mercurial/commands.py

# commands.py - command processing for 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, incorporated herein by reference.

from node import hex, nullid, nullrev, short
from lock import release
from i18n import _, gettext
import os, re, sys, difflib, time, tempfile
import hg, util, revlog, bundlerepo, extensions, copies, error
import patch, help, mdiff, url, encoding
import archival, changegroup, cmdutil, sshserver, hbisect
from hgweb import server
import merge as merge_
import minirst

# Commands start here, listed alphabetically

def add(ui, repo, *pats, **opts):
    """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.
    """

    bad = []
    names = []
    m = cmdutil.match(repo, pats, opts)
    oldbad = m.bad
    m.bad = lambda x,y: bad.append(x) or oldbad(x,y)

    for f in repo.walk(m):
        exact = m.exact(f)
        if exact or f not in repo.dirstate:
            names.append(f)
            if ui.verbose or not exact:
                ui.status(_('adding %s\n') % m.rel(f))
    if not opts.get('dry_run'):
        bad += [f for f in repo.add(names) if f in m.files()]
    return bad and 1 or 0

def addremove(ui, repo, *pats, **opts):
    """add all new files, delete all missing files

    Add all new files and remove all missing files from the
    repository.

    New files are ignored if they match any of the patterns in
    .hgignore. As with add, these changes take effect at the next
    commit.

    Use the -s/--similarity option to detect renamed files. With a
    parameter greater than 0, this compares every removed file with
    every added file and records those similar enough as renames. This
    option takes a percentage between 0 (disabled) and 100 (files must
    be identical) as its parameter. Detecting renamed files this way
    can be expensive.
    """
    try:
        sim = float(opts.get('similarity') or 0)
    except ValueError:
        raise util.Abort(_('similarity must be a number'))
    if sim < 0 or sim > 100:
        raise util.Abort(_('similarity must be between 0 and 100'))
    return cmdutil.addremove(repo, pats, opts, similarity=sim/100.)

def annotate(ui, repo, *pats, **opts):
    """show changeset information by line for each file

    List changes in files, showing the revision id responsible for
    each line

    This command is useful for discovering when a change was made and
    by whom.

    Without the -a/--text option, annotate will avoid processing files
    it detects as binary. With -a, annotate will annotate the file
    anyway, although the results will probably be neither useful
    nor desirable.
    """
    datefunc = ui.quiet and util.shortdate or util.datestr
    getdate = util.cachefunc(lambda x: datefunc(x[0].date()))

    if not pats:
        raise util.Abort(_('at least one filename or pattern is required'))

    opmap = [('user', lambda x: ui.shortuser(x[0].user())),
             ('number', lambda x: str(x[0].rev())),
             ('changeset', lambda x: short(x[0].node())),
             ('date', getdate),
             ('follow', lambda x: x[0].path()),
            ]

    if (not opts.get('user') and not opts.get('changeset') and not opts.get('date')
        and not opts.get('follow')):
        opts['number'] = 1

    linenumber = opts.get('line_number') is not None
    if (linenumber and (not opts.get('changeset')) and (not opts.get('number'))):
        raise util.Abort(_('at least one of -n/-c is required for -l'))

    funcmap = [func for op, func in opmap if opts.get(op)]
    if linenumber:
        lastfunc = funcmap[-1]
        funcmap[-1] = lambda x: "%s:%s" % (lastfunc(x), x[1])

    ctx = repo[opts.get('rev')]

    m = cmdutil.match(repo, pats, opts)
    for abs in ctx.walk(m):
        fctx = ctx[abs]
        if not opts.get('text') and util.binary(fctx.data()):
            ui.write(_("%s: binary file\n") % ((pats and m.rel(abs)) or abs))
            continue

        lines = fctx.annotate(follow=opts.get('follow'),
                              linenumber=linenumber)
        pieces = []

        for f in funcmap:
            l = [f(n) for n, dummy in lines]
            if l:
                ml = max(map(len, l))
                pieces.append(["%*s" % (ml, x) for x in l])

        if pieces:
            for p, l in zip(zip(*pieces), lines):
                ui.write("%s: %s" % (" ".join(p), l[1]))

def archive(ui, repo, dest, **opts):
    '''create an unversioned archive of a repository revision

    By default, the revision used is the parent of the working
    directory; use -r/--rev to specify a different revision.

    To specify the type of archive to create, use -t/--type. Valid
    types are:

    :``files``: a directory full of files (default)
    :``tar``:   tar archive, uncompressed
    :``tbz2``:  tar archive, compressed using bzip2
    :``tgz``:   tar archive, compressed using gzip
    :``uzip``:  zip archive, uncompressed
    :``zip``:   zip archive, compressed using deflate

    The exact name of the destination archive or directory is given
    using a format string; see 'hg help export' for details.

    Each member added to an archive file has a directory prefix
    prepended. Use -p/--prefix to specify a format string for the
    prefix. The default is the basename of the archive, with suffixes
    removed.
    '''

    ctx = repo[opts.get('rev')]
    if not ctx:
        raise util.Abort(_('no working directory: please specify a revision'))
    node = ctx.node()
    dest = cmdutil.make_filename(repo, dest, node)
    if os.path.realpath(dest) == repo.root:
        raise util.Abort(_('repository root cannot be destination'))
    matchfn = cmdutil.match(repo, [], opts)
    kind = opts.get('type') or 'files'
    prefix = opts.get('prefix')
    if dest == '-':
        if kind == 'files':
            raise util.Abort(_('cannot archive plain files to stdout'))
        dest = sys.stdout
        if not prefix: prefix = os.path.basename(repo.root) + '-%h'
    prefix = cmdutil.make_filename(repo, prefix, node)
    archival.archive(repo, dest, node, kind, not opts.get('no_decode'),
                     matchfn, prefix)

def backout(ui, repo, node=None, rev=None, **opts):
    '''reverse effect of earlier changeset

    Commit the backed out changes as a new changeset. The new
    changeset is a child of the backed out changeset.

    If you backout a changeset other than the tip, a new head is
    created. This head will be the new tip and you should merge this
    backout changeset with another head.

    The --merge option remembers the parent of the working directory
    before starting the backout, then merges the new head with that
    changeset afterwards. This saves you from doing the merge by hand.
    The result of this merge is not committed, as with a normal merge.

    See 'hg help dates' for a list of formats valid for -d/--date.
    '''
    if rev and node:
        raise util.Abort(_("please specify just one revision"))

    if not rev:
        rev = node

    if not rev:
        raise util.Abort(_("please specify a revision to backout"))

    date = opts.get('date')
    if date:
        opts['date'] = util.parsedate(date)

    cmdutil.bail_if_changed(repo)
    node = repo.lookup(rev)

    op1, op2 = repo.dirstate.parents()
    a = repo.changelog.ancestor(op1, node)
    if a != node:
        raise util.Abort(_('cannot backout change on a different branch'))

    p1, p2 = repo.changelog.parents(node)
    if p1 == nullid:
        raise util.Abort(_('cannot backout a change with no parents'))
    if p2 != nullid:
        if not opts.get('parent'):
            raise util.Abort(_('cannot backout a merge changeset without '
                               '--parent'))
        p = repo.lookup(opts['parent'])
        if p not in (p1, p2):
            raise util.Abort(_('%s is not a parent of %s') %
                             (short(p), short(node)))
        parent = p
    else:
        if opts.get('parent'):
            raise util.Abort(_('cannot use --parent on non-merge changeset'))
        parent = p1

    # the backout should appear on the same branch
    branch = repo.dirstate.branch()
    hg.clean(repo, node, show_stats=False)
    repo.dirstate.setbranch(branch)
    revert_opts = opts.copy()
    revert_opts['date'] = None
    revert_opts['all'] = True
    revert_opts['rev'] = hex(parent)
    revert_opts['no_backup'] = None
    revert(ui, repo, **revert_opts)
    commit_opts = opts.copy()
    commit_opts['addremove'] = False
    if not commit_opts['message'] and not commit_opts['logfile']:
        # we don't translate commit messages
        commit_opts['message'] = "Backed out changeset %s" % short(node)
        commit_opts['force_editor'] = True
    commit(ui, repo, **commit_opts)
    def nice(node):
        return '%d:%s' % (repo.changelog.rev(node), short(node))
    ui.status(_('changeset %s backs out changeset %s\n') %
              (nice(repo.changelog.tip()), nice(node)))
    if op1 != node:
        hg.clean(repo, op1, show_stats=False)
        if opts.get('merge'):
            ui.status(_('merging with changeset %s\n') % nice(repo.changelog.tip()))
            hg.merge(repo, hex(repo.changelog.tip()))
        else:
            ui.status(_('the backout changeset is a new head - '
                        'do not forget to merge\n'))
            ui.status(_('(use "backout --merge" '
                        'if you want to auto-merge)\n'))

def bisect(ui, repo, rev=None, extra=None, command=None,
               reset=None, good=None, bad=None, skip=None, noupdate=None):
    """subdivision search of changesets

    This command helps to find changesets which introduce problems. To
    use, mark the earliest changeset you know exhibits the problem as
    bad, then mark the latest changeset which is free from the problem
    as good. Bisect will update your working directory to a revision
    for testing (unless the -U/--noupdate option is specified). Once
    you have performed tests, mark the working directory as good or
    bad, and bisect will either update to another candidate changeset
    or announce that it has found the bad revision.

    As a shortcut, you can also use the revision argument to mark a
    revision as good or bad without checking it out first.

    If you supply a command, it will be used for automatic bisection.
    Its exit status will be used to mark revisions as good or bad:
    status 0 means good, 125 means to skip the revision, 127
    (command not found) will abort the bisection, and any other
    non-zero exit status means the revision is bad.
    """
    def print_result(nodes, good):
        displayer = cmdutil.show_changeset(ui, repo, {})
        if len(nodes) == 1:
            # narrowed it down to a single revision
            if good:
                ui.write(_("The first good revision is:\n"))
            else:
                ui.write(_("The first bad revision is:\n"))
            displayer.show(repo[nodes[0]])
        else:
            # multiple possible revisions
            if good:
                ui.write(_("Due to skipped revisions, the first "
                        "good revision could be any of:\n"))
            else:
                ui.write(_("Due to skipped revisions, the first "
                        "bad revision could be any of:\n"))
            for n in nodes:
                displayer.show(repo[n])

    def check_state(state, interactive=True):
        if not state['good'] or not state['bad']:
            if (good or bad or skip or reset) and interactive:
                return
            if not state['good']:
                raise util.Abort(_('cannot bisect (no known good revisions)'))
            else:
                raise util.Abort(_('cannot bisect (no known bad revisions)'))
        return True

    # backward compatibility
    if rev in "good bad reset init".split():
        ui.warn(_("(use of 'hg bisect <cmd>' is deprecated)\n"))
        cmd, rev, extra = rev, extra, None
        if cmd == "good":
            good = True
        elif cmd == "bad":
            bad = True
        else:
            reset = True
    elif extra or good + bad + skip + reset + bool(command) > 1:
        raise util.Abort(_('incompatible arguments'))

    if reset:
        p = repo.join("bisect.state")
        if os.path.exists(p):
            os.unlink(p)
        return

    state = hbisect.load_state(repo)

    if command:
        changesets = 1
        try:
            while changesets:
                # update state
                status = util.system(command)
                if status == 125:
                    transition = "skip"
                elif status == 0:
                    transition = "good"
                # status < 0 means process was killed
                elif status == 127:
                    raise util.Abort(_("failed to execute %s") % command)
                elif status < 0:
                    raise util.Abort(_("%s killed") % command)
                else:
                    transition = "bad"
                ctx = repo[rev or '.']
                state[transition].append(ctx.node())
                ui.status(_('Changeset %d:%s: %s\n') % (ctx, ctx, transition))
                check_state(state, interactive=False)
                # bisect
                nodes, changesets, good = hbisect.bisect(repo.changelog, state)
                # update to next check
                cmdutil.bail_if_changed(repo)
                hg.clean(repo, nodes[0], show_stats=False)
        finally:
            hbisect.save_state(repo, state)
        return print_result(nodes, good)

    # update state
    node = repo.lookup(rev or '.')
    if good or bad or skip:
        if good:
            state['good'].append(node)
        elif bad:
            state['bad'].append(node)
        elif skip:
            state['skip'].append(node)
        hbisect.save_state(repo, state)

    if not check_state(state):
        return

    # actually bisect
    nodes, changesets, good = hbisect.bisect(repo.changelog, state)
    if changesets == 0:
        print_result(nodes, good)
    else:
        assert len(nodes) == 1 # only a single node can be tested next
        node = nodes[0]
        # compute the approximate number of remaining tests
        tests, size = 0, 2
        while size <= changesets:
            tests, size = tests + 1, size * 2
        rev = repo.changelog.rev(node)
        ui.write(_("Testing changeset %d:%s "
                   "(%d changesets remaining, ~%d tests)\n")
                 % (rev, short(node), changesets, tests))
        if not noupdate:
            cmdutil.bail_if_changed(repo)
            return hg.clean(repo, node)

def branch(ui, repo, label=None, **opts):
    """set or show the current branch name

    With no argument, show the current branch name. With one argument,
    set the working directory branch name (the branch will not exist
    in the repository until the next commit). Standard practice
    recommends that primary development take place on the 'default'
    branch.

    Unless -f/--force is specified, branch will not let you set a
    branch name that already exists, even if it's inactive.

    Use -C/--clean to reset the working directory branch to that of
    the parent of the working directory, negating a previous branch
    change.

    Use the command 'hg update' to switch to an existing branch. Use
    'hg commit --close-branch' to mark this branch as closed.
    """

    if opts.get('clean'):
        label = repo[None].parents()[0].branch()
        repo.dirstate.setbranch(label)
        ui.status(_('reset working directory to branch %s\n') % label)
    elif label:
        if not opts.get('force') and label in repo.branchtags():
            if label not in [p.branch() for p in repo.parents()]:
                raise util.Abort(_('a branch of the same name already exists'
                                   ' (use --force to override)'))
        repo.dirstate.setbranch(encoding.fromlocal(label))
        ui.status(_('marked working directory as branch %s\n') % label)
    else:
        ui.write("%s\n" % encoding.tolocal(repo.dirstate.branch()))

def branches(ui, repo, active=False, closed=False):
    """list repository named branches

    List the repository's named branches, indicating which ones are
    inactive. If -c/--closed is specified, also list branches which have
    been marked closed (see hg commit --close-branch).

    If -a/--active is specified, only show active branches. A branch
    is considered active if it contains repository heads.

