo[b'.']
         hg.updaterepo(repo, startctx.node(), overwrite=True)
 
     ui.status(_(b"graft aborted\n"))
     ui.status(_(b"working directory is now at %s\n") % startctx.hex()[:12])
     graftstate.delete()
     return 0
 
 
 def readgraftstate(repo, graftstate):
     # type: (Any, statemod.cmdstate) -> Dict[bytes, Any]
     """read the graft state file and return a dict of the data stored in it"""
     try:
         return graftstate.read()
     except error.CorruptedState:
         nodes = repo.vfs.read(b'graftstate').splitlines()
         return {b'nodes': nodes}
 
 
 def hgabortgraft(ui, repo):
     """ abort logic for aborting graft using 'hg abort'"""
     with repo.wlock():
         graftstate = statemod.cmdstate(repo, b'graftstate')
         return abortgraft(ui, repo, graftstate)

mercurial/help.py

@@ -1,1121 +1,1137 b''
 # help.py - help data for mercurial
 #
 # Copyright 2006 Matt Mackall <[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 itertools
 import re
 import textwrap
 
 from .i18n import (
     _,
     gettext,
 )
 from .pycompat import getattr
 from . import (
     cmdutil,
     encoding,
     error,
     extensions,
     fancyopts,
     filemerge,
     fileset,
     minirst,
     pycompat,
     registrar,
     revset,
     templatefilters,
     templatefuncs,
     templatekw,
     ui as uimod,
     util,
 )
 from .hgweb import webcommands
 from .utils import (
     compression,
     resourceutil,
 )
 
 _exclkeywords = {
     b"(ADVANCED)",
     b"(DEPRECATED)",
     b"(EXPERIMENTAL)",
     # i18n: "(ADVANCED)" is a keyword, must be translated consistently
     _(b"(ADVANCED)"),
     # i18n: "(DEPRECATED)" is a keyword, must be translated consistently
     _(b"(DEPRECATED)"),
     # i18n: "(EXPERIMENTAL)" is a keyword, must be translated consistently
     _(b"(EXPERIMENTAL)"),
 }
 
 # The order in which command categories will be displayed.
 # Extensions with custom categories should insert them into this list
 # after/before the appropriate item, rather than replacing the list or
 # assuming absolute positions.
 CATEGORY_ORDER = [
     registrar.command.CATEGORY_REPO_CREATION,
     registrar.command.CATEGORY_REMOTE_REPO_MANAGEMENT,
     registrar.command.CATEGORY_COMMITTING,
     registrar.command.CATEGORY_CHANGE_MANAGEMENT,
     registrar.command.CATEGORY_CHANGE_ORGANIZATION,
     registrar.command.CATEGORY_FILE_CONTENTS,
     registrar.command.CATEGORY_CHANGE_NAVIGATION,
     registrar.command.CATEGORY_WORKING_DIRECTORY,
     registrar.command.CATEGORY_IMPORT_EXPORT,
     registrar.command.CATEGORY_MAINTENANCE,
     registrar.command.CATEGORY_HELP,
     registrar.command.CATEGORY_MISC,
     registrar.command.CATEGORY_NONE,
 ]
 
 # Human-readable category names. These are translated.
 # Extensions with custom categories should add their names here.
 CATEGORY_NAMES = {
     registrar.command.CATEGORY_REPO_CREATION: b'Repository creation',
     registrar.command.CATEGORY_REMOTE_REPO_MANAGEMENT: b'Remote repository management',
     registrar.command.CATEGORY_COMMITTING: b'Change creation',
     registrar.command.CATEGORY_CHANGE_NAVIGATION: b'Change navigation',
     registrar.command.CATEGORY_CHANGE_MANAGEMENT: b'Change manipulation',
     registrar.command.CATEGORY_CHANGE_ORGANIZATION: b'Change organization',
     registrar.command.CATEGORY_WORKING_DIRECTORY: b'Working directory management',
     registrar.command.CATEGORY_FILE_CONTENTS: b'File content management',
     registrar.command.CATEGORY_IMPORT_EXPORT: b'Change import/export',
     registrar.command.CATEGORY_MAINTENANCE: b'Repository maintenance',
     registrar.command.CATEGORY_HELP: b'Help',
     registrar.command.CATEGORY_MISC: b'Miscellaneous commands',
     registrar.command.CATEGORY_NONE: b'Uncategorized commands',
 }
 
 # Topic categories.
 TOPIC_CATEGORY_IDS = b'ids'
 TOPIC_CATEGORY_OUTPUT = b'output'
 TOPIC_CATEGORY_CONFIG = b'config'
 TOPIC_CATEGORY_CONCEPTS = b'concepts'
 TOPIC_CATEGORY_MISC = b'misc'
 TOPIC_CATEGORY_NONE = b'none'
 
 # The order in which topic categories will be displayed.
 # Extensions with custom categories should insert them into this list
 # after/before the appropriate item, rather than replacing the list or
 # assuming absolute positions.
 TOPIC_CATEGORY_ORDER = [
     TOPIC_CATEGORY_IDS,
     TOPIC_CATEGORY_OUTPUT,
     TOPIC_CATEGORY_CONFIG,
     TOPIC_CATEGORY_CONCEPTS,
     TOPIC_CATEGORY_MISC,
     TOPIC_CATEGORY_NONE,
 ]
 
 # Human-readable topic category names. These are translated.
 TOPIC_CATEGORY_NAMES = {
     TOPIC_CATEGORY_IDS: b'Mercurial identifiers',
     TOPIC_CATEGORY_OUTPUT: b'Mercurial output',
     TOPIC_CATEGORY_CONFIG: b'Mercurial configuration',
     TOPIC_CATEGORY_CONCEPTS: b'Concepts',
     TOPIC_CATEGORY_MISC: b'Miscellaneous',
     TOPIC_CATEGORY_NONE: b'Uncategorized topics',
 }
 
 
 def listexts(header, exts, indent=1, showdeprecated=False):
     '''return a text listing of the given extensions'''
     rst = []
     if exts:
         for name, desc in sorted(pycompat.iteritems(exts)):
             if not showdeprecated and any(w in desc for w in _exclkeywords):
                 continue
             rst.append(b'%s:%s: %s\n' % (b' ' * indent, name, desc))
     if rst:
         rst.insert(0, b'\n%s\n\n' % header)
     return rst
 
 
 def extshelp(ui):
     rst = loaddoc(b'extensions')(ui).splitlines(True)
     rst.extend(
         listexts(
             _(b'enabled extensions:'), extensions.enabled(), showdeprecated=True
         )
     )
     rst.extend(
         listexts(
             _(b'disabled extensions:'),
             extensions.disabled(),
             showdeprecated=ui.verbose,
         )
     )
     doc = b''.join(rst)
     return doc
 
+def parsedefaultmarker(text):
+    """given a text 'abc (DEFAULT: def.ghi)',
+    returns (b'abc', (b'def', b'ghi')). Otherwise return None"""
+    if text[-1:] == b')':
+        marker = b' (DEFAULT: '
+        pos = text.find(marker)
+        if pos >= 0:
+            item = text[pos + len(marker):-1]
+            return text[:pos], item.split(b'.', 2)
 
-def optrst(header, options, verbose):
+def optrst(header, options, verbose, ui):
     data = []
     multioccur = False
     for option in options:
         if len(option) == 5:
             shortopt, longopt, default, desc, optlabel = option
         else:
             shortopt, longopt, default, desc = option
             optlabel = _(b"VALUE")  # default label
 
         if not verbose and any(w in desc for w in _exclkeywords):
             continue
-
+        defaultstrsuffix = b''
+        if default is None:
+            parseresult = parsedefaultmarker(desc)
+            if parseresult is not None:
+                (desc, (section, name)) = parseresult
+                if ui.configbool(section, name):
+                    default = True
+                    defaultstrsuffix = _(b' from config')
         so = b''
         if shortopt:
             so = b'-' + shortopt
         lo = b'--' + longopt
         if default is True:
             lo = b'--[no-]' + longopt
 
         if isinstance(default, fancyopts.customopt):
             default = default.getdefaultvalue()
         if default and not callable(default):
             # default is of unknown type, and in Python 2 we abused
             # the %s-shows-repr property to handle integers etc. To
             # match that behavior on Python 3, we do str(default) and
             # then convert it to bytes.
             defaultstr = pycompat.bytestr(default)
             if default is True:
                 defaultstr = _(b"on")
-            desc += _(b" (default: %s)") % defaultstr
+            desc += _(b" (default: %s)") % (defaultstr + defaultstrsuffix)
 
         if isinstance(default, list):
             lo += b" %s [+]" % optlabel
             multioccur = True
         elif (default is not None) and not isinstance(default, bool):
             lo += b" %s" % optlabel
 
         data.append((so, lo, desc))
 
     if multioccur:
         header += _(b" ([+] can be repeated)")
 
     rst = [b'\n%s:\n\n' % header]
     rst.extend(minirst.maketable(data, 1))
 
     return b''.join(rst)
 
 
 def indicateomitted(rst, omitted, notomitted=None):
     rst.append(b'\n\n.. container:: omitted\n\n    %s\n\n' % omitted)
     if notomitted:
         rst.append(b'\n\n.. container:: notomitted\n\n    %s\n\n' % notomitted)
 
 
 def filtercmd(ui, cmd, func, kw, doc):
     if not ui.debugflag and cmd.startswith(b"debug") and kw != b"debug":
         # Debug command, and user is not looking for those.
         return True
     if not ui.verbose:
         if not kw and not doc:
             # Command had no documentation, no point in showing it by default.
             return True
         if getattr(func, 'alias', False) and not getattr(func, 'owndoc', False):
             # Alias didn't have its own documentation.
             return True
         if doc and any(w in doc for w in _exclkeywords):
             # Documentation has excluded keywords.
             return True
     if kw == b"shortlist" and not getattr(func, 'helpbasic', False):
         # We're presenting the short list but the command is not basic.
         return True
     if ui.configbool(b'help', b'hidden-command.%s' % cmd):
         # Configuration explicitly hides the command.
         return True
     return False
 
 
 def filtertopic(ui, topic):
     return ui.configbool(b'help', b'hidden-topic.%s' % topic, False)
 
 
 def topicmatch(ui, commands, kw):
     """Return help topics matching kw.
 
     Returns {'section': [(name, summary), ...], ...} where section is
     one of topics, commands, extensions, or extensioncommands.
     """
     kw = encoding.lower(kw)
 
     def lowercontains(container):
         return kw in encoding.lower(container)  # translated in helptable
 
     results = {
         b'topics': [],
         b'commands': [],
         b'extensions': [],
         b'extensioncommands': [],
     }
     for topic in helptable:
         names, header, doc = topic[0:3]
         # Old extensions may use a str as doc.
         if (
             sum(map(lowercontains, names))
             or lowercontains(header)
             or (callable(doc) and lowercontains(doc(ui)))
         ):
             name = names[0]
             if not filtertopic(ui, name):
                 results[b'topics'].append((names[0], header))
     for cmd, entry in pycompat.iteritems(commands.table):
         if len(entry) == 3:
             summary = entry[2]
         else:
             summary = b''
         # translate docs *before* searching there
         func = entry[0]
         docs = _(pycompat.getdoc(func)) or b''
         if kw in cmd or lowercontains(summary) or lowercontains(docs):
             doclines = docs.splitlines()
             if doclines:
                 summary = doclines[0]
             cmdname = cmdutil.parsealiases(cmd)[0]
             if filtercmd(ui, cmdname, func, kw, docs):
                 continue
             results[b'commands'].append((cmdname, summary))
     for name, docs in itertools.chain(
         pycompat.iteritems(extensions.enabled(False)),
         pycompat.iteritems(extensions.disabled()),
     ):
         if not docs:
             continue
         name = name.rpartition(b'.')[-1]
         if lowercontains(name) or lowercontains(docs):
             # extension docs are already translated
             results[b'extensions'].append((name, docs.splitlines()[0]))
         try:
             mod = extensions.load(ui, name, b'')
         except ImportError:
             # debug message would be printed in extensions.load()
             continue
         for cmd, entry in pycompat.iteritems(getattr(mod, 'cmdtable', {})):
             if kw in cmd or (len(entry) > 2 and lowercontains(entry[2])):
                 cmdname = cmdutil.parsealiases(cmd)[0]
                 func = entry[0]
                 cmddoc = pycompat.getdoc(func)
                 if cmddoc:
                     cmddoc = gettext(cmddoc).splitlines()[0]
                 else:
                     cmddoc = _(b'(no help text available)')
                 if filtercmd(ui, cmdname, func, kw, cmddoc):
                     continue
                 results[b'extensioncommands'].append((cmdname, cmddoc))
     return results
 
 
 def loaddoc(topic, subdir=None):
     """Return a delayed loader for help/topic.txt."""
 
     def loader(ui):
         package = b'mercurial.helptext'
         if subdir:
             package += b'.' + subdir
         with resourceutil.open_resource(package, topic + b'.txt') as fp:
             doc = gettext(fp.read())
         for rewriter in helphooks.get(topic, []):
             doc = rewriter(ui, topic, doc)
         return doc
 
     return loader
 
 
 internalstable = sorted(
     [
         ([b'bundle2'], _(b'Bundle2'), loaddoc(b'bundle2', subdir=b'internals')),
         ([b'bundles'], _(b'Bundles'), loaddoc(b'bundles', subdir=b'internals')),
         ([b'cbor'], _(b'CBOR'), loaddoc(b'cbor', subdir=b'internals')),
         ([b'censor'], _(b'Censor'), loaddoc(b'censor', subdir=b'internals')),
         (
             [b'changegroups'],
             _(b'Changegroups'),
             loaddoc(b'changegroups', subdir=b'internals'),
         ),
         (
             [b'config'],
             _(b'Config Registrar'),
             loaddoc(b'config', subdir=b'internals'),
         ),
         (
             [b'extensions', b'extension'],
             _(b'Extension API'),
             loaddoc(b'extensions', subdir=b'internals'),
         ),
         (
             [b'mergestate'],
             _(b'Mergestate'),
             loaddoc(b'mergestate', subdir=b'internals'),
         ),
         (
             [b'requirements'],
             _(b'Repository Requirements'),
             loaddoc(b'requirements', subdir=b'internals'),
         ),
         (
             [b'revlogs'],
             _(b'Revision Logs'),
             loaddoc(b'revlogs', subdir=b'internals'),
         ),
         (
             [b'wireprotocol'],
             _(b'Wire Protocol'),
             loaddoc(b'wireprotocol', subdir=b'internals'),
         ),
         (
             [b'wireprotocolrpc'],
             _(b'Wire Protocol RPC'),
             loaddoc(b'wireprotocolrpc', subdir=b'internals'),
         ),
         (
             [b'wireprotocolv2'],
             _(b'Wire Protocol Version 2'),
             loaddoc(b'wireprotocolv2', subdir=b'internals'),
         ),
     ]
 )
 
 
 def internalshelp(ui):
     """Generate the index for the "internals" topic."""
     lines = [
         b'To access a subtopic, use "hg help internals.{subtopic-name}"\n',
         b'\n',
     ]
     for names, header, doc in internalstable:
         lines.append(b' :%s: %s\n' % (names[0], header))
 
     return b''.join(lines)
 
