view mercurial/dispatch.py @ 19296:da16d21cf4ed stable

doc: make it easier to read how to enable extensions

We tell people all the time that enabling extensions is not a scary
thing to do, but we don't make it easy enough for an absolute novice
to do so. When they see a suggestion to do "hg extfoo bar", the error
message tells them "see hg help extensions", but that help page
doesn't actually tell them where configuration files are.

Furthermore, the big warning about why extensions aren't enabled by
default should be pushed down a little bit. Most of the extensions
shipped by hg are not all that scary, and some very basic and useful
cosmetic extensions like graphlog, color, pager, and progress, should
be enabled for many hg users.

# dispatch.py - command dispatching for mercurial
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from i18n import _
import os, sys, atexit, signal, pdb, socket, errno, shlex, time, traceback, re
import util, commands, hg, fancyopts, extensions, hook, error
import cmdutil, encoding
import ui as uimod

class request(object):
    def __init__(self, args, ui=None, repo=None, fin=None, fout=None,
                 ferr=None):
        self.args = args
        self.ui = ui
        self.repo = repo

        # input/output/error streams
        self.fin = fin
        self.fout = fout
        self.ferr = ferr

def run():
    "run the command in sys.argv"
    sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255)

def dispatch(req):
    "run the command specified in req.args"
    if req.ferr:
        ferr = req.ferr
    elif req.ui:
        ferr = req.ui.ferr
    else:
        ferr = sys.stderr

    try:
        if not req.ui:
            req.ui = uimod.ui()
        if '--traceback' in req.args:
            req.ui.setconfig('ui', 'traceback', 'on')

        # set ui streams from the request
        if req.fin:
            req.ui.fin = req.fin
        if req.fout:
            req.ui.fout = req.fout
        if req.ferr:
            req.ui.ferr = req.ferr
    except util.Abort, inst:
        ferr.write(_("abort: %s\n") % inst)
        if inst.hint:
            ferr.write(_("(%s)\n") % inst.hint)
        return -1
    except error.ParseError, inst:
        if len(inst.args) > 1:
            ferr.write(_("hg: parse error at %s: %s\n") %
                             (inst.args[1], inst.args[0]))
        else:
            ferr.write(_("hg: parse error: %s\n") % inst.args[0])
        return -1

    msg = ' '.join(' ' in a and repr(a) or a for a in req.args)
    starttime = time.time()
    ret = None
    try:
        ret = _runcatch(req)
        return ret
    finally:
        duration = time.time() - starttime
        req.ui.log("commandfinish", "%s exited %s after %0.2f seconds\n",
                   msg, ret or 0, duration)

def _runcatch(req):
    def catchterm(*args):
        raise error.SignalInterrupt

    ui = req.ui
    try:
        for name in 'SIGBREAK', 'SIGHUP', 'SIGTERM':
            num = getattr(signal, name, None)
            if num:
                signal.signal(num, catchterm)
    except ValueError:
        pass # happens if called in a thread

    try:
        try:
            # enter the debugger before command execution
            if '--debugger' in req.args:
                ui.warn(_("entering debugger - "
                        "type c to continue starting hg or h for help\n"))
                pdb.set_trace()
            try:
                return _dispatch(req)
            finally:
                ui.flush()
        except: # re-raises
            # enter the debugger when we hit an exception
            if '--debugger' in req.args:
                traceback.print_exc()
                pdb.post_mortem(sys.exc_info()[2])
            ui.traceback()
            raise