    Use the command 'hg update' to switch to an existing branch.
    """

    hexfunc = ui.debugflag and hex or short
    activebranches = [repo[n].branch() for n in repo.heads()]
    def testactive(tag, node):
        realhead = tag in activebranches
        open = node in repo.branchheads(tag, closed=False)
        return realhead and open
    branches = sorted([(testactive(tag, node), repo.changelog.rev(node), tag)
                          for tag, node in repo.branchtags().items()],
                      reverse=True)

    for isactive, node, tag in branches:
        if (not active) or isactive:
            encodedtag = encoding.tolocal(tag)
            if ui.quiet:
                ui.write("%s\n" % encodedtag)
            else:
                hn = repo.lookup(node)
                if isactive:
                    notice = ''
                elif hn not in repo.branchheads(tag, closed=False):
                    if not closed:
                        continue
                    notice = _(' (closed)')
                else:
                    notice = _(' (inactive)')
                rev = str(node).rjust(31 - encoding.colwidth(encodedtag))
                data = encodedtag, rev, hexfunc(hn), notice
                ui.write("%s %s:%s%s\n" % data)

def bundle(ui, repo, fname, dest=None, **opts):
    """create a changegroup file

    Generate a compressed changegroup file collecting changesets not
    known to be in another repository.

    If no destination repository is specified the destination is
    assumed to have all the nodes specified by one or more --base
    parameters. To create a bundle containing all changesets, use
    -a/--all (or --base null).

    You can change compression method with the -t/--type option.
    The available compression methods are: none, bzip2, and
    gzip (by default, bundles are compressed using bzip2).

    The bundle file can then be transferred using conventional means
    and applied to another repository with the unbundle or pull
    command. This is useful when direct push and pull are not
    available or when exporting an entire repository is undesirable.

    Applying bundles preserves all changeset contents including
    permissions, copy/rename information, and revision history.
    """
    revs = opts.get('rev') or None
    if revs:
        revs = [repo.lookup(rev) for rev in revs]
    if opts.get('all'):
        base = ['null']
    else:
        base = opts.get('base')
    if base:
        if dest:
            raise util.Abort(_("--base is incompatible with specifying "
                               "a destination"))
        base = [repo.lookup(rev) for rev in base]
        # create the right base
        # XXX: nodesbetween / changegroup* should be "fixed" instead
        o = []
        has = set((nullid,))
        for n in base:
            has.update(repo.changelog.reachable(n))
        if revs:
            visit = list(revs)
        else:
            visit = repo.changelog.heads()
        seen = {}
        while visit:
            n = visit.pop(0)
            parents = [p for p in repo.changelog.parents(n) if p not in has]
            if len(parents) == 0:
                o.insert(0, n)
            else:
                for p in parents:
                    if p not in seen:
                        seen[p] = 1
                        visit.append(p)
    else:
        dest, revs, checkout = hg.parseurl(
            ui.expandpath(dest or 'default-push', dest or 'default'), revs)
        other = hg.repository(cmdutil.remoteui(repo, opts), dest)
        o = repo.findoutgoing(other, force=opts.get('force'))

    if revs:
        cg = repo.changegroupsubset(o, revs, 'bundle')
    else:
        cg = repo.changegroup(o, 'bundle')

    bundletype = opts.get('type', 'bzip2').lower()
    btypes = {'none': 'HG10UN', 'bzip2': 'HG10BZ', 'gzip': 'HG10GZ'}
    bundletype = btypes.get(bundletype)
    if bundletype not in changegroup.bundletypes:
        raise util.Abort(_('unknown bundle type specified with --type'))

    changegroup.writebundle(cg, fname, bundletype)

def cat(ui, repo, file1, *pats, **opts):
    """output the current or given revision of files

    Print the specified files as they were at the given revision. If
    no revision is given, the parent of the working directory is used,
    or tip if no revision is checked out.

    Output may be to a file, in which case the name of the file is
    given using a format string. The formatting rules are the same as
    for the export command, with the following additions:

    :``%s``: basename of file being printed
    :``%d``: dirname of file being printed, or '.' if in repository root
    :``%p``: root-relative path name of file being printed
    """
    ctx = repo[opts.get('rev')]
    err = 1
    m = cmdutil.match(repo, (file1,) + pats, opts)
    for abs in ctx.walk(m):
        fp = cmdutil.make_file(repo, opts.get('output'), ctx.node(), pathname=abs)
        data = ctx[abs].data()
        if opts.get('decode'):
            data = repo.wwritedata(abs, data)
        fp.write(data)
        err = 0
    return err

def clone(ui, source, dest=None, **opts):
    """make a copy of an existing repository

    Create a copy of an existing repository in a new directory.

    If no destination directory name is specified, it defaults to the
    basename of the source.

    The location of the source is added to the new repository's
    .hg/hgrc file, as the default to be used for future pulls.

    See 'hg help urls' for valid source format details.

    It is possible to specify an ``ssh://`` URL as the destination, but no
    .hg/hgrc and working directory will be created on the remote side.
    Please see 'hg help urls' for important details about ``ssh://`` URLs.

    If the -U/--noupdate option is specified, the new clone will contain
    only a repository (.hg) and no working copy (the working copy parent
    will be the null changeset). Otherwise, clone will initially check
    out (in order of precedence):

    a) the changeset, tag or branch specified with -u/--updaterev
    b) the changeset, tag or branch given with the first -r/--rev
    c) the head of the default branch

    Use 'hg clone -u . src dst' to checkout the source repository's
    parent changeset (applicable for local source repositories only).

    A set of changesets (tags, or branch names) to pull may be specified
    by listing each changeset (tag, or branch name) with -r/--rev.
    If -r/--rev is used, the cloned repository will contain only a subset
    of the changesets of the source repository. Only the set of changesets
    defined by all -r/--rev options (including all their ancestors)
    will be pulled into the destination repository.
    No subsequent changesets (including subsequent tags) will be present
    in the destination.

    Using -r/--rev (or 'clone src#rev dest') implies --pull, even for
    local source repositories.

    For efficiency, hardlinks are used for cloning whenever the source
    and destination are on the same filesystem (note this applies only
    to the repository data, not to the checked out files). Some
    filesystems, such as AFS, implement hardlinking incorrectly, but
    do not report errors. In these cases, use the --pull option to
    avoid hardlinking.

    In some cases, you can clone repositories and checked out files
    using full hardlinks with ::

      $ cp -al REPO REPOCLONE

    This is the fastest way to clone, but it is not always safe. The
    operation is not atomic (making sure REPO is not modified during
    the operation is up to you) and you have to make sure your editor
    breaks hardlinks (Emacs and most Linux Kernel tools do so). Also,
    this is not compatible with certain extensions that place their
    metadata under the .hg directory, such as mq.
    """
    if opts.get('noupdate') and opts.get('updaterev'):
        raise util.Abort(_("cannot specify both --noupdate and --updaterev"))

    hg.clone(cmdutil.remoteui(ui, opts), source, dest,
             pull=opts.get('pull'),
             stream=opts.get('uncompressed'),
             rev=opts.get('rev'),
             update=opts.get('updaterev') or not opts.get('noupdate'))

def commit(ui, repo, *pats, **opts):
    """commit the specified files or all outstanding changes

    Commit changes to the given files into the repository. Unlike a
    centralized RCS, this operation is a local operation. See hg push
    for a way to actively distribute your changes.

    If a list of files is omitted, all changes reported by "hg status"
    will be committed.

    If you are committing the result of a merge, do not provide any
    filenames or -I/-X filters.

    If no commit message is specified, the configured editor is
    started to prompt you for a message.

    See 'hg help dates' for a list of formats valid for -d/--date.
    """
    extra = {}
    if opts.get('close_branch'):
        extra['close'] = 1
    e = cmdutil.commiteditor
    if opts.get('force_editor'):
        e = cmdutil.commitforceeditor

    def commitfunc(ui, repo, message, match, opts):
        return repo.commit(message, opts.get('user'), opts.get('date'), match,
                           editor=e, extra=extra)

    node = cmdutil.commit(ui, repo, commitfunc, pats, opts)
    if not node:
        ui.status(_("nothing changed\n"))
        return
    cl = repo.changelog
    rev = cl.rev(node)
    parents = cl.parentrevs(rev)
    if rev - 1 in parents:
        # one of the parents was the old tip
        pass
    elif (parents == (nullrev, nullrev) or
          len(cl.heads(cl.node(parents[0]))) > 1 and
          (parents[1] == nullrev or len(cl.heads(cl.node(parents[1]))) > 1)):
        ui.status(_('created new head\n'))

    if ui.debugflag:
        ui.write(_('committed changeset %d:%s\n') % (rev, hex(node)))
    elif ui.verbose:
        ui.write(_('committed changeset %d:%s\n') % (rev, short(node)))

def copy(ui, repo, *pats, **opts):
    """mark files as copied for the next commit

    Mark dest as having copies of source files. If dest is a
    directory, copies are put in that directory. If dest is a file,
    the source must be a single file.

    By default, this command copies the contents of files as they
    exist in the working directory. If invoked with -A/--after, the
    operation is recorded, but no copying is performed.

    This command takes effect with the next commit. To undo a copy
    before that, see hg revert.
    """
    wlock = repo.wlock(False)
    try:
        return cmdutil.copy(ui, repo, pats, opts)
    finally:
        wlock.release()

def debugancestor(ui, repo, *args):
    """find the ancestor revision of two revisions in a given index"""
    if len(args) == 3:
        index, rev1, rev2 = args
        r = revlog.revlog(util.opener(os.getcwd(), audit=False), index)
        lookup = r.lookup
    elif len(args) == 2:
        if not repo:
            raise util.Abort(_("There is no Mercurial repository here "
                               "(.hg not found)"))
        rev1, rev2 = args
        r = repo.changelog
        lookup = repo.lookup
    else:
        raise util.Abort(_('either two or three arguments required'))
    a = r.ancestor(lookup(rev1), lookup(rev2))
    ui.write("%d:%s\n" % (r.rev(a), hex(a)))

def debugcommands(ui, cmd='', *args):
    for cmd, vals in sorted(table.iteritems()):
        cmd = cmd.split('|')[0].strip('^')
        opts = ', '.join([i[1] for i in vals[1]])
        ui.write('%s: %s\n' % (cmd, opts))

def debugcomplete(ui, cmd='', **opts):
    """returns the completion list associated with the given command"""

    if opts.get('options'):
        options = []
        otables = [globalopts]
        if cmd:
            aliases, entry = cmdutil.findcmd(cmd, table, False)
            otables.append(entry[1])
        for t in otables:
            for o in t:
                if o[0]:
                    options.append('-%s' % o[0])
                options.append('--%s' % o[1])
        ui.write("%s\n" % "\n".join(options))
        return

    cmdlist = cmdutil.findpossible(cmd, table)
    if ui.verbose:
        cmdlist = [' '.join(c[0]) for c in cmdlist.values()]
    ui.write("%s\n" % "\n".join(sorted(cmdlist)))

def debugfsinfo(ui, path = "."):
    open('.debugfsinfo', 'w').write('')
    ui.write('exec: %s\n' % (util.checkexec(path) and 'yes' or 'no'))
    ui.write('symlink: %s\n' % (util.checklink(path) and 'yes' or 'no'))
    ui.write('case-sensitive: %s\n' % (util.checkcase('.debugfsinfo')
                                and 'yes' or 'no'))
    os.unlink('.debugfsinfo')

def debugrebuildstate(ui, repo, rev="tip"):
    """rebuild the dirstate as it would look like for the given revision"""
    ctx = repo[rev]
    wlock = repo.wlock()
    try:
        repo.dirstate.rebuild(ctx.node(), ctx.manifest())
    finally:
        wlock.release()

def debugcheckstate(ui, repo):
    """validate the correctness of the current dirstate"""
    parent1, parent2 = repo.dirstate.parents()
    m1 = repo[parent1].manifest()
    m2 = repo[parent2].manifest()
    errors = 0
    for f in repo.dirstate:
        state = repo.dirstate[f]
        if state in "nr" and f not in m1:
            ui.warn(_("%s in state %s, but not in manifest1\n") % (f, state))
            errors += 1
        if state in "a" and f in m1:
            ui.warn(_("%s in state %s, but also in manifest1\n") % (f, state))
            errors += 1
        if state in "m" and f not in m1 and f not in m2:
            ui.warn(_("%s in state %s, but not in either manifest\n") %
                    (f, state))
            errors += 1
    for f in m1:
        state = repo.dirstate[f]
        if state not in "nrm":
            ui.warn(_("%s in manifest1, but listed as state %s") % (f, state))
            errors += 1
    if errors:
        error = _(".hg/dirstate inconsistent with current parent's manifest")
        raise util.Abort(error)

def showconfig(ui, repo, *values, **opts):
    """show combined config settings from all hgrc files

    With no arguments, print names and values of all config items.

    With one argument of the form section.name, print just the value
    of that config item.

    With multiple arguments, print names and values of all config
    items with matching section names.

    With --debug, the source (filename and line number) is printed
    for each config item.
    """

    untrusted = bool(opts.get('untrusted'))
    if values:
        if len([v for v in values if '.' in v]) > 1:
            raise util.Abort(_('only one config item permitted'))
    for section, name, value in ui.walkconfig(untrusted=untrusted):
        sectname = section + '.' + name
        if values:
            for v in values:
                if v == section:
                    ui.debug('%s: ' %
                             ui.configsource(section, name, untrusted))
                    ui.write('%s=%s\n' % (sectname, value))
                elif v == sectname:
                    ui.debug('%s: ' %
                             ui.configsource(section, name, untrusted))
                    ui.write(value, '\n')
        else:
            ui.debug('%s: ' %
                     ui.configsource(section, name, untrusted))
            ui.write('%s=%s\n' % (sectname, value))

def debugsetparents(ui, repo, rev1, rev2=None):
    """manually set the parents of the current working directory

