annotate mercurial/commands.py @ 3403:372999405787

Back out d8eba1c3ce9b and a004164dbeef

# commands.py - command processing for mercurial
#
# Copyright 2005, 2006 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

from demandload import demandload
from node import *
from i18n import gettext as _
demandload(globals(), "os re sys signal shutil imp urllib pdb shlex")
demandload(globals(), "fancyopts ui hg util lock revlog templater bundlerepo")
demandload(globals(), "fnmatch difflib patch random signal tempfile time")
demandload(globals(), "traceback errno socket version struct atexit sets bz2")
demandload(globals(), "archival cStringIO changegroup")
demandload(globals(), "cmdutil hgweb.server sshserver")

class UnknownCommand(Exception):
    """Exception raised if command is not in the command table."""
class AmbiguousCommand(Exception):
    """Exception raised if command shortcut matches more than one command."""

def bail_if_changed(repo):
    modified, added, removed, deleted = repo.status()[:4]
    if modified or added or removed or deleted:
        raise util.Abort(_("outstanding uncommitted changes"))

def relpath(repo, args):
    cwd = repo.getcwd()
    if cwd:
        return [util.normpath(os.path.join(cwd, x)) for x in args]
    return args

def logmessage(opts):
    """ get the log message according to -m and -l option """
    message = opts['message']
    logfile = opts['logfile']

    if message and logfile:
        raise util.Abort(_('options --message and --logfile are mutually '
                           'exclusive'))
    if not message and logfile:
        try:
            if logfile == '-':
                message = sys.stdin.read()
            else:
                message = open(logfile).read()
        except IOError, inst:
            raise util.Abort(_("can't read commit message '%s': %s") %
                             (logfile, inst.strerror))
    return message

def walkchangerevs(ui, repo, pats, opts):
    '''Iterate over files and the revs they changed in.

    Callers most commonly need to iterate backwards over the history
    it is interested in.  Doing so has awful (quadratic-looking)
    performance, so we use iterators in a "windowed" way.

    We walk a window of revisions in the desired order.  Within the
    window, we first walk forwards to gather data, then in the desired
    order (usually backwards) to display it.

    This function returns an (iterator, getchange, matchfn) tuple.  The
    getchange function returns the changelog entry for a numeric
    revision.  The iterator yields 3-tuples.  They will be of one of
    the following forms:

    "window", incrementing, lastrev: stepping through a window,
    positive if walking forwards through revs, last rev in the
    sequence iterated over - use to reset state for the current window

    "add", rev, fns: out-of-order traversal of the given file names
    fns, which changed during revision rev - use to gather data for
    possible display

    "iter", rev, None: in-order traversal of the revs earlier iterated
    over with "add" - use to display data'''

    def increasing_windows(start, end, windowsize=8, sizelimit=512):
        if start < end:
            while start < end:
                yield start, min(windowsize, end-start)
                start += windowsize
                if windowsize < sizelimit:
                    windowsize *= 2
        else:
            while start > end:
                yield start, min(windowsize, start-end-1)
                start -= windowsize
                if windowsize < sizelimit:
                    windowsize *= 2


    files, matchfn, anypats = cmdutil.matchpats(repo, pats, opts)
    follow = opts.get('follow') or opts.get('follow_first')

    if repo.changelog.count() == 0:
        return [], False, matchfn

    if follow:
        defrange = '%s:0' % repo.changectx().rev()
    else:
        defrange = 'tip:0'
    revs = map(int, cmdutil.revrange(ui, repo, opts['rev'] or [defrange]))
    wanted = {}
    slowpath = anypats
    fncache = {}

    chcache = {}
    def getchange(rev):
        ch = chcache.get(rev)
        if ch is None:
            chcache[rev] = ch = repo.changelog.read(repo.lookup(str(rev)))
        return ch

    if not slowpath and not files:
        # No files, no patterns.  Display all revs.
        wanted = dict(zip(revs, revs))
    copies = []
    if not slowpath:
        # Only files, no patterns.  Check the history of each file.
        def filerevgen(filelog, node):
            cl_count = repo.changelog.count()
            if node is None:
                last = filelog.count() - 1
            else:
                last = filelog.rev(node)
            for i, window in increasing_windows(last, -1):
                revs = []
                for j in xrange(i - window, i + 1):
                    n = filelog.node(j)
                    revs.append((filelog.linkrev(n),
                                 follow and filelog.renamed(n)))
                revs.reverse()
                for rev in revs:
                    # only yield rev for which we have the changelog, it can
                    # happen while doing "hg log" during a pull or commit
                    if rev[0] < cl_count:
                        yield rev
        def iterfiles():
            for filename in files:
                yield filename, None
            for filename_node in copies:
                yield filename_node
        minrev, maxrev = min(revs), max(revs)
        for file_, node in iterfiles():
            filelog = repo.file(file_)
            # A zero count may be a directory or deleted file, so
            # try to find matching entries on the slow path.
            if filelog.count() == 0:
                slowpath = True
                break
            for rev, copied in filerevgen(filelog, node):
                if rev <= maxrev:
                    if rev < minrev:
                        break
                    fncache.setdefault(rev, [])
                    fncache[rev].append(file_)
                    wanted[rev] = 1
                    if follow and copied:
                        copies.append(copied)
    if slowpath:
        if follow:
            raise util.Abort(_('can only follow copies/renames for explicit '
                               'file names'))

        # The slow path checks files modified in every changeset.
        def changerevgen():
            for i, window in increasing_windows(repo.changelog.count()-1, -1):
                for j in xrange(i - window, i + 1):
                    yield j, getchange(j)[3]

        for rev, changefiles in changerevgen():
            matches = filter(matchfn, changefiles)
            if matches:
                fncache[rev] = matches
                wanted[rev] = 1

    class followfilter:
        def __init__(self, onlyfirst=False):
            self.startrev = -1
            self.roots = []
            self.onlyfirst = onlyfirst

        def match(self, rev):
            def realparents(rev):
                if self.onlyfirst:
                    return repo.changelog.parentrevs(rev)[0:1]
                else:
                    return filter(lambda x: x != -1, repo.changelog.parentrevs(rev))

            if self.startrev == -1:
                self.startrev = rev
                return True

            if rev > self.startrev:
                # forward: all descendants
                if not self.roots:
                    self.roots.append(self.startrev)
                for parent in realparents(rev):
                    if parent in self.roots:
                        self.roots.append(rev)
                        return True
            else:
                # backwards: all parents
                if not self.roots:
                    self.roots.extend(realparents(self.startrev))
                if rev in self.roots:
                    self.roots.remove(rev)
                    self.roots.extend(realparents(rev))
                    return True

            return False

    # it might be worthwhile to do this in the iterator if the rev range
    # is descending and the prune args are all within that range
    for rev in opts.get('prune', ()):
        rev = repo.changelog.rev(repo.lookup(rev))
        ff = followfilter()
        stop = min(revs[0], revs[-1])
        for x in range(rev, stop-1, -1):
            if ff.match(x) and wanted.has_key(x):
                del wanted[x]

    def iterate():
        if follow and not files:
            ff = followfilter(onlyfirst=opts.get('follow_first'))
            def want(rev):
                if ff.match(rev) and rev in wanted:
                    return True
                return False
        else:
            def want(rev):
                return rev in wanted

        for i, window in increasing_windows(0, len(revs)):
            yield 'window', revs[0] < revs[-1], revs[-1]
            nrevs = [rev for rev in revs[i:i+window] if want(rev)]
            srevs = list(nrevs)
            srevs.sort()
            for rev in srevs:
                fns = fncache.get(rev) or filter(matchfn, getchange(rev)[3])
                yield 'add', rev, fns
            for rev in nrevs:
                yield 'iter', rev, None
    return iterate(), getchange, matchfn

def write_bundle(cg, filename=None, compress=True):
    """Write a bundle file and return its filename.

    Existing files will not be overwritten.
    If no filename is specified, a temporary file is created.
    bz2 compression can be turned off.
    The bundle file will be deleted in case of errors.
    """
    class nocompress(object):
        def compress(self, x):
            return x
        def flush(self):
            return ""

    fh = None
    cleanup = None
    try:
        if filename:
            if os.path.exists(filename):
                raise util.Abort(_("file '%s' already exists") % filename)
            fh = open(filename, "wb")
        else:
            fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg")
            fh = os.fdopen(fd, "wb")
        cleanup = filename

        if compress:
            fh.write("HG10")
            z = bz2.BZ2Compressor(9)
        else:
            fh.write("HG10UN")
            z = nocompress()
        # parse the changegroup data, otherwise we will block
        # in case of sshrepo because we don't know the end of the stream

        # an empty chunkiter is the end of the changegroup
        empty = False
        while not empty:
            empty = True
            for chunk in changegroup.chunkiter(cg):
                empty = False
                fh.write(z.compress(changegroup.genchunk(chunk)))
            fh.write(z.compress(changegroup.closechunk()))
        fh.write(z.flush())
        cleanup = None
        return filename
    finally:
        if fh is not None:
            fh.close()
        if cleanup is not None:
            os.unlink(cleanup)

def trimuser(ui, name, rev, revcache):
    """trim the name of the user who committed a change"""
    user = revcache.get(rev)
    if user is None:
        user = revcache[rev] = ui.shortuser(name)
    return user

class changeset_printer(object):
    '''show changeset information when templating not requested.'''

    def __init__(self, ui, repo):
        self.ui = ui
        self.repo = repo

    def show(self, rev=0, changenode=None, brinfo=None, copies=None):
        '''show a single changeset or file revision'''
        log = self.repo.changelog
        if changenode is None:
            changenode = log.node(rev)
        elif not rev:
            rev = log.rev(changenode)

        if self.ui.quiet:
            self.ui.write("%d:%s\n" % (rev, short(changenode)))
            return

        changes = log.read(changenode)
        date = util.datestr(changes[2])

        hexfunc = self.ui.debugflag and hex or short

        parents = [(log.rev(p), hexfunc(p)) for p in log.parents(changenode)
                   if self.ui.debugflag or p != nullid]
        if (not self.ui.debugflag and len(parents) == 1 and
            parents[0][0] == rev-1):
            parents = []

        self.ui.write(_("changeset:   %d:%s\n") % (rev, hexfunc(changenode)))

        for tag in self.repo.nodetags(changenode):
            self.ui.status(_("tag:         %s\n") % tag)
        for parent in parents:
            self.ui.write(_("parent:      %d:%s\n") % parent)

        if brinfo and changenode in brinfo:
            br = brinfo[changenode]
            self.ui.write(_("branch:      %s\n") % " ".join(br))

        self.ui.debug(_("manifest:    %d:%s\n") %
                      (self.repo.manifest.rev(changes[0]), hex(changes[0])))
        self.ui.status(_("user:        %s\n") % changes[1])
        self.ui.status(_("date:        %s\n") % date)

        if self.ui.debugflag:
            files = self.repo.status(log.parents(changenode)[0], changenode)[:3]
            for key, value in zip([_("files:"), _("files+:"), _("files-:")],
                                  files):
                if value:
                    self.ui.note("%-12s %s\n" % (key, " ".join(value)))
        else:
            self.ui.note(_("files:       %s\n") % " ".join(changes[3]))
        if copies:
            copies = ['%s (%s)' % c for c in copies]
            self.ui.note(_("copies:      %s\n") % ' '.join(copies))

        description = changes[4].strip()
        if description:
            if self.ui.verbose:
                self.ui.status(_("description:\n"))
                self.ui.status(description)
                self.ui.status("\n\n")
            else:
                self.ui.status(_("summary:     %s\n") %
                               description.splitlines()[0])
        self.ui.status("\n")

def show_changeset(ui, repo, opts):
    """show one changeset using template or regular display.