    # Global exception handling, alphabetically
    # Mercurial-specific first, followed by built-in and library exceptions
    except error.AmbiguousCommand, inst:
        ui.warn(_("hg: command '%s' is ambiguous:\n    %s\n") %
                (inst.args[0], " ".join(inst.args[1])))
    except error.ParseError, inst:
        if len(inst.args) > 1:
            ui.warn(_("hg: parse error at %s: %s\n") %
                             (inst.args[1], inst.args[0]))
        else:
            ui.warn(_("hg: parse error: %s\n") % inst.args[0])
        return -1
    except error.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
        ui.warn(_("abort: %s: %s\n") % (inst.desc or inst.filename, reason))
    except error.LockUnavailable, inst:
        ui.warn(_("abort: could not lock %s: %s\n") %
               (inst.desc or inst.filename, inst.strerror))
    except error.CommandError, inst:
        if inst.args[0]:
            ui.warn(_("hg %s: %s\n") % (inst.args[0], inst.args[1]))
            commands.help_(ui, inst.args[0], full=False, command=True)
        else:
            ui.warn(_("hg: %s\n") % inst.args[1])
            commands.help_(ui, 'shortlist')
    except error.OutOfBandError, inst:
        ui.warn(_("abort: remote error:\n"))
        ui.warn(''.join(inst.args))
    except error.RepoError, inst:
        ui.warn(_("abort: %s!\n") % inst)
        if inst.hint:
            ui.warn(_("(%s)\n") % inst.hint)
    except error.ResponseError, inst:
        ui.warn(_("abort: %s") % inst.args[0])
        if not isinstance(inst.args[1], basestring):
            ui.warn(" %r\n" % (inst.args[1],))
        elif not inst.args[1]:
            ui.warn(_(" empty string\n"))
        else:
            ui.warn("\n%r\n" % util.ellipsis(inst.args[1]))
    except error.RevlogError, inst:
        ui.warn(_("abort: %s!\n") % inst)
    except error.SignalInterrupt:
        ui.warn(_("killed!\n"))
    except error.UnknownCommand, inst:
        ui.warn(_("hg: unknown command '%s'\n") % inst.args[0])
        try:
            # check if the command is in a disabled extension
            # (but don't check for extensions themselves)
            commands.help_(ui, inst.args[0], unknowncmd=True)
        except error.UnknownCommand:
            commands.help_(ui, 'shortlist')
    except error.InterventionRequired, inst:
        ui.warn("%s\n" % inst)
        return 1
    except util.Abort, inst:
        ui.warn(_("abort: %s\n") % inst)
        if inst.hint:
            ui.warn(_("(%s)\n") % inst.hint)
    except ImportError, inst:
        ui.warn(_("abort: %s!\n") % inst)
        m = str(inst).split()[-1]
        if m in "mpatch bdiff".split():
            ui.warn(_("(did you forget to compile extensions?)\n"))
        elif m in "zlib".split():
            ui.warn(_("(is your Python install correct?)\n"))
    except IOError, inst:
        if util.safehasattr(inst, "code"):
            ui.warn(_("abort: %s\n") % inst)
        elif util.safehasattr(inst, "reason"):
            try: # usually it is in the form (errno, strerror)
                reason = inst.reason.args[1]
            except (AttributeError, IndexError):
                # it might be anything, for example a string
                reason = inst.reason
            ui.warn(_("abort: error: %s\n") % reason)
        elif util.safehasattr(inst, "args") and inst.args[0] == errno.EPIPE:
            if ui.debugflag:
                ui.warn(_("broken pipe\n"))
        elif getattr(inst, "strerror", None):
            if getattr(inst, "filename", None):
                ui.warn(_("abort: %s: %s\n") % (inst.strerror, inst.filename))
            else:
                ui.warn(_("abort: %s\n") % inst.strerror)
        else:
            raise
    except OSError, inst:
        if getattr(inst, "filename", None) is not None:
            ui.warn(_("abort: %s: '%s'\n") % (inst.strerror, inst.filename))
        else:
            ui.warn(_("abort: %s\n") % inst.strerror)
    except KeyboardInterrupt:
        try:
            ui.warn(_("interrupted!\n"))
        except IOError, inst:
            if inst.errno == errno.EPIPE:
                if ui.debugflag:
                    ui.warn(_("\nbroken pipe\n"))
            else:
                raise
    except MemoryError:
        ui.warn(_("abort: out of memory\n"))
    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 socket.error, inst:
        ui.warn(_("abort: %s\n") % inst.args[-1])
    except: # re-raises
        myver = util.version()
        # For compatibility checking, we discard the portion of the hg
        # version after the + on the assumption that if a "normal
        # user" is running a build with a + in it the packager
        # probably built from fairly close to a tag and anyone with a
        # 'make local' copy of hg (where the version number can be out
        # of date) will be clueful enough to notice the implausible
        # version number and try updating.
        compare = myver.split('+')[0]
        ct = tuplever(compare)
        worst = None, ct, ''
        for name, mod in extensions.extensions():
            testedwith = getattr(mod, 'testedwith', '')
            report = getattr(mod, 'buglink', _('the extension author.'))
            if not testedwith.strip():
                # We found an untested extension. It's likely the culprit.
                worst = name, 'unknown', report
                break
            if compare not in testedwith.split() and testedwith != 'internal':
                tested = [tuplever(v) for v in testedwith.split()]
                lower = [t for t in tested if t < ct]
                nearest = max(lower or tested)
                if worst[0] is None or nearest < worst[1]:
                    worst = name, nearest, report
        if worst[0] is not None:
            name, testedwith, report = worst
            if not isinstance(testedwith, str):
                testedwith = '.'.join([str(c) for c in testedwith])
            warning = (_('** Unknown exception encountered with '
                         'possibly-broken third-party extension %s\n'
                         '** which supports versions %s of Mercurial.\n'
                         '** Please disable %s and try your action again.\n'
                         '** If that fixes the bug please report it to %s\n')
                       % (name, testedwith, name, report))
        else:
            warning = (_("** unknown exception encountered, "
                         "please report by visiting\n") +
                       _("** http://mercurial.selenic.com/wiki/BugTracker\n"))
        warning += ((_("** Python %s\n") % sys.version.replace('\n', '')) +
                    (_("** Mercurial Distributed SCM (version %s)\n") % myver) +
                    (_("** Extensions loaded: %s\n") %
                     ", ".join([x[0] for x in extensions.extensions()])))
        ui.log("commandexception", "%s\n%s\n", warning, traceback.format_exc())
        ui.warn(warning)
        raise