    This is useful for writing repository conversion tools, but should
    be used with care.
    """

    if not rev2:
        rev2 = hex(nullid)

    wlock = repo.wlock()
    try:
        repo.dirstate.setparents(repo.lookup(rev1), repo.lookup(rev2))
    finally:
        wlock.release()

def debugstate(ui, repo, nodates=None):
    """show the contents of the current dirstate"""
    timestr = ""
    showdate = not nodates
    for file_, ent in sorted(repo.dirstate._map.iteritems()):
        if showdate:
            if ent[3] == -1:
                # Pad or slice to locale representation
                locale_len = len(time.strftime("%Y-%m-%d %H:%M:%S ", time.localtime(0)))
                timestr = 'unset'
                timestr = timestr[:locale_len] + ' '*(locale_len - len(timestr))
            else:
                timestr = time.strftime("%Y-%m-%d %H:%M:%S ", time.localtime(ent[3]))
        if ent[1] & 020000:
            mode = 'lnk'
        else:
            mode = '%3o' % (ent[1] & 0777)
        ui.write("%c %s %10d %s%s\n" % (ent[0], mode, ent[2], timestr, file_))
    for f in repo.dirstate.copies():
        ui.write(_("copy: %s -> %s\n") % (repo.dirstate.copied(f), f))

def debugsub(ui, repo, rev=None):
    if rev == '':
        rev = None
    for k,v in sorted(repo[rev].substate.items()):
        ui.write('path %s\n' % k)
        ui.write(' source   %s\n' % v[0])
        ui.write(' revision %s\n' % v[1])

def debugdata(ui, file_, rev):
    """dump the contents of a data file revision"""
    r = revlog.revlog(util.opener(os.getcwd(), audit=False), file_[:-2] + ".i")
    try:
        ui.write(r.revision(r.lookup(rev)))
    except KeyError:
        raise util.Abort(_('invalid revision identifier %s') % rev)

def debugdate(ui, date, range=None, **opts):
    """parse and display a date"""
    if opts["extended"]:
        d = util.parsedate(date, util.extendeddateformats)
    else:
        d = util.parsedate(date)
    ui.write("internal: %s %s\n" % d)
    ui.write("standard: %s\n" % util.datestr(d))
    if range:
        m = util.matchdate(range)
        ui.write("match: %s\n" % m(d[0]))

def debugindex(ui, file_):
    """dump the contents of an index file"""
    r = revlog.revlog(util.opener(os.getcwd(), audit=False), file_)
    ui.write("   rev    offset  length   base linkrev"
             " nodeid       p1           p2\n")
    for i in r:
        node = r.node(i)
        try:
            pp = r.parents(node)
        except:
            pp = [nullid, nullid]
        ui.write("% 6d % 9d % 7d % 6d % 7d %s %s %s\n" % (
                i, r.start(i), r.length(i), r.base(i), r.linkrev(i),
            short(node), short(pp[0]), short(pp[1])))

def debugindexdot(ui, file_):
    """dump an index DAG as a graphviz dot file"""
    r = revlog.revlog(util.opener(os.getcwd(), audit=False), file_)
    ui.write("digraph G {\n")
    for i in r:
        node = r.node(i)
        pp = r.parents(node)
        ui.write("\t%d -> %d\n" % (r.rev(pp[0]), i))
        if pp[1] != nullid:
            ui.write("\t%d -> %d\n" % (r.rev(pp[1]), i))
    ui.write("}\n")

def debuginstall(ui):
    '''test Mercurial installation'''

    def writetemp(contents):
        (fd, name) = tempfile.mkstemp(prefix="hg-debuginstall-")
        f = os.fdopen(fd, "wb")
        f.write(contents)
        f.close()
        return name

    problems = 0

    # encoding
    ui.status(_("Checking encoding (%s)...\n") % encoding.encoding)
    try:
        encoding.fromlocal("test")
    except util.Abort, inst:
        ui.write(" %s\n" % inst)
        ui.write(_(" (check that your locale is properly set)\n"))
        problems += 1

    # compiled modules
    ui.status(_("Checking extensions...\n"))
    try:
        import bdiff, mpatch, base85
    except Exception, inst:
        ui.write(" %s\n" % inst)
        ui.write(_(" One or more extensions could not be found"))
        ui.write(_(" (check that you compiled the extensions)\n"))
        problems += 1

    # templates
    ui.status(_("Checking templates...\n"))
    try:
        import templater
        templater.templater(templater.templatepath("map-cmdline.default"))
    except Exception, inst:
        ui.write(" %s\n" % inst)
        ui.write(_(" (templates seem to have been installed incorrectly)\n"))
        problems += 1

    # patch
    ui.status(_("Checking patch...\n"))
    patchproblems = 0
    a = "1\n2\n3\n4\n"
    b = "1\n2\n3\ninsert\n4\n"
    fa = writetemp(a)
    d = mdiff.unidiff(a, None, b, None, os.path.basename(fa),
        os.path.basename(fa))
    fd = writetemp(d)

    files = {}
    try:
        patch.patch(fd, ui, cwd=os.path.dirname(fa), files=files)
    except util.Abort, e:
        ui.write(_(" patch call failed:\n"))
        ui.write(" " + str(e) + "\n")
        patchproblems += 1
    else:
        if list(files) != [os.path.basename(fa)]:
            ui.write(_(" unexpected patch output!\n"))
            patchproblems += 1
        a = open(fa).read()
        if a != b:
            ui.write(_(" patch test failed!\n"))
            patchproblems += 1

    if patchproblems:
        if ui.config('ui', 'patch'):
            ui.write(_(" (Current patch tool may be incompatible with patch,"
                       " or misconfigured. Please check your .hgrc file)\n"))
        else:
            ui.write(_(" Internal patcher failure, please report this error"
                       " to http://mercurial.selenic.com/bts/\n"))
    problems += patchproblems

    os.unlink(fa)
    os.unlink(fd)

    # editor
    ui.status(_("Checking commit editor...\n"))
    editor = ui.geteditor()
    cmdpath = util.find_exe(editor) or util.find_exe(editor.split()[0])
    if not cmdpath:
        if editor == 'vi':
            ui.write(_(" No commit editor set and can't find vi in PATH\n"))
            ui.write(_(" (specify a commit editor in your .hgrc file)\n"))
        else:
            ui.write(_(" Can't find editor '%s' in PATH\n") % editor)
            ui.write(_(" (specify a commit editor in your .hgrc file)\n"))
            problems += 1

    # check username
    ui.status(_("Checking username...\n"))
    try:
        user = ui.username()
    except util.Abort, e:
        ui.write(" %s\n" % e)
        ui.write(_(" (specify a username in your .hgrc file)\n"))
        problems += 1

    if not problems:
        ui.status(_("No problems detected\n"))
    else:
        ui.write(_("%s problems detected,"
                   " please check your install!\n") % problems)

    return problems

def debugrename(ui, repo, file1, *pats, **opts):
    """dump rename information"""

    ctx = repo[opts.get('rev')]
    m = cmdutil.match(repo, (file1,) + pats, opts)
    for abs in ctx.walk(m):
        fctx = ctx[abs]
        o = fctx.filelog().renamed(fctx.filenode())
        rel = m.rel(abs)
        if o:
            ui.write(_("%s renamed from %s:%s\n") % (rel, o[0], hex(o[1])))
        else:
            ui.write(_("%s not renamed\n") % rel)

def debugwalk(ui, repo, *pats, **opts):
    """show how files match on given patterns"""
    m = cmdutil.match(repo, pats, opts)
    items = list(repo.walk(m))
    if not items:
        return
    fmt = 'f  %%-%ds  %%-%ds  %%s' % (
        max([len(abs) for abs in items]),
        max([len(m.rel(abs)) for abs in items]))
    for abs in items:
        line = fmt % (abs, m.rel(abs), m.exact(abs) and 'exact' or '')
        ui.write("%s\n" % line.rstrip())

def diff(ui, repo, *pats, **opts):
    """diff repository (or selected files)

    Show differences between revisions for the specified files.

    Differences between files are shown using the unified diff format.

    NOTE: 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 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'.
    """

    revs = opts.get('rev')
    change = opts.get('change')
    stat = opts.get('stat')
    reverse = opts.get('reverse')

    if revs and change:
        msg = _('cannot specify --rev and --change at the same time')
        raise util.Abort(msg)
    elif change:
        node2 = repo.lookup(change)
        node1 = repo[node2].parents()[0].node()
    else:
        node1, node2 = cmdutil.revpair(repo, revs)

    if reverse:
        node1, node2 = node2, node1

    if stat:
        opts['unified'] = '0'
    diffopts = patch.diffopts(ui, opts)

    m = cmdutil.match(repo, pats, opts)
    it = patch.diff(repo, node1, node2, match=m, opts=diffopts)
    if stat:
        width = ui.interactive() and util.termwidth() or 80
        ui.write(patch.diffstat(util.iterlines(it), width=width,
                                git=diffopts.git))
    else:
        for chunk in it:
            ui.write(chunk)

def export(ui, repo, *changesets, **opts):
    """dump the header and diffs for one or more changesets

    Print the changeset header and diffs for one or more revisions.

    The information shown in the changeset header is: author,
    changeset hash, parent(s) and commit comment.

    NOTE: export may generate unexpected diff output for merge
    changesets, as it will compare the merge changeset against its
    first parent only.

    Output may be to a file, in which case the name of the file is
    given using a format string. The formatting rules are as follows:

    :``%%``: literal "%" character
    :``%H``: changeset hash (40 bytes of hexadecimal)
    :``%N``: number of patches being generated
    :``%R``: changeset revision number
    :``%b``: basename of the exporting repository
    :``%h``: short-form changeset hash (12 bytes of hexadecimal)
    :``%n``: zero-padded sequence number, starting at 1
    :``%r``: zero-padded changeset revision number

    Without the -a/--text option, export will avoid generating diffs
    of files it detects as binary. With -a, export will generate a
    diff anyway, probably with undesirable results.

    Use the -g/--git option to generate diffs in the git extended diff
    format. See 'hg help diffs' for more information.

    With the --switch-parent option, the diff will be against the
    second parent. It can be useful to review a merge.
    """
    if not changesets:
        raise util.Abort(_("export requires at least one changeset"))
    revs = cmdutil.revrange(repo, changesets)
    if len(revs) > 1:
        ui.note(_('exporting patches:\n'))
    else:
        ui.note(_('exporting patch:\n'))
    patch.export(repo, revs, template=opts.get('output'),
                 switch_parent=opts.get('switch_parent'),
                 opts=patch.diffopts(ui, opts))

def forget(ui, repo, *pats, **opts):
    """forget the specified files on the next commit

    Mark the specified files so they will no longer be tracked
    after the next commit.

    This only removes files from the current branch, not from the
    entire project history, and it does not delete them from the
    working directory.

    To undo a forget before the next commit, see hg add.
    """

    if not pats:
        raise util.Abort(_('no files specified'))

    m = cmdutil.match(repo, pats, opts)
    s = repo.status(match=m, clean=True)
    forget = sorted(s[0] + s[1] + s[3] + s[6])

    for f in m.files():
        if f not in repo.dirstate and not os.path.isdir(m.rel(f)):
            ui.warn(_('not removing %s: file is already untracked\n')
                    % m.rel(f))

    for f in forget:
        if ui.verbose or not m.exact(f):
            ui.status(_('removing %s\n') % m.rel(f))

    repo.remove(forget, unlink=False)

def grep(ui, repo, pattern, *pats, **opts):
    """search for a pattern in specified files and revisions

    Search revisions of files for a regular expression.

    This command behaves differently than Unix grep. It only accepts
    Python/Perl regexps. It searches repository history, not the
    working directory. It always prints the revision number in which a
    match appears.

    By default, grep only prints output for the first revision of a
    file in which it finds a match. To get it to print every revision
    that contains a change in match status ("-" for a match that
    becomes a non-match, or "+" for a non-match that becomes a match),
    use the --all flag.
    """
    reflags = 0
    if opts.get('ignore_case'):
        reflags |= re.I
    try:
        regexp = re.compile(pattern, reflags)
    except Exception, inst:
        ui.warn(_("grep: invalid match pattern: %s\n") % inst)
        return None
    sep, eol = ':', '\n'
    if opts.get('print0'):
        sep = eol = '\0'

    getfile = util.lrucachefunc(repo.file)

    def matchlines(body):
        begin = 0
        linenum = 0
        while True:
            match = regexp.search(body, begin)
            if not match:
                break
            mstart, mend = match.span()
            linenum += body.count('\n', begin, mstart) + 1
            lstart = body.rfind('\n', begin, mstart) + 1 or begin
            begin = body.find('\n', mend) + 1 or len(body)
            lend = begin - 1
            yield linenum, mstart - lstart, mend - lstart, body[lstart:lend]

    class linestate(object):
        def __init__(self, line, linenum, colstart, colend):
            self.line = line
            self.linenum = linenum
            self.colstart = colstart
            self.colend = colend

        def __hash__(self):
            return hash((self.linenum, self.line))

        def __eq__(self, other):
            return self.line == other.line

    matches = {}
    copies = {}
    def grepbody(fn, rev, body):
        matches[rev].setdefault(fn, [])
        m = matches[rev][fn]
        for lnum, cstart, cend, line in matchlines(body):
            s = linestate(line, lnum, cstart, cend)
            m.append(s)

    def difflinestates(a, b):
        sm = difflib.SequenceMatcher(None, a, b)
        for tag, alo, ahi, blo, bhi in sm.get_opcodes():
            if tag == 'insert':
                for i in xrange(blo, bhi):
                    yield ('+', b[i])
            elif tag == 'delete':
                for i in xrange(alo, ahi):
                    yield ('-', a[i])
            elif tag == 'replace':
                for i in xrange(alo, ahi):
                    yield ('-', a[i])
                for i in xrange(blo, bhi):
                    yield ('+', b[i])

    def display(fn, ctx, pstates, states):
        rev = ctx.rev()
        datefunc = ui.quiet and util.shortdate or util.datestr
        found = False
        filerevmatches = {}
        if opts.get('all'):
            iter = difflinestates(pstates, states)
        else:
            iter = [('', l) for l in states]
        for change, l in iter:
            cols = [fn, str(rev)]
            if opts.get('line_number'):
                cols.append(str(l.linenum))
            if opts.get('all'):
                cols.append(change)
            if opts.get('user'):
                cols.append(ui.shortuser(ctx.user()))
            if opts.get('date'):
                cols.append(datefunc(ctx.date()))
            if opts.get('files_with_matches'):
                c = (fn, rev)
                if c in filerevmatches:
                    continue
                filerevmatches[c] = 1
            else:
                cols.append(l.line)
            ui.write(sep.join(cols), eol)
            found = True
        return found

    skip = {}
    revfiles = {}
    matchfn = cmdutil.match(repo, pats, opts)
    found = False
    follow = opts.get('follow')

    def prep(ctx, fns):
        rev = ctx.rev()
        pctx = ctx.parents()[0]
        parent = pctx.rev()
        matches.setdefault(rev, {})
        matches.setdefault(parent, {})
        files = revfiles.setdefault(rev, [])
        for fn in fns:
            flog = getfile(fn)
            try:
                fnode = ctx.filenode(fn)
            except error.LookupError:
                continue

            copied = flog.renamed(fnode)
            copy = follow and copied and copied[0]
            if copy:
                copies.setdefault(rev, {})[fn] = copy
            if fn in skip:
                if copy:
                    skip[copy] = True
                continue
            files.append(fn)

            if fn not in matches[rev]:
                grepbody(fn, rev, flog.read(fnode))

            pfn = copy or fn
            if pfn not in matches[parent]:
                try:
                    fnode = pctx.filenode(pfn)
                    grepbody(pfn, parent, flog.read(fnode))
                except error.LookupError:
                    pass

    for ctx in cmdutil.walkchangerevs(repo, matchfn, opts, prep):
        rev = ctx.rev()
        parent = ctx.parents()[0].rev()
        for fn in sorted(revfiles.get(rev, [])):
            states = matches[rev][fn]
            copy = copies.get(rev, {}).get(fn)
            if fn in skip:
                if copy:
                    skip[copy] = True
                continue
            pstates = matches.get(parent, {}).get(copy or fn, [])
            if pstates or states:
                r = display(fn, ctx, pstates, states)
                found = found or r
                if r and not opts.get('all'):
                    skip[fn] = True
                    if copy:
                        skip[copy] = True
        del matches[rev]
        del revfiles[rev]

def heads(ui, repo, *branchrevs, **opts):
    """show current repository heads or show branch heads

    With no arguments, show all repository head changesets.