    Display format will be the first non-empty hit of:
    1. option 'template'
    2. option 'style'
    3. [ui] setting 'logtemplate'
    4. [ui] setting 'style'
    If all of these values are either the unset or the empty string,
    regular display via changeset_printer() is done.
    """
    # options
    tmpl = opts.get('template')
    mapfile = None
    if tmpl:
        tmpl = templater.parsestring(tmpl, quoted=False)
    else:
        mapfile = opts.get('style')
        # ui settings
        if not mapfile:
            tmpl = ui.config('ui', 'logtemplate')
            if tmpl:
                tmpl = templater.parsestring(tmpl)
            else:
                mapfile = ui.config('ui', 'style')

    if tmpl or mapfile:
        if mapfile:
            if not os.path.split(mapfile)[0]:
                mapname = (templater.templatepath('map-cmdline.' + mapfile)
                           or templater.templatepath(mapfile))
                if mapname: mapfile = mapname
        try:
            t = templater.changeset_templater(ui, repo, mapfile)
        except SyntaxError, inst:
            raise util.Abort(inst.args[0])
        if tmpl: t.use_template(tmpl)
        return t
    return changeset_printer(ui, repo)

def setremoteconfig(ui, opts):
    "copy remote options to ui tree"
    if opts.get('ssh'):
        ui.setconfig("ui", "ssh", opts['ssh'])
    if opts.get('remotecmd'):
        ui.setconfig("ui", "remotecmd", opts['remotecmd'])

def show_version(ui):
    """output version and copyright information"""
    ui.write(_("Mercurial Distributed SCM (version %s)\n")
             % version.get_version())
    ui.status(_(
        "\nCopyright (C) 2005, 2006 Matt Mackall <[e-mail]>\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"
    ))

def help_(ui, name=None, with_version=False):
    """show help for a command, extension, or list of commands

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

    Given a command name, print help for that command.

    Given an extension name, print help for that extension, and the
    commands it provides."""
    option_lists = []

    def helpcmd(name):
        if with_version:
            show_version(ui)
            ui.write('\n')
        aliases, i = findcmd(ui, name)
        # synopsis
        ui.write("%s\n\n" % i[2])

        # description
        doc = i[0].__doc__
        if not doc:
            doc = _("(No help text available)")
        if ui.quiet:
            doc = doc.splitlines(0)[0]
        ui.write("%s\n" % doc.rstrip())

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

            # options
            if i[1]:
                option_lists.append(("options", i[1]))

    def helplist(select=None):
        h = {}
        cmds = {}
        for c, e in table.items():
            f = c.split("|", 1)[0]
            if select and not select(f):
                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 not doc:
                doc = _("(No help text available)")
            h[f] = doc.splitlines(0)[0].rstrip()
            cmds[f] = c.lstrip("^")

        fns = h.keys()
        fns.sort()
        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, h[f]))

    def helpext(name):
        try:
            mod = findext(name)
        except KeyError:
            raise UnknownCommand(name)

        doc = (mod.__doc__ or _('No help text available')).splitlines(0)
        ui.write(_('%s extension - %s\n') % (name.split('.')[-1], doc[0]))
        for d in doc[1:]:
            ui.write(d, '\n')

        ui.status('\n')
        if ui.verbose:
            ui.status(_('list of commands:\n\n'))
        else:
            ui.status(_('list of commands (use "hg help -v %s" '
                        'to show aliases and global options):\n\n') % name)

        modcmds = dict.fromkeys([c.split('|', 1)[0] for c in mod.cmdtable])
        helplist(modcmds.has_key)

    if name and name != 'shortlist':
        try:
            helpcmd(name)
        except UnknownCommand:
            helpext(name)

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

        # list of commands
        if name == "shortlist":
            ui.status(_('basic commands (use "hg help" '
                        'for the full list or option "-v" for details):\n\n'))
        elif ui.verbose:
            ui.status(_('list of commands:\n\n'))
        else:
            ui.status(_('list of commands (use "hg help -v" '
                        'to show aliases and global options):\n\n'))

        helplist()

    # global options
    if ui.verbose:
        option_lists.append(("global options", globalopts))

    # list all option lists
    opt_output = []
    for title, options in option_lists:
        opt_output.append(("\n%s:\n" % title, None))
        for shortopt, longopt, default, desc in options:
            opt_output.append(("%2s%s" % (shortopt and "-%s" % shortopt,
                                          longopt and " --%s" % longopt),
                               "%s%s" % (desc,
                                         default
                                         and _(" (default: %s)") % default
                                         or "")))

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

# 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.

    If no names are given, add all files in the repository.
    """

    names = []
    for src, abs, rel, exact in cmdutil.walk(repo, pats, opts):
        if exact:
            if ui.verbose:
                ui.status(_('adding %s\n') % rel)
            names.append(abs)
        elif repo.dirstate.state(abs) == '?':
            ui.status(_('adding %s\n') % rel)
            names.append(abs)
    if not opts.get('dry_run'):
        repo.add(names)

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 option to detect renamed files.  With a parameter > 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.
    """
    sim = float(opts.get('similarity') or 0)
    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 per file line

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

    This command is useful to discover who did a change or when a change took
    place.

    Without the -a option, annotate will avoid processing files it
    detects as binary. With -a, annotate will generate an annotation
    anyway, probably with undesirable results.
    """
    getdate = util.cachefunc(lambda x: util.datestr(x.date()))

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

    opmap = [['user', lambda x: ui.shortuser(x.user())],
             ['number', lambda x: str(x.rev())],
             ['changeset', lambda x: short(x.node())],
             ['date', getdate], ['follow', lambda x: x.path()]]
    if (not opts['user'] and not opts['changeset'] and not opts['date']
        and not opts['follow']):
        opts['number'] = 1

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

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

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

        for o, f in opmap:
            if opts[o]:
                l = [f(n) for n, dummy in lines]
                if l:
                    m = max(map(len, l))
                    pieces.append(["%*s" % (m, 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 unversioned archive of a repository revision

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

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

    "files" (default): a directory full of files
    "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" to specify a format string for the prefix.
    The default is the basename of the archive, with suffixes removed.
    '''

    node = repo.changectx(opts['rev']).node()
    dest = cmdutil.make_filename(repo, dest, node)
    if os.path.realpath(dest) == repo.root:
        raise util.Abort(_('repository root cannot be destination'))
    dummy, matchfn, dummy = cmdutil.matchpats(repo, [], opts)
    kind = opts.get('type') or 'files'
    prefix = opts['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['no_decode'],
                     matchfn, prefix)

def backout(ui, repo, rev, **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 back out a changeset other than the tip, a new head is
    created.  This head is the parent of the working directory.  If
    you back out an old changeset, your working directory will appear
    old after the backout.  You should merge the 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 for a normal
    merge.'''

    bail_if_changed(repo)
    op1, op2 = repo.dirstate.parents()
    if op2 != nullid:
        raise util.Abort(_('outstanding uncommitted merge'))
    node = repo.lookup(rev)
    p1, p2 = repo.changelog.parents(node)
    if p1 == nullid:
        raise util.Abort(_('cannot back out a change with no parents'))
    if p2 != nullid:
        if not opts['parent']:
            raise util.Abort(_('cannot back out 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['parent']:
            raise util.Abort(_('cannot use --parent on non-merge changeset'))
        parent = p1
    hg.clean(repo, node, show_stats=False)
    revert_opts = opts.copy()
    revert_opts['all'] = True
    revert_opts['rev'] = hex(parent)
    revert(ui, repo, **revert_opts)
    commit_opts = opts.copy()
    commit_opts['addremove'] = False
    if not commit_opts['message'] and not commit_opts['logfile']:
        commit_opts['message'] = _("Backed out changeset %s") % (hex(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:
        if opts['merge']:
            ui.status(_('merging with changeset %s\n') % nice(op1))
            n = _lookup(repo, hex(op1))
            hg.merge(repo, n)
        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 bundle(ui, repo, fname, dest=None, **opts):
    """create a changegroup file

    Generate a compressed changegroup file collecting changesets.
    not found in the other repository.

    If no destination repository is specified the destination is
    assumed to have all the node specified by --base.

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

    Unlike import/export, this exactly preserves all changeset
    contents including permissions, rename data, and revision history.
    """
    revs = opts.get('rev') or None
    if revs:
        revs = [repo.lookup(rev) for rev in revs]
    base = opts.get('base')
    if base:
        if dest:
            raise util.Abort(_("--base is incompatible with specifiying "
                               "a destination"))
        base = [repo.lookup(rev) for rev in base]
        # create the right base
        # XXX: nodesbetween / changegroup* should be "fixed" instead
        o = []
        has_set = sets.Set(base)
        for n in base:
            has_set.update(repo.changelog.reachable(n))
        if revs:
            visit = list(revs)
        else:
            visit = repo.changelog.heads()
        while visit:
            n = visit.pop(0)
            parents = [p for p in repo.changelog.parents(n)
                       if p != nullid and p not in has_set]
            if len(parents) == 0:
                o.insert(0, n)
            else:
                visit.extend(parents)
    else:
        setremoteconfig(ui, opts)
        dest = ui.expandpath(dest or 'default-push', dest or 'default')
        other = hg.repository(ui, dest)
        o = repo.findoutgoing(other, force=opts['force'])

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

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

    Print the specified files as they were at the given revision.
    If no revision is given then working dir parent 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 repo root
    %p   root-relative path name of file being printed
    """
    ctx = repo.changectx(opts['rev'])
    for src, abs, rel, exact in cmdutil.walk(repo, (file1,) + pats, opts,
                                             ctx.node()):
        fp = cmdutil.make_file(repo, opts['output'], ctx.node(), pathname=abs)
        fp.write(ctx.filectx(abs).data())

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.

    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.

    You can safely clone repositories and checked out files using full
    hardlinks with

      $ cp -al REPO REPOCLONE

    which is the fastest way to clone. However, 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).

    If you use the -r option to clone up to a specific revision, no
    subsequent revisions will be present in the cloned repository.
    This option implies --pull, even on local repositories.

    See pull for valid source format details.

    It is possible to specify an ssh:// URL as the destination, but no
    .hg/hgrc will be created on the remote side. Look at the help text
    for the pull command for important details about ssh:// URLs.
    """
    setremoteconfig(ui, opts)
    hg.clone(ui, ui.expandpath(source), dest,
             pull=opts['pull'],
             stream=opts['uncompressed'],
             rev=opts['rev'],
             update=not opts['noupdate'])

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

    Commit changes to the given files into the repository.