    return -1

def tuplever(v):
    try:
        return tuple([int(i) for i in v.split('.')])
    except ValueError:
        return tuple()

def aliasargs(fn, givenargs):
    args = getattr(fn, 'args', [])
    if args:
        cmd = ' '.join(map(util.shellquote, args))

        nums = []
        def replacer(m):
            num = int(m.group(1)) - 1
            nums.append(num)
            if num < len(givenargs):
                return givenargs[num]
            raise util.Abort(_('too few arguments for command alias'))
        cmd = re.sub(r'\$(\d+|\$)', replacer, cmd)
        givenargs = [x for i, x in enumerate(givenargs)
                     if i not in nums]
        args = shlex.split(cmd)
    return args + givenargs

class cmdalias(object):
    def __init__(self, name, definition, cmdtable):
        self.name = self.cmd = name
        self.cmdname = ''
        self.definition = definition
        self.args = []
        self.opts = []
        self.help = ''
        self.norepo = True
        self.optionalrepo = False
        self.badalias = False

        try:
            aliases, entry = cmdutil.findcmd(self.name, cmdtable)
            for alias, e in cmdtable.iteritems():
                if e is entry:
                    self.cmd = alias
                    break
            self.shadows = True
        except error.UnknownCommand:
            self.shadows = False

        if not self.definition:
            def fn(ui, *args):
                ui.warn(_("no definition for alias '%s'\n") % self.name)
                return 1
            self.fn = fn
            self.badalias = True
            return