    Repository "heads" are changesets with no child changesets. They are
    where development generally takes place and are the usual targets
    for update and merge operations.

    If one or more REV is given, the "branch heads" will be shown for
    the named branch associated with the specified changeset(s).

    Branch heads are changesets on a named branch with no descendants on
    the same branch. A branch head could be a "true" (repository) head,
    or it could be the last changeset on that branch before it was
    merged into another branch, or it could be the last changeset on the
    branch before a new branch was created. If none of the branch heads
    are true heads, the branch is considered inactive.

    If -c/--closed is specified, also show branch heads marked closed
    (see hg commit --close-branch).

    If STARTREV is specified, only those heads that are descendants of
    STARTREV will be displayed.
    """
    if opts.get('rev'):
        start = repo.lookup(opts['rev'])
    else:
        start = None
    closed = opts.get('closed')
    hideinactive, _heads = opts.get('active'), None
    if not branchrevs:
        if closed:
            raise error.Abort(_('you must specify a branch to use --closed'))
        # Assume we're looking repo-wide heads if no revs were specified.
        heads = repo.heads(start)
    else:
        if hideinactive:
            _heads = repo.heads(start)
        heads = []
        visitedset = set()
        for branchrev in branchrevs:
            branch = repo[encoding.fromlocal(branchrev)].branch()
            encodedbranch = encoding.tolocal(branch)
            if branch in visitedset:
                continue
            visitedset.add(branch)
            bheads = repo.branchheads(branch, start, closed=closed)
            if not bheads:
                if not opts.get('rev'):
                    ui.warn(_("no open branch heads on branch %s\n") % encodedbranch)
                elif branch != branchrev:
                    ui.warn(_("no changes on branch %s containing %s are "
                              "reachable from %s\n")
                            % (encodedbranch, branchrev, opts.get('rev')))
                else:
                    ui.warn(_("no changes on branch %s are reachable from %s\n")
                            % (encodedbranch, opts.get('rev')))
            if hideinactive:
                bheads = [bhead for bhead in bheads if bhead in _heads]
            heads.extend(bheads)
    if not heads:
        return 1
    displayer = cmdutil.show_changeset(ui, repo, opts)
    for n in heads:
        displayer.show(repo[n])

def help_(ui, name=None, with_version=False):
    """show help for a given topic or a help overview

    With no arguments, print a list of commands with short help messages.

    Given a topic, extension, or command name, print help for that
    topic."""
    option_lists = []
    textwidth = util.termwidth() - 2

    def addglobalopts(aliases):
        if ui.verbose:
            option_lists.append((_("global options:"), globalopts))
            if name == 'shortlist':
                option_lists.append((_('use "hg help" for the full list '
                                       'of commands'), ()))
        else:
            if name == 'shortlist':
                msg = _('use "hg help" for the full list of commands '
                        'or "hg -v" for details')
            elif aliases:
                msg = _('use "hg -v help%s" to show aliases and '
                        'global options') % (name and " " + name or "")
            else:
                msg = _('use "hg -v help %s" to show global options') % name
            option_lists.append((msg, ()))

    def helpcmd(name):
        if with_version:
            version_(ui)
            ui.write('\n')

        try:
            aliases, i = cmdutil.findcmd(name, table, False)
        except error.AmbiguousCommand, inst:
            # py3k 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: c.lstrip('^').startswith(prefix)
            helplist(_('list of commands:\n\n'), select)
            return

        # synopsis
        if len(i) > 2:
            if i[2].startswith('hg'):
                ui.write("%s\n" % i[2])
            else:
                ui.write('hg %s %s\n' % (aliases[0], i[2]))
        else:
            ui.write('hg %s\n' % aliases[0])

        # aliases
        if not ui.quiet and len(aliases) > 1:
            ui.write(_("\naliases: %s\n") % ', '.join(aliases[1:]))

        # description
        doc = gettext(i[0].__doc__)
        if not doc:
            doc = _("(no help text available)")
        if ui.quiet:
            doc = doc.splitlines()[0]
        ui.write("\n%s\n" % minirst.format(doc, textwidth))

        if not ui.quiet:
            # options
            if i[1]:
                option_lists.append((_("options:\n"), i[1]))

            addglobalopts(False)

    def helplist(header, select=None):
        h = {}
        cmds = {}
        for c, e in table.iteritems():
            f = c.split("|", 1)[0]
            if select and not select(f):
                continue
            if (not select and name != 'shortlist' and
                e[0].__module__ != __name__):
                continue
            if name == "shortlist" and not f.startswith("^"):
                continue
            f = f.lstrip("^")
            if not ui.debugflag and f.startswith("debug"):
                continue
            doc = e[0].__doc__
            if doc and 'DEPRECATED' in doc and not ui.verbose:
                continue
            doc = gettext(doc)
            if not doc:
                doc = _("(no help text available)")
            h[f] = doc.splitlines()[0].rstrip()
            cmds[f] = c.lstrip("^")

        if not h:
            ui.status(_('no commands defined\n'))
            return

        ui.status(header)
        fns = sorted(h)
        m = max(map(len, fns))
        for f in fns:
            if ui.verbose:
                commands = cmds[f].replace("|",", ")
                ui.write(" %s:\n      %s\n"%(commands, h[f]))
            else:
                ui.write(' %-*s   %s\n' % (m, f, util.wrap(h[f], m + 4)))

        if not ui.quiet:
            addglobalopts(True)

    def helptopic(name):
        for names, header, doc in help.helptable:
            if name in names:
                break
        else:
            raise error.UnknownCommand(name)

        # description
        if not doc:
            doc = _("(no help text available)")
        if hasattr(doc, '__call__'):
            doc = doc()

        ui.write("%s\n\n" % header)
        ui.write("%s\n" % minirst.format(doc, textwidth, indent=4))

    def helpext(name):
        try:
            mod = extensions.find(name)
        except KeyError:
            raise error.UnknownCommand(name)

        doc = gettext(mod.__doc__) or _('no help text available')
        if '\n' not in doc:
            head, tail = doc, ""
        else:
            head, tail = doc.split('\n', 1)
        ui.write(_('%s extension - %s\n\n') % (name.split('.')[-1], head))
        if tail:
            ui.write(minirst.format(tail, textwidth))
            ui.status('\n\n')

        try:
            ct = mod.cmdtable
        except AttributeError:
            ct = {}

        modcmds = set([c.split('|', 1)[0] for c in ct])
        helplist(_('list of commands:\n\n'), modcmds.__contains__)

    if name and name != 'shortlist':
        i = None
        for f in (helptopic, helpcmd, helpext):
            try:
                f(name)
                i = None
                break
            except error.UnknownCommand, inst:
                i = inst
        if i:
            raise i

    else:
        # program name
        if ui.verbose or with_version:
            version_(ui)
        else:
            ui.status(_("Mercurial Distributed SCM\n"))
        ui.status('\n')

        # list of commands
        if name == "shortlist":
            header = _('basic commands:\n\n')
        else:
            header = _('list of commands:\n\n')

        helplist(header)
        if name != 'shortlist':
            exts, maxlength = extensions.enabled()
            text = help.listexts(_('enabled extensions:'), exts, maxlength)
            if text:
                ui.write("\n%s\n" % minirst.format(text, textwidth))

    # list all option lists
    opt_output = []
    for title, options in option_lists:
        opt_output.append(("\n%s" % title, None))
        for shortopt, longopt, default, desc in options:
            if _("DEPRECATED") in desc and not ui.verbose: continue
            opt_output.append(("%2s%s" % (shortopt and "-%s" % shortopt,
                                          longopt and " --%s" % longopt),
                               "%s%s" % (desc,
                                         default
                                         and _(" (default: %s)") % default
                                         or "")))

    if not name:
        ui.write(_("\nadditional help topics:\n\n"))
        topics = []
        for names, header, doc in help.helptable:
            topics.append((sorted(names, key=len, reverse=True)[0], header))
        topics_len = max([len(s[0]) for s in topics])
        for t, desc in topics:
            ui.write(" %-*s  %s\n" % (topics_len, t, desc))

    if opt_output:
        opts_len = max([len(line[0]) for line in opt_output if line[1]] or [0])
        for first, second in opt_output:
            if second:
                second = util.wrap(second, opts_len + 3)
                ui.write(" %-*s  %s\n" % (opts_len, first, second))
            else:
                ui.write("%s\n" % first)

def identify(ui, repo, source=None,
             rev=None, num=None, id=None, branch=None, tags=None):
    """identify the working copy or specified revision

    With no revision, print a summary of the current state of the
    repository.

    Specifying a path to a repository root or Mercurial bundle will
    cause lookup to operate on that repository/bundle.

    This summary identifies the repository state using one or two
    parent hash identifiers, followed by a "+" if there are
    uncommitted changes in the working directory, a list of tags for
    this revision and a branch name for non-default branches.
    """

    if not repo and not source:
        raise util.Abort(_("There is no Mercurial repository here "
                           "(.hg not found)"))

    hexfunc = ui.debugflag and hex or short
    default = not (num or id or branch or tags)
    output = []

    revs = []
    if source:
        source, revs, checkout = hg.parseurl(ui.expandpath(source), [])
        repo = hg.repository(ui, source)

    if not repo.local():
        if not rev and revs:
            rev = revs[0]
        if not rev:
            rev = "tip"
        if num or branch or tags:
            raise util.Abort(
                "can't query remote revision number, branch, or tags")
        output = [hexfunc(repo.lookup(rev))]
    elif not rev:
        ctx = repo[None]
        parents = ctx.parents()
        changed = False
        if default or id or num:
            changed = ctx.files() + ctx.deleted()
        if default or id:
            output = ["%s%s" % ('+'.join([hexfunc(p.node()) for p in parents]),
                                (changed) and "+" or "")]
        if num:
            output.append("%s%s" % ('+'.join([str(p.rev()) for p in parents]),
                                    (changed) and "+" or ""))
    else:
        ctx = repo[rev]
        if default or id:
            output = [hexfunc(ctx.node())]
        if num:
            output.append(str(ctx.rev()))

    if repo.local() and default and not ui.quiet:
        b = encoding.tolocal(ctx.branch())
        if b != 'default':
            output.append("(%s)" % b)

        # multiple tags for a single parent separated by '/'
        t = "/".join(ctx.tags())
        if t:
            output.append(t)

    if branch:
        output.append(encoding.tolocal(ctx.branch()))

    if tags:
        output.extend(ctx.tags())

    ui.write("%s\n" % ' '.join(output))

def import_(ui, repo, patch1, *patches, **opts):
    """import an ordered set of patches

    Import a list of patches and commit them individually (unless
    --no-commit is specified).

    If there are outstanding changes in the working directory, import
    will abort unless given the -f/--force flag.

    You can import a patch straight from a mail message. Even patches
    as attachments work (to use the body part, it must have type
    text/plain or text/x-patch). From and Subject headers of email
    message are used as default committer and commit message. All
    text/plain body parts before first diff are added to commit
    message.

    If the imported patch was generated by hg export, user and
    description from patch override values from message headers and
    body. Values given on command line with -m/--message and -u/--user
    override these.

    If --exact is specified, import will set the working directory to
    the parent of each patch before applying it, and will abort if the
    resulting changeset has a different ID than the one recorded in
    the patch. This may happen due to character set problems or other
    deficiencies in the text patch format.

    With -s/--similarity, hg will attempt to discover renames and
    copies in the patch in the same way as 'addremove'.

    To read a patch from standard input, use "-" as the patch name. If
    a URL is specified, the patch will be downloaded from it.
    See 'hg help dates' for a list of formats valid for -d/--date.
    """
    patches = (patch1,) + patches

    date = opts.get('date')
    if date:
        opts['date'] = util.parsedate(date)

    try:
        sim = float(opts.get('similarity') or 0)
    except ValueError:
        raise util.Abort(_('similarity must be a number'))
    if sim < 0 or sim > 100:
        raise util.Abort(_('similarity must be between 0 and 100'))

    if opts.get('exact') or not opts.get('force'):
        cmdutil.bail_if_changed(repo)

    d = opts["base"]
    strip = opts["strip"]
    wlock = lock = None
    try:
        wlock = repo.wlock()
        lock = repo.lock()
        for p in patches:
            pf = os.path.join(d, p)

            if pf == '-':
                ui.status(_("applying patch from stdin\n"))
                pf = sys.stdin
            else:
                ui.status(_("applying %s\n") % p)
                pf = url.open(ui, pf)
            data = patch.extract(ui, pf)
            tmpname, message, user, date, branch, nodeid, p1, p2 = data

            if tmpname is None:
                raise util.Abort(_('no diffs found'))

            try:
                cmdline_message = cmdutil.logmessage(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('message:\n%s\n' % message)

                wp = repo.parents()
                if opts.get('exact'):
                    if not nodeid or not p1:
                        raise util.Abort(_('not a Mercurial patch'))
                    p1 = repo.lookup(p1)
                    p2 = repo.lookup(p2 or hex(nullid))

                    if p1 != wp[0].node():
                        hg.clean(repo, p1)
                    repo.dirstate.setparents(p1, p2)
                elif p2:
                    try:
                        p1 = repo.lookup(p1)
                        p2 = repo.lookup(p2)
                        if p1 == wp[0].node():
                            repo.dirstate.setparents(p1, p2)
                    except error.RepoError:
                        pass
                if opts.get('exact') or opts.get('import_branch'):
                    repo.dirstate.setbranch(branch or 'default')

                files = {}
                try:
                    patch.patch(tmpname, ui, strip=strip, cwd=repo.root,
                                files=files, eolmode=None)
                finally:
                    files = patch.updatedir(ui, repo, files, similarity=sim/100.)
                if not opts.get('no_commit'):
                    m = cmdutil.matchfiles(repo, files or [])
                    n = repo.commit(message, opts.get('user') or user,
                                    opts.get('date') or date, match=m,
                                    editor=cmdutil.commiteditor)
                    if opts.get('exact'):
                        if hex(n) != nodeid:
                            repo.rollback()
                            raise util.Abort(_('patch is damaged'
                                               ' or loses information'))
                    # Force a dirstate write so that the next transaction
                    # backups an up-do-date file.
                    repo.dirstate.write()
            finally:
                os.unlink(tmpname)
    finally:
        release(lock, wlock)

def incoming(ui, repo, source="default", **opts):
    """show new changesets found in source

    Show new changesets found in the specified path/URL or the default
    pull location. These are the changesets that would have been pulled
    if a pull at the time you issued this command.

    For remote repository, using --bundle avoids downloading the
    changesets twice if the incoming is followed by a pull.