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

    If no commit message is specified, the editor configured in your hgrc
    or in the EDITOR environment variable is started to enter a message.
    """
    message = logmessage(opts)

    if opts['addremove']:
        cmdutil.addremove(repo, pats, opts)
    fns, match, anypats = cmdutil.matchpats(repo, pats, opts)
    if pats:
        modified, added, removed = repo.status(files=fns, match=match)[:3]
        files = modified + added + removed
    else:
        files = []
    try:
        repo.commit(files, message, opts['user'], opts['date'], match,
                    force_editor=opts.get('force_editor'))
    except ValueError, inst:
        raise util.Abort(str(inst))

def docopy(ui, repo, pats, opts, wlock):
    # called with the repo lock held
    cwd = repo.getcwd()
    errors = 0
    copied = []
    targets = {}

    def okaytocopy(abs, rel, exact):
        reasons = {'?': _('is not managed'),
                   'a': _('has been marked for add'),
                   'r': _('has been marked for remove')}
        state = repo.dirstate.state(abs)
        reason = reasons.get(state)
        if reason:
            if state == 'a':
                origsrc = repo.dirstate.copied(abs)
                if origsrc is not None:
                    return origsrc
            if exact:
                ui.warn(_('%s: not copying - file %s\n') % (rel, reason))
        else:
            return abs

    def copy(origsrc, abssrc, relsrc, target, exact):
        abstarget = util.canonpath(repo.root, cwd, target)
        reltarget = util.pathto(cwd, abstarget)
        prevsrc = targets.get(abstarget)
        if prevsrc is not None:
            ui.warn(_('%s: not overwriting - %s collides with %s\n') %
                    (reltarget, abssrc, prevsrc))
            return
        if (not opts['after'] and os.path.exists(reltarget) or
            opts['after'] and repo.dirstate.state(abstarget) not in '?r'):
            if not opts['force']:
                ui.warn(_('%s: not overwriting - file exists\n') %
                        reltarget)
                return
            if not opts['after'] and not opts.get('dry_run'):
                os.unlink(reltarget)
        if opts['after']:
            if not os.path.exists(reltarget):
                return
        else:
            targetdir = os.path.dirname(reltarget) or '.'
            if not os.path.isdir(targetdir) and not opts.get('dry_run'):
                os.makedirs(targetdir)
            try:
                restore = repo.dirstate.state(abstarget) == 'r'
                if restore and not opts.get('dry_run'):
                    repo.undelete([abstarget], wlock)
                try:
                    if not opts.get('dry_run'):
                        shutil.copyfile(relsrc, reltarget)
                        shutil.copymode(relsrc, reltarget)
                    restore = False
                finally:
                    if restore:
                        repo.remove([abstarget], wlock)
            except shutil.Error, inst:
                raise util.Abort(str(inst))
            except IOError, inst:
                if inst.errno == errno.ENOENT:
                    ui.warn(_('%s: deleted in working copy\n') % relsrc)
                else:
                    ui.warn(_('%s: cannot copy - %s\n') %
                            (relsrc, inst.strerror))
                    errors += 1
                    return
        if ui.verbose or not exact:
            ui.status(_('copying %s to %s\n') % (relsrc, reltarget))
        targets[abstarget] = abssrc
        if abstarget != origsrc and not opts.get('dry_run'):
            repo.copy(origsrc, abstarget, wlock)
        copied.append((abssrc, relsrc, exact))

    def targetpathfn(pat, dest, srcs):
        if os.path.isdir(pat):
            abspfx = util.canonpath(repo.root, cwd, pat)
            if destdirexists:
                striplen = len(os.path.split(abspfx)[0])
            else:
                striplen = len(abspfx)
            if striplen:
                striplen += len(os.sep)
            res = lambda p: os.path.join(dest, p[striplen:])
        elif destdirexists:
            res = lambda p: os.path.join(dest, os.path.basename(p))
        else:
            res = lambda p: dest
        return res

    def targetpathafterfn(pat, dest, srcs):
        if util.patkind(pat, None)[0]:
            # a mercurial pattern
            res = lambda p: os.path.join(dest, os.path.basename(p))
        else:
            abspfx = util.canonpath(repo.root, cwd, pat)
            if len(abspfx) < len(srcs[0][0]):
                # A directory. Either the target path contains the last
                # component of the source path or it does not.
                def evalpath(striplen):
                    score = 0
                    for s in srcs:
                        t = os.path.join(dest, s[0][striplen:])
                        if os.path.exists(t):
                            score += 1
                    return score

                striplen = len(abspfx)
                if striplen:
                    striplen += len(os.sep)
                if os.path.isdir(os.path.join(dest, os.path.split(abspfx)[1])):
                    score = evalpath(striplen)
                    striplen1 = len(os.path.split(abspfx)[0])
                    if striplen1:
                        striplen1 += len(os.sep)
                    if evalpath(striplen1) > score:
                        striplen = striplen1
                res = lambda p: os.path.join(dest, p[striplen:])
            else:
                # a file
                if destdirexists:
                    res = lambda p: os.path.join(dest, os.path.basename(p))
                else:
                    res = lambda p: dest
        return res


    pats = list(pats)
    if not pats:
        raise util.Abort(_('no source or destination specified'))
    if len(pats) == 1:
        raise util.Abort(_('no destination specified'))
    dest = pats.pop()
    destdirexists = os.path.isdir(dest)
    if (len(pats) > 1 or util.patkind(pats[0], None)[0]) and not destdirexists:
        raise util.Abort(_('with multiple sources, destination must be an '
                         'existing directory'))
    if opts['after']:
        tfn = targetpathafterfn
    else:
        tfn = targetpathfn
    copylist = []
    for pat in pats:
        srcs = []
        for tag, abssrc, relsrc, exact in cmdutil.walk(repo, [pat], opts):
            origsrc = okaytocopy(abssrc, relsrc, exact)
            if origsrc:
                srcs.append((origsrc, abssrc, relsrc, exact))
        if not srcs:
            continue
        copylist.append((tfn(pat, dest, srcs), srcs))
    if not copylist:
        raise util.Abort(_('no files to copy'))

    for targetpath, srcs in copylist:
        for origsrc, abssrc, relsrc, exact in srcs:
            copy(origsrc, abssrc, relsrc, targetpath(abssrc), exact)

    if errors:
        ui.warn(_('(consider using --after)\n'))
    return errors, copied

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,
    there can only be one source.

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

    This command takes effect in the next commit.

    NOTE: This command should be treated as experimental. While it
    should properly record copied files, this information is not yet
    fully used by merge, nor fully reported by log.
    """
    wlock = repo.wlock(0)
    errs, copied = docopy(ui, repo, pats, opts, wlock)
    return errs

def debugancestor(ui, index, rev1, rev2):
    """find the ancestor revision of two revisions in a given index"""
    r = revlog.revlog(util.opener(os.getcwd(), audit=False), index, "", 0)
    a = r.ancestor(r.lookup(rev1), r.lookup(rev2))
    ui.write("%d:%s\n" % (r.rev(a), hex(a)))

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

    if opts['options']:
        options = []
        otables = [globalopts]
        if cmd:
            aliases, entry = findcmd(ui, cmd)
            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

    clist = findpossible(ui, cmd).keys()
    clist.sort()
    ui.write("%s\n" % "\n".join(clist))

def debugrebuildstate(ui, repo, rev=None):
    """rebuild the dirstate as it would look like for the given revision"""
    if not rev:
        rev = repo.changelog.tip()
    else:
        rev = repo.lookup(rev)
    change = repo.changelog.read(rev)
    n = change[0]
    files = repo.manifest.read(n)
    wlock = repo.wlock()
    repo.dirstate.rebuild(rev, files)

def debugcheckstate(ui, repo):
    """validate the correctness of the current dirstate"""
    parent1, parent2 = repo.dirstate.parents()
    repo.dirstate.read()
    dc = repo.dirstate.map
    keys = dc.keys()
    keys.sort()
    m1n = repo.changelog.read(parent1)[0]
    m2n = repo.changelog.read(parent2)[0]
    m1 = repo.manifest.read(m1n)
    m2 = repo.manifest.read(m2n)
    errors = 0
    for f in dc:
        state = repo.dirstate.state(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.state(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):
    """show combined config settings from all hgrc files

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

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

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

    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():
        sectname = section + '.' + name
        if values:
            for v in values:
                if v == section:
                    ui.write('%s=%s\n' % (sectname, value))
                elif v == sectname:
                    ui.write(value, '\n')
        else:
            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)

    repo.dirstate.setparents(repo.lookup(rev1), repo.lookup(rev2))

def debugstate(ui, repo):
    """show the contents of the current dirstate"""
    repo.dirstate.read()
    dc = repo.dirstate.map
    keys = dc.keys()
    keys.sort()
    for file_ in keys:
        ui.write("%c %3o %10d %s %s\n"
                 % (dc[file_][0], dc[file_][1] & 0777, dc[file_][2],
                    time.strftime("%x %X",
                                  time.localtime(dc[file_][3])), file_))
    for f in repo.dirstate.copies():
        ui.write(_("copy: %s -> %s\n") % (repo.dirstate.copied(f), f))

def debugdata(ui, file_, rev):
    """dump the contents of an data file revision"""
    r = revlog.revlog(util.opener(os.getcwd(), audit=False),
                      file_[:-2] + ".i", file_, 0)
    try:
        ui.write(r.revision(r.lookup(rev)))
    except KeyError:
        raise util.Abort(_('invalid revision identifier %s') % rev)

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

def debugindexdot(ui, file_):
    """dump an index DAG as a .dot file"""
    r = revlog.revlog(util.opener(os.getcwd(), audit=False), file_, "", 0)
    ui.write("digraph G {\n")
    for i in range(r.count()):
        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 debugrename(ui, repo, file, rev=None):
    """dump rename information"""
    r = repo.file(relpath(repo, [file])[0])
    if rev:
        try:
            # assume all revision numbers are for changesets
            n = repo.lookup(rev)
            change = repo.changelog.read(n)
            m = repo.manifest.read(change[0])
            n = m[relpath(repo, [file])[0]]
        except (hg.RepoError, KeyError):
            n = r.lookup(rev)
    else:
        n = r.tip()
    m = r.renamed(n)
    if m:
        ui.write(_("renamed from %s:%s\n") % (m[0], hex(m[1])))
    else:
        ui.write(_("not renamed\n"))

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

    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 option, diff will avoid generating diffs of files
    it detects as binary. With -a, diff will generate a diff anyway,
    probably with undesirable results.
    """
    node1, node2 = cmdutil.revpair(ui, repo, opts['rev'])

    fns, matchfn, anypats = cmdutil.matchpats(repo, pats, opts)

    patch.diff(repo, node1, node2, fns, match=matchfn,
               opts=patch.diffopts(ui, opts))

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 and commit comment.

    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 option, export will avoid generating diffs of files
    it detects as binary. With -a, export will generate a diff anyway,
    probably with undesirable results.

    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 = list(cmdutil.revrange(ui, repo, changesets))
    if len(revs) > 1:
        ui.note(_('exporting patches:\n'))
    else:
        ui.note(_('exporting patch:\n'))
    patch.export(repo, map(repo.lookup, revs), template=opts['output'],
                 switch_parent=opts['switch_parent'],
                 opts=patch.diffopts(ui, opts))

def forget(ui, repo, *pats, **opts):
    """don't add the specified files on the next commit (DEPRECATED)

    (DEPRECATED)
    Undo an 'hg add' scheduled for the next commit.