        if self.definition.startswith('!'):
            self.shell = True
            def fn(ui, *args):
                env = {'HG_ARGS': ' '.join((self.name,) + args)}
                def _checkvar(m):
                    if m.groups()[0] == '$':
                        return m.group()
                    elif int(m.groups()[0]) <= len(args):
                        return m.group()
                    else:
                        ui.debug("No argument found for substitution "
                                 "of %i variable in alias '%s' definition."
                                 % (int(m.groups()[0]), self.name))
                        return ''
                cmd = re.sub(r'\$(\d+|\$)', _checkvar, self.definition[1:])
                replace = dict((str(i + 1), arg) for i, arg in enumerate(args))
                replace['0'] = self.name
                replace['@'] = ' '.join(args)
                cmd = util.interpolate(r'\$', replace, cmd, escape_prefix=True)
                return util.system(cmd, environ=env, out=ui.fout)
            self.fn = fn
            return

        args = shlex.split(self.definition)
        self.cmdname = cmd = args.pop(0)
        args = map(util.expandpath, args)

        for invalidarg in ("--cwd", "-R", "--repository", "--repo", "--config"):
            if _earlygetopt([invalidarg], args):
                def fn(ui, *args):
                    ui.warn(_("error in definition for alias '%s': %s may only "
                              "be given on the command line\n")
                            % (self.name, invalidarg))
                    return 1

                self.fn = fn
                self.badalias = True
                return

        try:
            tableentry = cmdutil.findcmd(cmd, cmdtable, False)[1]
            if len(tableentry) > 2:
                self.fn, self.opts, self.help = tableentry
            else:
                self.fn, self.opts = tableentry

            self.args = aliasargs(self.fn, args)
            if cmd not in commands.norepo.split(' '):
                self.norepo = False
            if cmd in commands.optionalrepo.split(' '):
                self.optionalrepo = True
            if self.help.startswith("hg " + cmd):
                # drop prefix in old-style help lines so hg shows the alias
                self.help = self.help[4 + len(cmd):]
            self.__doc__ = self.fn.__doc__

        except error.UnknownCommand:
            def fn(ui, *args):
                ui.warn(_("alias '%s' resolves to unknown command '%s'\n") \
                            % (self.name, cmd))
                try:
                    # check if the command is in a disabled extension
                    commands.help_(ui, cmd, unknowncmd=True)
                except error.UnknownCommand:
                    pass
                return 1
            self.fn = fn
            self.badalias = True
        except error.AmbiguousCommand:
            def fn(ui, *args):
                ui.warn(_("alias '%s' resolves to ambiguous command '%s'\n") \
                            % (self.name, cmd))
                return 1
            self.fn = fn
            self.badalias = True

    def __call__(self, ui, *args, **opts):
        if self.shadows:
            ui.debug("alias '%s' shadows command '%s'\n" %
                     (self.name, self.cmdname))

        if util.safehasattr(self, 'shell'):
            return self.fn(ui, *args, **opts)
        else:
            try:
                util.checksignature(self.fn)(ui, *args, **opts)
            except error.SignatureError:
                args = ' '.join([self.cmdname] + self.args)
                ui.debug("alias '%s' expands to '%s'\n" % (self.name, args))
                raise

def addaliases(ui, cmdtable):
    # aliases are processed after extensions have been loaded, so they
    # may use extension commands. Aliases can also use other alias definitions,
    # but only if they have been defined prior to the current definition.
    for alias, definition in ui.configitems('alias'):
        aliasdef = cmdalias(alias, definition, cmdtable)

        try:
            olddef = cmdtable[aliasdef.cmd][0]
            if olddef.definition == aliasdef.definition:
                continue
        except (KeyError, AttributeError):
            # definition might not exist or it might not be a cmdalias
            pass

        cmdtable[aliasdef.name] = (aliasdef, aliasdef.opts, aliasdef.help)
        if aliasdef.norepo:
            commands.norepo += ' %s' % alias
        if aliasdef.optionalrepo:
            commands.optionalrepo += ' %s' % alias

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

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

    if args:
        cmd, args = args[0], args[1:]
        aliases, entry = cmdutil.findcmd(cmd, commands.table,
                                         ui.configbool("ui", "strict"))
        cmd = aliases[0]
        args = aliasargs(entry[0], args)
        defaults = ui.config("defaults", cmd)
        if defaults:
            args = map(util.expandpath, shlex.split(defaults)) + args
        c = list(entry[1])
    else:
        cmd = None
        c = []