 
 helptable = sorted(
     [
         (
             [b'bundlespec'],
             _(b"Bundle File Formats"),
             loaddoc(b'bundlespec'),
             TOPIC_CATEGORY_CONCEPTS,
         ),
         (
             [b'color'],
             _(b"Colorizing Outputs"),
             loaddoc(b'color'),
             TOPIC_CATEGORY_OUTPUT,
         ),
         (
             [b"config", b"hgrc"],
             _(b"Configuration Files"),
             loaddoc(b'config'),
             TOPIC_CATEGORY_CONFIG,
         ),
         (
             [b'deprecated'],
             _(b"Deprecated Features"),
             loaddoc(b'deprecated'),
             TOPIC_CATEGORY_MISC,
         ),
         (
             [b"dates"],
             _(b"Date Formats"),
             loaddoc(b'dates'),
             TOPIC_CATEGORY_OUTPUT,
         ),
         (
             [b"flags"],
             _(b"Command-line flags"),
             loaddoc(b'flags'),
             TOPIC_CATEGORY_CONFIG,
         ),
         (
             [b"patterns"],
             _(b"File Name Patterns"),
             loaddoc(b'patterns'),
             TOPIC_CATEGORY_IDS,
         ),
         (
             [b'environment', b'env'],
             _(b'Environment Variables'),
             loaddoc(b'environment'),
             TOPIC_CATEGORY_CONFIG,
         ),
         (
             [
                 b'revisions',
                 b'revs',
                 b'revsets',
                 b'revset',
                 b'multirevs',
                 b'mrevs',
             ],
             _(b'Specifying Revisions'),
             loaddoc(b'revisions'),
             TOPIC_CATEGORY_IDS,
         ),
         (
             [b'filesets', b'fileset'],
             _(b"Specifying File Sets"),
             loaddoc(b'filesets'),
             TOPIC_CATEGORY_IDS,
         ),
         (
             [b'diffs'],
             _(b'Diff Formats'),
             loaddoc(b'diffs'),
             TOPIC_CATEGORY_OUTPUT,
         ),
         (
             [b'merge-tools', b'mergetools', b'mergetool'],
             _(b'Merge Tools'),
             loaddoc(b'merge-tools'),
             TOPIC_CATEGORY_CONFIG,
         ),
         (
             [b'templating', b'templates', b'template', b'style'],
             _(b'Template Usage'),
             loaddoc(b'templates'),
             TOPIC_CATEGORY_OUTPUT,
         ),
         ([b'urls'], _(b'URL Paths'), loaddoc(b'urls'), TOPIC_CATEGORY_IDS),
         (
             [b"extensions"],
             _(b"Using Additional Features"),
             extshelp,
             TOPIC_CATEGORY_CONFIG,
         ),
         (
             [b"subrepos", b"subrepo"],
             _(b"Subrepositories"),
             loaddoc(b'subrepos'),
             TOPIC_CATEGORY_CONCEPTS,
         ),
         (
             [b"hgweb"],
             _(b"Configuring hgweb"),
             loaddoc(b'hgweb'),
             TOPIC_CATEGORY_CONFIG,
         ),
         (
             [b"glossary"],
             _(b"Glossary"),
             loaddoc(b'glossary'),
             TOPIC_CATEGORY_CONCEPTS,
         ),
         (
             [b"hgignore", b"ignore"],
             _(b"Syntax for Mercurial Ignore Files"),
             loaddoc(b'hgignore'),
             TOPIC_CATEGORY_IDS,
         ),
         (
             [b"phases"],
             _(b"Working with Phases"),
             loaddoc(b'phases'),
             TOPIC_CATEGORY_CONCEPTS,
         ),
         (
             [b'scripting'],
             _(b'Using Mercurial from scripts and automation'),
             loaddoc(b'scripting'),
             TOPIC_CATEGORY_MISC,
         ),
         (
             [b'internals'],
             _(b"Technical implementation topics"),
             internalshelp,
             TOPIC_CATEGORY_MISC,
         ),
         (
             [b'pager'],
             _(b"Pager Support"),
             loaddoc(b'pager'),
             TOPIC_CATEGORY_CONFIG,
         ),
     ]
 )
 
 # Maps topics with sub-topics to a list of their sub-topics.
 subtopics = {
     b'internals': internalstable,
 }
 
 # Map topics to lists of callable taking the current topic help and
 # returning the updated version
 helphooks = {}
 
 
 def addtopichook(topic, rewriter):
     helphooks.setdefault(topic, []).append(rewriter)
 
 
 def makeitemsdoc(ui, topic, doc, marker, items, dedent=False):
     """Extract docstring from the items key to function mapping, build a
     single documentation block and use it to overwrite the marker in doc.
     """
     entries = []
     for name in sorted(items):
         text = (pycompat.getdoc(items[name]) or b'').rstrip()
         if not text or not ui.verbose and any(w in text for w in _exclkeywords):
             continue
         text = gettext(text)
         if dedent:
             # Abuse latin1 to use textwrap.dedent() on bytes.
             text = textwrap.dedent(text.decode('latin1')).encode('latin1')
         lines = text.splitlines()
         doclines = [(lines[0])]
         for l in lines[1:]:
             # Stop once we find some Python doctest
             if l.strip().startswith(b'>>>'):
                 break
             if dedent:
                 doclines.append(l.rstrip())
             else:
                 doclines.append(b'  ' + l.strip())
         entries.append(b'\n'.join(doclines))
     entries = b'\n\n'.join(entries)
     return doc.replace(marker, entries)
 
 
 def addtopicsymbols(topic, marker, symbols, dedent=False):
     def add(ui, topic, doc):
         return makeitemsdoc(ui, topic, doc, marker, symbols, dedent=dedent)
 
     addtopichook(topic, add)
 
 
 addtopicsymbols(
     b'bundlespec',
     b'.. bundlecompressionmarker',
     compression.bundlecompressiontopics(),
 )
 addtopicsymbols(b'filesets', b'.. predicatesmarker', fileset.symbols)
 addtopicsymbols(
     b'merge-tools', b'.. internaltoolsmarker', filemerge.internalsdoc
 )
 addtopicsymbols(b'revisions', b'.. predicatesmarker', revset.symbols)
 addtopicsymbols(b'templates', b'.. keywordsmarker', templatekw.keywords)
 addtopicsymbols(b'templates', b'.. filtersmarker', templatefilters.filters)
 addtopicsymbols(b'templates', b'.. functionsmarker', templatefuncs.funcs)
 addtopicsymbols(
     b'hgweb', b'.. webcommandsmarker', webcommands.commands, dedent=True
 )
 
 
 def inserttweakrc(ui, topic, doc):
     marker = b'.. tweakdefaultsmarker'
     repl = uimod.tweakrc
 
     def sub(m):
         lines = [m.group(1) + s for s in repl.splitlines()]
         return b'\n'.join(lines)
 
     return re.sub(br'( *)%s' % re.escape(marker), sub, doc)
 
 
 addtopichook(b'config', inserttweakrc)
 
 
 def help_(
     ui,
     commands,
     name,
     unknowncmd=False,
     full=True,
     subtopic=None,
     fullname=None,
     **opts
 ):
     '''
     Generate the help for 'name' as unformatted restructured text. If
     'name' is None, describe the commands available.
     '''
 
     opts = pycompat.byteskwargs(opts)
 
     def helpcmd(name, subtopic=None):
         try:
             aliases, entry = cmdutil.findcmd(
                 name, commands.table, strict=unknowncmd
             )
         except error.AmbiguousCommand as inst:
             # py3 fix: except vars can't be used outside the scope of the
             # except block, nor can be used inside a lambda. python issue4617
             prefix = inst.args[0]
             select = lambda c: cmdutil.parsealiases(c)[0].startswith(prefix)
             rst = helplist(select)
             return rst
 
         rst = []
 
         # check if it's an invalid alias and display its error if it is
         if getattr(entry[0], 'badalias', None):
             rst.append(entry[0].badalias + b'\n')
             if entry[0].unknowncmd:
                 try:
                     rst.extend(helpextcmd(entry[0].cmdname))
                 except error.UnknownCommand:
                     pass
             return rst
 
         # synopsis
         if len(entry) > 2:
             if entry[2].startswith(b'hg'):
                 rst.append(b"%s\n" % entry[2])
             else:
                 rst.append(b'hg %s %s\n' % (aliases[0], entry[2]))
         else:
             rst.append(b'hg %s\n' % aliases[0])
         # aliases
         if full and not ui.quiet and len(aliases) > 1:
             rst.append(_(b"\naliases: %s\n") % b', '.join(aliases[1:]))
         rst.append(b'\n')
 
         # description
         doc = gettext(pycompat.getdoc(entry[0]))
         if not doc:
             doc = _(b"(no help text available)")
         if util.safehasattr(entry[0], b'definition'):  # aliased command
             source = entry[0].source
             if entry[0].definition.startswith(b'!'):  # shell alias
                 doc = _(b'shell alias for: %s\n\n%s\n\ndefined by: %s\n') % (
                     entry[0].definition[1:],
                     doc,
                     source,
                 )
             else:
                 doc = _(b'alias for: hg %s\n\n%s\n\ndefined by: %s\n') % (
                     entry[0].definition,
                     doc,
                     source,
                 )
         doc = doc.splitlines(True)
         if ui.quiet or not full:
             rst.append(doc[0])
         else:
             rst.extend(doc)
         rst.append(b'\n')
 
         # check if this command shadows a non-trivial (multi-line)
         # extension help text
         try:
             mod = extensions.find(name)
             doc = gettext(pycompat.getdoc(mod)) or b''
             if b'\n' in doc.strip():
                 msg = _(
                     b"(use 'hg help -e %s' to show help for "
                     b"the %s extension)"
                 ) % (name, name)
                 rst.append(b'\n%s\n' % msg)
         except KeyError:
             pass
 
         # options
         if not ui.quiet and entry[1]:
-            rst.append(optrst(_(b"options"), entry[1], ui.verbose))
+            rst.append(optrst(_(b"options"), entry[1], ui.verbose, ui))
 
         if ui.verbose:
             rst.append(
-                optrst(_(b"global options"), commands.globalopts, ui.verbose)
+                optrst(_(b"global options"), commands.globalopts, ui.verbose, ui)
             )
 
         if not ui.verbose:
             if not full:
                 rst.append(_(b"\n(use 'hg %s -h' to show more help)\n") % name)
             elif not ui.quiet:
                 rst.append(
                     _(
                         b'\n(some details hidden, use --verbose '
                         b'to show complete help)'
                     )
                 )
 
         return rst
 
     def helplist(select=None, **opts):
         # Category -> list of commands
         cats = {}
         # Command -> short description
         h = {}
         # Command -> string showing synonyms
         syns = {}
         for c, e in pycompat.iteritems(commands.table):
             fs = cmdutil.parsealiases(c)
             f = fs[0]
             syns[f] = b', '.join(fs)
             func = e[0]
             if select and not select(f):
                 continue
             doc = pycompat.getdoc(func)
             if filtercmd(ui, f, func, name, doc):
                 continue
             doc = gettext(doc)
             if not doc:
                 doc = _(b"(no help text available)")
             h[f] = doc.splitlines()[0].rstrip()
 
             cat = getattr(func, 'helpcategory', None) or (
                 registrar.command.CATEGORY_NONE
             )
             cats.setdefault(cat, []).append(f)
 
         rst = []
         if not h:
             if not ui.quiet:
                 rst.append(_(b'no commands defined\n'))
             return rst
 
         # Output top header.
         if not ui.quiet:
             if name == b"shortlist":
                 rst.append(_(b'basic commands:\n\n'))
             elif name == b"debug":
                 rst.append(_(b'debug commands (internal and unsupported):\n\n'))
             else:
                 rst.append(_(b'list of commands:\n'))
 
         def appendcmds(cmds):
             cmds = sorted(cmds)
             for c in cmds:
                 if ui.verbose:
                     rst.append(b" :%s: %s\n" % (syns[c], h[c]))
                 else:
                     rst.append(b' :%s: %s\n' % (c, h[c]))
 
         if name in (b'shortlist', b'debug'):
             # List without categories.
             appendcmds(h)
         else:
             # Check that all categories have an order.
             missing_order = set(cats.keys()) - set(CATEGORY_ORDER)
             if missing_order:
                 ui.develwarn(
                     b'help categories missing from CATEGORY_ORDER: %s'
                     % missing_order
                 )
 
             # List per category.
             for cat in CATEGORY_ORDER:
                 catfns = cats.get(cat, [])
                 if catfns:
                     if len(cats) > 1:
                         catname = gettext(CATEGORY_NAMES[cat])
                         rst.append(b"\n%s:\n" % catname)
                     rst.append(b"\n")
                     appendcmds(catfns)
 
         ex = opts.get
         anyopts = ex('keyword') or not (ex('command') or ex('extension'))
         if not name and anyopts:
             exts = listexts(
                 _(b'enabled extensions:'),
                 extensions.enabled(),
                 showdeprecated=ui.verbose,
             )
             if exts:
                 rst.append(b'\n')
                 rst.extend(exts)
 
             rst.append(_(b"\nadditional help topics:\n"))
             # Group commands by category.
             topiccats = {}
             for topic in helptable:
                 names, header, doc = topic[0:3]
                 if len(topic) > 3 and topic[3]:
                     category = topic[3]
                 else:
                     category = TOPIC_CATEGORY_NONE
 
                 topicname = names[0]
                 if not filtertopic(ui, topicname):
                     topiccats.setdefault(category, []).append(
                         (topicname, header)
                     )
 
             # Check that all categories have an order.
             missing_order = set(topiccats.keys()) - set(TOPIC_CATEGORY_ORDER)
             if missing_order:
                 ui.develwarn(
                     b'help categories missing from TOPIC_CATEGORY_ORDER: %s'
                     % missing_order
                 )
 
             # Output topics per category.
             for cat in TOPIC_CATEGORY_ORDER:
                 topics = topiccats.get(cat, [])
                 if topics:
                     if len(topiccats) > 1:
                         catname = gettext(TOPIC_CATEGORY_NAMES[cat])
                         rst.append(b"\n%s:\n" % catname)
                     rst.append(b"\n")
                     for t, desc in topics:
                         rst.append(b" :%s: %s\n" % (t, desc))
 
         if ui.quiet:
             pass
         elif ui.verbose:
             rst.append(
                 b'\n%s\n'
-                % optrst(_(b"global options"), commands.globalopts, ui.verbose)
+                % optrst(_(b"global options"), commands.globalopts, ui.verbose, ui)
             )
             if name == b'shortlist':
                 rst.append(
                     _(b"\n(use 'hg help' for the full list of commands)\n")
                 )
         else:
             if name == b'shortlist':
                 rst.append(
                     _(
                         b"\n(use 'hg help' for the full list of commands "
                         b"or 'hg -v' for details)\n"
                     )
                 )
             elif name and not full:
                 rst.append(
                     _(b"\n(use 'hg help %s' to show the full help text)\n")
                     % name
                 )
             elif name and syns and name in syns.keys():
                 rst.append(
                     _(
                         b"\n(use 'hg help -v -e %s' to show built-in "
                         b"aliases and global options)\n"
                     )
                     % name
                 )
             else:
                 rst.append(
                     _(
                         b"\n(use 'hg help -v%s' to show built-in aliases "
                         b"and global options)\n"
                     )
                     % (name and b" " + name or b"")
                 )
         return rst
 
     def helptopic(name, subtopic=None):
         # Look for sub-topic entry first.
         header, doc = None, None
         if subtopic and name in subtopics:
             for names, header, doc in subtopics[name]:
                 if subtopic in names:
                     break
             if not any(subtopic in s[0] for s in subtopics[name]):
                 raise error.UnknownCommand(name)
 
         if not header:
             for topic in helptable:
                 names, header, doc = topic[0:3]
                 if name in names:
                     break
             else:
                 raise error.UnknownCommand(name)
 
         rst = [minirst.section(header)]
 