    This command is now deprecated and will be removed in a future
    release. Please use revert instead.
    """
    ui.warn(_("(the forget command is deprecated; use revert instead)\n"))
    forget = []
    for src, abs, rel, exact in cmdutil.walk(repo, pats, opts):
        if repo.dirstate.state(abs) == 'a':
            forget.append(abs)
            if ui.verbose or not exact:
                ui.status(_('forgetting %s\n') % ((pats and rel) or abs))
    repo.forget(forget)

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['ignore_case']:
        reflags |= re.I
    regexp = re.compile(pattern, reflags)
    sep, eol = ':', '\n'
    if opts['print0']:
        sep = eol = '\0'

    fcache = {}
    def getfile(fn):
        if fn not in fcache:
            fcache[fn] = repo.file(fn)
        return fcache[fn]

    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
            lend = body.find('\n', mend)
            yield linenum, mstart - lstart, mend - lstart, body[lstart:lend]
            begin = lend + 1

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

        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 range(blo, bhi):
                    yield ('+', b[i])
            elif tag == 'delete':
                for i in range(alo, ahi):
                    yield ('-', a[i])
            elif tag == 'replace':
                for i in range(alo, ahi):
                    yield ('-', a[i])
                for i in range(blo, bhi):
                    yield ('+', b[i])

    prev = {}
    ucache = {}
    def display(fn, rev, states, prevstates):
        counts = {'-': 0, '+': 0}
        filerevmatches = {}
        if incrementing or not opts['all']:
            a, b = prevstates, states
        else:
            a, b = states, prevstates
        for change, l in difflinestates(a, b):
            if incrementing or not opts['all']:
                r = rev
            else:
                r = prev[fn]
            cols = [fn, str(r)]
            if opts['line_number']:
                cols.append(str(l.linenum))
            if opts['all']:
                cols.append(change)
            if opts['user']:
                cols.append(trimuser(ui, getchange(r)[1], rev,
                                     ucache))
            if opts['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)
            counts[change] += 1
        return counts['+'], counts['-']

    fstate = {}
    skip = {}
    changeiter, getchange, matchfn = walkchangerevs(ui, repo, pats, opts)
    count = 0
    incrementing = False
    follow = opts.get('follow')
    for st, rev, fns in changeiter:
        if st == 'window':
            incrementing = rev
            matches.clear()
        elif st == 'add':
            change = repo.changelog.read(repo.lookup(str(rev)))
            mf = repo.manifest.read(change[0])
            matches[rev] = {}
            for fn in fns:
                if fn in skip:
                    continue
                fstate.setdefault(fn, {})
                try:
                    grepbody(fn, rev, getfile(fn).read(mf[fn]))
                    if follow:
                        copied = getfile(fn).renamed(mf[fn])
                        if copied:
                            copies.setdefault(rev, {})[fn] = copied[0]
                except KeyError:
                    pass
        elif st == 'iter':
            states = matches[rev].items()
            states.sort()
            for fn, m in states:
                copy = copies.get(rev, {}).get(fn)
                if fn in skip:
                    if copy:
                        skip[copy] = True
                    continue
                if incrementing or not opts['all'] or fstate[fn]:
                    pos, neg = display(fn, rev, m, fstate[fn])
                    count += pos + neg
                    if pos and not opts['all']:
                        skip[fn] = True
                        if copy:
                            skip[copy] = True
                fstate[fn] = m
                if copy:
                    fstate[copy] = m
                prev[fn] = rev

    if not incrementing:
        fstate = fstate.items()
        fstate.sort()
        for fn, state in fstate:
            if fn in skip:
                continue
            if fn not in copies.get(prev[fn], {}):
                display(fn, rev, {}, state)
    return (count == 0 and 1) or 0

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

    Show all repository head changesets.

    Repository "heads" are changesets that don't have children
    changesets. They are where development generally takes place and
    are the usual targets for update and merge operations.
    """
    if opts['rev']:
        heads = repo.heads(repo.lookup(opts['rev']))
    else:
        heads = repo.heads()
    br = None
    if opts['branches']:
        br = repo.branchlookup(heads)
    displayer = show_changeset(ui, repo, opts)
    for n in heads:
        displayer.show(changenode=n, brinfo=br)

def identify(ui, repo):
    """print information about the working copy

    Print a short summary of the current state of the repo.

    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, followed by a list of tags for this revision.
    """
    parents = [p for p in repo.dirstate.parents() if p != nullid]
    if not parents:
        ui.write(_("unknown\n"))
        return

    hexfunc = ui.debugflag and hex or short
    modified, added, removed, deleted = repo.status()[:4]
    output = ["%s%s" %
              ('+'.join([hexfunc(parent) for parent in parents]),
              (modified or added or removed or deleted) and "+" or "")]

    if not ui.quiet:
        # multiple tags for a single parent separated by '/'
        parenttags = ['/'.join(tags)
                      for tags in map(repo.nodetags, parents) if tags]
        # tags for multiple parents separated by ' + '
        if parenttags:
            output.append(' + '.join(parenttags))

    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.

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

    You can import a patch straight from a mail message.  Even patches
    as attachments work (body part must be type text/plain or
    text/x-patch to be used).  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 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 and -u override these.

    To read a patch from standard input, use patch name "-".
    """
    patches = (patch1,) + patches

    if not opts['force']:
        bail_if_changed(repo)

    d = opts["base"]
    strip = opts["strip"]

    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"))
            tmpname, message, user, date = patch.extract(ui, sys.stdin)
        else:
            ui.status(_("applying %s\n") % p)
            tmpname, message, user, date = patch.extract(ui, file(pf))

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

        try:
            if opts['message']:
                # pickup the cmdline msg
                message = opts['message']
            elif message:
                # pickup the patch msg
                message = message.strip()
            else:
                # launch the editor
                message = None
            ui.debug(_('message:\n%s\n') % message)

            files, fuzz = patch.patch(tmpname, ui, strip=strip, cwd=repo.root)
            files = patch.updatedir(ui, repo, files, wlock=wlock)
            repo.commit(files, message, user, date, wlock=wlock, lock=lock)
        finally:
            os.unlink(tmpname)

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 be pulled if a pull
    was requested.

    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.
    """
    source = ui.expandpath(source)
    setremoteconfig(ui, opts)

    other = hg.repository(ui, source)
    incoming = repo.findincoming(other, force=opts["force"])
    if not incoming:
        ui.status(_("no changes found\n"))
        return

    cleanup = None
    try:
        fname = opts["bundle"]
        if fname or not other.local():
            # create a bundle (uncompressed if other repo is not local)
            cg = other.changegroup(incoming, "incoming")
            fname = cleanup = write_bundle(cg, fname, compress=other.local())
            # keep written bundle?
            if opts["bundle"]:
                cleanup = None
            if not other.local():
                # use the created uncompressed bundlerepo
                other = bundlerepo.bundlerepository(ui, repo.root, fname)

        revs = None
        if opts['rev']:
            revs = [other.lookup(rev) for rev in opts['rev']]
        o = other.changelog.nodesbetween(incoming, revs)[0]
        if opts['newest_first']:
            o.reverse()
        displayer = show_changeset(ui, other, opts)
        for n in o:
            parents = [p for p in other.changelog.parents(n) if p != nullid]
            if opts['no_merges'] and len(parents) == 2:
                continue
            displayer.show(changenode=n)
            if opts['patch']:
                prev = (parents and parents[0]) or nullid
                patch.diff(other, prev, n, fp=repo.ui)
                ui.write("\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 is created.

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

    It is possible to specify an ssh:// URL as the destination.
    Look at the help text for the pull command for important details
    about ssh:// URLs.
    """
    setremoteconfig(ui, opts)
    hg.repository(ui, dest, create=1)

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

    Print all files under Mercurial control whose names match the
    given patterns.

    This command searches the current directory and its
    subdirectories.  To search an entire repository, move to the root
    of the repository.

    If no patterns are given to match, this command prints all file
    names.

    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 white space as multiple filenames.
    """
    end = opts['print0'] and '\0' or '\n'
    rev = opts['rev']
    if rev:
        node = repo.lookup(rev)
    else:
        node = None

    for src, abs, rel, exact in cmdutil.walk(repo, pats, opts, node=node,
                                             head='(?:.*/|)'):
        if not node and repo.dirstate.state(abs) == '?':
            continue
        if opts['fullpath']:
            ui.write(os.path.join(repo.root, abs), end)
        else:
            ui.write(((pats and rel) or abs), end)

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 file name to follow history across
    renames and copies. --follow without a file name 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.

    By default this command outputs: changeset id and hash, 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 is shown.
    """
    class dui(object):
        # Implement and delegate some ui protocol.  Save hunks of
        # output for later display in the desired order.
        def __init__(self, ui):
            self.ui = ui
            self.hunk = {}
            self.header = {}
        def bump(self, rev):
            self.rev = rev
            self.hunk[rev] = []
            self.header[rev] = []
        def note(self, *args):
            if self.verbose:
                self.write(*args)
        def status(self, *args):
            if not self.quiet:
                self.write(*args)
        def write(self, *args):
            self.hunk[self.rev].append(args)
        def write_header(self, *args):
            self.header[self.rev].append(args)
        def debug(self, *args):
            if self.debugflag:
                self.write(*args)
        def __getattr__(self, key):
            return getattr(self.ui, key)

    changeiter, getchange, matchfn = walkchangerevs(ui, repo, pats, opts)

    if opts['limit']:
        try:
            limit = int(opts['limit'])
        except ValueError:
            raise util.Abort(_('limit must be a positive integer'))
        if limit <= 0: raise util.Abort(_('limit must be positive'))
    else:
        limit = sys.maxint
    count = 0

    if opts['copies'] and opts['rev']:
        endrev = max([int(i)
                      for i in cmdutil.revrange(ui, repo, opts['rev'])]) + 1
    else:
        endrev = repo.changelog.count()
    rcache = {}
    ncache = {}
    dcache = []
    def getrenamed(fn, rev, man):
        '''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 xrange(fl.count()):
                node = fl.node(i)
                lr = fl.linkrev(node)
                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]
        mr = repo.manifest.rev(man)
        if repo.manifest.parentrevs(mr) != (mr - 1, -1):
            return ncache[fn].get(repo.manifest.find(man, fn)[0])
        if not dcache or dcache[0] != man:
            dcache[:] = [man, repo.manifest.readdelta(man)]
        if fn in dcache[1]:
            return ncache[fn].get(dcache[1][fn])
        return None

    displayer = show_changeset(ui, repo, opts)
    for st, rev, fns in changeiter:
        if st == 'window':
            du = dui(ui)
            displayer.ui = du
        elif st == 'add':
            du.bump(rev)
            changenode = repo.changelog.node(rev)
            parents = [p for p in repo.changelog.parents(changenode)
                       if p != nullid]
            if opts['no_merges'] and len(parents) == 2:
                continue
            if opts['only_merges'] and len(parents) != 2:
                continue

            if opts['keyword']:
                changes = getchange(rev)
                miss = 0
                for k in [kw.lower() for kw in opts['keyword']]:
                    if not (k in changes[1].lower() or
                            k in changes[4].lower() or
                            k in " ".join(changes[3][:20]).lower()):
                        miss = 1
                        break
                if miss:
                    continue

            br = None
            if opts['branches']:
                br = repo.branchlookup([repo.changelog.node(rev)])

            copies = []
            if opts.get('copies') and rev:
                mf = getchange(rev)[0]
                for fn in getchange(rev)[3]:
                    rename = getrenamed(fn, rev, mf)
                    if rename:
                        copies.append((fn, rename[0]))
            displayer.show(rev, brinfo=br, copies=copies)
            if opts['patch']:
                prev = (parents and parents[0]) or nullid
                patch.diff(repo, prev, changenode, match=matchfn, fp=du)
                du.write("\n\n")
        elif st == 'iter':
            if count == limit: break
            if du.header[rev]:
                for args in du.header[rev]:
                    ui.write_header(*args)
            if du.hunk[rev]:
                count += 1
                for args in du.hunk[rev]:
                    ui.write(*args)

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

    Print a list of version controlled files for the given revision.