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

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

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

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

def _parseconfig(ui, config):
    """parse the --config options from the command line"""
    configs = []

    for cfg in config:
        try:
            name, value = cfg.split('=', 1)
            section, name = name.split('.', 1)
            if not section or not name:
                raise IndexError
            ui.setconfig(section, name, value)
            configs.append((section, name, value))
        except (IndexError, ValueError):
            raise util.Abort(_('malformed --config option: %r '
                               '(use --config section.name=value)') % cfg)

    return configs

def _earlygetopt(aliases, args):
    """Return list of values for an option (or aliases).

    The values are listed in the order they appear in args.
    The options and values are removed from args.

    >>> args = ['x', '--cwd', 'foo', 'y']
    >>> _earlygetopt(['--cwd'], args), args
    (['foo'], ['x', 'y'])

    >>> args = ['x', '--cwd=bar', 'y']
    >>> _earlygetopt(['--cwd'], args), args
    (['bar'], ['x', 'y'])

    >>> args = ['x', '-R', 'foo', 'y']
    >>> _earlygetopt(['-R'], args), args
    (['foo'], ['x', 'y'])

    >>> args = ['x', '-Rbar', 'y']
    >>> _earlygetopt(['-R'], args), args
    (['bar'], ['x', 'y'])
    """
    try:
        argcount = args.index("--")
    except ValueError:
        argcount = len(args)
    shortopts = [opt for opt in aliases if len(opt) == 2]
    values = []
    pos = 0
    while pos < argcount:
        fullarg = arg = args[pos]
        equals = arg.find('=')
        if equals > -1:
            arg = arg[:equals]
        if arg in aliases:
            del args[pos]
            if equals > -1:
                values.append(fullarg[equals + 1:])
                argcount -= 1
            else:
                if pos + 1 >= argcount:
                    # ignore and let getopt report an error if there is no value
                    break
                values.append(args.pop(pos))
                argcount -= 2
        elif arg[:2] in shortopts:
            # short option can have no following space, e.g. hg log -Rfoo
            values.append(args.pop(pos)[2:])
            argcount -= 1
        else:
            pos += 1
    return values

def runcommand(lui, repo, cmd, fullargs, ui, options, d, cmdpats, cmdoptions):
    # run pre-hook, and abort if it fails
    hook.hook(lui, repo, "pre-%s" % cmd, True, args=" ".join(fullargs),
              pats=cmdpats, opts=cmdoptions)
    ret = _runcommand(ui, options, cmd, d)
    # run post-hook, passing command result
    hook.hook(lui, repo, "post-%s" % cmd, False, args=" ".join(fullargs),
              result=ret, pats=cmdpats, opts=cmdoptions)
    return ret

def _getlocal(ui, rpath):
    """Return (path, local ui object) for the given target path.

    Takes paths in [cwd]/.hg/hgrc into account."
    """
    try:
        wd = os.getcwd()
    except OSError, e:
        raise util.Abort(_("error getting current working directory: %s") %
                         e.strerror)
    path = cmdutil.findrepo(wd) or ""
    if not path:
        lui = ui
    else:
        lui = ui.copy()
        lui.readconfig(os.path.join(path, ".hg", "hgrc"), path)

    if rpath and rpath[-1]:
        path = lui.expandpath(rpath[-1])
        lui = ui.copy()
        lui.readconfig(os.path.join(path, ".hg", "hgrc"), path)

    return path, lui

def _checkshellalias(lui, ui, args):
    options = {}

    try:
        args = fancyopts.fancyopts(args, commands.globalopts, options)
    except fancyopts.getopt.GetoptError:
        return

    if not args:
        return

    norepo = commands.norepo
    optionalrepo = commands.optionalrepo
    def restorecommands():
        commands.norepo = norepo
        commands.optionalrepo = optionalrepo

    cmdtable = commands.table.copy()
    addaliases(lui, cmdtable)

    cmd = args[0]
    try:
        aliases, entry = cmdutil.findcmd(cmd, cmdtable,
                                         lui.configbool("ui", "strict"))
    except (error.AmbiguousCommand, error.UnknownCommand):
        restorecommands()
        return

    cmd = aliases[0]
    fn = entry[0]

    if cmd and util.safehasattr(fn, 'shell'):
        d = lambda: fn(ui, *args[1:])
        return lambda: runcommand(lui, None, cmd, args[:1], ui, options, d,
                                  [], {})

    restorecommands()