         # description
         if not doc:
             rst.append(b"    %s\n" % _(b"(no help text available)"))
         if callable(doc):
             rst += [b"    %s\n" % l for l in doc(ui).splitlines()]
 
         if not ui.verbose:
             omitted = _(
                 b'(some details hidden, use --verbose'
                 b' to show complete help)'
             )
             indicateomitted(rst, omitted)
 
         try:
             cmdutil.findcmd(name, commands.table)
             rst.append(
                 _(b"\nuse 'hg help -c %s' to see help for the %s command\n")
                 % (name, name)
             )
         except error.UnknownCommand:
             pass
         return rst
 
     def helpext(name, subtopic=None):
         try:
             mod = extensions.find(name)
             doc = gettext(pycompat.getdoc(mod)) or _(b'no help text available')
         except KeyError:
             mod = None
             doc = extensions.disabledext(name)
             if not doc:
                 raise error.UnknownCommand(name)
 
         if b'\n' not in doc:
             head, tail = doc, b""
         else:
             head, tail = doc.split(b'\n', 1)
         rst = [_(b'%s extension - %s\n\n') % (name.rpartition(b'.')[-1], head)]
         if tail:
             rst.extend(tail.splitlines(True))
             rst.append(b'\n')
 
         if not ui.verbose:
             omitted = _(
                 b'(some details hidden, use --verbose'
                 b' to show complete help)'
             )
             indicateomitted(rst, omitted)
 
         if mod:
             try:
                 ct = mod.cmdtable
             except AttributeError:
                 ct = {}
             modcmds = {c.partition(b'|')[0] for c in ct}
             rst.extend(helplist(modcmds.__contains__))
         else:
             rst.append(
                 _(
                     b"(use 'hg help extensions' for information on enabling"
                     b" extensions)\n"
                 )
             )
         return rst
 
     def helpextcmd(name, subtopic=None):
         cmd, ext, doc = extensions.disabledcmd(
             ui, name, ui.configbool(b'ui', b'strict')
         )
         doc = doc.splitlines()[0]
 
         rst = listexts(
             _(b"'%s' is provided by the following extension:") % cmd,
             {ext: doc},
             indent=4,
             showdeprecated=True,
         )
         rst.append(b'\n')
         rst.append(
             _(
                 b"(use 'hg help extensions' for information on enabling "
                 b"extensions)\n"
             )
         )
         return rst
 
     rst = []
     kw = opts.get(b'keyword')
     if kw or name is None and any(opts[o] for o in opts):
         matches = topicmatch(ui, commands, name or b'')
         helpareas = []
         if opts.get(b'extension'):
             helpareas += [(b'extensions', _(b'Extensions'))]
         if opts.get(b'command'):
             helpareas += [(b'commands', _(b'Commands'))]
         if not helpareas:
             helpareas = [
                 (b'topics', _(b'Topics')),
                 (b'commands', _(b'Commands')),
                 (b'extensions', _(b'Extensions')),
                 (b'extensioncommands', _(b'Extension Commands')),
             ]
         for t, title in helpareas:
             if matches[t]:
                 rst.append(b'%s:\n\n' % title)
                 rst.extend(minirst.maketable(sorted(matches[t]), 1))
                 rst.append(b'\n')
         if not rst:
             msg = _(b'no matches')
             hint = _(b"try 'hg help' for a list of topics")
             raise error.Abort(msg, hint=hint)
     elif name and name != b'shortlist':
         queries = []
         if unknowncmd:
             queries += [helpextcmd]
         if opts.get(b'extension'):
             queries += [helpext]
         if opts.get(b'command'):
             queries += [helpcmd]
         if not queries:
             queries = (helptopic, helpcmd, helpext, helpextcmd)
         for f in queries:
             try:
                 rst = f(name, subtopic)
                 break
             except error.UnknownCommand:
                 pass
         else:
             if unknowncmd:
                 raise error.UnknownCommand(name)
             else:
                 if fullname:
                     formatname = fullname
                 else:
                     formatname = name
                 if subtopic:
                     hintname = subtopic
                 else:
                     hintname = name
                 msg = _(b'no such help topic: %s') % formatname
                 hint = _(b"try 'hg help --keyword %s'") % hintname
                 raise error.Abort(msg, hint=hint)
     else:
         # program name
         if not ui.quiet:
             rst = [_(b"Mercurial Distributed SCM\n"), b'\n']
         rst.extend(helplist(None, **pycompat.strkwargs(opts)))
 
     return b''.join(rst)
 
 
 def formattedhelp(
     ui, commands, fullname, keep=None, unknowncmd=False, full=True, **opts
 ):
     """get help for a given topic (as a dotted name) as rendered rst
 
     Either returns the rendered help text or raises an exception.
     """
     if keep is None:
         keep = []
     else:
         keep = list(keep)  # make a copy so we can mutate this later
 
     # <fullname> := <name>[.<subtopic][.<section>]
     name = subtopic = section = None
     if fullname is not None:
         nameparts = fullname.split(b'.')
         name = nameparts.pop(0)
         if nameparts and name in subtopics:
             subtopic = nameparts.pop(0)
         if nameparts:
             section = encoding.lower(b'.'.join(nameparts))
 
     textwidth = ui.configint(b'ui', b'textwidth')
     termwidth = ui.termwidth() - 2
     if textwidth <= 0 or termwidth < textwidth:
         textwidth = termwidth
     text = help_(
         ui,
         commands,
         name,
         fullname=fullname,
         subtopic=subtopic,
         unknowncmd=unknowncmd,
         full=full,
         **opts
     )
 
     blocks, pruned = minirst.parse(text, keep=keep)
     if b'verbose' in pruned:
         keep.append(b'omitted')
     else:
         keep.append(b'notomitted')
     blocks, pruned = minirst.parse(text, keep=keep)
     if section:
         blocks = minirst.filtersections(blocks, section)
 
     # We could have been given a weird ".foo" section without a name
     # to look for, or we could have simply failed to found "foo.bar"
     # because bar isn't a section of foo
     if section and not (blocks and name):
         raise error.Abort(_(b"help section not found: %s") % fullname)
 
     return minirst.formatplain(blocks, textwidth)

tests/test-help.t

@@ -1,3896 +1,3902 b''
 Short help:
 
   $ hg
   Mercurial Distributed SCM
   
   basic commands:
   
    add           add the specified files on the next commit
    annotate      show changeset information by line for each file
    clone         make a copy of an existing repository
    commit        commit the specified files or all outstanding changes
    diff          diff repository (or selected files)
    export        dump the header and diffs for one or more changesets
    forget        forget the specified files on the next commit
    init          create a new repository in the given directory
    log           show revision history of entire repository or files
    merge         merge another revision into working directory
    pull          pull changes from the specified source
    push          push changes to the specified destination
    remove        remove the specified files on the next commit
    serve         start stand-alone webserver
    status        show changed files in the working directory
    summary       summarize working directory state
    update        update working directory (or switch revisions)
   
   (use 'hg help' for the full list of commands or 'hg -v' for details)
 
   $ hg -q
    add           add the specified files on the next commit
    annotate      show changeset information by line for each file
    clone         make a copy of an existing repository
    commit        commit the specified files or all outstanding changes
    diff          diff repository (or selected files)
    export        dump the header and diffs for one or more changesets
    forget        forget the specified files on the next commit
    init          create a new repository in the given directory
    log           show revision history of entire repository or files
    merge         merge another revision into working directory
    pull          pull changes from the specified source
    push          push changes to the specified destination
    remove        remove the specified files on the next commit
    serve         start stand-alone webserver
    status        show changed files in the working directory
    summary       summarize working directory state
    update        update working directory (or switch revisions)
 
 Extra extensions will be printed in help output in a non-reliable order since
 the extension is unknown.
 #if no-extraextensions
 
   $ hg help
   Mercurial Distributed SCM
   
   list of commands:
   
   Repository creation:
   
    clone         make a copy of an existing repository
    init          create a new repository in the given directory
   
   Remote repository management:
   
    incoming      show new changesets found in source
    outgoing      show changesets not found in the destination
    paths         show aliases for remote repositories
    pull          pull changes from the specified source
    push          push changes to the specified destination
    serve         start stand-alone webserver
   
   Change creation:
   
    commit        commit the specified files or all outstanding changes
   
   Change manipulation:
   
    backout       reverse effect of earlier changeset
    graft         copy changes from other branches onto the current branch
    merge         merge another revision into working directory
   
   Change organization:
   
    bookmarks     create a new bookmark or list existing bookmarks
    branch        set or show the current branch name
    branches      list repository named branches
    phase         set or show the current phase name
    tag           add one or more tags for the current or given revision
    tags          list repository tags
   
   File content management:
   
    annotate      show changeset information by line for each file
    cat           output the current or given revision of files
    copy          mark files as copied for the next commit
    diff          diff repository (or selected files)
    grep          search for a pattern in specified files
   
   Change navigation:
   
    bisect        subdivision search of changesets
    heads         show branch heads
    identify      identify the working directory or specified revision
    log           show revision history of entire repository or files
   
   Working directory management:
   
    add           add the specified files on the next commit
    addremove     add all new files, delete all missing files
    files         list tracked files
    forget        forget the specified files on the next commit
    remove        remove the specified files on the next commit
    rename        rename files; equivalent of copy + remove
    resolve       redo merges or set/view the merge status of files
    revert        restore files to their checkout state
    root          print the root (top) of the current working directory
    shelve        save and set aside changes from the working directory
    status        show changed files in the working directory
    summary       summarize working directory state
    unshelve      restore a shelved change to the working directory
    update        update working directory (or switch revisions)
   
   Change import/export:
   
    archive       create an unversioned archive of a repository revision
    bundle        create a bundle file
    export        dump the header and diffs for one or more changesets
    import        import an ordered set of patches
    unbundle      apply one or more bundle files
   
   Repository maintenance:
   
    manifest      output the current or given revision of the project manifest
    recover       roll back an interrupted transaction
    verify        verify the integrity of the repository
   
   Help:
   
    config        show combined config settings from all hgrc files
    help          show help for a given topic or a help overview
    version       output version and copyright information
   
   additional help topics:
   
   Mercurial identifiers:
   
    filesets      Specifying File Sets
    hgignore      Syntax for Mercurial Ignore Files
    patterns      File Name Patterns
    revisions     Specifying Revisions
    urls          URL Paths
   
   Mercurial output:
   
    color         Colorizing Outputs
    dates         Date Formats
    diffs         Diff Formats
    templating    Template Usage
   
   Mercurial configuration:
   
    config        Configuration Files
    environment   Environment Variables
    extensions    Using Additional Features
    flags         Command-line flags
    hgweb         Configuring hgweb
    merge-tools   Merge Tools
    pager         Pager Support
   
   Concepts:
   
    bundlespec    Bundle File Formats
    glossary      Glossary
    phases        Working with Phases
    subrepos      Subrepositories
   
   Miscellaneous:
   
    deprecated    Deprecated Features
    internals     Technical implementation topics
    scripting     Using Mercurial from scripts and automation
   
   (use 'hg help -v' to show built-in aliases and global options)
 
   $ hg -q help
   Repository creation:
   
    clone         make a copy of an existing repository
    init          create a new repository in the given directory
   
   Remote repository management:
   
    incoming      show new changesets found in source
    outgoing      show changesets not found in the destination
    paths         show aliases for remote repositories
    pull          pull changes from the specified source
    push          push changes to the specified destination
    serve         start stand-alone webserver
   
   Change creation:
   
    commit        commit the specified files or all outstanding changes
   
   Change manipulation:
   
    backout       reverse effect of earlier changeset
    graft         copy changes from other branches onto the current branch
    merge         merge another revision into working directory
   
   Change organization:
   
    bookmarks     create a new bookmark or list existing bookmarks
    branch        set or show the current branch name
    branches      list repository named branches
    phase         set or show the current phase name
    tag           add one or more tags for the current or given revision
    tags          list repository tags
   
   File content management:
   
    annotate      show changeset information by line for each file
    cat           output the current or given revision of files
    copy          mark files as copied for the next commit
    diff          diff repository (or selected files)
    grep          search for a pattern in specified files
   
   Change navigation:
   
    bisect        subdivision search of changesets
    heads         show branch heads
    identify      identify the working directory or specified revision
    log           show revision history of entire repository or files
   
   Working directory management:
   
    add           add the specified files on the next commit
    addremove     add all new files, delete all missing files
    files         list tracked files
    forget        forget the specified files on the next commit
    remove        remove the specified files on the next commit
    rename        rename files; equivalent of copy + remove
    resolve       redo merges or set/view the merge status of files
    revert        restore files to their checkout state
    root          print the root (top) of the current working directory
    shelve        save and set aside changes from the working directory
    status        show changed files in the working directory
    summary       summarize working directory state
    unshelve      restore a shelved change to the working directory
    update        update working directory (or switch revisions)
   
   Change import/export:
   
    archive       create an unversioned archive of a repository revision
    bundle        create a bundle file
    export        dump the header and diffs for one or more changesets
    import        import an ordered set of patches
    unbundle      apply one or more bundle files
   
   Repository maintenance:
   
    manifest      output the current or given revision of the project manifest
    recover       roll back an interrupted transaction
    verify        verify the integrity of the repository
   
   Help:
   
    config        show combined config settings from all hgrc files
    help          show help for a given topic or a help overview
    version       output version and copyright information
   
   additional help topics:
   
   Mercurial identifiers:
   
    filesets      Specifying File Sets
    hgignore      Syntax for Mercurial Ignore Files
    patterns      File Name Patterns
    revisions     Specifying Revisions
    urls          URL Paths
   
   Mercurial output:
   
    color         Colorizing Outputs
    dates         Date Formats
    diffs         Diff Formats
    templating    Template Usage
   
   Mercurial configuration:
   
    config        Configuration Files
    environment   Environment Variables
    extensions    Using Additional Features
    flags         Command-line flags
    hgweb         Configuring hgweb
    merge-tools   Merge Tools
    pager         Pager Support
   
   Concepts:
   
    bundlespec    Bundle File Formats
    glossary      Glossary
    phases        Working with Phases
    subrepos      Subrepositories
   
   Miscellaneous:
   
    deprecated    Deprecated Features
    internals     Technical implementation topics
    scripting     Using Mercurial from scripts and automation
 
 Test extension help:
   $ hg help extensions --config extensions.rebase= --config extensions.children=
   Using Additional Features
   """""""""""""""""""""""""
   
       Mercurial has the ability to add new features through the use of
       extensions. Extensions may add new commands, add options to existing
       commands, change the default behavior of commands, or implement hooks.
   
       To enable the "foo" extension, either shipped with Mercurial or in the
       Python search path, create an entry for it in your configuration file,
       like this:
   
         [extensions]
         foo =
   
       You may also specify the full path to an extension:
   
         [extensions]
         myfeature = ~/.hgext/myfeature.py
   
       See 'hg help config' for more information on configuration files.
   
       Extensions are not loaded by default for a variety of reasons: they can
       increase startup overhead; they may be meant for advanced usage only; they
       may provide potentially dangerous abilities (such as letting you destroy
       or modify history); they might not be ready for prime time; or they may
       alter some usual behaviors of stock Mercurial. It is thus up to the user
       to activate extensions as needed.
   
       To explicitly disable an extension enabled in a configuration file of
       broader scope, prepend its path with !:
   
         [extensions]
         # disabling extension bar residing in /path/to/extension/bar.py
         bar = !/path/to/extension/bar.py
         # ditto, but no path was supplied for extension baz
         baz = !
   
       enabled extensions:
   
        children      command to display child changesets (DEPRECATED)
        rebase        command to move sets of revisions to a different ancestor
   
       disabled extensions:
   
        acl           hooks for controlling repository access
        blackbox      log repository events to a blackbox for debugging
        bugzilla      hooks for integrating with the Bugzilla bug tracker
        censor        erase file content at a given revision
        churn         command to display statistics about repository history
        clonebundles  advertise pre-generated bundles to seed clones
        closehead     close arbitrary heads without checking them out first
        convert       import revisions from foreign VCS repositories into
                      Mercurial
        eol           automatically manage newlines in repository files
        extdiff       command to allow external programs to compare revisions
        factotum      http authentication with factotum
        fastexport    export repositories as git fast-import stream
        githelp       try mapping git commands to Mercurial commands
        gpg           commands to sign and verify changesets
        hgk           browse the repository in a graphical way
        highlight     syntax highlighting for hgweb (requires Pygments)
        histedit      interactive history editing
        keyword       expand keywords in tracked files
        largefiles    track large binary files
        mq            manage a stack of patches
        notify        hooks for sending email push notifications
        patchbomb     command to send changesets as (a series of) patch emails
        purge         command to delete untracked files from the working
                      directory
        relink        recreates hardlinks between repository clones
        schemes       extend schemes with shortcuts to repository swarms
        share         share a common history between several working directories
        strip         strip changesets and their descendants from history
        transplant    command to transplant changesets from another branch
        win32mbcs     allow the use of MBCS paths with problematic encodings
        zeroconf      discover and advertise repositories on the local network
 
 #endif
 
 Verify that deprecated extensions are included if --verbose:
 
   $ hg -v help extensions | grep children
        children      command to display child changesets (DEPRECATED)
 
 Verify that extension keywords appear in help templates
 
   $ hg help --config extensions.transplant= templating|grep transplant > /dev/null
 
 Test short command list with verbose option
 
   $ hg -v help shortlist
   Mercurial Distributed SCM
   
   basic commands:
   
    abort         abort an unfinished operation (EXPERIMENTAL)
    add           add the specified files on the next commit
    annotate, blame
                  show changeset information by line for each file
    clone         make a copy of an existing repository
    commit, ci    commit the specified files or all outstanding changes
    continue      resumes an interrupted operation (EXPERIMENTAL)
    diff          diff repository (or selected files)
    export        dump the header and diffs for one or more changesets
    forget        forget the specified files on the next commit
    init          create a new repository in the given directory
    log, history  show revision history of entire repository or files
    merge         merge another revision into working directory
    pull          pull changes from the specified source
    push          push changes to the specified destination
    remove, rm    remove the specified files on the next commit
    serve         start stand-alone webserver
    status, st    show changed files in the working directory
    summary, sum  summarize working directory state
    update, up, checkout, co
                  update working directory (or switch revisions)
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
   
   (use 'hg help' for the full list of commands)
 
   $ hg add -h
   hg add [OPTION]... [FILE]...
   
   add the specified files on the next commit
   
       Schedule files to be version controlled and added to the repository.
   
       The files will be added to the repository at the next commit. To undo an
       add before that, see 'hg forget'.
   
       If no names are given, add all files to the repository (except files
       matching ".hgignore").
   
       Returns 0 if all files are successfully added.
   
   options ([+] can be repeated):
   
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
    -n --dry-run             do not perform actions, just print output
   
   (some details hidden, use --verbose to show complete help)
 
 Verbose help for add
 
   $ hg add -hv
   hg add [OPTION]... [FILE]...
   
   add the specified files on the next commit
   
       Schedule files to be version controlled and added to the repository.
   