    The manifest is the list of files being version controlled. If no revision
    is given then the tip is used.
    """
    if rev:
        try:
            # assume all revision numbers are for changesets
            n = repo.lookup(rev)
            change = repo.changelog.read(n)
            n = change[0]
        except hg.RepoError:
            n = repo.manifest.lookup(rev)
    else:
        n = repo.manifest.tip()
    m = repo.manifest.read(n)
    files = m.keys()
    files.sort()

    for f in files:
        ui.write("%40s %3s %s\n" % (hex(m[f]),
                                    m.execf(f) and "755" or "644", f))

def merge(ui, repo, node=None, force=None, branch=None):
    """Merge working directory with another revision

    Merge the contents of the current working directory and the
    requested 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 are allowed.

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

    if node or branch:
        node = _lookup(repo, node, branch)
    else:
        heads = repo.heads()
        if len(heads) > 2:
            raise util.Abort(_('repo has %d heads - '
                               'please merge with an explicit rev') %
                             len(heads))
        if len(heads) == 1:
            raise util.Abort(_('there is nothing to merge - '
                               'use "hg update" instead'))
        parent = repo.dirstate.parents()[0]
        if parent not in heads:
            raise util.Abort(_('working dir not at a head rev - '
                               'use "hg update" or merge with an explicit rev'))
        node = parent == heads[0] and heads[-1] or heads[0]
    return hg.merge(repo, node, force=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.
    """
    dest = ui.expandpath(dest or 'default-push', dest or 'default')
    setremoteconfig(ui, opts)
    revs = None
    if opts['rev']:
        revs = [repo.lookup(rev) for rev in opts['rev']]

    other = hg.repository(ui, dest)
    o = repo.findoutgoing(other, force=opts['force'])
    if not o:
        ui.status(_("no changes found\n"))
        return
    o = repo.changelog.nodesbetween(o, revs)[0]
    if opts['newest_first']:
        o.reverse()
    displayer = show_changeset(ui, repo, opts)
    for n in o:
        parents = [p for p in repo.changelog.parents(n) if p != nullid]
        if opts['no_merges'] and len(parents) == 2:
            continue
        displayer.show(changenode=n)
        if opts['patch']:
            prev = (parents and parents[0]) or nullid
            patch.diff(repo, prev, n)
            ui.write("\n")

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

    Print the working directory's parent revisions.
    """
    # legacy
    if file_ and not rev:
        try:
            rev = repo.lookup(file_)
            file_ = None
        except hg.RepoError:
            pass
        else:
            ui.warn(_("'hg parent REV' is deprecated, "
                      "please use 'hg parents -r REV instead\n"))

    if rev:
        if file_:
            ctx = repo.filectx(file_, changeid=rev)
        else:
            ctx = repo.changectx(rev)
        p = [cp.node() for cp in ctx.parents()]
    else:
        p = repo.dirstate.parents()

    br = None
    if branches is not None:
        br = repo.branchlookup(p)
    displayer = show_changeset(ui, repo, opts)
    for n in p:
        if n != nullid:
            displayer.show(changenode=n, brinfo=br)

def paths(ui, repo, search=None):
    """show definition of symbolic path names

    Show definition of symbolic path name NAME. If no name is given, show
    definition of 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.
    """
    if search:
        for name, path in ui.configitems("paths"):
            if name == search:
                ui.write("%s\n" % path)
                return
        ui.warn(_("not found!\n"))
        return 1
    else:
        for name, path in ui.configitems("paths"):
            ui.write("%s = %s\n" % (name, path))

def postincoming(ui, repo, modheads, optupdate):
    if modheads == 0:
        return
    if optupdate:
        if modheads == 1:
            return hg.update(repo, repo.changelog.tip()) # update
        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 the local repository. By default, this
    does not update the copy of the project in the working directory.

    Valid URLs are of the form:

      local/filesystem/path
      http://[user@]host[:port]/[path]
      https://[user@]host[:port]/[path]
      ssh://[user@]host[:port]/[path]

    Some notes about using SSH with Mercurial:
    - SSH requires an accessible shell account on the destination machine
      and a copy of hg in the remote path or specified with as remotecmd.
    - path is relative to the remote user's home directory by default.
      Use an extra slash at the start of a path to specify an absolute path:
        ssh://example.com//tmp/repository
    - Mercurial doesn't use its own compression via SSH; the right thing
      to do is to configure it in your ~/.ssh/ssh_config, e.g.:
        Host *.mylocalnetwork.example.com
          Compression off
        Host *
          Compression on
      Alternatively specify "ssh -C" as your ssh command in your hgrc or
      with the --ssh command line option.
    """
    source = ui.expandpath(source)
    setremoteconfig(ui, opts)

    other = hg.repository(ui, source)
    ui.status(_('pulling from %s\n') % (source))
    revs = None
    if opts['rev'] and not other.local():
        raise util.Abort(_("pull -r doesn't work for remote repositories yet"))
    elif opts['rev']:
        revs = [other.lookup(rev) for rev in opts['rev']]
    modheads = repo.pull(other, heads=revs, force=opts['force'])
    return postincoming(ui, repo, modheads, opts['update'])

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 helps to move
    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
    the client has forgotten to sync and merge before pushing.

    Valid URLs are of the form:

      local/filesystem/path
      ssh://[user@]host[:port]/[path]

    Look at the help text for the pull command for important details
    about ssh:// URLs.

    Pushing to http:// and https:// URLs is possible, too, if this
    feature is enabled on the remote Mercurial server.
    """
    dest = ui.expandpath(dest or 'default-push', dest or 'default')
    setremoteconfig(ui, opts)

    other = hg.repository(ui, dest)
    ui.status('pushing to %s\n' % (dest))
    revs = None
    if opts['rev']:
        revs = [repo.lookup(rev) for rev in opts['rev']]
    r = repo.push(other, opts['force'], revs=revs)
    return r == 0

def rawcommit(ui, repo, *flist, **rc):
    """raw commit interface (DEPRECATED)

    (DEPRECATED)
    Lowlevel commit, for use in helper scripts.

    This command is not intended to be used by normal users, as it is
    primarily useful for importing from other SCMs.

    This command is now deprecated and will be removed in a future
    release, please use debugsetparents and commit instead.
    """

    ui.warn(_("(the rawcommit command is deprecated)\n"))

    message = rc['message']
    if not message and rc['logfile']:
        try:
            message = open(rc['logfile']).read()
        except IOError:
            pass
    if not message and not rc['logfile']:
        raise util.Abort(_("missing commit message"))

    files = relpath(repo, list(flist))
    if rc['files']:
        files += open(rc['files']).read().splitlines()

    rc['parent'] = map(repo.lookup, rc['parent'])

    try:
        repo.rawcommit(files, message, rc['user'], rc['date'], *rc['parent'])
    except ValueError, inst:
        raise util.Abort(str(inst))

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 command schedules the files to be removed at the next commit.
    This only removes files from the current branch, not from the
    entire project history.  If the files still exist in the working
    directory, they will be deleted from it.  If invoked with --after,
    files that have been manually deleted are marked as removed.

    Modified files and added files are not removed by default.  To
    remove them, use the -f/--force option.
    """
    names = []
    if not opts['after'] and not pats:
        raise util.Abort(_('no files specified'))
    files, matchfn, anypats = cmdutil.matchpats(repo, pats, opts)
    exact = dict.fromkeys(files)
    mardu = map(dict.fromkeys, repo.status(files=files, match=matchfn))[:5]
    modified, added, removed, deleted, unknown = mardu
    remove, forget = [], []
    for src, abs, rel, exact in cmdutil.walk(repo, pats, opts):
        reason = None
        if abs not in deleted and opts['after']:
            reason = _('is still present')
        elif abs in modified and not opts['force']:
            reason = _('is modified (use -f to force removal)')
        elif abs in added:
            if opts['force']:
                forget.append(abs)
                continue
            reason = _('has been marked for add (use -f to force removal)')
        elif abs in unknown:
            reason = _('is not managed')
        elif abs in removed:
            continue
        if reason:
            if exact:
                ui.warn(_('not removing %s: file %s\n') % (rel, reason))
        else:
            if ui.verbose or not exact:
                ui.status(_('removing %s\n') % rel)
            remove.append(abs)
    repo.forget(forget)
    repo.remove(remove, unlink=not opts['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
    stand in the working directory.  If invoked with --after, the
    operation is recorded, but no copying is performed.

    This command takes effect in the next commit.

    NOTE: This command should be treated as experimental. While it
    should properly record rename files, this information is not yet
    fully used by merge, nor fully reported by log.
    """
    wlock = repo.wlock(0)
    errs, copied = docopy(ui, repo, pats, opts, wlock)
    names = []
    for abs, rel, exact in copied:
        if ui.verbose or not exact:
            ui.status(_('removing %s\n') % rel)
        names.append(abs)
    if not opts.get('dry_run'):
        repo.remove(names, True, wlock)
    return errs

def revert(ui, repo, *pats, **opts):
    """revert files or dirs to their states as of some revision

    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.  If the working directory has two parents, you must
    explicitly specify the revision to revert to.

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

    Using the -r 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 a change that should not have been committed.