    See pull for valid source format details.
    """
    limit = cmdutil.loglimit(opts)
    source, revs, checkout = hg.parseurl(ui.expandpath(source), opts.get('rev'))
    other = hg.repository(cmdutil.remoteui(repo, opts), source)
    ui.status(_('comparing with %s\n') % url.hidepassword(source))
    if revs:
        revs = [other.lookup(rev) for rev in revs]
    common, incoming, rheads = repo.findcommonincoming(other, heads=revs,
                                                       force=opts["force"])
    if not incoming:
        try:
            os.unlink(opts["bundle"])
        except:
            pass
        ui.status(_("no changes found\n"))
        return 1

    cleanup = None
    try:
        fname = opts["bundle"]
        if fname or not other.local():
            # create a bundle (uncompressed if other repo is not local)

            if revs is None and other.capable('changegroupsubset'):
                revs = rheads

            if revs is None:
                cg = other.changegroup(incoming, "incoming")
            else:
                cg = other.changegroupsubset(incoming, revs, 'incoming')
            bundletype = other.local() and "HG10BZ" or "HG10UN"
            fname = cleanup = changegroup.writebundle(cg, fname, bundletype)
            # keep written bundle?
            if opts["bundle"]:
                cleanup = None
            if not other.local():
                # use the created uncompressed bundlerepo
                other = bundlerepo.bundlerepository(ui, repo.root, fname)

        o = other.changelog.nodesbetween(incoming, revs)[0]
        if opts.get('newest_first'):
            o.reverse()
        displayer = cmdutil.show_changeset(ui, other, opts)
        count = 0
        for n in o:
            if count >= limit:
                break
            parents = [p for p in other.changelog.parents(n) if p != nullid]
            if opts.get('no_merges') and len(parents) == 2:
                continue
            count += 1
            displayer.show(other[n])
    finally:
        if hasattr(other, 'close'):
            other.close()
        if cleanup:
            os.unlink(cleanup)

def init(ui, dest=".", **opts):
    """create a new repository in the given directory

    Initialize a new repository in the given directory. If the given
    directory does not exist, it will be created.

    If no directory is given, the current directory is used.

    It is possible to specify an ``ssh://`` URL as the destination.
    See 'hg help urls' for more information.
    """
    hg.repository(cmdutil.remoteui(ui, opts), dest, create=1)

def locate(ui, repo, *pats, **opts):
    """locate files matching specific patterns

    Print files under Mercurial control in the working directory whose
    names match the given patterns.

    By default, this command searches all directories in the working
    directory. To search just the current directory and its
    subdirectories, use "--include .".

    If no patterns are given to match, this command prints the names
    of all files under Mercurial control in the working directory.

    If you want to feed the output of this command into the "xargs"
    command, use the -0 option to both this command and "xargs". This
    will avoid the problem of "xargs" treating single filenames that
    contain whitespace as multiple filenames.
    """
    end = opts.get('print0') and '\0' or '\n'
    rev = opts.get('rev') or None

    ret = 1
    m = cmdutil.match(repo, pats, opts, default='relglob')
    m.bad = lambda x,y: False
    for abs in repo[rev].walk(m):
        if not rev and abs not in repo.dirstate:
            continue
        if opts.get('fullpath'):
            ui.write(repo.wjoin(abs), end)
        else:
            ui.write(((pats and m.rel(abs)) or abs), end)
        ret = 0

    return ret

def log(ui, repo, *pats, **opts):
    """show revision history of entire repository or files

    Print the revision history of the specified files or the entire
    project.

    File history is shown without following rename or copy history of
    files. Use -f/--follow with a filename to follow history across
    renames and copies. --follow without a filename will only show
    ancestors or descendants of the starting revision. --follow-first
    only follows the first parent of merge revisions.

    If no revision range is specified, the default is tip:0 unless
    --follow is set, in which case the working directory parent is
    used as the starting revision.

    See 'hg help dates' for a list of formats valid for -d/--date.

    By default this command prints revision number and changeset id,
    tags, non-trivial parents, user, date and time, and a summary for
    each commit. When the -v/--verbose switch is used, the list of
    changed files and full commit message are shown.

    NOTE: log -p/--patch may generate unexpected diff output for merge
    changesets, as it will only compare the merge changeset against
    its first parent. Also, only files different from BOTH parents
    will appear in files:.
    """

    matchfn = cmdutil.match(repo, pats, opts)
    limit = cmdutil.loglimit(opts)
    count = 0

    if opts.get('copies') and opts.get('rev'):
        endrev = max(cmdutil.revrange(repo, opts.get('rev'))) + 1
    else:
        endrev = len(repo)
    rcache = {}
    ncache = {}
    def getrenamed(fn, rev):
        '''looks up all renames for a file (up to endrev) the first
        time the file is given. It indexes on the changerev and only
        parses the manifest if linkrev != changerev.
        Returns rename info for fn at changerev rev.'''
        if fn not in rcache:
            rcache[fn] = {}
            ncache[fn] = {}
            fl = repo.file(fn)
            for i in fl:
                node = fl.node(i)
                lr = fl.linkrev(i)
                renamed = fl.renamed(node)
                rcache[fn][lr] = renamed
                if renamed:
                    ncache[fn][node] = renamed
                if lr >= endrev:
                    break
        if rev in rcache[fn]:
            return rcache[fn][rev]

        # If linkrev != rev (i.e. rev not found in rcache) fallback to
        # filectx logic.

        try:
            return repo[rev][fn].renamed()
        except error.LookupError:
            pass
        return None

    df = False
    if opts["date"]:
        df = util.matchdate(opts["date"])

    displayer = cmdutil.show_changeset(ui, repo, opts, True, matchfn)
    def prep(ctx, fns):
        rev = ctx.rev()
        parents = [p for p in repo.changelog.parentrevs(rev)
                   if p != nullrev]
        if opts.get('no_merges') and len(parents) == 2:
            return
        if opts.get('only_merges') and len(parents) != 2:
            return
        if opts.get('only_branch') and ctx.branch() not in opts['only_branch']:
            return
        if df and not df(ctx.date()[0]):
            return
        if opts['user'] and not [k for k in opts['user'] if k in ctx.user()]:
            return
        if opts.get('keyword'):
            for k in [kw.lower() for kw in opts['keyword']]:
                if (k in ctx.user().lower() or
                    k in ctx.description().lower() or
                    k in " ".join(ctx.files()).lower()):
                    break
            else:
                return

        copies = []
        if opts.get('copies') and rev:
            for fn in ctx.files():
                rename = getrenamed(fn, rev)
                if rename:
                    copies.append((fn, rename[0]))

        displayer.show(ctx, copies=copies)

    for ctx in cmdutil.walkchangerevs(repo, matchfn, opts, prep):
        if count == limit:
            break
        if displayer.flush(ctx.rev()):
            count += 1

def manifest(ui, repo, node=None, rev=None):
    """output the current or given revision of the project manifest

    Print a list of version controlled files for the given revision.
    If no revision is given, the first parent of the working directory
    is used, or the null revision if no revision is checked out.

    With -v, print file permissions, symlink and executable bits.
    With --debug, print file revision hashes.
    """

    if rev and node:
        raise util.Abort(_("please specify just one revision"))

    if not node:
        node = rev

    decor = {'l':'644 @ ', 'x':'755 * ', '':'644   '}
    ctx = repo[node]
    for f in ctx:
        if ui.debugflag:
            ui.write("%40s " % hex(ctx.manifest()[f]))
        if ui.verbose:
            ui.write(decor[ctx.flags(f)])
        ui.write("%s\n" % f)

def merge(ui, repo, node=None, **opts):
    """merge working directory with another revision

    The current working directory is updated with all changes made in
    the requested revision since the last common predecessor revision.

    Files that changed between either parent are marked as changed for
    the next commit and a commit must be performed before any further
    updates to the repository are allowed. The next commit will have
    two parents.

    If no revision is specified, the working directory's parent is a
    head revision, and the current branch contains exactly one other
    head, the other head is merged with by default. Otherwise, an
    explicit revision with which to merge with must be provided.
    """

    if opts.get('rev') and node:
        raise util.Abort(_("please specify just one revision"))
    if not node:
        node = opts.get('rev')

    if not node:
        branch = repo.changectx(None).branch()
        bheads = repo.branchheads(branch)
        if len(bheads) > 2:
            raise util.Abort(_("branch '%s' has %d heads - "
                               "please merge with an explicit rev") %
                             (branch, len(bheads)))

        parent = repo.dirstate.parents()[0]
        if len(bheads) == 1:
            if len(repo.heads()) > 1:
                raise util.Abort(_("branch '%s' has one head - "
                                   "please merge with an explicit rev") %
                                 branch)
            msg = _('there is nothing to merge')
            if parent != repo.lookup(repo[None].branch()):
                msg = _('%s - use "hg update" instead') % msg
            raise util.Abort(msg)

        if parent not in bheads:
            raise util.Abort(_('working dir not at a head rev - '
                               'use "hg update" or merge with an explicit rev'))
        node = parent == bheads[0] and bheads[-1] or bheads[0]

    if opts.get('preview'):
        p1 = repo['.']
        p2 = repo[node]
        common = p1.ancestor(p2)
        roots, heads = [common.node()], [p2.node()]
        displayer = cmdutil.show_changeset(ui, repo, opts)
        for node in repo.changelog.nodesbetween(roots=roots, heads=heads)[0]:
            if node not in roots:
                displayer.show(repo[node])
        return 0

    return hg.merge(repo, node, force=opts.get('force'))

def outgoing(ui, repo, dest=None, **opts):
    """show changesets not found in destination

    Show changesets not found in the specified destination repository
    or the default push location. These are the changesets that would
    be pushed if a push was requested.

    See pull for valid destination format details.
    """
    limit = cmdutil.loglimit(opts)
    dest, revs, checkout = hg.parseurl(
        ui.expandpath(dest or 'default-push', dest or 'default'), opts.get('rev'))
    if revs:
        revs = [repo.lookup(rev) for rev in revs]

    other = hg.repository(cmdutil.remoteui(repo, opts), dest)
    ui.status(_('comparing with %s\n') % url.hidepassword(dest))
    o = repo.findoutgoing(other, force=opts.get('force'))
    if not o:
        ui.status(_("no changes found\n"))
        return 1
    o = repo.changelog.nodesbetween(o, revs)[0]
    if opts.get('newest_first'):
        o.reverse()
    displayer = cmdutil.show_changeset(ui, repo, opts)
    count = 0
    for n in o:
        if count >= limit:
            break
        parents = [p for p in repo.changelog.parents(n) if p != nullid]
        if opts.get('no_merges') and len(parents) == 2:
            continue
        count += 1
        displayer.show(repo[n])

def parents(ui, repo, file_=None, **opts):
    """show the parents of the working directory or revision

    Print the working directory's parent revisions. If a revision is
    given via -r/--rev, the parent of that revision will be printed.
    If a file argument is given, the revision in which the file was
    last changed (before the working directory revision or the
    argument to --rev if given) is printed.
    """
    rev = opts.get('rev')
    if rev:
        ctx = repo[rev]
    else:
        ctx = repo[None]

    if file_:
        m = cmdutil.match(repo, (file_,), opts)
        if m.anypats() or len(m.files()) != 1:
            raise util.Abort(_('can only specify an explicit filename'))
        file_ = m.files()[0]
        filenodes = []
        for cp in ctx.parents():
            if not cp:
                continue
            try:
                filenodes.append(cp.filenode(file_))
            except error.LookupError:
                pass
        if not filenodes:
            raise util.Abort(_("'%s' not found in manifest!") % file_)
        fl = repo.file(file_)
        p = [repo.lookup(fl.linkrev(fl.rev(fn))) for fn in filenodes]
    else:
        p = [cp.node() for cp in ctx.parents()]

    displayer = cmdutil.show_changeset(ui, repo, opts)
    for n in p:
        if n != nullid:
            displayer.show(repo[n])

def paths(ui, repo, search=None):
    """show aliases for remote repositories

    Show definition of symbolic path name NAME. If no name is given,
    show definition of all available names.

    Path names are defined in the [paths] section of /etc/mercurial/hgrc
    and $HOME/.hgrc. If run inside a repository, .hg/hgrc is used, too.

    See 'hg help urls' for more information.
    """
    if search:
        for name, path in ui.configitems("paths"):
            if name == search:
                ui.write("%s\n" % url.hidepassword(path))
                return
        ui.warn(_("not found!\n"))
        return 1
    else:
        for name, path in ui.configitems("paths"):
            ui.write("%s = %s\n" % (name, url.hidepassword(path)))

def postincoming(ui, repo, modheads, optupdate, checkout):
    if modheads == 0:
        return
    if optupdate:
        if (modheads <= 1 or len(repo.branchheads()) == 1) or checkout:
            return hg.update(repo, checkout)
        else:
            ui.status(_("not updating, since new heads added\n"))
    if modheads > 1:
        ui.status(_("(run 'hg heads' to see heads, 'hg merge' to merge)\n"))
    else:
        ui.status(_("(run 'hg update' to get a working copy)\n"))

def pull(ui, repo, source="default", **opts):
    """pull changes from the specified source

    Pull changes from a remote repository to a local one.

    This finds all changes from the repository at the specified path
    or URL and adds them to a local repository (the current one unless
    -R is specified). By default, this does not update the copy of the
    project in the working directory.

    Use hg incoming if you want to see what would have been added by a
    pull at the time you issued this command. If you then decide to
    added those changes to the repository, you should use pull -r X
    where X is the last changeset listed by hg incoming.

    If SOURCE is omitted, the 'default' path will be used.
    See 'hg help urls' for more information.
    """
    source, revs, checkout = hg.parseurl(ui.expandpath(source), opts.get('rev'))
    other = hg.repository(cmdutil.remoteui(repo, opts), source)
    ui.status(_('pulling from %s\n') % url.hidepassword(source))
    if revs:
        try:
            revs = [other.lookup(rev) for rev in revs]
        except error.CapabilityError:
            err = _("Other repository doesn't support revision lookup, "
                    "so a rev cannot be specified.")
            raise util.Abort(err)

    modheads = repo.pull(other, heads=revs, force=opts.get('force'))
    if checkout:
        checkout = str(repo.changelog.rev(other.lookup(checkout)))
    return postincoming(ui, repo, modheads, opts.get('update'), checkout)

def push(ui, repo, dest=None, **opts):
    """push changes to the specified destination

    Push changes from the local repository to the given destination.

    This is the symmetrical operation for pull. It moves changes from
    the current repository to a different one. If the destination is
    local this is identical to a pull in that directory from the
    current one.

    By default, push will refuse to run if it detects the result would
    increase the number of remote heads. This generally indicates the
    user forgot to pull and merge before pushing.

    If -r/--rev is used, the named revision and all its ancestors will
    be pushed to the remote repository.

    Please see 'hg help urls' for important details about ``ssh://``
    URLs. If DESTINATION is omitted, a default path will be used.
    """
    dest, revs, checkout = hg.parseurl(
        ui.expandpath(dest or 'default-push', dest or 'default'), opts.get('rev'))
    other = hg.repository(cmdutil.remoteui(repo, opts), dest)
    ui.status(_('pushing to %s\n') % url.hidepassword(dest))
    if revs:
        revs = [repo.lookup(rev) for rev in revs]

    # push subrepos depth-first for coherent ordering
    c = repo['']
    subs = c.substate # only repos that are committed
    for s in sorted(subs):
        c.sub(s).push(opts.get('force'))

    r = repo.push(other, opts.get('force'), revs=revs)
    return r == 0

def recover(ui, repo):
    """roll back an interrupted transaction

    Recover from an interrupted commit or pull.