       The files will be added to the repository at the next commit. To undo an
       add before that, see 'hg forget'.
   
       If no names are given, add all files to the repository (except files
       matching ".hgignore").
   
       Examples:
   
         - New (unknown) files are added automatically by 'hg add':
   
             $ ls
             foo.c
             $ hg status
             ? foo.c
             $ hg add
             adding foo.c
             $ hg status
             A foo.c
   
         - Specific files to be added can be specified:
   
             $ ls
             bar.c  foo.c
             $ hg status
             ? bar.c
             ? foo.c
             $ hg add bar.c
             $ hg status
             A bar.c
             ? foo.c
   
       Returns 0 if all files are successfully added.
   
   options ([+] can be repeated):
   
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
    -n --dry-run             do not perform actions, just print output
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
 
 Test the textwidth config option
 
   $ hg root -h  --config ui.textwidth=50
   hg root
   
   print the root (top) of the current working
   directory
   
       Print the root directory of the current
       repository.
   
       Returns 0 on success.
   
   options:
   
    -T --template TEMPLATE display with template
   
   (some details hidden, use --verbose to show
   complete help)
 
 Test help option with version option
 
   $ hg add -h --version
   Mercurial Distributed SCM (version *) (glob)
   (see https://mercurial-scm.org for more information)
   
   Copyright (C) 2005-* Matt Mackall and others (glob)
   This is free software; see the source for copying conditions. There is NO
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
   $ hg add --skjdfks
   hg add: option --skjdfks not recognized
   hg add [OPTION]... [FILE]...
   
   add the specified files on the next commit
   
   options ([+] can be repeated):
   
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
    -n --dry-run             do not perform actions, just print output
   
   (use 'hg add -h' to show more help)
   [255]
 
 Test ambiguous command help
 
   $ hg help ad
   list of commands:
   
    add           add the specified files on the next commit
    addremove     add all new files, delete all missing files
   
   (use 'hg help -v ad' to show built-in aliases and global options)
 
 Test command without options
 
   $ hg help verify
   hg verify
   
   verify the integrity of the repository
   
       Verify the integrity of the current repository.
   
       This will perform an extensive check of the repository's integrity,
       validating the hashes and checksums of each entry in the changelog,
       manifest, and tracked files, as well as the integrity of their crosslinks
       and indices.
   
       Please see https://mercurial-scm.org/wiki/RepositoryCorruption for more
       information about recovery from corruption of the repository.
   
       Returns 0 on success, 1 if errors are encountered.
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg help diff
   hg diff [OPTION]... ([-c REV] | [-r REV1 [-r REV2]]) [FILE]...
   
   diff repository (or selected files)
   
       Show differences between revisions for the specified files.
   
       Differences between files are shown using the unified diff format.
   
       Note:
          'hg diff' may generate unexpected results for merges, as it will
          default to comparing against the working directory's first parent
          changeset if no revisions are specified.
   
       When two revision arguments are given, then changes are shown between
       those revisions. If only one revision is specified then that revision is
       compared to the working directory, and, when no revisions are specified,
       the working directory files are compared to its first parent.
   
       Alternatively you can specify -c/--change with a revision to see the
       changes in that changeset relative to its first parent.
   
       Without the -a/--text option, diff will avoid generating diffs of files it
       detects as binary. With -a, diff will generate a diff anyway, probably
       with undesirable results.
   
       Use the -g/--git option to generate diffs in the git extended diff format.
       For more information, read 'hg help diffs'.
   
       Returns 0 on success.
   
   options ([+] can be repeated):
   
    -r --rev REV [+]         revision
    -c --change REV          change made by revision
    -a --text                treat all files as text
    -g --git                 use git extended diff format
       --binary              generate binary diffs in git mode (default)
       --nodates             omit dates from diff headers
       --noprefix            omit a/ and b/ prefixes from filenames
    -p --show-function       show which function each change is in
       --reverse             produce a diff that undoes the changes
    -w --ignore-all-space    ignore white space when comparing lines
    -b --ignore-space-change ignore changes in the amount of white space
    -B --ignore-blank-lines  ignore changes whose lines are all blank
    -Z --ignore-space-at-eol ignore changes in whitespace at EOL
    -U --unified NUM         number of lines of context to show
       --stat                output diffstat-style summary of changes
       --root DIR            produce diffs relative to subdirectory
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg help status
   hg status [OPTION]... [FILE]...
   
   aliases: st
   
   show changed files in the working directory
   
       Show status of files in the repository. If names are given, only files
       that match are shown. Files that are clean or ignored or the source of a
       copy/move operation, are not listed unless -c/--clean, -i/--ignored,
       -C/--copies or -A/--all are given. Unless options described with "show
       only ..." are given, the options -mardu are used.
   
       Option -q/--quiet hides untracked (unknown and ignored) files unless
       explicitly requested with -u/--unknown or -i/--ignored.
   
       Note:
          'hg status' may appear to disagree with diff if permissions have
          changed or a merge has occurred. The standard diff format does not
          report permission changes and diff only reports changes relative to one
          merge parent.
   
       If one revision is given, it is used as the base revision. If two
       revisions are given, the differences between them are shown. The --change
       option can also be used as a shortcut to list the changed files of a
       revision from its first parent.
   
       The codes used to show the status of files are:
   
         M = modified
         A = added
         R = removed
         C = clean
         ! = missing (deleted by non-hg command, but still tracked)
         ? = not tracked
         I = ignored
           = origin of the previous file (with --copies)
   
       Returns 0 on success.
   
   options ([+] can be repeated):
   
    -A --all                 show status of all files
    -m --modified            show only modified files
    -a --added               show only added files
    -r --removed             show only removed files
    -d --deleted             show only deleted (but tracked) files
    -c --clean               show only files without changes
    -u --unknown             show only unknown (not tracked) files
    -i --ignored             show only ignored files
    -n --no-status           hide status prefix
    -C --copies              show source of copied files
    -0 --print0              end filenames with NUL, for use with xargs
       --rev REV [+]         show difference from revision
       --change REV          list the changed files of a revision
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
    -T --template TEMPLATE   display with template
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg -q help status
   hg status [OPTION]... [FILE]...
   
   show changed files in the working directory
 
   $ hg help foo
   abort: no such help topic: foo
   (try 'hg help --keyword foo')
   [255]
 
   $ hg skjdfks
   hg: unknown command 'skjdfks'
   (use 'hg help' for a list of commands)
   [255]
 
 Typoed command gives suggestion
   $ hg puls
   hg: unknown command 'puls'
   (did you mean one of pull, push?)
   [255]
 
 Not enabled extension gets suggested
 
   $ hg rebase
   hg: unknown command 'rebase'
   'rebase' is provided by the following extension:
   
       rebase        command to move sets of revisions to a different ancestor
   
   (use 'hg help extensions' for information on enabling extensions)
   [255]
 
 Disabled extension gets suggested
   $ hg --config extensions.rebase=! rebase
   hg: unknown command 'rebase'
   'rebase' is provided by the following extension:
   
       rebase        command to move sets of revisions to a different ancestor
   
   (use 'hg help extensions' for information on enabling extensions)
   [255]
 
+Checking that help adapts based on the config:
+
+  $ hg help diff --config ui.tweakdefaults=true | egrep -e '^ *(-g|config)'
+   -g --[no-]git            use git extended diff format (default: on from
+                            config)
+
 Make sure that we don't run afoul of the help system thinking that
 this is a section and erroring out weirdly.
 
   $ hg .log
   hg: unknown command '.log'
   (did you mean log?)
   [255]
 
   $ hg log.
   hg: unknown command 'log.'
   (did you mean log?)
   [255]
   $ hg pu.lh
   hg: unknown command 'pu.lh'
   (did you mean one of pull, push?)
   [255]
 
   $ cat > helpext.py <<EOF
   > import os
   > from mercurial import commands, fancyopts, registrar
   > 
   > def func(arg):
   >     return '%sfoo' % arg
   > class customopt(fancyopts.customopt):
   >     def newstate(self, oldstate, newparam, abort):
   >         return '%sbar' % oldstate
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > 
   > @command(b'nohelp',
   >     [(b'', b'longdesc', 3, b'x'*67),
   >     (b'n', b'', None, b'normal desc'),
   >     (b'', b'newline', b'', b'line1\nline2'),
   >     (b'', b'default-off', False, b'enable X'),
   >     (b'', b'default-on', True, b'enable Y'),
   >     (b'', b'callableopt', func, b'adds foo'),
   >     (b'', b'customopt', customopt(''), b'adds bar'),
   >     (b'', b'customopt-withdefault', customopt('foo'), b'adds bar')],
   >     b'hg nohelp',
   >     norepo=True)
   > @command(b'debugoptADV', [(b'', b'aopt', None, b'option is (ADVANCED)')])
   > @command(b'debugoptDEP', [(b'', b'dopt', None, b'option is (DEPRECATED)')])
   > @command(b'debugoptEXP', [(b'', b'eopt', None, b'option is (EXPERIMENTAL)')])
   > def nohelp(ui, *args, **kwargs):
   >     pass
   > 
   > @command(b'hashelp', [], b'hg hashelp', norepo=True)
   > def hashelp(ui, *args, **kwargs):
   >     """Extension command's help"""
   > 
   > def uisetup(ui):
   >     ui.setconfig(b'alias', b'shellalias', b'!echo hi', b'helpext')
   >     ui.setconfig(b'alias', b'hgalias', b'summary', b'helpext')
   >     ui.setconfig(b'alias', b'hgalias:doc', b'My doc', b'helpext')
   >     ui.setconfig(b'alias', b'hgalias:category', b'navigation', b'helpext')
   >     ui.setconfig(b'alias', b'hgaliasnodoc', b'summary', b'helpext')
   > 
   > EOF
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "helpext = `pwd`/helpext.py" >> $HGRCPATH
 
 Test for aliases
 
   $ hg help | grep hgalias
    hgalias       My doc
 
   $ hg help hgalias
   hg hgalias [--remote]
   
   alias for: hg summary
   
   My doc
   
   defined by: helpext
   
   options:
   
     --remote check for push and pull
   
   (some details hidden, use --verbose to show complete help)
   $ hg help hgaliasnodoc
   hg hgaliasnodoc [--remote]
   
   alias for: hg summary
   
   summarize working directory state
   
       This generates a brief summary of the working directory state, including
       parents, branch, commit status, phase and available updates.
   
       With the --remote option, this will check the default paths for incoming
       and outgoing changes. This can be time-consuming.
   
       Returns 0 on success.
   
   defined by: helpext
   
   options:
   
     --remote check for push and pull
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg help shellalias
   hg shellalias
   
   shell alias for: echo hi
   
   (no help text available)
   
   defined by: helpext
   
   (some details hidden, use --verbose to show complete help)
 
 Test command with no help text
 
   $ hg help nohelp
   hg nohelp
   
   (no help text available)
   
   options:
   
       --longdesc VALUE
                                     xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                                     xxxxxxxxxxxxxxxxxxxxxxx (default: 3)
    -n --                            normal desc
       --newline VALUE               line1 line2
       --default-off                 enable X
       --[no-]default-on             enable Y (default: on)
       --callableopt VALUE           adds foo
       --customopt VALUE             adds bar
       --customopt-withdefault VALUE adds bar (default: foo)
   
   (some details hidden, use --verbose to show complete help)
 
 Test that default list of commands includes extension commands that have help,
 but not those that don't, except in verbose mode, when a keyword is passed, or
 when help about the extension is requested.
 
 #if no-extraextensions
 
   $ hg help | grep hashelp
    hashelp       Extension command's help
   $ hg help | grep nohelp
   [1]
   $ hg help -v | grep nohelp
    nohelp        (no help text available)
 
   $ hg help -k nohelp
   Commands:
   
    nohelp hg nohelp
   
   Extension Commands:
   
    nohelp (no help text available)
 
   $ hg help helpext
   helpext extension - no help text available
   
   list of commands:
   
    hashelp       Extension command's help
    nohelp        (no help text available)
   
   (use 'hg help -v helpext' to show built-in aliases and global options)
 
 #endif
 
 Test list of internal help commands
 
   $ hg help debug
   debug commands (internal and unsupported):
   
    debugancestor
                  find the ancestor revision of two revisions in a given index
    debugapplystreamclonebundle
                  apply a stream clone bundle file
    debugbuilddag
                  builds a repo with a given DAG from scratch in the current
                  empty repo
    debugbundle   lists the contents of a bundle
    debugcapabilities
                  lists the capabilities of a remote peer
    debugcheckstate
                  validate the correctness of the current dirstate
    debugcolor    show available color, effects or style
    debugcommands
                  list all available commands and options
    debugcomplete
                  returns the completion list associated with the given command
    debugcreatestreamclonebundle
                  create a stream clone bundle file
    debugdag      format the changelog or an index DAG as a concise textual
                  description
    debugdata     dump the contents of a data file revision
    debugdate     parse and display a date
    debugdeltachain
                  dump information about delta chains in a revlog
    debugdirstate
                  show the contents of the current dirstate
    debugdiscovery
                  runs the changeset discovery protocol in isolation
    debugdownload
                  download a resource using Mercurial logic and config
    debugextensions
                  show information about active extensions
    debugfileset  parse and apply a fileset specification
    debugformat   display format information about the current repository
    debugfsinfo   show information detected about current filesystem
    debuggetbundle
                  retrieves a bundle from a repo
    debugignore   display the combined ignore pattern and information about
                  ignored files
    debugindex    dump index data for a storage primitive
    debugindexdot
                  dump an index DAG as a graphviz dot file
    debugindexstats
                  show stats related to the changelog index
    debuginstall  test Mercurial installation
    debugknown    test whether node ids are known to a repo
    debuglocks    show or modify state of locks
    debugmanifestfulltextcache
                  show, clear or amend the contents of the manifest fulltext
                  cache
    debugmergestate
                  print merge state
    debugnamecomplete
                  complete "names" - tags, open branch names, bookmark names
    debugobsolete
                  create arbitrary obsolete marker
    debugoptADV   (no help text available)
    debugoptDEP   (no help text available)
    debugoptEXP   (no help text available)
    debugp1copies
                  dump copy information compared to p1
    debugp2copies
                  dump copy information compared to p2
    debugpathcomplete
                  complete part or all of a tracked path
    debugpathcopies
                  show copies between two revisions
    debugpeer     establish a connection to a peer repository
    debugpickmergetool
                  examine which merge tool is chosen for specified file
    debugpushkey  access the pushkey key/value protocol
    debugpvec     (no help text available)
    debugrebuilddirstate
                  rebuild the dirstate as it would look like for the given
                  revision
    debugrebuildfncache
                  rebuild the fncache file
    debugrename   dump rename information
    debugrevlog   show data and statistics about a revlog
    debugrevlogindex
                  dump the contents of a revlog index
    debugrevspec  parse and apply a revision specification
    debugserve    run a server with advanced settings
    debugsetparents
                  manually set the parents of the current working directory
    debugsidedata
                  dump the side data for a cl/manifest/file revision
    debugssl      test a secure connection to a server
    debugsub      (no help text available)
    debugsuccessorssets
                  show set of successors for revision
    debugtagscache
                  display the contents of .hg/cache/hgtagsfnodes1
    debugtemplate
                  parse and apply a template
    debuguigetpass
                  show prompt to type password
    debuguiprompt
                  show plain prompt
    debugupdatecaches
                  warm all known caches in the repository
    debugupgraderepo
                  upgrade a repository to use different features
    debugwalk     show how files match on given patterns
    debugwhyunstable
                  explain instabilities of a changeset
    debugwireargs
                  (no help text available)
    debugwireproto
                  send wire protocol commands to a server
   
   (use 'hg help -v debug' to show built-in aliases and global options)
 
 internals topic renders index of available sub-topics
 
   $ hg help internals
   Technical implementation topics
   """""""""""""""""""""""""""""""
   
       To access a subtopic, use "hg help internals.{subtopic-name}"
   
        bundle2       Bundle2
        bundles       Bundles
        cbor          CBOR
        censor        Censor
        changegroups  Changegroups
        config        Config Registrar
        extensions    Extension API
        mergestate    Mergestate
        requirements  Repository Requirements
        revlogs       Revision Logs
        wireprotocol  Wire Protocol
        wireprotocolrpc
                      Wire Protocol RPC
        wireprotocolv2
                      Wire Protocol Version 2
 
 sub-topics can be accessed
 
   $ hg help internals.changegroups
   Changegroups
   """"""""""""
   
       Changegroups are representations of repository revlog data, specifically
       the changelog data, root/flat manifest data, treemanifest data, and
       filelogs.
   