    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 recreated.  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.
    """

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

    parent, p2 = repo.dirstate.parents()
    if not opts['rev'] and p2 != nullid:
        raise util.Abort(_('uncommitted merge - please provide a '
                           'specific revision'))
    node = repo.changectx(opts['rev']).node()
    mf = repo.manifest.read(repo.changelog.read(node)[0])
    if node == parent:
        pmf = mf
    else:
        pmf = None

    wlock = repo.wlock()

    # 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 = {}
    target_only = {}

    # walk dirstate.

    for src, abs, rel, exact in cmdutil.walk(repo, pats, opts,
                                             badmatch=mf.has_key):
        names[abs] = (rel, exact)
        if src == 'b':
            target_only[abs] = True

    # walk target manifest.

    for src, abs, rel, exact in cmdutil.walk(repo, pats, opts, node=node,
                                             badmatch=names.has_key):
        if abs in names: continue
        names[abs] = (rel, exact)
        target_only[abs] = True

    changes = repo.status(match=names.has_key, wlock=wlock)[:5]
    modified, added, removed, deleted, unknown = map(dict.fromkeys, changes)

    revert = ([], _('reverting %s\n'))
    add = ([], _('adding %s\n'))
    remove = ([], _('removing %s\n'))
    forget = ([], _('forgetting %s\n'))
    undelete = ([], _('undeleting %s\n'))
    update = {}

    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, forget, True, False),
        (removed, undelete, None, False, False),
        (deleted, revert, remove, False, False),
        (unknown, add, None, True, False),
        (target_only, add, None, False, False),
        )

    entries = names.items()
    entries.sort()

    for abs, (rel, exact) in entries:
        mfentry = mf.get(abs)
        def handle(xlist, dobackup):
            xlist[0].append(abs)
            update[abs] = 1
            if dobackup and not opts['no_backup'] and os.path.exists(rel):
                bakname = "%s.orig" % rel
                ui.note(_('saving current version of %s as %s\n') %
                        (rel, bakname))
                if not opts.get('dry_run'):
                    shutil.copyfile(rel, bakname)
                    shutil.copymode(rel, bakname)
            if ui.verbose or not exact:
                ui.status(xlist[1] % 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)
            else:
                if exact: ui.warn(_('file not managed: %s\n' % rel))
            break
        else:
            # 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.manifest.read(repo.changelog.read(parent)[0])
            if abs in pmf:
                if mfentry:
                    # if version of file is same in parent and target
                    # manifests, do nothing
                    if pmf[abs] != mfentry:
                        handle(revert, False)
                else:
                    handle(remove, False)

    if not opts.get('dry_run'):
        repo.dirstate.forget(forget[0])
        r = hg.revert(repo, node, update.has_key, wlock)
        repo.dirstate.update(add[0], 'a')
        repo.dirstate.update(undelete[0], 'n')
        repo.dirstate.update(remove[0], 'r')
        return r

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

    Roll back the last transaction in this repository, restoring the
    project to its state prior to the transaction.

    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 should be used with care. There is only one level of
    rollback, and there is no way to undo a rollback.

    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 dir

    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" and "-E" options to log to files.
    """

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

    optlist = ("name templates style address port ipv6"
               " accesslog errorlog webdir_conf")
    for o in optlist.split():
        if opts[o]:
            ui.setconfig("web", o, str(opts[o]))

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

    if opts['daemon'] and not opts['daemon_pipefds']:
        rfd, wfd = os.pipe()
        args = sys.argv[:]
        args.append('--daemon-pipefds=%d,%d' % (rfd, wfd))
        pid = os.spawnvp(os.P_NOWAIT | getattr(os, 'P_DETACH', 0),
                         args[0], args)
        os.close(wfd)
        os.read(rfd, 1)
        os._exit(0)

    try:
        httpd = hgweb.server.create_server(ui, repo)
    except socket.error, inst:
        raise util.Abort(_('cannot start server: %s') % inst.args[1])

    if ui.verbose:
        addr, port = httpd.socket.getsockname()
        if addr == '0.0.0.0':
            addr = socket.gethostname()
        else:
            try:
                addr = socket.gethostbyaddr(addr)[0]
            except socket.error:
                pass
        if port != 80:
            ui.status(_('listening at http://%s:%d/\n') % (addr, port))
        else:
            ui.status(_('listening at http://%s/\n') % addr)

    if opts['pid_file']:
        fp = open(opts['pid_file'], 'w')
        fp.write(str(os.getpid()) + '\n')
        fp.close()

    if opts['daemon_pipefds']:
        rfd, wfd = [int(x) for x in opts['daemon_pipefds'].split(',')]
        os.close(rfd)
        os.write(wfd, 'y')
        os.close(wfd)
        sys.stdout.flush()
        sys.stderr.flush()
        fd = os.open(util.nulldev, os.O_RDWR)
        if fd != 0: os.dup2(fd, 0)
        if fd != 1: os.dup2(fd, 1)
        if fd != 2: os.dup2(fd, 2)
        if fd not in (0, 1, 2): os.close(fd)

    httpd.serve_forever()

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, are
    not listed unless -c (clean), -i (ignored) or -A is given.

    The codes used to show the status of files are:
    M = modified
    A = added
    R = removed
    C = clean
    ! = deleted, but still tracked
    ? = not tracked
    I = ignored (not shown by default)
      = the previous added file was copied from here
    """

    all = opts['all']

    files, matchfn, anypats = cmdutil.matchpats(repo, pats, opts)
    cwd = (pats and repo.getcwd()) or ''
    modified, added, removed, deleted, unknown, ignored, clean = [
        [util.pathto(cwd, x) for x in n]
        for n in repo.status(files=files, match=matchfn,
                             list_ignored=all or opts['ignored'],
                             list_clean=all or opts['clean'])]

    changetypes = (('modified', 'M', modified),
                   ('added', 'A', added),
                   ('removed', 'R', removed),
                   ('deleted', '!', deleted),
                   ('unknown', '?', unknown),
                   ('ignored', 'I', ignored))

    explicit_changetypes = changetypes + (('clean', 'C', clean),)

    end = opts['print0'] and '\0' or '\n'

    for opt, char, changes in ([ct for ct in explicit_changetypes
                                if all or opts[ct[0]]]
                               or changetypes):
        if opts['no_status']:
            format = "%%s%s" % end
        else:
            format = "%s %%s%s" % (char, end)

        for f in changes:
            ui.write(format % f)
            if ((all or opts.get('copies')) and not opts.get('no_status')):
                copied = repo.dirstate.copied(f)
                if copied:
                    ui.write('  %s%s' % (copied, end))

def tag(ui, repo, name, rev_=None, **opts):
    """add a tag for the current tip or a 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 revision, 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.

    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).
    """
    if name in ['tip', '.']:
        raise util.Abort(_("the name '%s' is reserved") % name)
    if rev_ is not None:
        ui.warn(_("use of 'hg tag NAME [REV]' is deprecated, "
                  "please use 'hg tag [-r REV] NAME' instead\n"))
        if opts['rev']:
            raise util.Abort(_("use only one form to specify the revision"))
    if opts['rev']:
        rev_ = opts['rev']
    if not rev_ and repo.dirstate.parents()[1] != nullid:
        raise util.Abort(_('uncommitted merge - please provide a '
                           'specific revision'))
    r = repo.changectx(rev_).node()

    message = opts['message']
    if not message:
        message = _('Added tag %s for changeset %s') % (name, short(r))

    repo.tag(name, r, message, opts['local'], opts['user'], opts['date'])

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

    List the repository tags.

    This lists both regular and local tags.
    """

    l = repo.tagslist()
    l.reverse()
    hexfunc = ui.debugflag and hex or short
    for t, n in l:
        try:
            r = "%5d:%s" % (repo.changelog.rev(n), hexfunc(n))
        except KeyError:
            r = "    ?:?"
        if ui.quiet:
            ui.write("%s\n" % t)
        else:
            ui.write("%-30s %s\n" % (t, r))

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

    Show the tip revision.
    """
    n = repo.changelog.tip()
    br = None
    if opts['branches']:
        br = repo.branchlookup([n])
    show_changeset(ui, repo, opts).show(changenode=n, brinfo=br)
    if opts['patch']:
        patch.diff(repo, repo.changelog.parents(n)[0], n)

def unbundle(ui, repo, fname, **opts):
    """apply a changegroup file

    Apply a compressed changegroup file generated by the bundle
    command.
    """
    f = urllib.urlopen(fname)

    header = f.read(6)
    if not header.startswith("HG"):
        raise util.Abort(_("%s: not a Mercurial bundle file") % fname)
    elif not header.startswith("HG10"):
        raise util.Abort(_("%s: unknown bundle version") % fname)
    elif header == "HG10BZ":
        def generator(f):
            zd = bz2.BZ2Decompressor()
            zd.decompress("BZ")
            for chunk in f:
                yield zd.decompress(chunk)
    elif header == "HG10UN":
        def generator(f):
            for chunk in f:
                yield chunk
    else:
        raise util.Abort(_("%s: unknown bundle compression type")
                         % fname)
    gen = generator(util.filechunkiter(f, 4096))
    modheads = repo.addchangegroup(util.chunkbuffer(gen), 'unbundle',
                                   'bundle:' + fname)
    return postincoming(ui, repo, modheads, opts['update'])

def undo(ui, repo):
    """undo the last commit or pull (DEPRECATED)

    (DEPRECATED)
    This command is now deprecated and will be removed in a future
    release. Please use the rollback command instead.  For usage
    instructions, see the rollback command.
    """
    ui.warn(_('(the undo command is deprecated; use rollback instead)\n'))
    repo.rollback()

def update(ui, repo, node=None, merge=False, clean=False, force=None,
           branch=None):
    """update or merge working directory

    Update the working directory to the specified revision.

    If there are no outstanding changes in the working directory and
    there is a linear relationship between the current version and the
    requested version, the result is the requested version.

    To merge the working directory with another revision, use the
    merge command.

    By default, update will refuse to run if doing so would require
    merging or discarding local changes.
    """
    node = _lookup(repo, node, branch)
    if merge:
        ui.warn(_('(the -m/--merge option is deprecated; '
                  'use the merge command instead)\n'))
        return hg.merge(repo, node, force=force)
    elif clean:
        return hg.clean(repo, node)
    else:
        return hg.update(repo, node)

def _lookup(repo, node, branch=None):
    if branch:
        br = repo.branchlookup(branch=branch)
        found = []
        for x in br:
            if branch in br[x]:
                found.append(x)
        if len(found) > 1:
            repo.ui.warn(_("Found multiple heads for %s\n") % branch)
            for x in found:
                show_changeset(ui, repo, {}).show(changenode=x, brinfo=br)
            raise util.Abort("")
        if len(found) == 1:
            node = found[0]
            repo.ui.warn(_("Using head %s for branch %s\n")
                         % (short(node), branch))
        else:
            raise util.Abort(_("branch %s not found") % branch)
    else:
        node = node and repo.lookup(node) or repo.changelog.tip()
    return node

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)

