hgext/mq.py

Merge qprev/qnext backout

# mq.py - patch queues for mercurial
#
# Copyright 2005, 2006 Chris Mason <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.

'''manage a stack of patches

This extension lets you work with a stack of patches in a Mercurial
repository. It manages two stacks of patches - all known patches, and
applied patches (subset of known patches).

Known patches are represented as patch files in the .hg/patches
directory. Applied patches are both patch files and changesets.

Common tasks (use "hg help command" for more details)::

  prepare repository to work with patches   qinit
  create new patch                          qnew
  import existing patch                     qimport

  print patch series                        qseries
  print applied patches                     qapplied

  add known patch to applied stack          qpush
  remove patch from applied stack           qpop
  refresh contents of top applied patch     qrefresh
'''

from mercurial.i18n import _
from mercurial.node import bin, hex, short, nullid, nullrev
from mercurial.lock import release
from mercurial import commands, cmdutil, hg, patch, util
from mercurial import repair, extensions, url, error
import os, sys, re, errno

commands.norepo += " qclone"

# Patch names looks like unix-file names.
# They must be joinable with queue directory and result in the patch path.
normname = util.normpath

class statusentry(object):
    def __init__(self, rev, name=None):
        if not name:
            fields = rev.split(':', 1)
            if len(fields) == 2:
                self.rev, self.name = fields
            else:
                self.rev, self.name = None, None
        else:
            self.rev, self.name = rev, name

    def __str__(self):
        return self.rev + ':' + self.name

class patchheader(object):
    def __init__(self, pf):
        def eatdiff(lines):
            while lines:
                l = lines[-1]
                if (l.startswith("diff -") or
                    l.startswith("Index:") or
                    l.startswith("===========")):
                    del lines[-1]
                else:
                    break
        def eatempty(lines):
            while lines:
                l = lines[-1]
                if re.match('\s*$', l):
                    del lines[-1]
                else:
                    break

        message = []
        comments = []
        user = None
        date = None
        format = None
        subject = None
        diffstart = 0

        for line in file(pf):
            line = line.rstrip()
            if line.startswith('diff --git'):
                diffstart = 2
                break
            if diffstart:
                if line.startswith('+++ '):
                    diffstart = 2
                break
            if line.startswith("--- "):
                diffstart = 1
                continue
            elif format == "hgpatch":
                # parse values when importing the result of an hg export
                if line.startswith("# User "):
                    user = line[7:]
                elif line.startswith("# Date "):
                    date = line[7:]
                elif not line.startswith("# ") and line:
                    message.append(line)
                    format = None
            elif line == '# HG changeset patch':
                message = []
                format = "hgpatch"
            elif (format != "tagdone" and (line.startswith("Subject: ") or
                                           line.startswith("subject: "))):
                subject = line[9:]
                format = "tag"
            elif (format != "tagdone" and (line.startswith("From: ") or
                                           line.startswith("from: "))):
                user = line[6:]
                format = "tag"
            elif format == "tag" and line == "":
                # when looking for tags (subject: from: etc) they
                # end once you find a blank line in the source
                format = "tagdone"
            elif message or line:
                message.append(line)
            comments.append(line)

        eatdiff(message)
        eatdiff(comments)
        eatempty(message)
        eatempty(comments)

        # make sure message isn't empty
        if format and format.startswith("tag") and subject:
            message.insert(0, "")
            message.insert(0, subject)

        self.message = message
        self.comments = comments
        self.user = user
        self.date = date
        self.haspatch = diffstart > 1

    def setuser(self, user):
        if not self.updateheader(['From: ', '# User '], user):
            try:
                patchheaderat = self.comments.index('# HG changeset patch')
                self.comments.insert(patchheaderat + 1, '# User ' + user)
            except ValueError:
                if self._hasheader(['Date: ']):
                    self.comments = ['From: ' + user] + self.comments
                else:
                    tmp = ['# HG changeset patch', '# User ' + user, '']
                    self.comments = tmp + self.comments
        self.user = user

    def setdate(self, date):
        if not self.updateheader(['Date: ', '# Date '], date):
            try:
                patchheaderat = self.comments.index('# HG changeset patch')
                self.comments.insert(patchheaderat + 1, '# Date ' + date)
            except ValueError:
                if self._hasheader(['From: ']):
                    self.comments = ['Date: ' + date] + self.comments
                else:
                    tmp = ['# HG changeset patch', '# Date ' + date, '']
                    self.comments = tmp + self.comments
        self.date = date

    def setmessage(self, message):
        if self.comments:
            self._delmsg()
        self.message = [message]
        self.comments += self.message

    def updateheader(self, prefixes, new):
        '''Update all references to a field in the patch header.
        Return whether the field is present.'''
        res = False
        for prefix in prefixes:
            for i in xrange(len(self.comments)):
                if self.comments[i].startswith(prefix):
                    self.comments[i] = prefix + new
                    res = True
                    break
        return res