       There are 3 versions of changegroups: "1", "2", and "3". From a high-
       level, versions "1" and "2" are almost exactly the same, with the only
       difference being an additional item in the *delta header*. Version "3"
       adds support for storage flags in the *delta header* and optionally
       exchanging treemanifests (enabled by setting an option on the
       "changegroup" part in the bundle2).
   
       Changegroups when not exchanging treemanifests consist of 3 logical
       segments:
   
         +---------------------------------+
         |           |          |          |
         | changeset | manifest | filelogs |
         |           |          |          |
         |           |          |          |
         +---------------------------------+
   
       When exchanging treemanifests, there are 4 logical segments:
   
         +-------------------------------------------------+
         |           |          |               |          |
         | changeset |   root   | treemanifests | filelogs |
         |           | manifest |               |          |
         |           |          |               |          |
         +-------------------------------------------------+
   
       The principle building block of each segment is a *chunk*. A *chunk* is a
       framed piece of data:
   
         +---------------------------------------+
         |           |                           |
         |  length   |           data            |
         | (4 bytes) |   (<length - 4> bytes)    |
         |           |                           |
         +---------------------------------------+
   
       All integers are big-endian signed integers. Each chunk starts with a
       32-bit integer indicating the length of the entire chunk (including the
       length field itself).
   
       There is a special case chunk that has a value of 0 for the length
       ("0x00000000"). We call this an *empty chunk*.
   
       Delta Groups
       ============
   
       A *delta group* expresses the content of a revlog as a series of deltas,
       or patches against previous revisions.
   
       Delta groups consist of 0 or more *chunks* followed by the *empty chunk*
       to signal the end of the delta group:
   
         +------------------------------------------------------------------------+
         |                |             |               |             |           |
         | chunk0 length  | chunk0 data | chunk1 length | chunk1 data |    0x0    |
         |   (4 bytes)    |  (various)  |   (4 bytes)   |  (various)  | (4 bytes) |
         |                |             |               |             |           |
         +------------------------------------------------------------------------+
   
       Each *chunk*'s data consists of the following:
   
         +---------------------------------------+
         |                        |              |
         |     delta header       |  delta data  |
         |  (various by version)  |  (various)   |
         |                        |              |
         +---------------------------------------+
   
       The *delta data* is a series of *delta*s that describe a diff from an
       existing entry (either that the recipient already has, or previously
       specified in the bundle/changegroup).
   
       The *delta header* is different between versions "1", "2", and "3" of the
       changegroup format.
   
       Version 1 (headerlen=80):
   
         +------------------------------------------------------+
         |            |             |             |             |
         |    node    |   p1 node   |   p2 node   |  link node  |
         | (20 bytes) |  (20 bytes) |  (20 bytes) |  (20 bytes) |
         |            |             |             |             |
         +------------------------------------------------------+
   
       Version 2 (headerlen=100):
   
         +------------------------------------------------------------------+
         |            |             |             |            |            |
         |    node    |   p1 node   |   p2 node   | base node  | link node  |
         | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) |
         |            |             |             |            |            |
         +------------------------------------------------------------------+
   
       Version 3 (headerlen=102):
   
         +------------------------------------------------------------------------------+
         |            |             |             |            |            |           |
         |    node    |   p1 node   |   p2 node   | base node  | link node  |   flags   |
         | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) | (2 bytes) |
         |            |             |             |            |            |           |
         +------------------------------------------------------------------------------+
   
       The *delta data* consists of "chunklen - 4 - headerlen" bytes, which
       contain a series of *delta*s, densely packed (no separators). These deltas
       describe a diff from an existing entry (either that the recipient already
       has, or previously specified in the bundle/changegroup). The format is
       described more fully in "hg help internals.bdiff", but briefly:
   
         +---------------------------------------------------------------+
         |              |            |            |                      |
         | start offset | end offset | new length |        content       |
         |  (4 bytes)   |  (4 bytes) |  (4 bytes) | (<new length> bytes) |
         |              |            |            |                      |
         +---------------------------------------------------------------+
   
       Please note that the length field in the delta data does *not* include
       itself.
   
       In version 1, the delta is always applied against the previous node from
       the changegroup or the first parent if this is the first entry in the
       changegroup.
   
       In version 2 and up, the delta base node is encoded in the entry in the
       changegroup. This allows the delta to be expressed against any parent,
       which can result in smaller deltas and more efficient encoding of data.
   
       The *flags* field holds bitwise flags affecting the processing of revision
       data. The following flags are defined:
   
       32768
          Censored revision. The revision's fulltext has been replaced by censor
          metadata. May only occur on file revisions.
   
       16384
          Ellipsis revision. Revision hash does not match data (likely due to
          rewritten parents).
   
       8192
          Externally stored. The revision fulltext contains "key:value" "\n"
          delimited metadata defining an object stored elsewhere. Used by the LFS
          extension.
   
       For historical reasons, the integer values are identical to revlog version
       1 per-revision storage flags and correspond to bits being set in this
       2-byte field. Bits were allocated starting from the most-significant bit,
       hence the reverse ordering and allocation of these flags.
   
       Changeset Segment
       =================
   
       The *changeset segment* consists of a single *delta group* holding
       changelog data. The *empty chunk* at the end of the *delta group* denotes
       the boundary to the *manifest segment*.
   
       Manifest Segment
       ================
   
       The *manifest segment* consists of a single *delta group* holding manifest
       data. If treemanifests are in use, it contains only the manifest for the
       root directory of the repository. Otherwise, it contains the entire
       manifest data. The *empty chunk* at the end of the *delta group* denotes
       the boundary to the next segment (either the *treemanifests segment* or
       the *filelogs segment*, depending on version and the request options).
   
       Treemanifests Segment
       ---------------------
   
       The *treemanifests segment* only exists in changegroup version "3", and
       only if the 'treemanifest' param is part of the bundle2 changegroup part
       (it is not possible to use changegroup version 3 outside of bundle2).
       Aside from the filenames in the *treemanifests segment* containing a
       trailing "/" character, it behaves identically to the *filelogs segment*
       (see below). The final sub-segment is followed by an *empty chunk*
       (logically, a sub-segment with filename size 0). This denotes the boundary
       to the *filelogs segment*.
   
       Filelogs Segment
       ================
   
       The *filelogs segment* consists of multiple sub-segments, each
       corresponding to an individual file whose data is being described:
   
         +--------------------------------------------------+
         |          |          |          |     |           |
         | filelog0 | filelog1 | filelog2 | ... |    0x0    |
         |          |          |          |     | (4 bytes) |
         |          |          |          |     |           |
         +--------------------------------------------------+
   
       The final filelog sub-segment is followed by an *empty chunk* (logically,
       a sub-segment with filename size 0). This denotes the end of the segment
       and of the overall changegroup.
   
       Each filelog sub-segment consists of the following:
   
         +------------------------------------------------------+
         |                 |                      |             |
         | filename length |       filename       | delta group |
         |    (4 bytes)    | (<length - 4> bytes) |  (various)  |
         |                 |                      |             |
         +------------------------------------------------------+
   
       That is, a *chunk* consisting of the filename (not terminated or padded)
       followed by N chunks constituting the *delta group* for this file. The
       *empty chunk* at the end of each *delta group* denotes the boundary to the
       next filelog sub-segment.
 
 non-existent subtopics print an error
 
   $ hg help internals.foo
   abort: no such help topic: internals.foo
   (try 'hg help --keyword foo')
   [255]
 
 test advanced, deprecated and experimental options are hidden in command help
   $ hg help debugoptADV
   hg debugoptADV
   
   (no help text available)
   
   options:
   
   (some details hidden, use --verbose to show complete help)
   $ hg help debugoptDEP
   hg debugoptDEP
   
   (no help text available)
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg help debugoptEXP
   hg debugoptEXP
   
   (no help text available)
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 
 test advanced, deprecated and experimental options are shown with -v
   $ hg help -v debugoptADV | grep aopt
     --aopt option is (ADVANCED)
   $ hg help -v debugoptDEP | grep dopt
     --dopt option is (DEPRECATED)
   $ hg help -v debugoptEXP | grep eopt
     --eopt option is (EXPERIMENTAL)
 
 #if gettext
 test deprecated option is hidden with translation with untranslated description
 (use many globy for not failing on changed transaction)
   $ LANGUAGE=sv hg help debugoptDEP
   hg debugoptDEP
   
   (*) (glob)
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 #endif
 
 Test commands that collide with topics (issue4240)
 
   $ hg config -hq
   hg config [-u] [NAME]...
   
   show combined config settings from all hgrc files
   $ hg showconfig -hq
   hg config [-u] [NAME]...
   
   show combined config settings from all hgrc files
 
 Test a help topic
 
   $ hg help dates
   Date Formats
   """"""""""""
   
       Some commands allow the user to specify a date, e.g.:
   
       - backout, commit, import, tag: Specify the commit date.
       - log, revert, update: Select revision(s) by date.
   
       Many date formats are valid. Here are some examples:
   
       - "Wed Dec 6 13:18:29 2006" (local timezone assumed)
       - "Dec 6 13:18 -0600" (year assumed, time offset provided)
       - "Dec 6 13:18 UTC" (UTC and GMT are aliases for +0000)
       - "Dec 6" (midnight)
       - "13:18" (today assumed)
       - "3:39" (3:39AM assumed)
       - "3:39pm" (15:39)
       - "2006-12-06 13:18:29" (ISO 8601 format)
       - "2006-12-6 13:18"
       - "2006-12-6"
       - "12-6"
       - "12/6"
       - "12/6/6" (Dec 6 2006)
       - "today" (midnight)
       - "yesterday" (midnight)
       - "now" - right now
   
       Lastly, there is Mercurial's internal format:
   
       - "1165411109 0" (Wed Dec 6 13:18:29 2006 UTC)
   
       This is the internal representation format for dates. The first number is
       the number of seconds since the epoch (1970-01-01 00:00 UTC). The second
       is the offset of the local timezone, in seconds west of UTC (negative if
       the timezone is east of UTC).
   
       The log command also accepts date ranges:
   
       - "<DATE" - at or before a given date/time
       - ">DATE" - on or after a given date/time
       - "DATE to DATE" - a date range, inclusive
       - "-DAYS" - within a given number of days of today
 
 Test repeated config section name
 
   $ hg help config.host
       "http_proxy.host"
           Host name and (optional) port of the proxy server, for example
           "myproxy:8000".
   
       "smtp.host"
           Host name of mail server, e.g. "mail.example.com".
   
 
 Test section name with dot
 
   $ hg help config.ui.username
       "ui.username"
           The committer of a changeset created when running "commit". Typically
           a person's name and email address, e.g. "Fred Widget
           <[e-mail]>". Environment variables in the username are
           expanded.
   
           (default: "$EMAIL" or "username@hostname". If the username in hgrc is
           empty, e.g. if the system admin set "username =" in the system hgrc,
           it has to be specified manually or in a different hgrc file)
   
 
   $ hg help config.annotate.git
   abort: help section not found: config.annotate.git
   [255]
 
   $ hg help config.update.check
       "commands.update.check"
           Determines what level of checking 'hg update' will perform before
           moving to a destination revision. Valid values are "abort", "none",
           "linear", and "noconflict". "abort" always fails if the working
           directory has uncommitted changes. "none" performs no checking, and
           may result in a merge with uncommitted changes. "linear" allows any
           update as long as it follows a straight line in the revision history,
           and may trigger a merge with uncommitted changes. "noconflict" will
           allow any update which would not trigger a merge with uncommitted
           changes, if any are present. (default: "linear")
   
 
   $ hg help config.commands.update.check
       "commands.update.check"
           Determines what level of checking 'hg update' will perform before
           moving to a destination revision. Valid values are "abort", "none",
           "linear", and "noconflict". "abort" always fails if the working
           directory has uncommitted changes. "none" performs no checking, and
           may result in a merge with uncommitted changes. "linear" allows any
           update as long as it follows a straight line in the revision history,
           and may trigger a merge with uncommitted changes. "noconflict" will
           allow any update which would not trigger a merge with uncommitted
           changes, if any are present. (default: "linear")
   
 
   $ hg help config.ommands.update.check
   abort: help section not found: config.ommands.update.check
   [255]
 
 Unrelated trailing paragraphs shouldn't be included
 
   $ hg help config.extramsg | grep '^$'
   
 
 Test capitalized section name
 
   $ hg help scripting.HGPLAIN > /dev/null
 
 Help subsection:
 
   $ hg help config.charsets |grep "Email example:" > /dev/null
   [1]
 
 Show nested definitions
 ("profiling.type"[break]"ls"[break]"stat"[break])
 
   $ hg help config.type | egrep '^$'|wc -l
   \s*3 (re)
 
   $ hg help config.profiling.type.ls
           "profiling.type.ls"
             Use Python's built-in instrumenting profiler. This profiler works on
             all platforms, but each line number it reports is the first line of
             a function. This restriction makes it difficult to identify the
             expensive parts of a non-trivial function.
   
 
 Separate sections from subsections
 
   $ hg help config.format | egrep '^    ("|-)|^\s*$' | uniq
       "format"
       --------
   
       "usegeneraldelta"
   
       "dotencode"
   
       "usefncache"
   
       "usestore"
   
       "sparse-revlog"
   
       "revlog-compression"
   
       "bookmarks-in-store"
   
       "profiling"
       -----------
   
       "format"
   
       "progress"
       ----------
   
       "format"
   
 
 Last item in help config.*:
 
   $ hg help config.`hg help config|grep '^    "'| \
   >       tail -1|sed 's![ "]*!!g'`| \
   >   grep 'hg help -c config' > /dev/null
   [1]
 
 note to use help -c for general hg help config:
 
   $ hg help config |grep 'hg help -c config' > /dev/null
 
 Test templating help
 
   $ hg help templating | egrep '(desc|diffstat|firstline|nonempty)  '
       desc          String. The text of the changeset description.
       diffstat      String. Statistics of changes with the following format:
       firstline     Any text. Returns the first line of text.
       nonempty      Any text. Returns '(none)' if the string is empty.
 
 Test deprecated items
 
   $ hg help -v templating | grep currentbookmark
       currentbookmark
   $ hg help templating | (grep currentbookmark || true)
 
 Test help hooks
 
   $ cat > helphook1.py <<EOF
   > from mercurial import help
   > 
   > def rewrite(ui, topic, doc):
   >     return doc + b'\nhelphook1\n'
   > 
   > def extsetup(ui):
   >     help.addtopichook(b'revisions', rewrite)
   > EOF
   $ cat > helphook2.py <<EOF
   > from mercurial import help
   > 
   > def rewrite(ui, topic, doc):
   >     return doc + b'\nhelphook2\n'
   > 
   > def extsetup(ui):
   >     help.addtopichook(b'revisions', rewrite)
   > EOF
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "helphook1 = `pwd`/helphook1.py" >> $HGRCPATH
   $ echo "helphook2 = `pwd`/helphook2.py" >> $HGRCPATH
   $ hg help revsets | grep helphook
       helphook1
       helphook2
 
 help -c should only show debug --debug
 
   $ hg help -c --debug|egrep debug|wc -l|egrep '^\s*0\s*$'
   [1]
 
 help -c should only show deprecated for -v
 
   $ hg help -c -v|egrep DEPRECATED|wc -l|egrep '^\s*0\s*$'
   [1]
 
 Test -s / --system
 
   $ hg help config.files -s windows |grep 'etc/mercurial' | \
   > wc -l | sed -e 's/ //g'
   0
   $ hg help config.files --system unix | grep 'USER' | \
   > wc -l | sed -e 's/ //g'
   0
 
 Test -e / -c / -k combinations
 
   $ hg help -c|egrep '^[A-Z].*:|^ debug'
   Commands:
   $ hg help -e|egrep '^[A-Z].*:|^ debug'
   Extensions:
   $ hg help -k|egrep '^[A-Z].*:|^ debug'
   Topics:
   Commands:
   Extensions:
   Extension Commands:
   $ hg help -c schemes
   abort: no such help topic: schemes
   (try 'hg help --keyword schemes')
   [255]
   $ hg help -e schemes |head -1
   schemes extension - extend schemes with shortcuts to repository swarms
   $ hg help -c -k dates |egrep '^(Topics|Extensions|Commands):'
   Commands:
   $ hg help -e -k a |egrep '^(Topics|Extensions|Commands):'
   Extensions:
   $ hg help -e -c -k date |egrep '^(Topics|Extensions|Commands):'
   Extensions:
   Commands:
   $ hg help -c commit > /dev/null
   $ hg help -e -c commit > /dev/null
   $ hg help -e commit
   abort: no such help topic: commit
   (try 'hg help --keyword commit')
   [255]
 
 Test keyword search help
 
   $ cat > prefixedname.py <<EOF
   > '''matched against word "clone"
   > '''
   > EOF
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "dot.dot.prefixedname = `pwd`/prefixedname.py" >> $HGRCPATH
   $ hg help -k clone
   Topics:
   
    config     Configuration Files
    extensions Using Additional Features
    glossary   Glossary
    phases     Working with Phases
    subrepos   Subrepositories
    urls       URL Paths
   
   Commands:
   
    bookmarks create a new bookmark or list existing bookmarks
    clone     make a copy of an existing repository
    paths     show aliases for remote repositories
    pull      pull changes from the specified source
    update    update working directory (or switch revisions)
   
   Extensions:
   
    clonebundles advertise pre-generated bundles to seed clones
    narrow       create clones which fetch history data for subset of files
                 (EXPERIMENTAL)
    prefixedname matched against word "clone"
    relink       recreates hardlinks between repository clones
   
   Extension Commands:
   
    qclone clone main and patch repository at same time
 
 Test unfound topic
 
   $ hg help nonexistingtopicthatwillneverexisteverever
   abort: no such help topic: nonexistingtopicthatwillneverexisteverever
   (try 'hg help --keyword nonexistingtopicthatwillneverexisteverever')
   [255]
 
 Test unfound keyword
 
   $ hg help --keyword nonexistingwordthatwillneverexisteverever
   abort: no matches
   (try 'hg help' for a list of topics)
   [255]
 
 Test omit indicating for help
 
   $ cat > addverboseitems.py <<EOF
   > r'''extension to test omit indicating.
   > 
   > This paragraph is never omitted (for extension)
   > 
   > .. container:: verbose
   > 
   >   This paragraph is omitted,
   >   if :hg:\`help\` is invoked without \`\`-v\`\` (for extension)
   > 
   > This paragraph is never omitted, too (for extension)
   > '''
   > from __future__ import absolute_import
   > from mercurial import commands, help
   > testtopic = br"""This paragraph is never omitted (for topic).
   > 
   > .. container:: verbose
   > 
   >   This paragraph is omitted,
   >   if :hg:\`help\` is invoked without \`\`-v\`\` (for topic)
   > 
   > This paragraph is never omitted, too (for topic)
   > """
   > def extsetup(ui):
   >     help.helptable.append(([b"topic-containing-verbose"],
   >                            b"This is the topic to test omit indicating.",
   >                            lambda ui: testtopic))
   > EOF
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "addverboseitems = `pwd`/addverboseitems.py" >> $HGRCPATH
   $ hg help addverboseitems
   addverboseitems extension - extension to test omit indicating.
   