# Command options and aliases are listed here, alphabetically

globalopts = [
    ('R', 'repository', '',
     _('repository root directory or symbolic path name')),
    ('', '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')),
    ('', 'lsprof', None, _('print improved command execution profile')),
    ('', 'traceback', None, _('print 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')),
]

table = {
    "^add":
        (add,
         walkopts + dryrunopts,
         _('hg add [OPTION]... [FILE]...')),
    "addremove":
        (addremove,
         [('s', 'similarity', '',
           _('guess renamed files by similarity (0<=s<=100)')),
         ] + walkopts + dryrunopts,
         _('hg addremove [OPTION]... [FILE]...')),
    "^annotate":
        (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')),
          ('d', 'date', None, _('list the date')),
          ('n', 'number', None, _('list the revision number (default)')),
          ('c', 'changeset', None, _('list the changeset')),
         ] + walkopts,
         _('hg annotate [-r REV] [-a] [-u] [-d] [-n] [-c] 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,
         _('hg archive [OPTION]... DEST')),
    "backout":
        (backout,
         [('', 'merge', None,
           _('merge with old dirstate parent after backout')),
          ('m', 'message', '', _('use <text> as commit message')),
          ('l', 'logfile', '', _('read commit message from <file>')),
          ('d', 'date', '', _('record datecode as commit date')),
          ('', 'parent', '', _('parent to choose when backing out merge')),
          ('u', 'user', '', _('record user as committer')),
         ] + walkopts,
         _('hg backout [OPTION]... REV')),
    "bundle":
        (bundle,
         [('f', 'force', None,
           _('run even when remote repository is unrelated')),
          ('r', 'rev', [],
           _('a changeset you would like to bundle')),
          ('', 'base', [],
           _('a base changeset to specify instead of a destination')),
         ] + remoteopts,
         _('hg bundle [--base REV]... [--rev REV]... FILE [DEST]')),
    "cat":
        (cat,
         [('o', 'output', '', _('print output to file with formatted name')),
          ('r', 'rev', '', _('print the given revision')),
         ] + walkopts,
         _('hg cat [OPTION]... FILE...')),
    "^clone":
        (clone,
         [('U', 'noupdate', None, _('do not update the new working directory')),
          ('r', 'rev', [],
           _('a changeset you would like to have after cloning')),
          ('', 'pull', None, _('use pull protocol to copy metadata')),
          ('', 'uncompressed', None,
           _('use uncompressed transfer (fast over LAN)')),
         ] + remoteopts,
         _('hg clone [OPTION]... SOURCE [DEST]')),
    "^commit|ci":
        (commit,
         [('A', 'addremove', None,
           _('mark new/missing files as added/removed before committing')),
          ('m', 'message', '', _('use <text> as commit message')),
          ('l', 'logfile', '', _('read the commit message from <file>')),
          ('d', 'date', '', _('record datecode as commit date')),
          ('u', 'user', '', _('record user as commiter')),
         ] + walkopts,
         _('hg commit [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,
         _('hg copy [OPTION]... [SOURCE]... DEST')),
    "debugancestor": (debugancestor, [], _('debugancestor INDEX REV1 REV2')),
    "debugcomplete":
        (debugcomplete,
         [('o', 'options', None, _('show the command options'))],
         _('debugcomplete [-o] CMD')),
    "debugrebuildstate":
        (debugrebuildstate,
         [('r', 'rev', '', _('revision to rebuild to'))],
         _('debugrebuildstate [-r REV] [REV]')),
    "debugcheckstate": (debugcheckstate, [], _('debugcheckstate')),
    "debugsetparents": (debugsetparents, [], _('debugsetparents REV1 [REV2]')),
    "debugstate": (debugstate, [], _('debugstate')),
    "debugdata": (debugdata, [], _('debugdata FILE REV')),
    "debugindex": (debugindex, [], _('debugindex FILE')),
    "debugindexdot": (debugindexdot, [], _('debugindexdot FILE')),
    "debugrename": (debugrename, [], _('debugrename FILE [REV]')),
    "debugwalk":
        (debugwalk, walkopts, _('debugwalk [OPTION]... [FILE]...')),
    "^diff":
        (diff,
         [('r', 'rev', [], _('revision')),
          ('a', 'text', None, _('treat all files as text')),
          ('p', 'show-function', None,
           _('show which function each change is in')),
          ('g', 'git', None, _('use git extended diff format')),
          ('', 'nodates', None, _("don't include dates in diff headers")),
          ('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')),
         ] + walkopts,
         _('hg diff [-a] [-I] [-X] [-r REV1 [-r REV2]] [FILE]...')),
    "^export":
        (export,
         [('o', 'output', '', _('print output to file with formatted name')),
          ('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")),
          ('', 'switch-parent', None, _('diff against the second parent'))],
         _('hg export [-a] [-o OUTFILESPEC] REV...')),
    "debugforget|forget":
        (forget, walkopts, _('hg forget [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 revs that match')),
          ('n', 'line-number', None, _('print matching line numbers')),
          ('r', 'rev', [], _('search in given revision range')),
          ('u', 'user', None, _('print user who committed change')),
         ] + walkopts,
         _('hg grep [OPTION]... PATTERN [FILE]...')),
    "heads":
        (heads,
         [('b', 'branches', None, _('show branches')),
          ('', 'style', '', _('display using template map file')),
          ('r', 'rev', '', _('show only heads which are descendants of rev')),
          ('', 'template', '', _('display with template'))],
         _('hg heads [-b] [-r <rev>]')),
    "help": (help_, [], _('hg help [COMMAND]')),
    "identify|id": (identify, [], _('hg identify')),
    "import|patch":
        (import_,
         [('p', 'strip', 1,
           _('directory strip option for patch. This has the same\n'
             'meaning as the corresponding patch option')),
          ('m', 'message', '', _('use <text> as commit message')),
          ('b', 'base', '', _('base path')),
          ('f', 'force', None,
           _('skip check for outstanding uncommitted changes'))],
         _('hg import [-p NUM] [-b BASE] [-m MESSAGE] [-f] PATCH...')),
    "incoming|in": (incoming,
         [('M', 'no-merges', None, _('do not show merges')),
          ('f', 'force', None,
           _('run even when remote repository is unrelated')),
          ('', 'style', '', _('display using template map file')),
          ('n', 'newest-first', None, _('show newest record first')),
          ('', 'bundle', '', _('file to store the bundles into')),
          ('p', 'patch', None, _('show patch')),
          ('r', 'rev', [], _('a specific revision up to which you would like to pull')),
          ('', 'template', '', _('display with template')),
         ] + remoteopts,
         _('hg incoming [-p] [-n] [-M] [-r REV]...'
           ' [--bundle FILENAME] [SOURCE]')),
    "^init":
        (init, remoteopts, _('hg init [-e FILE] [--remotecmd FILE] [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,
         _('hg locate [OPTION]... [PATTERN]...')),
    "^log|history":
        (log,
         [('b', 'branches', None, _('show branches')),
          ('f', 'follow', None,
           _('follow changeset history, or file history across copies and renames')),
          ('', 'follow-first', None,
           _('only follow the first parent of merge changesets')),
          ('C', 'copies', None, _('show copied files')),
          ('k', 'keyword', [], _('search for a keyword')),
          ('l', 'limit', '', _('limit number of changes displayed')),
          ('r', 'rev', [], _('show the specified revision or range')),
          ('M', 'no-merges', None, _('do not show merges')),
          ('', 'style', '', _('display using template map file')),
          ('m', 'only-merges', None, _('show only merges')),
          ('p', 'patch', None, _('show patch')),
          ('P', 'prune', [], _('do not display revision or any of its ancestors')),
          ('', 'template', '', _('display with template')),
         ] + walkopts,
         _('hg log [OPTION]... [FILE]')),
    "manifest": (manifest, [], _('hg manifest [REV]')),
    "merge":
        (merge,
         [('b', 'branch', '', _('merge with head of a specific branch')),
          ('f', 'force', None, _('force a merge with outstanding changes'))],
         _('hg merge [-b TAG] [-f] [REV]')),
    "outgoing|out": (outgoing,
         [('M', 'no-merges', None, _('do not show merges')),
          ('f', 'force', None,
           _('run even when remote repository is unrelated')),
          ('p', 'patch', None, _('show patch')),
          ('', 'style', '', _('display using template map file')),
          ('r', 'rev', [], _('a specific revision you would like to push')),
          ('n', 'newest-first', None, _('show newest record first')),
          ('', 'template', '', _('display with template')),
         ] + remoteopts,
         _('hg outgoing [-M] [-p] [-n] [-r REV]... [DEST]')),
    "^parents":
        (parents,
         [('b', 'branches', None, _('show branches')),
          ('r', 'rev', '', _('show parents from the specified rev')),
          ('', 'style', '', _('display using template map file')),
          ('', 'template', '', _('display with template'))],
         _('hg parents [-b] [-r REV] [FILE]')),
    "paths": (paths, [], _('hg paths [NAME]')),
    "^pull":
        (pull,
         [('u', 'update', None,
           _('update to new tip if changesets were pulled')),
          ('f', 'force', None,
           _('run even when remote repository is unrelated')),
          ('r', 'rev', [], _('a specific revision up to which you would like to pull')),
         ] + remoteopts,
         _('hg pull [-u] [-r REV]... [-e FILE] [--remotecmd FILE] [SOURCE]')),
    "^push":
        (push,
         [('f', 'force', None, _('force push')),
          ('r', 'rev', [], _('a specific revision you would like to push')),
         ] + remoteopts,
         _('hg push [-f] [-r REV]... [-e FILE] [--remotecmd FILE] [DEST]')),
    "debugrawcommit|rawcommit":
        (rawcommit,
         [('p', 'parent', [], _('parent')),
          ('d', 'date', '', _('date code')),
          ('u', 'user', '', _('user')),
          ('F', 'files', '', _('file list')),
          ('m', 'message', '', _('commit message')),
          ('l', 'logfile', '', _('commit message file'))],
         _('hg debugrawcommit [OPTION]... [FILE]...')),
    "recover": (recover, [], _('hg recover')),
    "^remove|rm":
        (remove,
         [('A', 'after', None, _('record remove that has already occurred')),
          ('f', 'force', None, _('remove file even if modified')),
         ] + walkopts,
         _('hg remove [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,
         _('hg rename [OPTION]... SOURCE... DEST')),
    "^revert":
        (revert,
         [('a', 'all', None, _('revert all changes when no arguments given')),
          ('r', 'rev', '', _('revision to revert to')),
          ('', 'no-backup', None, _('do not save backup copies of files')),
         ] + walkopts + dryrunopts,
         _('hg revert [-r REV] [NAME]...')),
    "rollback": (rollback, [], _('hg rollback')),
    "root": (root, [], _('hg root')),
    "showconfig|debugconfig": (showconfig, [], _('showconfig [NAME]...')),
    "^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 use (default: 8000)')),
          ('a', 'address', '', _('address to use')),
          ('n', 'name', '',
           _('name to show in web pages (default: working dir)')),
          ('', 'webdir-conf', '', _('name of the webdir config file'
                                    ' (serve more than one repo)')),
          ('', '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'))],
         _('hg serve [OPTION]...')),
    "^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 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')),
         ] + walkopts,
         _('hg status [OPTION]... [FILE]...')),
    "tag":
        (tag,
         [('l', 'local', None, _('make the tag local')),
          ('m', 'message', '', _('message for tag commit log entry')),
          ('d', 'date', '', _('record datecode as commit date')),
          ('u', 'user', '', _('record user as commiter')),
          ('r', 'rev', '', _('revision to tag'))],
         _('hg tag [-l] [-m TEXT] [-d DATE] [-u USER] [-r REV] NAME')),
    "tags": (tags, [], _('hg tags')),
    "tip":
        (tip,
         [('b', 'branches', None, _('show branches')),
          ('', 'style', '', _('display using template map file')),
          ('p', 'patch', None, _('show patch')),
          ('', 'template', '', _('display with template'))],
         _('hg tip [-b] [-p]')),
    "unbundle":
        (unbundle,
         [('u', 'update', None,
           _('update to new tip if changesets were unbundled'))],
         _('hg unbundle [-u] FILE')),
    "debugundo|undo": (undo, [], _('hg undo')),
    "^update|up|checkout|co":
        (update,
         [('b', 'branch', '', _('checkout the head of a specific branch')),
          ('m', 'merge', None, _('allow merging of branches (DEPRECATED)')),
          ('C', 'clean', None, _('overwrite locally modified files')),
          ('f', 'force', None, _('force a merge with outstanding changes'))],
         _('hg update [-b TAG] [-m] [-C] [-f] [REV]')),
    "verify": (verify, [], _('hg verify')),
    "version": (show_version, [], _('hg version')),
}

norepo = ("clone init version help debugancestor debugcomplete debugdata"
          " debugindex debugindexdot")
optionalrepo = ("paths serve showconfig")

def findpossible(ui, cmd):
    """
    Return cmd -> (aliases, command table entry)
    for each matching command.
    Return debug commands (or their aliases) only if no normal command matches.
    """
    choice = {}
    debugchoice = {}
    for e in table.keys():
        aliases = e.lstrip("^").split("|")
        found = None
        if cmd in aliases:
            found = cmd
        elif not ui.config("ui", "strict"):
            for a in aliases:
                if a.startswith(cmd):
                    found = a
                    break
        if found is not None:
            if aliases[0].startswith("debug") or found.startswith("debug"):
                debugchoice[found] = (aliases, table[e])
            else:
                choice[found] = (aliases, table[e])

    if not choice and debugchoice:
        choice = debugchoice

    return choice

def findcmd(ui, cmd):
    """Return (aliases, command table entry) for command string."""
    choice = findpossible(ui, cmd)

    if choice.has_key(cmd):
        return choice[cmd]

    if len(choice) > 1:
        clist = choice.keys()
        clist.sort()
        raise AmbiguousCommand(cmd, clist)

    if choice:
        return choice.values()[0]

    raise UnknownCommand(cmd)

def catchterm(*args):
    raise util.SignalInterrupt

def run():
    sys.exit(dispatch(sys.argv[1:]))

class ParseError(Exception):
    """Exception raised on errors in parsing the command line."""