_loaded = set()
def _dispatch(req):
    args = req.args
    ui = req.ui

    # read --config before doing anything else
    # (e.g. to change trust settings for reading .hg/hgrc)
    cfgs = _parseconfig(ui, _earlygetopt(['--config'], args))

    # check for cwd
    cwd = _earlygetopt(['--cwd'], args)
    if cwd:
        os.chdir(cwd[-1])

    rpath = _earlygetopt(["-R", "--repository", "--repo"], args)
    path, lui = _getlocal(ui, rpath)

    # Now that we're operating in the right directory/repository with
    # the right config settings, check for shell aliases
    shellaliasfn = _checkshellalias(lui, ui, args)
    if shellaliasfn:
        return shellaliasfn()

    # Configure extensions in phases: uisetup, extsetup, cmdtable, and
    # reposetup. Programs like TortoiseHg will call _dispatch several
    # times so we keep track of configured extensions in _loaded.
    extensions.loadall(lui)
    exts = [ext for ext in extensions.extensions() if ext[0] not in _loaded]
    # Propagate any changes to lui.__class__ by extensions
    ui.__class__ = lui.__class__

    # (uisetup and extsetup are handled in extensions.loadall)

    for name, module in exts:
        cmdtable = getattr(module, 'cmdtable', {})
        overrides = [cmd for cmd in cmdtable if cmd in commands.table]
        if overrides:
            ui.warn(_("extension '%s' overrides commands: %s\n")
                    % (name, " ".join(overrides)))
        commands.table.update(cmdtable)
        _loaded.add(name)

    # (reposetup is handled in hg.repository)

    addaliases(lui, commands.table)

    # check for fallback encoding
    fallback = lui.config('ui', 'fallbackencoding')
    if fallback:
        encoding.fallbackencoding = fallback

    fullargs = args
    cmd, func, args, options, cmdoptions = _parse(lui, args)

    if options["config"]:
        raise util.Abort(_("option --config may not be abbreviated!"))
    if options["cwd"]:
        raise util.Abort(_("option --cwd may not be abbreviated!"))
    if options["repository"]:
        raise util.Abort(_(
            "option -R has to be separated from other options (e.g. not -qR) "
            "and --repository may only be abbreviated as --repo!"))

    if options["encoding"]:
        encoding.encoding = options["encoding"]
    if options["encodingmode"]:
        encoding.encodingmode = options["encodingmode"]
    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()
            ui.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)

    uis = set([ui, lui])

    if req.repo:
        uis.add(req.repo.ui)

        # copy configs that were passed on the cmdline (--config) to the repo ui
        for cfg in cfgs:
            req.repo.ui.setconfig(*cfg)

    if options['verbose'] or options['debug'] or options['quiet']:
        for opt in ('verbose', 'debug', 'quiet'):
            val = str(bool(options[opt]))
            for ui_ in uis:
                ui_.setconfig('ui', opt, val)

    if options['traceback']:
        for ui_ in uis:
            ui_.setconfig('ui', 'traceback', 'on')

    if options['noninteractive']:
        for ui_ in uis:
            ui_.setconfig('ui', 'interactive', 'off')

    if cmdoptions.get('insecure', False):
        for ui_ in uis:
            ui_.setconfig('web', 'cacerts', '')

    if options['version']:
        return commands.version_(ui)
    if options['help']:
        return commands.help_(ui, cmd)
    elif not cmd:
        return commands.help_(ui, 'shortlist')