   This paragraph is never omitted (for extension)
   
   This paragraph is never omitted, too (for extension)
   
   (some details hidden, use --verbose to show complete help)
   
   no commands defined
   $ hg help -v addverboseitems
   addverboseitems extension - extension to test omit indicating.
   
   This paragraph is never omitted (for extension)
   
   This paragraph is omitted, if 'hg help' is invoked without "-v" (for
   extension)
   
   This paragraph is never omitted, too (for extension)
   
   no commands defined
   $ hg help topic-containing-verbose
   This is the topic to test omit indicating.
   """"""""""""""""""""""""""""""""""""""""""
   
       This paragraph is never omitted (for topic).
   
       This paragraph is never omitted, too (for topic)
   
   (some details hidden, use --verbose to show complete help)
   $ hg help -v topic-containing-verbose
   This is the topic to test omit indicating.
   """"""""""""""""""""""""""""""""""""""""""
   
       This paragraph is never omitted (for topic).
   
       This paragraph is omitted, if 'hg help' is invoked without "-v" (for
       topic)
   
       This paragraph is never omitted, too (for topic)
 
 Test section lookup
 
   $ hg help revset.merge
       "merge()"
         Changeset is a merge changeset.
   
   $ hg help glossary.dag
       DAG
           The repository of changesets of a distributed version control system
           (DVCS) can be described as a directed acyclic graph (DAG), consisting
           of nodes and edges, where nodes correspond to changesets and edges
           imply a parent -> child relation. This graph can be visualized by
           graphical tools such as 'hg log --graph'. In Mercurial, the DAG is
           limited by the requirement for children to have at most two parents.
   
 
   $ hg help hgrc.paths
       "paths"
       -------
   
       Assigns symbolic names and behavior to repositories.
   
       Options are symbolic names defining the URL or directory that is the
       location of the repository. Example:
   
         [paths]
         my_server = https://example.com/my_repo
         local_path = /home/me/repo
   
       These symbolic names can be used from the command line. To pull from
       "my_server": 'hg pull my_server'. To push to "local_path": 'hg push
       local_path'.
   
       Options containing colons (":") denote sub-options that can influence
       behavior for that specific path. Example:
   
         [paths]
         my_server = https://example.com/my_path
         my_server:pushurl = ssh://example.com/my_path
   
       The following sub-options can be defined:
   
       "pushurl"
          The URL to use for push operations. If not defined, the location
          defined by the path's main entry is used.
   
       "pushrev"
          A revset defining which revisions to push by default.
   
          When 'hg push' is executed without a "-r" argument, the revset defined
          by this sub-option is evaluated to determine what to push.
   
          For example, a value of "." will push the working directory's revision
          by default.
   
          Revsets specifying bookmarks will not result in the bookmark being
          pushed.
   
       The following special named paths exist:
   
       "default"
          The URL or directory to use when no source or remote is specified.
   
          'hg clone' will automatically define this path to the location the
          repository was cloned from.
   
       "default-push"
          (deprecated) The URL or directory for the default 'hg push' location.
          "default:pushurl" should be used instead.
   
   $ hg help glossary.mcguffin
   abort: help section not found: glossary.mcguffin
   [255]
 
   $ hg help glossary.mc.guffin
   abort: help section not found: glossary.mc.guffin
   [255]
 
   $ hg help template.files
       files         List of strings. All files modified, added, or removed by
                     this changeset.
       files(pattern)
                     All files of the current changeset matching the pattern. See
                     'hg help patterns'.
 
 Test section lookup by translated message
 
 str.lower() instead of encoding.lower(str) on translated message might
 make message meaningless, because some encoding uses 0x41(A) - 0x5a(Z)
 as the second or later byte of multi-byte character.
 
 For example, "\x8bL\x98^" (translation of "record" in ja_JP.cp932)
 contains 0x4c (L). str.lower() replaces 0x4c(L) by 0x6c(l) and this
 replacement makes message meaningless.
 
 This tests that section lookup by translated string isn't broken by
 such str.lower().
 
   $ "$PYTHON" <<EOF
   > def escape(s):
   >     return b''.join(b'\\u%x' % ord(uc) for uc in s.decode('cp932'))
   > # translation of "record" in ja_JP.cp932
   > upper = b"\x8bL\x98^"
   > # str.lower()-ed section name should be treated as different one
   > lower = b"\x8bl\x98^"
   > with open('ambiguous.py', 'wb') as fp:
   >     fp.write(b"""# ambiguous section names in ja_JP.cp932
   > u'''summary of extension
   > 
   > %s
   > ----
   > 
   > Upper name should show only this message
   > 
   > %s
   > ----
   > 
   > Lower name should show only this message
   > 
   > subsequent section
   > ------------------
   > 
   > This should be hidden at 'hg help ambiguous' with section name.
   > '''
   > """ % (escape(upper), escape(lower)))
   > EOF
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > ambiguous = ./ambiguous.py
   > EOF
 
   $ "$PYTHON" <<EOF | sh
   > from mercurial import pycompat
   > upper = b"\x8bL\x98^"
   > pycompat.stdout.write(b"hg --encoding cp932 help -e ambiguous.%s\n" % upper)
   > EOF
   \x8bL\x98^ (esc)
   ----
   
   Upper name should show only this message
   
 
   $ "$PYTHON" <<EOF | sh
   > from mercurial import pycompat
   > lower = b"\x8bl\x98^"
   > pycompat.stdout.write(b"hg --encoding cp932 help -e ambiguous.%s\n" % lower)
   > EOF
   \x8bl\x98^ (esc)
   ----
   
   Lower name should show only this message
   
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > ambiguous = !
   > EOF
 
 Show help content of disabled extensions
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > ambiguous = !./ambiguous.py
   > EOF
   $ hg help -e ambiguous
   ambiguous extension - (no help text available)
   
   (use 'hg help extensions' for information on enabling extensions)
 
 Test dynamic list of merge tools only shows up once
   $ hg help merge-tools
   Merge Tools
   """""""""""
   
       To merge files Mercurial uses merge tools.
   
       A merge tool combines two different versions of a file into a merged file.
       Merge tools are given the two files and the greatest common ancestor of
       the two file versions, so they can determine the changes made on both
       branches.
   
       Merge tools are used both for 'hg resolve', 'hg merge', 'hg update', 'hg
       backout' and in several extensions.
   
       Usually, the merge tool tries to automatically reconcile the files by
       combining all non-overlapping changes that occurred separately in the two
       different evolutions of the same initial base file. Furthermore, some
       interactive merge programs make it easier to manually resolve conflicting
       merges, either in a graphical way, or by inserting some conflict markers.
       Mercurial does not include any interactive merge programs but relies on
       external tools for that.
   
       Available merge tools
       =====================
   
       External merge tools and their properties are configured in the merge-
       tools configuration section - see hgrc(5) - but they can often just be
       named by their executable.
   
       A merge tool is generally usable if its executable can be found on the
       system and if it can handle the merge. The executable is found if it is an
       absolute or relative executable path or the name of an application in the
       executable search path. The tool is assumed to be able to handle the merge
       if it can handle symlinks if the file is a symlink, if it can handle
       binary files if the file is binary, and if a GUI is available if the tool
       requires a GUI.
   
       There are some internal merge tools which can be used. The internal merge
       tools are:
   
       ":dump"
         Creates three versions of the files to merge, containing the contents of
         local, other and base. These files can then be used to perform a merge
         manually. If the file to be merged is named "a.txt", these files will
         accordingly be named "a.txt.local", "a.txt.other" and "a.txt.base" and
         they will be placed in the same directory as "a.txt".
   
         This implies premerge. Therefore, files aren't dumped, if premerge runs
         successfully. Use :forcedump to forcibly write files out.
   
         (actual capabilities: binary, symlink)
   
       ":fail"
         Rather than attempting to merge files that were modified on both
         branches, it marks them as unresolved. The resolve command must be used
         to resolve these conflicts.
   
         (actual capabilities: binary, symlink)
   
       ":forcedump"
         Creates three versions of the files as same as :dump, but omits
         premerge.
   
         (actual capabilities: binary, symlink)
   
       ":local"
         Uses the local 'p1()' version of files as the merged version.
   
         (actual capabilities: binary, symlink)
   
       ":merge"
         Uses the internal non-interactive simple merge algorithm for merging
         files. It will fail if there are any conflicts and leave markers in the
         partially merged file. Markers will have two sections, one for each side
         of merge.
   
       ":merge-local"
         Like :merge, but resolve all conflicts non-interactively in favor of the
         local 'p1()' changes.
   
       ":merge-other"
         Like :merge, but resolve all conflicts non-interactively in favor of the
         other 'p2()' changes.
   
       ":merge3"
         Uses the internal non-interactive simple merge algorithm for merging
         files. It will fail if there are any conflicts and leave markers in the
         partially merged file. Marker will have three sections, one from each
         side of the merge and one for the base content.
   
       ":other"
         Uses the other 'p2()' version of files as the merged version.
   
         (actual capabilities: binary, symlink)
   
       ":prompt"
         Asks the user which of the local 'p1()' or the other 'p2()' version to
         keep as the merged version.
   
         (actual capabilities: binary, symlink)
   
       ":tagmerge"
         Uses the internal tag merge algorithm (experimental).
   
       ":union"
         Uses the internal non-interactive simple merge algorithm for merging
         files. It will use both left and right sides for conflict regions. No
         markers are inserted.
   
       Internal tools are always available and do not require a GUI but will by
       default not handle symlinks or binary files. See next section for detail
       about "actual capabilities" described above.
   
       Choosing a merge tool
       =====================
   
       Mercurial uses these rules when deciding which merge tool to use:
   
       1. If a tool has been specified with the --tool option to merge or
          resolve, it is used.  If it is the name of a tool in the merge-tools
          configuration, its configuration is used. Otherwise the specified tool
          must be executable by the shell.
       2. If the "HGMERGE" environment variable is present, its value is used and
          must be executable by the shell.
       3. If the filename of the file to be merged matches any of the patterns in
          the merge-patterns configuration section, the first usable merge tool
          corresponding to a matching pattern is used.
       4. If ui.merge is set it will be considered next. If the value is not the
          name of a configured tool, the specified value is used and must be
          executable by the shell. Otherwise the named tool is used if it is
          usable.
       5. If any usable merge tools are present in the merge-tools configuration
          section, the one with the highest priority is used.
       6. If a program named "hgmerge" can be found on the system, it is used -
          but it will by default not be used for symlinks and binary files.
       7. If the file to be merged is not binary and is not a symlink, then
          internal ":merge" is used.
       8. Otherwise, ":prompt" is used.
   
       For historical reason, Mercurial treats merge tools as below while
       examining rules above.
   
       step specified via  binary symlink
       ----------------------------------
       1.   --tool         o/o    o/o
       2.   HGMERGE        o/o    o/o
       3.   merge-patterns o/o(*) x/?(*)
       4.   ui.merge       x/?(*) x/?(*)
   
       Each capability column indicates Mercurial behavior for internal/external
       merge tools at examining each rule.
   
       - "o": "assume that a tool has capability"
       - "x": "assume that a tool does not have capability"
       - "?": "check actual capability of a tool"
   
       If "merge.strict-capability-check" configuration is true, Mercurial checks
       capabilities of merge tools strictly in (*) cases above (= each capability
       column becomes "?/?"). It is false by default for backward compatibility.
   
       Note:
          After selecting a merge program, Mercurial will by default attempt to
          merge the files using a simple merge algorithm first. Only if it
          doesn't succeed because of conflicting changes will Mercurial actually
          execute the merge program. Whether to use the simple merge algorithm
          first can be controlled by the premerge setting of the merge tool.
          Premerge is enabled by default unless the file is binary or a symlink.
   
       See the merge-tools and ui sections of hgrc(5) for details on the
       configuration of merge tools.
 
 Compression engines listed in `hg help bundlespec`
 
   $ hg help bundlespec | grep gzip
           "v1" bundles can only use the "gzip", "bzip2", and "none" compression
         An algorithm that produces smaller bundles than "gzip".
         This engine will likely produce smaller bundles than "gzip" but will be
       "gzip"
         better compression than "gzip". It also frequently yields better (?)
 
 Test usage of section marks in help documents
 
   $ cd "$TESTDIR"/../doc
   $ "$PYTHON" check-seclevel.py
   $ cd $TESTTMP
 
 #if serve
 
 Test the help pages in hgweb.
 
 Dish up an empty repo; serve it cold.
 