    This command tries to fix the repository status after an
    interrupted operation. It should only be necessary when Mercurial
    suggests it.
    """
    if repo.recover():
        return hg.verify(repo)
    return 1

def remove(ui, repo, *pats, **opts):
    """remove the specified files on the next commit

    Schedule the indicated files for removal from the repository.

    This only removes files from the current branch, not from the
    entire project history. -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.

    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)::

             A  C  M  !
      none   W  RD W  R
      -f     R  RD RD R
      -A     W  W  W  R
      -Af    R  R  R  R

    This command schedules the files to be removed at the next commit.
    To undo a remove before that, see hg revert.
    """

    after, force = opts.get('after'), opts.get('force')
    if not pats and not after:
        raise util.Abort(_('no files specified'))

    m = cmdutil.match(repo, pats, opts)
    s = repo.status(match=m, clean=True)
    modified, added, deleted, clean = s[0], s[1], s[3], s[6]

    for f in m.files():
        if f not in repo.dirstate and not os.path.isdir(m.rel(f)):
            ui.warn(_('not removing %s: file is untracked\n') % m.rel(f))

    def warn(files, reason):
        for f in files:
            ui.warn(_('not removing %s: file %s (use -f to force removal)\n')
                    % (m.rel(f), reason))

    if force:
        remove, forget = modified + deleted + clean, added
    elif after:
        remove, forget = deleted, []
        warn(modified + added + clean, _('still exists'))
    else:
        remove, forget = deleted + clean, []
        warn(modified, _('is modified'))
        warn(added, _('has been marked for add'))

    for f in sorted(remove + forget):
        if ui.verbose or not m.exact(f):
            ui.status(_('removing %s\n') % m.rel(f))

    repo.forget(forget)
    repo.remove(remove, unlink=not after)

def rename(ui, repo, *pats, **opts):
    """rename files; equivalent of copy + remove

    Mark dest as copies of sources; mark sources for deletion. If dest
    is a directory, copies are put in that directory. If dest is a
    file, there can only be one source.

    By default, this command copies the contents of files as they
    exist in the working directory. If invoked with -A/--after, the
    operation is recorded, but no copying is performed.

    This command takes effect at the next commit. To undo a rename
    before that, see hg revert.
    """
    wlock = repo.wlock(False)
    try:
        return cmdutil.copy(ui, repo, pats, opts, rename=True)
    finally:
        wlock.release()

def resolve(ui, repo, *pats, **opts):
    """retry file merges from a merge or update

    This command can cleanly retry unresolved file merges using file
    revisions preserved from the last update or merge.

    If a conflict is resolved manually, please note that the changes
    will be overwritten if the merge is retried with resolve. The
    -m/--mark switch should be used to mark the file as resolved.

    You can specify a set of files to operate on, or use the -a/--all
    switch to select all unresolved files.

    This command also allows listing resolved files and manually
    indicating whether or not files are resolved. All files must be
    marked as resolved before a commit is permitted.

    The codes used to show the status of files are::

      U = unresolved
      R = resolved
    """

    all, mark, unmark, show, nostatus = \
        [opts.get(o) for o in 'all mark unmark list no_status'.split()]

    if (show and (mark or unmark)) or (mark and unmark):
        raise util.Abort(_("too many options specified"))
    if pats and all:
        raise util.Abort(_("can't specify --all and patterns"))
    if not (all or pats or show or mark or unmark):
        raise util.Abort(_('no files or directories specified; '
                           'use --all to remerge all files'))

    ms = merge_.mergestate(repo)
    m = cmdutil.match(repo, pats, opts)

    for f in ms:
        if m(f):
            if show:
                if nostatus:
                    ui.write("%s\n" % f)
                else:
                    ui.write("%s %s\n" % (ms[f].upper(), f))
            elif mark:
                ms.mark(f, "r")
            elif unmark:
                ms.mark(f, "u")
            else:
                wctx = repo[None]
                mctx = wctx.parents()[-1]

                # backup pre-resolve (merge uses .orig for its own purposes)
                a = repo.wjoin(f)
                util.copyfile(a, a + ".resolve")

                # resolve file
                ms.resolve(f, wctx, mctx)

                # replace filemerge's .orig file with our resolve file
                util.rename(a + ".resolve", a + ".orig")

def revert(ui, repo, *pats, **opts):
    """restore individual files or directories to an earlier state

    (Use update -r to check out earlier revisions, revert does not
    change the working directory parents.)

    With no revision specified, revert the named files or directories
    to the contents they had in the parent of the working directory.
    This restores the contents of the affected files to an unmodified
    state and unschedules adds, removes, copies, and renames. If the
    working directory has two parents, you must explicitly specify the
    revision to revert to.

    Using the -r/--rev option, revert the given files or directories
    to their contents as of a specific revision. This can be helpful
    to "roll back" some or all of an earlier change. See 'hg help
    dates' for a list of formats valid for -d/--date.

    Revert modifies the working directory. It does not commit any
    changes, or change the parent of the working directory. If you
    revert to a revision other than the parent of the working
    directory, the reverted files will thus appear modified
    afterwards.

    If a file has been deleted, it is restored. If the executable mode
    of a file was changed, it is reset.

    If names are given, all files matching the names are reverted.
    If no arguments are given, no files are reverted.

    Modified files are saved with a .orig suffix before reverting.
    To disable these backups, use --no-backup.
    """

    if opts["date"]:
        if opts["rev"]:
            raise util.Abort(_("you can't specify a revision and a date"))
        opts["rev"] = cmdutil.finddate(ui, repo, opts["date"])

    if not pats and not opts.get('all'):
        raise util.Abort(_('no files or directories specified; '
                           'use --all to revert the whole repo'))

    parent, p2 = repo.dirstate.parents()
    if not opts.get('rev') and p2 != nullid:
        raise util.Abort(_('uncommitted merge - please provide a '
                           'specific revision'))
    ctx = repo[opts.get('rev')]
    node = ctx.node()
    mf = ctx.manifest()
    if node == parent:
        pmf = mf
    else:
        pmf = None

    # 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.

    names = {}

    wlock = repo.wlock()
    try:
        # walk dirstate.

        m = cmdutil.match(repo, pats, opts)
        m.bad = lambda x,y: False
        for abs in repo.walk(m):
            names[abs] = m.rel(abs), m.exact(abs)

        # walk target manifest.

        def badfn(path, msg):
            if path in names:
                return
            path_ = path + '/'
            for f in names:
                if f.startswith(path_):
                    return
            ui.warn("%s: %s\n" % (m.rel(path), msg))

        m = cmdutil.match(repo, pats, opts)
        m.bad = badfn
        for abs in repo[node].walk(m):
            if abs not in names:
                names[abs] = m.rel(abs), m.exact(abs)

        m = cmdutil.matchfiles(repo, names)
        changes = repo.status(match=m)[:4]
        modified, added, removed, deleted = map(set, changes)

        # if f is a rename, also revert the source
        cwd = repo.getcwd()
        for f in added:
            src = repo.dirstate.copied(f)
            if src and src not in names and repo.dirstate[src] == 'r':
                removed.add(src)
                names[src] = (repo.pathto(src, cwd), True)

        def removeforget(abs):
            if repo.dirstate[abs] == 'a':
                return _('forgetting %s\n')
            return _('removing %s\n')

        revert = ([], _('reverting %s\n'))
        add = ([], _('adding %s\n'))
        remove = ([], removeforget)
        undelete = ([], _('undeleting %s\n'))

        disptable = (
            # dispatch table:
            #   file state
            #   action if in target manifest
            #   action if not in target manifest
            #   make backup if in target manifest
            #   make backup if not in target manifest
            (modified, revert, remove, True, True),
            (added, revert, remove, True, False),
            (removed, undelete, None, False, False),
            (deleted, revert, remove, False, False),
            )

        for abs, (rel, exact) in sorted(names.items()):
            mfentry = mf.get(abs)
            target = repo.wjoin(abs)
            def handle(xlist, dobackup):
                xlist[0].append(abs)
                if dobackup and not opts.get('no_backup') and util.lexists(target):
                    bakname = "%s.orig" % rel
                    ui.note(_('saving current version of %s as %s\n') %
                            (rel, bakname))
                    if not opts.get('dry_run'):
                        util.copyfile(target, bakname)
                if ui.verbose or not exact:
                    msg = xlist[1]
                    if not isinstance(msg, basestring):
                        msg = msg(abs)
                    ui.status(msg % rel)
            for table, hitlist, misslist, backuphit, backupmiss in disptable:
                if abs not in table: continue
                # file has changed in dirstate
                if mfentry:
                    handle(hitlist, backuphit)
                elif misslist is not None:
                    handle(misslist, backupmiss)
                break
            else:
                if abs not in repo.dirstate:
                    if mfentry:
                        handle(add, True)
                    elif exact:
                        ui.warn(_('file not managed: %s\n') % rel)
                    continue
                # file has not changed in dirstate
                if node == parent:
                    if exact: ui.warn(_('no changes needed to %s\n') % rel)
                    continue
                if pmf is None:
                    # only need parent manifest in this unlikely case,
                    # so do not read by default
                    pmf = repo[parent].manifest()
                if abs in pmf:
                    if mfentry:
                        # if version of file is same in parent and target
                        # manifests, do nothing
                        if (pmf[abs] != mfentry or
                            pmf.flags(abs) != mf.flags(abs)):
                            handle(revert, False)
                    else:
                        handle(remove, False)

        if not opts.get('dry_run'):
            def checkout(f):
                fc = ctx[f]
                repo.wwrite(f, fc.data(), fc.flags())

            audit_path = util.path_auditor(repo.root)
            for f in remove[0]:
                if repo.dirstate[f] == 'a':
                    repo.dirstate.forget(f)
                    continue
                audit_path(f)
                try:
                    util.unlink(repo.wjoin(f))
                except OSError:
                    pass
                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
            for f in revert[0]:
                checkout(f)
                if normal:
                    normal(f)

            for f in add[0]:
                checkout(f)
                repo.dirstate.add(f)

            normal = repo.dirstate.normallookup
            if node == parent and p2 == nullid:
                normal = repo.dirstate.normal
            for f in undelete[0]:
                checkout(f)
                normal(f)

    finally:
        wlock.release()

def rollback(ui, repo):
    """roll back the last transaction

    This command should be used with care. There is only one level of
    rollback, and there is no way to undo a rollback. It will also
    restore the dirstate at the time of the last transaction, losing
    any dirstate changes since that time. This command does not alter
    the working directory.

    Transactions are used to encapsulate the effects of all commands
    that create new changesets or propagate existing changesets into a
    repository. For example, the following commands are transactional,
    and their effects can be rolled back:

    - commit
    - import
    - pull
    - push (with this repository as destination)
    - unbundle

    This command is not intended for use on public repositories. Once
    changes are visible for pull by other users, rolling a transaction
    back locally is ineffective (someone else may already have pulled
    the changes). Furthermore, a race is possible with readers of the
    repository; for example an in-progress pull from the repository
    may fail if a rollback is performed.
    """
    repo.rollback()

def root(ui, repo):
    """print the root (top) of the current working directory

    Print the root directory of the current repository.
    """
    ui.write(repo.root + "\n")

def serve(ui, repo, **opts):
    """export the repository via HTTP

    Start a local HTTP repository browser and pull server.

    By default, the server logs accesses to stdout and errors to
    stderr. Use the -A/--accesslog and -E/--errorlog options to log to
    files.
    """

    if opts["stdio"]:
        if repo is None:
            raise error.RepoError(_("There is no Mercurial repository here"
                              " (.hg not found)"))
        s = sshserver.sshserver(ui, repo)
        s.serve_forever()

    baseui = repo and repo.baseui or ui
    optlist = ("name templates style address port prefix ipv6"
               " accesslog errorlog webdir_conf certificate encoding")
    for o in optlist.split():
        if opts.get(o, None):
            baseui.setconfig("web", o, str(opts[o]))
            if (repo is not None) and (repo.ui != baseui):
                repo.ui.setconfig("web", o, str(opts[o]))

    if repo is None and not ui.config("web", "webdir_conf"):
        raise error.RepoError(_("There is no Mercurial repository here"
                                " (.hg not found)"))

    class service(object):
        def init(self):
            util.set_signal_handler()
            self.httpd = server.create_server(baseui, repo)

            if not ui.verbose: return

            if self.httpd.prefix:
                prefix = self.httpd.prefix.strip('/') + '/'
            else:
                prefix = ''

            port = ':%d' % self.httpd.port
            if port == ':80':
                port = ''

            bindaddr = self.httpd.addr
            if bindaddr == '0.0.0.0':
                bindaddr = '*'
            elif ':' in bindaddr: # IPv6
                bindaddr = '[%s]' % bindaddr

            fqaddr = self.httpd.fqaddr
            if ':' in fqaddr:
                fqaddr = '[%s]' % fqaddr
            ui.status(_('listening at http://%s%s/%s (bound to %s:%d)\n') %
                      (fqaddr, port, prefix, bindaddr, self.httpd.port))

        def run(self):
            self.httpd.serve_forever()

    service = service()

    cmdutil.service(opts, initfn=service.init, runfn=service.run)

def status(ui, repo, *pats, **opts):
    """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: 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 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 listed as A (added)
    """

    node1, node2 = cmdutil.revpair(repo, opts.get('rev'))
    cwd = (pats and repo.getcwd()) or ''
    end = opts.get('print0') and '\0' or '\n'
    copy = {}
    states = 'modified added removed deleted unknown ignored clean'.split()
    show = [k for k in states if opts.get(k)]
    if opts.get('all'):
        show += ui.quiet and (states[:4] + ['clean']) or states
    if not show:
        show = ui.quiet and states[:4] or states[:5]

    stat = repo.status(node1, node2, cmdutil.match(repo, pats, opts),
                       'ignored' in show, 'clean' in show, 'unknown' in show)
    changestates = zip(states, 'MAR!?IC', stat)

    if (opts.get('all') or opts.get('copies')) and not opts.get('no_status'):
        ctxn = repo[nullid]
        ctx1 = repo[node1]
        ctx2 = repo[node2]
        added = stat[1]
        if node2 is None:
            added = stat[0] + stat[1] # merged?

        for k, v in copies.copies(repo, ctx1, ctx2, ctxn)[0].iteritems():
            if k in added:
                copy[k] = v
            elif v in added:
                copy[v] = k

    for state, char, files in changestates:
        if state in show:
            format = "%s %%s%s" % (char, end)
            if opts.get('no_status'):
                format = "%%s%s" % end

            for f in files:
                ui.write(format % repo.pathto(f, cwd))
                if f in copy:
                    ui.write('  %s%s' % (repo.pathto(copy[f], cwd), end))

def summary(ui, repo, **opts):
    """summarize working directory state

    This generates a brief summary of the working directory state,
    including parents, branch, commit status, and available updates.