def parse(ui, args):
    options = {}
    cmdoptions = {}

    try:
        args = fancyopts.fancyopts(args, globalopts, options)
    except fancyopts.getopt.GetoptError, inst:
        raise ParseError(None, inst)

    if args:
        cmd, args = args[0], args[1:]
        aliases, i = findcmd(ui, cmd)
        cmd = aliases[0]
        defaults = ui.config("defaults", cmd)
        if defaults:
            args = shlex.split(defaults) + args
        c = list(i[1])
    else:
        cmd = None
        c = []

    # combine global options into local
    for o in globalopts:
        c.append((o[0], o[1], options[o[1]], o[3]))

    try:
        args = fancyopts.fancyopts(args, c, cmdoptions)
    except fancyopts.getopt.GetoptError, inst:
        raise ParseError(cmd, inst)

    # separate global options back out
    for o in globalopts:
        n = o[1]
        options[n] = cmdoptions[n]
        del cmdoptions[n]

    return (cmd, cmd and i[0] or None, args, options, cmdoptions)

external = {}

def findext(name):
    '''return module with given extension name'''
    try:
        return sys.modules[external[name]]
    except KeyError:
        for k, v in external.iteritems():
            if k.endswith('.' + name) or k.endswith('/' + name) or v == name:
                return sys.modules[v]
        raise KeyError(name)

def load_extensions(ui):
    added = []
    for ext_name, load_from_name in ui.extensions():
        if ext_name in external:
            continue
        try:
            if load_from_name:
                # the module will be loaded in sys.modules
                # choose an unique name so that it doesn't
                # conflicts with other modules
                module_name = "hgext_%s" % ext_name.replace('.', '_')
                mod = imp.load_source(module_name, load_from_name)
            else:
                def importh(name):
                    mod = __import__(name)
                    components = name.split('.')
                    for comp in components[1:]:
                        mod = getattr(mod, comp)
                    return mod
                try:
                    mod = importh("hgext.%s" % ext_name)
                except ImportError:
                    mod = importh(ext_name)
            external[ext_name] = mod.__name__
            added.append((mod, ext_name))
        except (util.SignalInterrupt, KeyboardInterrupt):
            raise
        except Exception, inst:
            ui.warn(_("*** failed to import extension %s: %s\n") %
                    (ext_name, inst))
            if ui.print_exc():
                return 1

    for mod, name in added:
        uisetup = getattr(mod, 'uisetup', None)
        if uisetup:
            uisetup(ui)
        cmdtable = getattr(mod, 'cmdtable', {})
        for t in cmdtable:
            if t in table:
                ui.warn(_("module %s overrides %s\n") % (name, t))
        table.update(cmdtable)

def parseconfig(config):
    """parse the --config options from the command line"""
    parsed = []
    for cfg in config:
        try:
            name, value = cfg.split('=', 1)
            section, name = name.split('.', 1)
            if not section or not name:
                raise IndexError
            parsed.append((section, name, value))
        except (IndexError, ValueError):
            raise util.Abort(_('malformed --config option: %s') % cfg)
    return parsed

def dispatch(args):
    for name in 'SIGBREAK', 'SIGHUP', 'SIGTERM':
        num = getattr(signal, name, None)
        if num: signal.signal(num, catchterm)

    try:
        u = ui.ui(traceback='--traceback' in sys.argv[1:])
    except util.Abort, inst:
        sys.stderr.write(_("abort: %s\n") % inst)
        return -1

    load_extensions(u)
    u.addreadhook(load_extensions)

    try:
        cmd, func, args, options, cmdoptions = parse(u, args)
        if options["time"]:
            def get_times():
                t = os.times()
                if t[4] == 0.0: # Windows leaves this as zero, so use time.clock()
                    t = (t[0], t[1], t[2], t[3], time.clock())
                return t
            s = get_times()
            def print_time():
                t = get_times()
                u.warn(_("Time: real %.3f secs (user %.3f+%.3f sys %.3f+%.3f)\n") %
                    (t[4]-s[4], t[0]-s[0], t[2]-s[2], t[1]-s[1], t[3]-s[3]))
            atexit.register(print_time)

        # enter the debugger before command execution
        if options['debugger']:
            pdb.set_trace()

        try:
            if options['cwd']:
                try:
                    os.chdir(options['cwd'])
                except OSError, inst:
                    raise util.Abort('%s: %s' %
                                     (options['cwd'], inst.strerror))

            u.updateopts(options["verbose"], options["debug"], options["quiet"],
                         not options["noninteractive"], options["traceback"],
                         parseconfig(options["config"]))

            path = u.expandpath(options["repository"]) or ""
            repo = path and hg.repository(u, path=path) or None
            if repo and not repo.local():
                raise util.Abort(_("repository '%s' is not local") % path)

            if options['help']:
                return help_(u, cmd, options['version'])
            elif options['version']:
                return show_version(u)
            elif not cmd:
                return help_(u, 'shortlist')

            if cmd not in norepo.split():
                try:
                    if not repo:
                        repo = hg.repository(u, path=path)
                    u = repo.ui
                    for name in external.itervalues():
                        mod = sys.modules[name]
                        if hasattr(mod, 'reposetup'):
                            mod.reposetup(u, repo)
                            hg.repo_setup_hooks.append(mod.reposetup)
                except hg.RepoError:
                    if cmd not in optionalrepo.split():
                        raise
                d = lambda: func(u, repo, *args, **cmdoptions)
            else:
                d = lambda: func(u, *args, **cmdoptions)

            try:
                if options['profile']:
                    import hotshot, hotshot.stats
                    prof = hotshot.Profile("hg.prof")
                    try:
                        try:
                            return prof.runcall(d)
                        except:
                            try:
                                u.warn(_('exception raised - generating '
                                         'profile anyway\n'))
                            except:
                                pass
                            raise
                    finally:
                        prof.close()
                        stats = hotshot.stats.load("hg.prof")
                        stats.strip_dirs()
                        stats.sort_stats('time', 'calls')
                        stats.print_stats(40)
                elif options['lsprof']:
                    try:
                        from mercurial import lsprof
                    except ImportError:
                        raise util.Abort(_(
                            'lsprof not available - install from '
                            'http://codespeak.net/svn/user/arigo/hack/misc/lsprof/'))
                    p = lsprof.Profiler()
                    p.enable(subcalls=True)
                    try:
                        return d()
                    finally:
                        p.disable()
                        stats = lsprof.Stats(p.getstats())
                        stats.sort()
                        stats.pprint(top=10, file=sys.stderr, climit=5)
                else:
                    return d()
            finally:
                u.flush()
        except:
            # enter the debugger when we hit an exception
            if options['debugger']:
                pdb.post_mortem(sys.exc_info()[2])
            u.print_exc()
            raise
    except ParseError, inst:
        if inst.args[0]:
            u.warn(_("hg %s: %s\n") % (inst.args[0], inst.args[1]))
            help_(u, inst.args[0])
        else:
            u.warn(_("hg: %s\n") % inst.args[1])
            help_(u, 'shortlist')
    except AmbiguousCommand, inst:
        u.warn(_("hg: command '%s' is ambiguous:\n    %s\n") %
                (inst.args[0], " ".join(inst.args[1])))
    except UnknownCommand, inst:
        u.warn(_("hg: unknown command '%s'\n") % inst.args[0])
        help_(u, 'shortlist')
    except hg.RepoError, inst:
        u.warn(_("abort: %s!\n") % inst)
    except lock.LockHeld, inst:
        if inst.errno == errno.ETIMEDOUT:
            reason = _('timed out waiting for lock held by %s') % inst.locker
        else:
            reason = _('lock held by %s') % inst.locker
        u.warn(_("abort: %s: %s\n") % (inst.desc or inst.filename, reason))
    except lock.LockUnavailable, inst:
        u.warn(_("abort: could not lock %s: %s\n") %
               (inst.desc or inst.filename, inst.strerror))
    except revlog.RevlogError, inst:
        u.warn(_("abort: %s!\n") % inst)
    except util.SignalInterrupt:
        u.warn(_("killed!\n"))
    except KeyboardInterrupt:
        try:
            u.warn(_("interrupted!\n"))
        except IOError, inst:
            if inst.errno == errno.EPIPE:
                if u.debugflag:
                    u.warn(_("\nbroken pipe\n"))
            else:
                raise
    except IOError, inst:
        if hasattr(inst, "code"):
            u.warn(_("abort: %s\n") % inst)
        elif hasattr(inst, "reason"):
            u.warn(_("abort: error: %s\n") % inst.reason[1])
        elif hasattr(inst, "args") and inst[0] == errno.EPIPE:
            if u.debugflag:
                u.warn(_("broken pipe\n"))
        elif getattr(inst, "strerror", None):
            if getattr(inst, "filename", None):
                u.warn(_("abort: %s: %s\n") % (inst.strerror, inst.filename))
            else:
                u.warn(_("abort: %s\n") % inst.strerror)
        else:
            raise
    except OSError, inst:
        if getattr(inst, "filename", None):
            u.warn(_("abort: %s: %s\n") % (inst.strerror, inst.filename))
        else:
            u.warn(_("abort: %s\n") % inst.strerror)
    except util.Abort, inst:
        u.warn(_("abort: %s\n") % inst)
    except TypeError, inst:
        # was this an argument error?
        tb = traceback.extract_tb(sys.exc_info()[2])
        if len(tb) > 2: # no
            raise
        u.debug(inst, "\n")
        u.warn(_("%s: invalid arguments\n") % cmd)
        help_(u, cmd)
    except SystemExit, inst:
        # Commands shouldn't sys.exit directly, but give a return code.
        # Just in case catch this and and pass exit code to caller.
        return inst.code
    except:
        u.warn(_("** unknown exception encountered, details follow\n"))
        u.warn(_("** report bug details to "
                 "http://www.selenic.com/mercurial/bts\n"))
        u.warn(_("** or [e-mail]\n"))
        u.warn(_("** Mercurial Distributed SCM (version %s)\n")
               % version.get_version())
        raise

    return -1