   $ hg init "$TESTTMP/test"
   $ hg serve -R "$TESTTMP/test" -n test -p $HGPORT -d --pid-file=hg.pid
   $ cat hg.pid >> $DAEMON_PIDS
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: Index</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
   <li class="active">help</li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <table class="bigtable">
   <tr><td colspan="2"><h2><a name="topics" href="#topics">Topics</a></h2></td></tr>
   
   <tr><td>
   <a href="/help/bundlespec">
   bundlespec
   </a>
   </td><td>
   Bundle File Formats
   </td></tr>
   <tr><td>
   <a href="/help/color">
   color
   </a>
   </td><td>
   Colorizing Outputs
   </td></tr>
   <tr><td>
   <a href="/help/config">
   config
   </a>
   </td><td>
   Configuration Files
   </td></tr>
   <tr><td>
   <a href="/help/dates">
   dates
   </a>
   </td><td>
   Date Formats
   </td></tr>
   <tr><td>
   <a href="/help/deprecated">
   deprecated
   </a>
   </td><td>
   Deprecated Features
   </td></tr>
   <tr><td>
   <a href="/help/diffs">
   diffs
   </a>
   </td><td>
   Diff Formats
   </td></tr>
   <tr><td>
   <a href="/help/environment">
   environment
   </a>
   </td><td>
   Environment Variables
   </td></tr>
   <tr><td>
   <a href="/help/extensions">
   extensions
   </a>
   </td><td>
   Using Additional Features
   </td></tr>
   <tr><td>
   <a href="/help/filesets">
   filesets
   </a>
   </td><td>
   Specifying File Sets
   </td></tr>
   <tr><td>
   <a href="/help/flags">
   flags
   </a>
   </td><td>
   Command-line flags
   </td></tr>
   <tr><td>
   <a href="/help/glossary">
   glossary
   </a>
   </td><td>
   Glossary
   </td></tr>
   <tr><td>
   <a href="/help/hgignore">
   hgignore
   </a>
   </td><td>
   Syntax for Mercurial Ignore Files
   </td></tr>
   <tr><td>
   <a href="/help/hgweb">
   hgweb
   </a>
   </td><td>
   Configuring hgweb
   </td></tr>
   <tr><td>
   <a href="/help/internals">
   internals
   </a>
   </td><td>
   Technical implementation topics
   </td></tr>
   <tr><td>
   <a href="/help/merge-tools">
   merge-tools
   </a>
   </td><td>
   Merge Tools
   </td></tr>
   <tr><td>
   <a href="/help/pager">
   pager
   </a>
   </td><td>
   Pager Support
   </td></tr>
   <tr><td>
   <a href="/help/patterns">
   patterns
   </a>
   </td><td>
   File Name Patterns
   </td></tr>
   <tr><td>
   <a href="/help/phases">
   phases
   </a>
   </td><td>
   Working with Phases
   </td></tr>
   <tr><td>
   <a href="/help/revisions">
   revisions
   </a>
   </td><td>
   Specifying Revisions
   </td></tr>
   <tr><td>
   <a href="/help/scripting">
   scripting
   </a>
   </td><td>
   Using Mercurial from scripts and automation
   </td></tr>
   <tr><td>
   <a href="/help/subrepos">
   subrepos
   </a>
   </td><td>
   Subrepositories
   </td></tr>
   <tr><td>
   <a href="/help/templating">
   templating
   </a>
   </td><td>
   Template Usage
   </td></tr>
   <tr><td>
   <a href="/help/urls">
   urls
   </a>
   </td><td>
   URL Paths
   </td></tr>
   <tr><td>
   <a href="/help/topic-containing-verbose">
   topic-containing-verbose
   </a>
   </td><td>
   This is the topic to test omit indicating.
   </td></tr>
   
   
   <tr><td colspan="2"><h2><a name="main" href="#main">Main Commands</a></h2></td></tr>
   
   <tr><td>
   <a href="/help/abort">
   abort
   </a>
   </td><td>
   abort an unfinished operation (EXPERIMENTAL)
   </td></tr>
   <tr><td>
   <a href="/help/add">
   add
   </a>
   </td><td>
   add the specified files on the next commit
   </td></tr>
   <tr><td>
   <a href="/help/annotate">
   annotate
   </a>
   </td><td>
   show changeset information by line for each file
   </td></tr>
   <tr><td>
   <a href="/help/clone">
   clone
   </a>
   </td><td>
   make a copy of an existing repository
   </td></tr>
   <tr><td>
   <a href="/help/commit">
   commit
   </a>
   </td><td>
   commit the specified files or all outstanding changes
   </td></tr>
   <tr><td>
   <a href="/help/continue">
   continue
   </a>
   </td><td>
   resumes an interrupted operation (EXPERIMENTAL)
   </td></tr>
   <tr><td>
   <a href="/help/diff">
   diff
   </a>
   </td><td>
   diff repository (or selected files)
   </td></tr>
   <tr><td>
   <a href="/help/export">
   export
   </a>
   </td><td>
   dump the header and diffs for one or more changesets
   </td></tr>
   <tr><td>
   <a href="/help/forget">
   forget
   </a>
   </td><td>
   forget the specified files on the next commit
   </td></tr>
   <tr><td>
   <a href="/help/init">
   init
   </a>
   </td><td>
   create a new repository in the given directory
   </td></tr>
   <tr><td>
   <a href="/help/log">
   log
   </a>
   </td><td>
   show revision history of entire repository or files
   </td></tr>
   <tr><td>
   <a href="/help/merge">
   merge
   </a>
   </td><td>
   merge another revision into working directory
   </td></tr>
   <tr><td>
   <a href="/help/pull">
   pull
   </a>
   </td><td>
   pull changes from the specified source
   </td></tr>
   <tr><td>
   <a href="/help/push">
   push
   </a>
   </td><td>
   push changes to the specified destination
   </td></tr>
   <tr><td>
   <a href="/help/remove">
   remove
   </a>
   </td><td>
   remove the specified files on the next commit
   </td></tr>
   <tr><td>
   <a href="/help/serve">
   serve
   </a>
   </td><td>
   start stand-alone webserver
   </td></tr>
   <tr><td>
   <a href="/help/status">
   status
   </a>
   </td><td>
   show changed files in the working directory
   </td></tr>
   <tr><td>
   <a href="/help/summary">
   summary
   </a>
   </td><td>
   summarize working directory state
   </td></tr>
   <tr><td>
   <a href="/help/update">
   update
   </a>
   </td><td>
   update working directory (or switch revisions)
   </td></tr>
   
   
   
   <tr><td colspan="2"><h2><a name="other" href="#other">Other Commands</a></h2></td></tr>
   
   <tr><td>
   <a href="/help/addremove">
   addremove
   </a>
   </td><td>
   add all new files, delete all missing files
   </td></tr>
   <tr><td>
   <a href="/help/archive">
   archive
   </a>
   </td><td>
   create an unversioned archive of a repository revision
   </td></tr>
   <tr><td>
   <a href="/help/backout">
   backout
   </a>
   </td><td>
   reverse effect of earlier changeset
   </td></tr>
   <tr><td>
   <a href="/help/bisect">
   bisect
   </a>
   </td><td>
   subdivision search of changesets
   </td></tr>
   <tr><td>
   <a href="/help/bookmarks">
   bookmarks
   </a>
   </td><td>
   create a new bookmark or list existing bookmarks
   </td></tr>
   <tr><td>
   <a href="/help/branch">
   branch
   </a>
   </td><td>
   set or show the current branch name
   </td></tr>
   <tr><td>
   <a href="/help/branches">
   branches
   </a>
   </td><td>
   list repository named branches
   </td></tr>
   <tr><td>
   <a href="/help/bundle">
   bundle
   </a>
   </td><td>
   create a bundle file
   </td></tr>
   <tr><td>
   <a href="/help/cat">
   cat
   </a>
   </td><td>
   output the current or given revision of files
   </td></tr>
   <tr><td>
   <a href="/help/config">
   config
   </a>
   </td><td>
   show combined config settings from all hgrc files
   </td></tr>
   <tr><td>
   <a href="/help/copy">
   copy
   </a>
   </td><td>
   mark files as copied for the next commit
   </td></tr>
   <tr><td>
   <a href="/help/files">
   files
   </a>
   </td><td>
   list tracked files
   </td></tr>
   <tr><td>
   <a href="/help/graft">
   graft
   </a>
   </td><td>
   copy changes from other branches onto the current branch
   </td></tr>
   <tr><td>
   <a href="/help/grep">
   grep
   </a>
   </td><td>
   search for a pattern in specified files
   </td></tr>
   <tr><td>
   <a href="/help/hashelp">
   hashelp
   </a>
   </td><td>
   Extension command's help
   </td></tr>
   <tr><td>
   <a href="/help/heads">
   heads
   </a>
   </td><td>
   show branch heads
   </td></tr>
   <tr><td>
   <a href="/help/help">
   help
   </a>
   </td><td>
   show help for a given topic or a help overview
   </td></tr>
   <tr><td>
   <a href="/help/hgalias">
   hgalias
   </a>
   </td><td>
   My doc
   </td></tr>
   <tr><td>
   <a href="/help/hgaliasnodoc">
   hgaliasnodoc
   </a>
   </td><td>
   summarize working directory state
   </td></tr>
   <tr><td>
   <a href="/help/identify">
   identify
   </a>
   </td><td>
   identify the working directory or specified revision
   </td></tr>
   <tr><td>
   <a href="/help/import">
   import
   </a>
   </td><td>
   import an ordered set of patches
   </td></tr>
   <tr><td>
   <a href="/help/incoming">
   incoming
   </a>
   </td><td>
   show new changesets found in source
   </td></tr>
   <tr><td>
   <a href="/help/manifest">
   manifest
   </a>
   </td><td>
   output the current or given revision of the project manifest
   </td></tr>
   <tr><td>
   <a href="/help/nohelp">
   nohelp
   </a>
   </td><td>
   (no help text available)
   </td></tr>
   <tr><td>
   <a href="/help/outgoing">
   outgoing
   </a>
   </td><td>
   show changesets not found in the destination
   </td></tr>
   <tr><td>
   <a href="/help/paths">
   paths
   </a>
   </td><td>
   show aliases for remote repositories
   </td></tr>
   <tr><td>
   <a href="/help/phase">
   phase
   </a>
   </td><td>
   set or show the current phase name
   </td></tr>
   <tr><td>
   <a href="/help/recover">
   recover
   </a>
   </td><td>
   roll back an interrupted transaction
   </td></tr>
   <tr><td>
   <a href="/help/rename">
   rename
   </a>
   </td><td>
   rename files; equivalent of copy + remove
   </td></tr>
   <tr><td>
   <a href="/help/resolve">
   resolve
   </a>
   </td><td>
   redo merges or set/view the merge status of files
   </td></tr>
   <tr><td>
   <a href="/help/revert">
   revert
   </a>
   </td><td>
   restore files to their checkout state
   </td></tr>
   <tr><td>
   <a href="/help/root">
   root
   </a>
   </td><td>
   print the root (top) of the current working directory
   </td></tr>
   <tr><td>
   <a href="/help/shellalias">
   shellalias
   </a>
   </td><td>
   (no help text available)
   </td></tr>
   <tr><td>
   <a href="/help/shelve">
   shelve
   </a>
   </td><td>
   save and set aside changes from the working directory
   </td></tr>
   <tr><td>
   <a href="/help/tag">
   tag
   </a>
   </td><td>
   add one or more tags for the current or given revision
   </td></tr>
   <tr><td>
   <a href="/help/tags">
   tags
   </a>
   </td><td>
   list repository tags
   </td></tr>
   <tr><td>
   <a href="/help/unbundle">
   unbundle
   </a>
   </td><td>
   apply one or more bundle files
   </td></tr>
   <tr><td>
   <a href="/help/unshelve">
   unshelve
   </a>
   </td><td>
   restore a shelved change to the working directory
   </td></tr>
   <tr><td>
   <a href="/help/verify">
   verify
   </a>
   </td><td>
   verify the integrity of the repository
   </td></tr>
   <tr><td>
   <a href="/help/version">
   version
   </a>
   </td><td>
   output version and copyright information
   </td></tr>
   
   
   </table>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/add"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: add</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: add</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <p>
   hg add [OPTION]... [FILE]...
   </p>
   <p>
   add the specified files on the next commit
   </p>
   <p>
   Schedule files to be version controlled and added to the
   repository.
   </p>
   <p>
   The files will be added to the repository at the next commit. To
   undo an add before that, see 'hg forget'.
   </p>
   <p>
   If no names are given, add all files to the repository (except
   files matching &quot;.hgignore&quot;).
   </p>
   <p>
   Examples:
   </p>
   <ul>
    <li> New (unknown) files are added   automatically by 'hg add':
   <pre>
   \$ ls (re)
   foo.c
   \$ hg status (re)
   ? foo.c
   \$ hg add (re)
   adding foo.c
   \$ hg status (re)
   A foo.c
   </pre>
    <li> Specific files to be added can be specified:
   <pre>
   \$ ls (re)
   bar.c  foo.c
   \$ hg status (re)
   ? bar.c
   ? foo.c
   \$ hg add bar.c (re)
   \$ hg status (re)
   A bar.c
   ? foo.c
   </pre>
   </ul>
   <p>
   Returns 0 if all files are successfully added.
   </p>
   <p>
   options ([+] can be repeated):
   </p>
   <table>
   <tr><td>-I</td>
   <td>--include PATTERN [+]</td>
   <td>include names matching the given patterns</td></tr>
   <tr><td>-X</td>
   <td>--exclude PATTERN [+]</td>
   <td>exclude names matching the given patterns</td></tr>
   <tr><td>-S</td>
   <td>--subrepos</td>
   <td>recurse into subrepositories</td></tr>
   <tr><td>-n</td>
   <td>--dry-run</td>
   <td>do not perform actions, just print output</td></tr>
   </table>
   <p>
   global options ([+] can be repeated):
   </p>
   <table>
   <tr><td>-R</td>
   <td>--repository REPO</td>
   <td>repository root directory or name of overlay bundle file</td></tr>
   <tr><td></td>
   <td>--cwd DIR</td>
   <td>change working directory</td></tr>
   <tr><td>-y</td>
   <td>--noninteractive</td>
   <td>do not prompt, automatically pick the first choice for all prompts</td></tr>
   <tr><td>-q</td>
   <td>--quiet</td>
   <td>suppress output</td></tr>
   <tr><td>-v</td>
   <td>--verbose</td>
   <td>enable additional output</td></tr>
   <tr><td></td>
   <td>--color TYPE</td>
   <td>when to colorize (boolean, always, auto, never, or debug)</td></tr>
   <tr><td></td>
   <td>--config CONFIG [+]</td>
   <td>set/override config option (use 'section.name=value')</td></tr>
   <tr><td></td>
   <td>--debug</td>
   <td>enable debugging output</td></tr>
   <tr><td></td>
   <td>--debugger</td>
   <td>start debugger</td></tr>
   <tr><td></td>
   <td>--encoding ENCODE</td>
   <td>set the charset encoding (default: ascii)</td></tr>
   <tr><td></td>
   <td>--encodingmode MODE</td>
   <td>set the charset encoding mode (default: strict)</td></tr>
   <tr><td></td>
   <td>--traceback</td>
   <td>always print a traceback on exception</td></tr>
   <tr><td></td>
   <td>--time</td>
   <td>time how long the command takes</td></tr>
   <tr><td></td>
   <td>--profile</td>
   <td>print command execution profile</td></tr>
   <tr><td></td>
   <td>--version</td>
   <td>output version information and exit</td></tr>
   <tr><td>-h</td>
   <td>--help</td>
   <td>display help and exit</td></tr>
   <tr><td></td>
   <td>--hidden</td>
   <td>consider hidden changesets</td></tr>
   <tr><td></td>
   <td>--pager TYPE</td>
   <td>when to paginate (boolean, always, auto, or never) (default: auto)</td></tr>
   </table>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/remove"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: remove</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: remove</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <p>
   hg remove [OPTION]... FILE...
   </p>
   <p>
   aliases: rm
   </p>
   <p>
   remove the specified files on the next commit
   </p>
   <p>
   Schedule the indicated files for removal from the current branch.
   </p>
   <p>
   This command schedules the files to be removed at the next commit.
   To undo a remove before that, see 'hg revert'. To undo added
   files, see 'hg forget'.
   </p>
   <p>
   -A/--after can be used to remove only files that have already
   been deleted, -f/--force can be used to force deletion, and -Af
   can be used to remove files from the next revision without
   deleting them from the working directory.
   </p>
   <p>
   The following table details the behavior of remove for different
   file states (columns) and option combinations (rows). The file
   states are Added [A], Clean [C], Modified [M] and Missing [!]
   (as reported by 'hg status'). The actions are Warn, Remove
   (from branch) and Delete (from disk):
   </p>
   <table>
   <tr><td>opt/state</td>
   <td>A</td>
   <td>C</td>
   <td>M</td>
   <td>!</td></tr>
   <tr><td>none</td>
   <td>W</td>
   <td>RD</td>
   <td>W</td>
   <td>R</td></tr>
   <tr><td>-f</td>
   <td>R</td>
   <td>RD</td>
   <td>RD</td>
   <td>R</td></tr>
   <tr><td>-A</td>
   <td>W</td>
   <td>W</td>
   <td>W</td>
   <td>R</td></tr>
   <tr><td>-Af</td>
   <td>R</td>
   <td>R</td>
   <td>R</td>
   <td>R</td></tr>
   </table>
   <p>
   <b>Note:</b> 
   </p>
   <p>
   'hg remove' never deletes files in Added [A] state from the
   working directory, not even if &quot;--force&quot; is specified.
   </p>
   <p>
   Returns 0 on success, 1 if any warnings encountered.
   </p>
   <p>
   options ([+] can be repeated):
   </p>
   <table>
   <tr><td>-A</td>
   <td>--after</td>
   <td>record delete for missing files</td></tr>
   <tr><td>-f</td>
   <td>--force</td>
   <td>forget added files, delete modified files</td></tr>
   <tr><td>-S</td>
   <td>--subrepos</td>
   <td>recurse into subrepositories</td></tr>
   <tr><td>-I</td>
   <td>--include PATTERN [+]</td>
   <td>include names matching the given patterns</td></tr>
   <tr><td>-X</td>
   <td>--exclude PATTERN [+]</td>
   <td>exclude names matching the given patterns</td></tr>
   <tr><td>-n</td>
   <td>--dry-run</td>
   <td>do not perform actions, just print output</td></tr>
   </table>
   <p>
   global options ([+] can be repeated):
   </p>
   <table>
   <tr><td>-R</td>
   <td>--repository REPO</td>
   <td>repository root directory or name of overlay bundle file</td></tr>
   <tr><td></td>
   <td>--cwd DIR</td>
   <td>change working directory</td></tr>
   <tr><td>-y</td>
   <td>--noninteractive</td>
   <td>do not prompt, automatically pick the first choice for all prompts</td></tr>
   <tr><td>-q</td>
   <td>--quiet</td>
   <td>suppress output</td></tr>
   <tr><td>-v</td>
   <td>--verbose</td>
   <td>enable additional output</td></tr>
   <tr><td></td>
   <td>--color TYPE</td>
   <td>when to colorize (boolean, always, auto, never, or debug)</td></tr>
   <tr><td></td>
   <td>--config CONFIG [+]</td>
   <td>set/override config option (use 'section.name=value')</td></tr>
   <tr><td></td>
   <td>--debug</td>
   <td>enable debugging output</td></tr>
   <tr><td></td>
   <td>--debugger</td>
   <td>start debugger</td></tr>
   <tr><td></td>
   <td>--encoding ENCODE</td>
   <td>set the charset encoding (default: ascii)</td></tr>
   <tr><td></td>
   <td>--encodingmode MODE</td>
   <td>set the charset encoding mode (default: strict)</td></tr>
   <tr><td></td>
   <td>--traceback</td>
   <td>always print a traceback on exception</td></tr>
   <tr><td></td>
   <td>--time</td>
   <td>time how long the command takes</td></tr>
   <tr><td></td>
   <td>--profile</td>
   <td>print command execution profile</td></tr>
   <tr><td></td>
   <td>--version</td>
   <td>output version information and exit</td></tr>
   <tr><td>-h</td>
   <td>--help</td>
   <td>display help and exit</td></tr>
   <tr><td></td>
   <td>--hidden</td>
   <td>consider hidden changesets</td></tr>
   <tr><td></td>
   <td>--pager TYPE</td>
   <td>when to paginate (boolean, always, auto, or never) (default: auto)</td></tr>
   </table>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/dates"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: dates</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: dates</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <h1>Date Formats</h1>
   <p>
   Some commands allow the user to specify a date, e.g.:
   </p>
   <ul>
    <li> backout, commit, import, tag: Specify the commit date.
    <li> log, revert, update: Select revision(s) by date.
   </ul>
   <p>
   Many date formats are valid. Here are some examples:
   </p>
   <ul>
    <li> &quot;Wed Dec 6 13:18:29 2006&quot; (local timezone assumed)
    <li> &quot;Dec 6 13:18 -0600&quot; (year assumed, time offset provided)
    <li> &quot;Dec 6 13:18 UTC&quot; (UTC and GMT are aliases for +0000)
    <li> &quot;Dec 6&quot; (midnight)
    <li> &quot;13:18&quot; (today assumed)
    <li> &quot;3:39&quot; (3:39AM assumed)
    <li> &quot;3:39pm&quot; (15:39)
    <li> &quot;2006-12-06 13:18:29&quot; (ISO 8601 format)
    <li> &quot;2006-12-6 13:18&quot;
    <li> &quot;2006-12-6&quot;
    <li> &quot;12-6&quot;
    <li> &quot;12/6&quot;
    <li> &quot;12/6/6&quot; (Dec 6 2006)
    <li> &quot;today&quot; (midnight)
    <li> &quot;yesterday&quot; (midnight)
    <li> &quot;now&quot; - right now
   </ul>
   <p>
   Lastly, there is Mercurial's internal format:
   </p>
   <ul>
    <li> &quot;1165411109 0&quot; (Wed Dec 6 13:18:29 2006 UTC)
   </ul>
   <p>
   This is the internal representation format for dates. The first number
   is the number of seconds since the epoch (1970-01-01 00:00 UTC). The
   second is the offset of the local timezone, in seconds west of UTC
   (negative if the timezone is east of UTC).
   </p>
   <p>
   The log command also accepts date ranges:
   </p>
   <ul>
    <li> &quot;&lt;DATE&quot; - at or before a given date/time
    <li> &quot;&gt;DATE&quot; - on or after a given date/time
    <li> &quot;DATE to DATE&quot; - a date range, inclusive
    <li> &quot;-DAYS&quot; - within a given number of days of today
   </ul>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/pager"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: pager</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: pager</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <h1>Pager Support</h1>
   <p>
   Some Mercurial commands can produce a lot of output, and Mercurial will
   attempt to use a pager to make those commands more pleasant.
   </p>
   <p>
   To set the pager that should be used, set the application variable:
   </p>
   <pre>
   [pager]
   pager = less -FRX
   </pre>
   <p>
   If no pager is set in the user or repository configuration, Mercurial uses the
   environment variable $PAGER. If $PAGER is not set, pager.pager from the default
   or system configuration is used. If none of these are set, a default pager will
   be used, typically 'less' on Unix and 'more' on Windows.
   </p>
   <p>
   You can disable the pager for certain commands by adding them to the
   pager.ignore list:
   </p>
   <pre>
   [pager]
   ignore = version, help, update
   </pre>
   <p>
   To ignore global commands like 'hg version' or 'hg help', you have
   to specify them in your user configuration file.
   </p>
   <p>
   To control whether the pager is used at all for an individual command,
   you can use --pager=&lt;value&gt;:
   </p>
   <ul>
    <li> use as needed: 'auto'.
    <li> require the pager: 'yes' or 'on'.
    <li> suppress the pager: 'no' or 'off' (any unrecognized value   will also work).
   </ul>
   <p>
   To globally turn off all attempts to use a pager, set:
   </p>
   <pre>
   [ui]
   paginate = never
   </pre>
   <p>
   which will prevent the pager from running.
   </p>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
 Sub-topic indexes rendered properly
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/internals"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: internals</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
   <li><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <table class="bigtable">
   <tr><td colspan="2"><h2><a name="topics" href="#topics">Topics</a></h2></td></tr>
   