    With the --remote option, this will check the default paths for
    incoming and outgoing changes. This can be time-consuming.
    """

    ctx = repo[None]
    parents = ctx.parents()
    pnode = parents[0].node()
    tags = repo.tags()

    for p in parents:
        t = ' '.join([t for t in tags if tags[t] == p.node()])
        if p.rev() == -1:
            if not len(repo):
                t += _(' (empty repository)')
            else:
                t += _(' (no revision checked out)')
        ui.write(_('parent: %d:%s %s\n') % (p.rev(), str(p), t))
        if p.description():
            ui.status(' ' + p.description().splitlines()[0].strip() + '\n')

    branch = ctx.branch()
    bheads = repo.branchheads(branch)
    m = _('branch: %s\n') % branch
    if branch != 'default':
        ui.write(m)
    else:
        ui.status(m)

    st = list(repo.status(unknown=True))[:7]
    ms = merge_.mergestate(repo)
    st.append([f for f in ms if f == 'u'])
    labels = [_('%d modified'), _('%d added'), _('%d removed'),
              _('%d deleted'), _('%d unknown'), _('%d ignored'),
              _('%d unresolved')]
    t = []
    for s,l in zip(st, labels):
        if s:
            t.append(l % len(s))

    t = ', '.join(t)

    if len(parents) > 1:
        t += _(' (merge)')
    elif branch != parents[0].branch():
        t += _(' (new branch)')
    elif (not st[0] and not st[1] and not st[2]):
        t += _(' (clean)')
    elif pnode not in bheads:
        t += _(' (new branch head)')

    if 'clean' in t:
        ui.status(_('commit: %s\n') % t.strip())
    else:
        ui.write(_('commit: %s\n') % t.strip())

    # all ancestors of branch heads - all ancestors of parent = new csets
    new = [0] * len(repo)
    cl = repo.changelog
    for a in cl.ancestors(*[cl.rev(n) for n in bheads]):
        new[a] = 1
    for a in cl.ancestors(*[p.rev() for p in parents]):
        new[a] = 0
    new = sum(new)

    if new == 0:
        ui.status(_('update: (current)\n'))
    elif pnode not in bheads:
        ui.write(_('update: %d new changesets (update)\n') % new)
    else:
        ui.write(_('update: %d new changesets, %d branch heads (merge)\n') %
                 (new, len(bheads)))

    if opts.get('remote'):
        t = []
        source, revs, checkout = hg.parseurl(ui.expandpath('default'),
                                             opts.get('rev'))
        other = hg.repository(cmdutil.remoteui(repo, {}), source)
        ui.debug('comparing with %s\n' % url.hidepassword(source))
        repo.ui.pushbuffer()
        common, incoming, rheads = repo.findcommonincoming(other)
        repo.ui.popbuffer()
        if incoming:
            t.append(_('1 or more incoming'))

        dest, revs, checkout = hg.parseurl(
            ui.expandpath('default-push', 'default'))
        other = hg.repository(cmdutil.remoteui(repo, {}), dest)
        ui.debug('comparing with %s\n' % url.hidepassword(dest))
        repo.ui.pushbuffer()
        o = repo.findoutgoing(other)
        repo.ui.popbuffer()
        o = repo.changelog.nodesbetween(o, revs)[0]
        if o:
            t.append(_('%d outgoing') % len(o))

        if t:
            ui.write(_('remote: %s\n') % (', '.join(t)))
        else:
            ui.status(_('remote: (synced)\n'))

def tag(ui, repo, name1, *names, **opts):
    """add one or more tags for the current or given revision

    Name a particular revision using <name>.

    Tags are used to name particular revisions of the repository and are
    very useful to compare different revisions, to go back to significant
    earlier versions or to mark branch points as releases, etc.

    If no revision is given, the parent of the working directory is
    used, or tip if no revision is checked out.

    To facilitate version control, distribution, and merging of tags,
    they are stored as a file named ".hgtags" which is managed
    similarly to other project files and can be hand-edited if
    necessary. The file '.hg/localtags' is used for local tags (not
    shared among repositories).

    See 'hg help dates' for a list of formats valid for -d/--date.
    """

    rev_ = "."
    names = (name1,) + names
    if len(names) != len(set(names)):
        raise util.Abort(_('tag names must be unique'))
    for n in names:
        if n in ['tip', '.', 'null']:
            raise util.Abort(_('the name \'%s\' is reserved') % n)
    if opts.get('rev') and opts.get('remove'):
        raise util.Abort(_("--rev and --remove are incompatible"))
    if opts.get('rev'):
        rev_ = opts['rev']
    message = opts.get('message')
    if opts.get('remove'):
        expectedtype = opts.get('local') and 'local' or 'global'
        for n in names:
            if not repo.tagtype(n):
                raise util.Abort(_('tag \'%s\' does not exist') % n)
            if repo.tagtype(n) != expectedtype:
                if expectedtype == 'global':
                    raise util.Abort(_('tag \'%s\' is not a global tag') % n)
                else:
                    raise util.Abort(_('tag \'%s\' is not a local tag') % n)
        rev_ = nullid
        if not message:
            # we don't translate commit messages
            message = 'Removed tag %s' % ', '.join(names)
    elif not opts.get('force'):
        for n in names:
            if n in repo.tags():
                raise util.Abort(_('tag \'%s\' already exists '
                                   '(use -f to force)') % n)
    if not rev_ and repo.dirstate.parents()[1] != nullid:
        raise util.Abort(_('uncommitted merge - please provide a '
                           'specific revision'))
    r = repo[rev_].node()

    if not message:
        # we don't translate commit messages
        message = ('Added tag %s for changeset %s' %
                   (', '.join(names), short(r)))

    date = opts.get('date')
    if date:
        date = util.parsedate(date)

    repo.tag(names, r, message, opts.get('local'), opts.get('user'), date)

def tags(ui, repo):
    """list repository tags

    This lists both regular and local tags. When the -v/--verbose
    switch is used, a third column "local" is printed for local tags.
    """

    hexfunc = ui.debugflag and hex or short
    tagtype = ""

    for t, n in reversed(repo.tagslist()):
        if ui.quiet:
            ui.write("%s\n" % t)
            continue

        try:
            hn = hexfunc(n)
            r = "%5d:%s" % (repo.changelog.rev(n), hn)
        except error.LookupError:
            r = "    ?:%s" % hn
        else:
            spaces = " " * (30 - encoding.colwidth(t))
            if ui.verbose:
                if repo.tagtype(t) == 'local':
                    tagtype = " local"
                else:
                    tagtype = ""
            ui.write("%s%s %s%s\n" % (t, spaces, r, tagtype))

def tip(ui, repo, **opts):
    """show the tip revision

    The tip revision (usually just called the tip) is the changeset
    most recently added to the repository (and therefore the most
    recently changed head).

    If you have just made a commit, that commit will be the tip. If
    you have just pulled changes from another repository, the tip of
    that repository becomes the current tip. The "tip" tag is special
    and cannot be renamed or assigned to a different changeset.
    """
    cmdutil.show_changeset(ui, repo, opts).show(repo[len(repo) - 1])

def unbundle(ui, repo, fname1, *fnames, **opts):
    """apply one or more changegroup files

    Apply one or more compressed changegroup files generated by the
    bundle command.
    """
    fnames = (fname1,) + fnames

    lock = repo.lock()
    try:
        for fname in fnames:
            f = url.open(ui, fname)
            gen = changegroup.readbundle(f, fname)
            modheads = repo.addchangegroup(gen, 'unbundle', 'bundle:' + fname)
    finally:
        lock.release()

    return postincoming(ui, repo, modheads, opts.get('update'), None)

def update(ui, repo, node=None, rev=None, clean=False, date=None, check=False):
    """update working directory

    Update the repository's working directory to the specified
    changeset.

    If no changeset is specified, attempt to update to the head of the
    current branch. If this head is a descendant of the working
    directory's parent, update to it, otherwise abort.

    The following rules apply when the working directory contains
    uncommitted changes:

    1. If neither -c/--check nor -C/--clean is specified, and if
       the requested changeset is an ancestor or descendant of
       the working directory's parent, the uncommitted changes
       are merged into the requested changeset and the merged
       result is left uncommitted. If the requested changeset is
       not an ancestor or descendant (that is, it is on another
       branch), the update is aborted and the uncommitted changes
       are preserved.

    2. With the -c/--check option, the update is aborted and the
       uncommitted changes are preserved.

    3. With the -C/--clean option, uncommitted changes are discarded and
       the working directory is updated to the requested changeset.

    Use null as the changeset to remove the working directory (like 'hg
    clone -U').

    If you want to update just one file to an older changeset, use 'hg revert'.

    See 'hg help dates' for a list of formats valid for -d/--date.
    """
    if rev and node:
        raise util.Abort(_("please specify just one revision"))

    if not rev:
        rev = node

    if check and clean:
        raise util.Abort(_("cannot specify both -c/--check and -C/--clean"))

    if check:
        # we could use dirty() but we can ignore merge and branch trivia
        c = repo[None]
        if c.modified() or c.added() or c.removed():
            raise util.Abort(_("uncommitted local changes"))

    if date:
        if rev:
            raise util.Abort(_("you can't specify a revision and a date"))
        rev = cmdutil.finddate(ui, repo, date)

    if clean or check:
        return hg.clean(repo, rev)
    else:
        return hg.update(repo, rev)

def verify(ui, repo):
    """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.
    """
    return hg.verify(repo)

def version_(ui):
    """output version and copyright information"""
    ui.write(_("Mercurial Distributed SCM (version %s)\n")
             % util.version())
    ui.status(_(
        "\nCopyright (C) 2005-2010 Matt Mackall <[e-mail]> and others\n"
        "This is free software; see the source for copying conditions. "
        "There is NO\nwarranty; "
        "not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
    ))

# Command options and aliases are listed here, alphabetically

globalopts = [
    ('R', 'repository', '',
     _('repository root directory or name of overlay bundle file')),
    ('', 'cwd', '', _('change working directory')),
    ('y', 'noninteractive', None,
     _('do not prompt, assume \'yes\' for any required answers')),
    ('q', 'quiet', None, _('suppress output')),
    ('v', 'verbose', None, _('enable additional output')),
    ('', 'config', [], _('set/override config option')),
    ('', 'debug', None, _('enable debugging output')),
    ('', 'debugger', None, _('start debugger')),
    ('', 'encoding', encoding.encoding, _('set the charset encoding')),
    ('', 'encodingmode', encoding.encodingmode,
     _('set the charset encoding mode')),
    ('', 'traceback', None, _('always print a traceback on exception')),
    ('', 'time', None, _('time how long the command takes')),
    ('', 'profile', None, _('print command execution profile')),
    ('', 'version', None, _('output version information and exit')),
    ('h', 'help', None, _('display help and exit')),
]

dryrunopts = [('n', 'dry-run', None,
               _('do not perform actions, just print output'))]

remoteopts = [
    ('e', 'ssh', '', _('specify ssh command to use')),
    ('', 'remotecmd', '', _('specify hg command to run on the remote side')),
]

walkopts = [
    ('I', 'include', [], _('include names matching the given patterns')),
    ('X', 'exclude', [], _('exclude names matching the given patterns')),
]

commitopts = [
    ('m', 'message', '', _('use <text> as commit message')),
    ('l', 'logfile', '', _('read commit message from <file>')),
]

commitopts2 = [
    ('d', 'date', '', _('record datecode as commit date')),
    ('u', 'user', '', _('record the specified user as committer')),
]

templateopts = [
    ('', 'style', '', _('display using template map file')),
    ('', 'template', '', _('display with template')),
]

logopts = [
    ('p', 'patch', None, _('show patch')),
    ('g', 'git', None, _('use git extended diff format')),
    ('l', 'limit', '', _('limit number of changes displayed')),
    ('M', 'no-merges', None, _('do not show merges')),
] + templateopts

diffopts = [
    ('a', 'text', None, _('treat all files as text')),
    ('g', 'git', None, _('use git extended diff format')),
    ('', 'nodates', None, _("don't include dates in diff headers"))
]

diffopts2 = [
    ('p', 'show-function', None, _('show which function each change is in')),
    ('', 'reverse', None, _('produce a diff that undoes the changes')),
    ('w', 'ignore-all-space', None,
     _('ignore white space when comparing lines')),
    ('b', 'ignore-space-change', None,
     _('ignore changes in the amount of white space')),
    ('B', 'ignore-blank-lines', None,
     _('ignore changes whose lines are all blank')),
    ('U', 'unified', '', _('number of lines of context to show')),
    ('', 'stat', None, _('output diffstat-style summary of changes')),
]

similarityopts = [
    ('s', 'similarity', '',
           _('guess renamed files by similarity (0<=s<=100)'))
]