    repo = None
    cmdpats = args[:]
    if cmd not in commands.norepo.split():
        # use the repo from the request only if we don't have -R
        if not rpath and not cwd:
            repo = req.repo

        if repo:
            # set the descriptors of the repo ui to those of ui
            repo.ui.fin = ui.fin
            repo.ui.fout = ui.fout
            repo.ui.ferr = ui.ferr
        else:
            try:
                repo = hg.repository(ui, path=path)
                if not repo.local():
                    raise util.Abort(_("repository '%s' is not local") % path)
                if options['hidden']:
                    repo = repo.unfiltered()
                repo.ui.setconfig("bundle", "mainreporoot", repo.root)
            except error.RequirementError:
                raise
            except error.RepoError:
                if cmd not in commands.optionalrepo.split():
                    if (cmd in commands.inferrepo.split() and
                        args and not path): # try to infer -R from command args
                        repos = map(cmdutil.findrepo, args)
                        guess = repos[0]
                        if guess and repos.count(guess) == len(repos):
                            req.args = ['--repository', guess] + fullargs
                            return _dispatch(req)
                    if not path:
                        raise error.RepoError(_("no repository found in '%s'"
                                                " (.hg not found)")
                                              % os.getcwd())
                    raise
        if repo:
            ui = repo.ui
        args.insert(0, repo)
    elif rpath:
        ui.warn(_("warning: --repository ignored\n"))

    msg = ' '.join(' ' in a and repr(a) or a for a in fullargs)
    ui.log("command", '%s\n', msg)
    d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
    try:
        return runcommand(lui, repo, cmd, fullargs, ui, options, d,
                          cmdpats, cmdoptions)
    finally:
        if repo and repo != req.repo:
            repo.close()

def lsprofile(ui, func, fp):
    format = ui.config('profiling', 'format', default='text')
    field = ui.config('profiling', 'sort', default='inlinetime')
    limit = ui.configint('profiling', 'limit', default=30)
    climit = ui.configint('profiling', 'nested', default=5)

    if format not in ['text', 'kcachegrind']:
        ui.warn(_("unrecognized profiling format '%s'"
                    " - Ignored\n") % format)
        format = 'text'

    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 func()
    finally:
        p.disable()

        if format == 'kcachegrind':
            import lsprofcalltree
            calltree = lsprofcalltree.KCacheGrind(p)
            calltree.output(fp)
        else:
            # format == 'text'
            stats = lsprof.Stats(p.getstats())
            stats.sort(field)
            stats.pprint(limit=limit, file=fp, climit=climit)

def statprofile(ui, func, fp):
    try:
        import statprof
    except ImportError:
        raise util.Abort(_(
            'statprof not available - install using "easy_install statprof"'))

    freq = ui.configint('profiling', 'freq', default=1000)
    if freq > 0:
        statprof.reset(freq)
    else:
        ui.warn(_("invalid sampling frequency '%s' - ignoring\n") % freq)

    statprof.start()
    try:
        return func()
    finally:
        statprof.stop()
        statprof.display(fp)

def _runcommand(ui, options, cmd, cmdfunc):
    def checkargs():
        try:
            return cmdfunc()
        except error.SignatureError:
            raise error.CommandError(cmd, _("invalid arguments"))

    if options['profile']:
        profiler = os.getenv('HGPROF')
        if profiler is None:
            profiler = ui.config('profiling', 'type', default='ls')
        if profiler not in ('ls', 'stat'):
            ui.warn(_("unrecognized profiler '%s' - ignored\n") % profiler)
            profiler = 'ls'

        output = ui.config('profiling', 'output')

        if output:
            path = ui.expandpath(output)
            fp = open(path, 'wb')
        else:
            fp = sys.stderr

        try:
            if profiler == 'ls':
                return lsprofile(ui, checkargs, fp)
            else:
                return statprofile(ui, checkargs, fp)
        finally:
            if output:
                fp.close()
    else:
        return checkargs()