   <tr><td>
   <a href="/help/internals.bundle2">
   bundle2
   </a>
   </td><td>
   Bundle2
   </td></tr>
   <tr><td>
   <a href="/help/internals.bundles">
   bundles
   </a>
   </td><td>
   Bundles
   </td></tr>
   <tr><td>
   <a href="/help/internals.cbor">
   cbor
   </a>
   </td><td>
   CBOR
   </td></tr>
   <tr><td>
   <a href="/help/internals.censor">
   censor
   </a>
   </td><td>
   Censor
   </td></tr>
   <tr><td>
   <a href="/help/internals.changegroups">
   changegroups
   </a>
   </td><td>
   Changegroups
   </td></tr>
   <tr><td>
   <a href="/help/internals.config">
   config
   </a>
   </td><td>
   Config Registrar
   </td></tr>
   <tr><td>
   <a href="/help/internals.extensions">
   extensions
   </a>
   </td><td>
   Extension API
   </td></tr>
   <tr><td>
   <a href="/help/internals.mergestate">
   mergestate
   </a>
   </td><td>
   Mergestate
   </td></tr>
   <tr><td>
   <a href="/help/internals.requirements">
   requirements
   </a>
   </td><td>
   Repository Requirements
   </td></tr>
   <tr><td>
   <a href="/help/internals.revlogs">
   revlogs
   </a>
   </td><td>
   Revision Logs
   </td></tr>
   <tr><td>
   <a href="/help/internals.wireprotocol">
   wireprotocol
   </a>
   </td><td>
   Wire Protocol
   </td></tr>
   <tr><td>
   <a href="/help/internals.wireprotocolrpc">
   wireprotocolrpc
   </a>
   </td><td>
   Wire Protocol RPC
   </td></tr>
   <tr><td>
   <a href="/help/internals.wireprotocolv2">
   wireprotocolv2
   </a>
   </td><td>
   Wire Protocol Version 2
   </td></tr>
   
   
   
   
   
   </table>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
 Sub-topic topics rendered properly
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/internals.changegroups"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: internals.changegroups</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
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   <h3>Help: internals.changegroups</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <h1>Changegroups</h1>
   <p>
   Changegroups are representations of repository revlog data, specifically
   the changelog data, root/flat manifest data, treemanifest data, and
   filelogs.
   </p>
   <p>
   There are 3 versions of changegroups: &quot;1&quot;, &quot;2&quot;, and &quot;3&quot;. From a
   high-level, versions &quot;1&quot; and &quot;2&quot; are almost exactly the same, with the
   only difference being an additional item in the *delta header*. Version
   &quot;3&quot; adds support for storage flags in the *delta header* and optionally
   exchanging treemanifests (enabled by setting an option on the
   &quot;changegroup&quot; part in the bundle2).
   </p>
   <p>
   Changegroups when not exchanging treemanifests consist of 3 logical
   segments:
   </p>
   <pre>
   +---------------------------------+
   |           |          |          |
   | changeset | manifest | filelogs |
   |           |          |          |
   |           |          |          |
   +---------------------------------+
   </pre>
   <p>
   When exchanging treemanifests, there are 4 logical segments:
   </p>
   <pre>
   +-------------------------------------------------+
   |           |          |               |          |
   | changeset |   root   | treemanifests | filelogs |
   |           | manifest |               |          |
   |           |          |               |          |
   +-------------------------------------------------+
   </pre>
   <p>
   The principle building block of each segment is a *chunk*. A *chunk*
   is a framed piece of data:
   </p>
   <pre>
   +---------------------------------------+
   |           |                           |
   |  length   |           data            |
   | (4 bytes) |   (&lt;length - 4&gt; bytes)    |
   |           |                           |
   +---------------------------------------+
   </pre>
   <p>
   All integers are big-endian signed integers. Each chunk starts with a 32-bit
   integer indicating the length of the entire chunk (including the length field
   itself).
   </p>
   <p>
   There is a special case chunk that has a value of 0 for the length
   (&quot;0x00000000&quot;). We call this an *empty chunk*.
   </p>
   <h2>Delta Groups</h2>
   <p>
   A *delta group* expresses the content of a revlog as a series of deltas,
   or patches against previous revisions.
   </p>
   <p>
   Delta groups consist of 0 or more *chunks* followed by the *empty chunk*
   to signal the end of the delta group:
   </p>
   <pre>
   +------------------------------------------------------------------------+
   |                |             |               |             |           |
   | chunk0 length  | chunk0 data | chunk1 length | chunk1 data |    0x0    |
   |   (4 bytes)    |  (various)  |   (4 bytes)   |  (various)  | (4 bytes) |
   |                |             |               |             |           |
   +------------------------------------------------------------------------+
   </pre>
   <p>
   Each *chunk*'s data consists of the following:
   </p>
   <pre>
   +---------------------------------------+
   |                        |              |
   |     delta header       |  delta data  |
   |  (various by version)  |  (various)   |
   |                        |              |
   +---------------------------------------+
   </pre>
   <p>
   The *delta data* is a series of *delta*s that describe a diff from an existing
   entry (either that the recipient already has, or previously specified in the
   bundle/changegroup).
   </p>
   <p>
   The *delta header* is different between versions &quot;1&quot;, &quot;2&quot;, and
   &quot;3&quot; of the changegroup format.
   </p>
   <p>
   Version 1 (headerlen=80):
   </p>
   <pre>
   +------------------------------------------------------+
   |            |             |             |             |
   |    node    |   p1 node   |   p2 node   |  link node  |
   | (20 bytes) |  (20 bytes) |  (20 bytes) |  (20 bytes) |
   |            |             |             |             |
   +------------------------------------------------------+
   </pre>
   <p>
   Version 2 (headerlen=100):
   </p>
   <pre>
   +------------------------------------------------------------------+
   |            |             |             |            |            |
   |    node    |   p1 node   |   p2 node   | base node  | link node  |
   | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) |
   |            |             |             |            |            |
   +------------------------------------------------------------------+
   </pre>
   <p>
   Version 3 (headerlen=102):
   </p>
   <pre>
   +------------------------------------------------------------------------------+
   |            |             |             |            |            |           |
   |    node    |   p1 node   |   p2 node   | base node  | link node  |   flags   |
   | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) | (2 bytes) |
   |            |             |             |            |            |           |
   +------------------------------------------------------------------------------+
   </pre>
   <p>
   The *delta data* consists of &quot;chunklen - 4 - headerlen&quot; bytes, which contain a
   series of *delta*s, densely packed (no separators). These deltas describe a diff
   from an existing entry (either that the recipient already has, or previously
   specified in the bundle/changegroup). The format is described more fully in
   &quot;hg help internals.bdiff&quot;, but briefly:
   </p>
   <pre>
   +---------------------------------------------------------------+
   |              |            |            |                      |
   | start offset | end offset | new length |        content       |
   |  (4 bytes)   |  (4 bytes) |  (4 bytes) | (&lt;new length&gt; bytes) |
   |              |            |            |                      |
   +---------------------------------------------------------------+
   </pre>
   <p>
   Please note that the length field in the delta data does *not* include itself.
   </p>
   <p>
   In version 1, the delta is always applied against the previous node from
   the changegroup or the first parent if this is the first entry in the
   changegroup.
   </p>
   <p>
   In version 2 and up, the delta base node is encoded in the entry in the
   changegroup. This allows the delta to be expressed against any parent,
   which can result in smaller deltas and more efficient encoding of data.
   </p>
   <p>
   The *flags* field holds bitwise flags affecting the processing of revision
   data. The following flags are defined:
   </p>
   <dl>
    <dt>32768
    <dd>Censored revision. The revision's fulltext has been replaced by censor metadata. May only occur on file revisions.
    <dt>16384
    <dd>Ellipsis revision. Revision hash does not match data (likely due to rewritten parents).
    <dt>8192
    <dd>Externally stored. The revision fulltext contains &quot;key:value&quot; &quot;\n&quot; delimited metadata defining an object stored elsewhere. Used by the LFS extension.
   </dl>
   <p>
   For historical reasons, the integer values are identical to revlog version 1
   per-revision storage flags and correspond to bits being set in this 2-byte
   field. Bits were allocated starting from the most-significant bit, hence the
   reverse ordering and allocation of these flags.
   </p>
   <h2>Changeset Segment</h2>
   <p>
   The *changeset segment* consists of a single *delta group* holding
   changelog data. The *empty chunk* at the end of the *delta group* denotes
   the boundary to the *manifest segment*.
   </p>
   <h2>Manifest Segment</h2>
   <p>
   The *manifest segment* consists of a single *delta group* holding manifest
   data. If treemanifests are in use, it contains only the manifest for the
   root directory of the repository. Otherwise, it contains the entire
   manifest data. The *empty chunk* at the end of the *delta group* denotes
   the boundary to the next segment (either the *treemanifests segment* or the
   *filelogs segment*, depending on version and the request options).
   </p>
   <h3>Treemanifests Segment</h3>
   <p>
   The *treemanifests segment* only exists in changegroup version &quot;3&quot;, and
   only if the 'treemanifest' param is part of the bundle2 changegroup part
   (it is not possible to use changegroup version 3 outside of bundle2).
   Aside from the filenames in the *treemanifests segment* containing a
   trailing &quot;/&quot; character, it behaves identically to the *filelogs segment*
   (see below). The final sub-segment is followed by an *empty chunk* (logically,
   a sub-segment with filename size 0). This denotes the boundary to the
   *filelogs segment*.
   </p>
   <h2>Filelogs Segment</h2>
   <p>
   The *filelogs segment* consists of multiple sub-segments, each
   corresponding to an individual file whose data is being described:
   </p>
   <pre>
   +--------------------------------------------------+
   |          |          |          |     |           |
   | filelog0 | filelog1 | filelog2 | ... |    0x0    |
   |          |          |          |     | (4 bytes) |
   |          |          |          |     |           |
   +--------------------------------------------------+
   </pre>
   <p>
   The final filelog sub-segment is followed by an *empty chunk* (logically,
   a sub-segment with filename size 0). This denotes the end of the segment
   and of the overall changegroup.
   </p>
   <p>
   Each filelog sub-segment consists of the following:
   </p>
   <pre>
   +------------------------------------------------------+
   |                 |                      |             |
   | filename length |       filename       | delta group |
   |    (4 bytes)    | (&lt;length - 4&gt; bytes) |  (various)  |
   |                 |                      |             |
   +------------------------------------------------------+
   </pre>
   <p>
   That is, a *chunk* consisting of the filename (not terminated or padded)
   followed by N chunks constituting the *delta group* for this file. The
   *empty chunk* at the end of each *delta group* denotes the boundary to the
   next filelog sub-segment.
   </p>
   
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   <h3>error</h3>
   
   
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   [1]
 
   $ killdaemons.py
 
 #endif