table = {
    "^add": (add, walkopts + dryrunopts, _('[OPTION]... [FILE]...')),
    "addremove":
        (addremove, similarityopts + walkopts + dryrunopts,
         _('[OPTION]... [FILE]...')),
    "^annotate|blame":
        (annotate,
         [('r', 'rev', '', _('annotate the specified revision')),
          ('f', 'follow', None, _('follow file copies and renames')),
          ('a', 'text', None, _('treat all files as text')),
          ('u', 'user', None, _('list the author (long with -v)')),
          ('d', 'date', None, _('list the date (short with -q)')),
          ('n', 'number', None, _('list the revision number (default)')),
          ('c', 'changeset', None, _('list the changeset')),
          ('l', 'line-number', None,
           _('show line number at the first appearance'))
         ] + walkopts,
         _('[-r REV] [-f] [-a] [-u] [-d] [-n] [-c] [-l] FILE...')),
    "archive":
        (archive,
         [('', 'no-decode', None, _('do not pass files through decoders')),
          ('p', 'prefix', '', _('directory prefix for files in archive')),
          ('r', 'rev', '', _('revision to distribute')),
          ('t', 'type', '', _('type of distribution to create')),
         ] + walkopts,
         _('[OPTION]... DEST')),
    "backout":
        (backout,
         [('', 'merge', None,
           _('merge with old dirstate parent after backout')),
          ('', 'parent', '', _('parent to choose when backing out merge')),
          ('r', 'rev', '', _('revision to backout')),
         ] + walkopts + commitopts + commitopts2,
         _('[OPTION]... [-r] REV')),
    "bisect":
        (bisect,
         [('r', 'reset', False, _('reset bisect state')),
          ('g', 'good', False, _('mark changeset good')),
          ('b', 'bad', False, _('mark changeset bad')),
          ('s', 'skip', False, _('skip testing changeset')),
          ('c', 'command', '', _('use command to check changeset state')),
          ('U', 'noupdate', False, _('do not update to target'))],
         _("[-gbsr] [-U] [-c CMD] [REV]")),
    "branch":
        (branch,
         [('f', 'force', None,
           _('set branch name even if it shadows an existing branch')),
          ('C', 'clean', None, _('reset branch name to parent branch name'))],
         _('[-fC] [NAME]')),
    "branches":
        (branches,
         [('a', 'active', False,
           _('show only branches that have unmerged heads')),
          ('c', 'closed', False,
           _('show normal and closed branches'))],
         _('[-ac]')),
    "bundle":
        (bundle,
         [('f', 'force', None,
           _('run even when remote repository is unrelated')),
          ('r', 'rev', [],
           _('a changeset up to which you would like to bundle')),
          ('', 'base', [],
           _('a base changeset to specify instead of a destination')),
          ('a', 'all', None, _('bundle all changesets in the repository')),
          ('t', 'type', 'bzip2', _('bundle compression type to use')),
         ] + remoteopts,
         _('[-f] [-t TYPE] [-a] [-r REV]... [--base REV]... FILE [DEST]')),
    "cat":
        (cat,
         [('o', 'output', '', _('print output to file with formatted name')),
          ('r', 'rev', '', _('print the given revision')),
          ('', 'decode', None, _('apply any matching decode filter')),
         ] + walkopts,
         _('[OPTION]... FILE...')),
    "^clone":
        (clone,
         [('U', 'noupdate', None,
          _('the clone will only contain a repository (no working copy)')),
          ('u', 'updaterev', '',
           _('revision, tag or branch to check out')),
          ('r', 'rev', [],
           _('clone only the specified revisions and ancestors')),
          ('', 'pull', None, _('use pull protocol to copy metadata')),
          ('', 'uncompressed', None,
           _('use uncompressed transfer (fast over LAN)')),
         ] + remoteopts,
         _('[OPTION]... SOURCE [DEST]')),
    "^commit|ci":
        (commit,
         [('A', 'addremove', None,
           _('mark new/missing files as added/removed before committing')),
          ('', 'close-branch', None,
           _('mark a branch as closed, hiding it from the branch list')),
         ] + walkopts + commitopts + commitopts2,
         _('[OPTION]... [FILE]...')),
    "copy|cp":
        (copy,
         [('A', 'after', None, _('record a copy that has already occurred')),
          ('f', 'force', None,
           _('forcibly copy over an existing managed file')),
         ] + walkopts + dryrunopts,
         _('[OPTION]... [SOURCE]... DEST')),
    "debugancestor": (debugancestor, [], _('[INDEX] REV1 REV2')),
    "debugcheckstate": (debugcheckstate, [], ''),
    "debugcommands": (debugcommands, [], _('[COMMAND]')),
    "debugcomplete":
        (debugcomplete,
         [('o', 'options', None, _('show the command options'))],
         _('[-o] CMD')),
    "debugdate":
        (debugdate,
         [('e', 'extended', None, _('try extended date formats'))],
         _('[-e] DATE [RANGE]')),
    "debugdata": (debugdata, [], _('FILE REV')),
    "debugfsinfo": (debugfsinfo, [], _('[PATH]')),
    "debugindex": (debugindex, [], _('FILE')),
    "debugindexdot": (debugindexdot, [], _('FILE')),
    "debuginstall": (debuginstall, [], ''),
    "debugrebuildstate":
        (debugrebuildstate,
         [('r', 'rev', '', _('revision to rebuild to'))],
         _('[-r REV] [REV]')),
    "debugrename":
        (debugrename,
         [('r', 'rev', '', _('revision to debug'))],
         _('[-r REV] FILE')),
    "debugsetparents":
        (debugsetparents, [], _('REV1 [REV2]')),
    "debugstate":
        (debugstate,
         [('', 'nodates', None, _('do not display the saved mtime'))],
         _('[OPTION]...')),
    "debugsub":
        (debugsub,
         [('r', 'rev', '', _('revision to check'))],
         _('[-r REV] [REV]')),
    "debugwalk": (debugwalk, walkopts, _('[OPTION]... [FILE]...')),
    "^diff":
        (diff,
         [('r', 'rev', [], _('revision')),
          ('c', 'change', '', _('change made by revision'))
         ] + diffopts + diffopts2 + walkopts,
         _('[OPTION]... [-r REV1 [-r REV2]] [FILE]...')),
    "^export":
        (export,
         [('o', 'output', '', _('print output to file with formatted name')),
          ('', 'switch-parent', None, _('diff against the second parent'))
          ] + diffopts,
         _('[OPTION]... [-o OUTFILESPEC] REV...')),
    "^forget":
        (forget,
         [] + walkopts,
         _('[OPTION]... FILE...')),
    "grep":
        (grep,
         [('0', 'print0', None, _('end fields with NUL')),
          ('', 'all', None, _('print all revisions that match')),
          ('f', 'follow', None,
           _('follow changeset history, or file history across copies and renames')),
          ('i', 'ignore-case', None, _('ignore case when matching')),
          ('l', 'files-with-matches', None,
           _('print only filenames and revisions that match')),
          ('n', 'line-number', None, _('print matching line numbers')),
          ('r', 'rev', [], _('search in given revision range')),
          ('u', 'user', None, _('list the author (long with -v)')),
          ('d', 'date', None, _('list the date (short with -q)')),
         ] + walkopts,
         _('[OPTION]... PATTERN [FILE]...')),
    "heads":
        (heads,
         [('r', 'rev', '', _('show only heads which are descendants of REV')),
          ('a', 'active', False,
           _('show only the active branch heads from open branches')),
          ('c', 'closed', False,
           _('show normal and closed branch heads')),
         ] + templateopts,
         _('[-ac] [-r STARTREV] [REV]...')),
    "help": (help_, [], _('[TOPIC]')),
    "identify|id":
        (identify,
         [('r', 'rev', '', _('identify the specified revision')),
          ('n', 'num', None, _('show local revision number')),
          ('i', 'id', None, _('show global revision id')),
          ('b', 'branch', None, _('show branch')),
          ('t', 'tags', None, _('show tags'))],
         _('[-nibt] [-r REV] [SOURCE]')),
    "import|patch":
        (import_,
         [('p', 'strip', 1,
           _('directory strip option for patch. This has the same '
             'meaning as the corresponding patch option')),
          ('b', 'base', '', _('base path')),
          ('f', 'force', None,
           _('skip check for outstanding uncommitted changes')),
          ('', 'no-commit', None, _("don't commit, just update the working directory")),
          ('', 'exact', None,
           _('apply patch to the nodes from which it was generated')),
          ('', 'import-branch', None,
           _('use any branch information in patch (implied by --exact)'))] +
         commitopts + commitopts2 + similarityopts,
         _('[OPTION]... PATCH...')),
    "incoming|in":
        (incoming,
         [('f', 'force', None,
           _('run even when remote repository is unrelated')),
          ('n', 'newest-first', None, _('show newest record first')),
          ('', 'bundle', '', _('file to store the bundles into')),
          ('r', 'rev', [],
           _('a specific remote revision up to which you would like to pull')),
         ] + logopts + remoteopts,
         _('[-p] [-n] [-M] [-f] [-r REV]...'
           ' [--bundle FILENAME] [SOURCE]')),
    "^init":
        (init,
         remoteopts,
         _('[-e CMD] [--remotecmd CMD] [DEST]')),
    "locate":
        (locate,
         [('r', 'rev', '', _('search the repository as it stood at REV')),
          ('0', 'print0', None,
           _('end filenames with NUL, for use with xargs')),
          ('f', 'fullpath', None,
           _('print complete paths from the filesystem root')),
         ] + walkopts,
         _('[OPTION]... [PATTERN]...')),
    "^log|history":
        (log,
         [('f', 'follow', None,
           _('follow changeset history, or file history across copies and renames')),
          ('', 'follow-first', None,
           _('only follow the first parent of merge changesets')),
          ('d', 'date', '', _('show revisions matching date spec')),
          ('C', 'copies', None, _('show copied files')),
          ('k', 'keyword', [], _('do case-insensitive search for a keyword')),
          ('r', 'rev', [], _('show the specified revision or range')),
          ('', 'removed', None, _('include revisions where files were removed')),
          ('m', 'only-merges', None, _('show only merges')),
          ('u', 'user', [], _('revisions committed by user')),
          ('b', 'only-branch', [],
            _('show only changesets within the given named branch')),
          ('P', 'prune', [], _('do not display revision or any of its ancestors')),
         ] + logopts + walkopts,
         _('[OPTION]... [FILE]')),
    "manifest":
        (manifest,
         [('r', 'rev', '', _('revision to display'))],
         _('[-r REV]')),
    "^merge":
        (merge,
         [('f', 'force', None, _('force a merge with outstanding changes')),
          ('r', 'rev', '', _('revision to merge')),
          ('P', 'preview', None,
           _('review revisions to merge (no merge is performed)'))],
         _('[-P] [-f] [[-r] REV]')),
    "outgoing|out":
        (outgoing,
         [('f', 'force', None,
           _('run even when remote repository is unrelated')),
          ('r', 'rev', [],
           _('a specific revision up to which you would like to push')),
          ('n', 'newest-first', None, _('show newest record first')),
         ] + logopts + remoteopts,
         _('[-M] [-p] [-n] [-f] [-r REV]... [DEST]')),
    "parents":
        (parents,
         [('r', 'rev', '', _('show parents from the specified revision')),
         ] + templateopts,
         _('[-r REV] [FILE]')),
    "paths": (paths, [], _('[NAME]')),
    "^pull":
        (pull,
         [('u', 'update', None,
           _('update to new branch head if changesets were pulled')),
          ('f', 'force', None,
           _('run even when remote repository is unrelated')),
          ('r', 'rev', [],
           _('a specific remote revision up to which you would like to pull')),
         ] + remoteopts,
         _('[-u] [-f] [-r REV]... [-e CMD] [--remotecmd CMD] [SOURCE]')),
    "^push":
        (push,
         [('f', 'force', None, _('force push')),
          ('r', 'rev', [],
           _('a specific revision up to which you would like to push')),
         ] + remoteopts,
         _('[-f] [-r REV]... [-e CMD] [--remotecmd CMD] [DEST]')),
    "recover": (recover, []),
    "^remove|rm":
        (remove,
         [('A', 'after', None, _('record delete for missing files')),
          ('f', 'force', None,
           _('remove (and delete) file even if added or modified')),
         ] + walkopts,
         _('[OPTION]... FILE...')),
    "rename|mv":
        (rename,
         [('A', 'after', None, _('record a rename that has already occurred')),
          ('f', 'force', None,
           _('forcibly copy over an existing managed file')),
         ] + walkopts + dryrunopts,
         _('[OPTION]... SOURCE... DEST')),
    "resolve":
        (resolve,
         [('a', 'all', None, _('select all unresolved files')),
          ('l', 'list', None, _('list state of files needing merge')),
          ('m', 'mark', None, _('mark files as resolved')),
          ('u', 'unmark', None, _('unmark files as resolved')),
          ('n', 'no-status', None, _('hide status prefix'))]
          + walkopts,
          _('[OPTION]... [FILE]...')),
    "revert":
        (revert,
         [('a', 'all', None, _('revert all changes when no arguments given')),
          ('d', 'date', '', _('tipmost revision matching date')),
          ('r', 'rev', '', _('revision to revert to')),
          ('', 'no-backup', None, _('do not save backup copies of files')),
         ] + walkopts + dryrunopts,
         _('[OPTION]... [-r REV] [NAME]...')),
    "rollback": (rollback, []),
    "root": (root, []),
    "^serve":
        (serve,
         [('A', 'accesslog', '', _('name of access log file to write to')),
          ('d', 'daemon', None, _('run server in background')),
          ('', 'daemon-pipefds', '', _('used internally by daemon mode')),
          ('E', 'errorlog', '', _('name of error log file to write to')),
          ('p', 'port', 0, _('port to listen on (default: 8000)')),
          ('a', 'address', '', _('address to listen on (default: all interfaces)')),
          ('', 'prefix', '', _('prefix path to serve from (default: server root)')),
          ('n', 'name', '',
           _('name to show in web pages (default: working directory)')),
          ('', 'webdir-conf', '', _('name of the webdir config file'
                                    ' (serve more than one repository)')),
          ('', 'pid-file', '', _('name of file to write process ID to')),
          ('', 'stdio', None, _('for remote clients')),
          ('t', 'templates', '', _('web templates to use')),
          ('', 'style', '', _('template style to use')),
          ('6', 'ipv6', None, _('use IPv6 in addition to IPv4')),
          ('', 'certificate', '', _('SSL certificate file'))],
         _('[OPTION]...')),
    "showconfig|debugconfig":
        (showconfig,
         [('u', 'untrusted', None, _('show untrusted configuration options'))],
         _('[-u] [NAME]...')),
    "^summary|sum":
        (summary,
         [('', 'remote', None, _('check for push and pull'))], '[--remote]'),
    "^status|st":
        (status,
         [('A', 'all', None, _('show status of all files')),
          ('m', 'modified', None, _('show only modified files')),
          ('a', 'added', None, _('show only added files')),
          ('r', 'removed', None, _('show only removed files')),
          ('d', 'deleted', None, _('show only deleted (but tracked) files')),
          ('c', 'clean', None, _('show only files without changes')),
          ('u', 'unknown', None, _('show only unknown (not tracked) files')),
          ('i', 'ignored', None, _('show only ignored files')),
          ('n', 'no-status', None, _('hide status prefix')),
          ('C', 'copies', None, _('show source of copied files')),
          ('0', 'print0', None,
           _('end filenames with NUL, for use with xargs')),
          ('', 'rev', [], _('show difference from revision')),
         ] + walkopts,
         _('[OPTION]... [FILE]...')),
    "tag":
        (tag,
         [('f', 'force', None, _('replace existing tag')),
          ('l', 'local', None, _('make the tag local')),
          ('r', 'rev', '', _('revision to tag')),
          ('', 'remove', None, _('remove a tag')),
          # -l/--local is already there, commitopts cannot be used
          ('m', 'message', '', _('use <text> as commit message')),
         ] + commitopts2,
         _('[-f] [-l] [-m TEXT] [-d DATE] [-u USER] [-r REV] NAME...')),
    "tags": (tags, [], ''),
    "tip":
        (tip,
         [('p', 'patch', None, _('show patch')),
          ('g', 'git', None, _('use git extended diff format')),
         ] + templateopts,
         _('[-p] [-g]')),
    "unbundle":
        (unbundle,
         [('u', 'update', None,
           _('update to new branch head if changesets were unbundled'))],
         _('[-u] FILE...')),
    "^update|up|checkout|co":
        (update,
         [('C', 'clean', None, _('discard uncommitted changes (no backup)')),
          ('c', 'check', None, _('check for uncommitted changes')),
          ('d', 'date', '', _('tipmost revision matching date')),
          ('r', 'rev', '', _('revision'))],
         _('[-c] [-C] [-d DATE] [[-r] REV]')),
    "verify": (verify, []),
    "version": (version_, []),
}

norepo = ("clone init version help debugcommands debugcomplete debugdata"
          " debugindex debugindexdot debugdate debuginstall debugfsinfo")
optionalrepo = ("identify paths serve showconfig debugancestor")