    def _hasheader(self, prefixes):
        '''Check if a header starts with any of the given prefixes.'''
        for prefix in prefixes:
            for comment in self.comments:
                if comment.startswith(prefix):
                    return True
        return False

    def __str__(self):
        if not self.comments:
            return ''
        return '\n'.join(self.comments) + '\n\n'

    def _delmsg(self):
        '''Remove existing message, keeping the rest of the comments fields.
        If comments contains 'subject: ', message will prepend
        the field and a blank line.'''
        if self.message:
            subj = 'subject: ' + self.message[0].lower()
            for i in xrange(len(self.comments)):
                if subj == self.comments[i].lower():
                    del self.comments[i]
                    self.message = self.message[2:]
                    break
        ci = 0
        for mi in self.message:
            while mi != self.comments[ci]:
                ci += 1
            del self.comments[ci]

class queue(object):
    def __init__(self, ui, path, patchdir=None):
        self.basepath = path
        self.path = patchdir or os.path.join(path, "patches")
        self.opener = util.opener(self.path)
        self.ui = ui
        self.applied_dirty = 0
        self.series_dirty = 0
        self.series_path = "series"
        self.status_path = "status"
        self.guards_path = "guards"
        self.active_guards = None
        self.guards_dirty = False
        self._diffopts = None

    @util.propertycache
    def applied(self):
        if os.path.exists(self.join(self.status_path)):
            lines = self.opener(self.status_path).read().splitlines()
            return [statusentry(l) for l in lines]
        return []

    @util.propertycache
    def full_series(self):
        if os.path.exists(self.join(self.series_path)):
            return self.opener(self.series_path).read().splitlines()
        return []

    @util.propertycache
    def series(self):
        self.parse_series()
        return self.series

    @util.propertycache
    def series_guards(self):
        self.parse_series()
        return self.series_guards

    def invalidate(self):
        for a in 'applied full_series series series_guards'.split():
            if a in self.__dict__:
                delattr(self, a)
        self.applied_dirty = 0
        self.series_dirty = 0
        self.guards_dirty = False
        self.active_guards = None

    def diffopts(self):
        if self._diffopts is None:
            self._diffopts = patch.diffopts(self.ui)
        return self._diffopts

    def join(self, *p):
        return os.path.join(self.path, *p)

    def find_series(self, patch):
        pre = re.compile("(\s*)([^#]+)")
        index = 0
        for l in self.full_series:
            m = pre.match(l)
            if m:
                s = m.group(2)
                s = s.rstrip()
                if s == patch:
                    return index
            index += 1
        return None

    guard_re = re.compile(r'\s?#([-+][^-+# \t\r\n\f][^# \t\r\n\f]*)')

    def parse_series(self):
        self.series = []
        self.series_guards = []
        for l in self.full_series:
            h = l.find('#')
            if h == -1:
                patch = l
                comment = ''
            elif h == 0:
                continue
            else:
                patch = l[:h]
                comment = l[h:]
            patch = patch.strip()
            if patch:
                if patch in self.series:
                    raise util.Abort(_('%s appears more than once in %s') %
                                     (patch, self.join(self.series_path)))
                self.series.append(patch)
                self.series_guards.append(self.guard_re.findall(comment))

    def check_guard(self, guard):
        if not guard:
            return _('guard cannot be an empty string')
        bad_chars = '# \t\r\n\f'
        first = guard[0]
        if first in '-+':
            return (_('guard %r starts with invalid character: %r') %
                      (guard, first))
        for c in bad_chars:
            if c in guard:
                return _('invalid character in guard %r: %r') % (guard, c)

    def set_active(self, guards):
        for guard in guards:
            bad = self.check_guard(guard)
            if bad:
                raise util.Abort(bad)
        guards = sorted(set(guards))
        self.ui.debug(_('active guards: %s\n') % ' '.join(guards))
        self.active_guards = guards
        self.guards_dirty = True

    def active(self):
        if self.active_guards is None:
            self.active_guards = []
            try:
                guards = self.opener(self.guards_path).read().split()
            except IOError, err:
                if err.errno != errno.ENOENT: raise
                guards = []
            for i, guard in enumerate(guards):
                bad = self.check_guard(guard)
                if bad:
                    self.ui.warn('%s:%d: %s\n' %
                                 (self.join(self.guards_path), i + 1, bad))
                else:
                    self.active_guards.append(guard)
        return self.active_guards

    def set_guards(self, idx, guards):
        for g in guards:
            if len(g) < 2:
                raise util.Abort(_('guard %r too short') % g)
            if g[0] not in '-+':
                raise util.Abort(_('guard %r starts with invalid char') % g)
            bad = self.check_guard(g[1:])
            if bad:
                raise util.Abort(bad)
        drop = self.guard_re.sub('', self.full_series[idx])
        self.full_series[idx] = drop + ''.join([' #' + g for g in guards])
        self.parse_series()
        self.series_dirty = True

    def pushable(self, idx):
        if isinstance(idx, str):
            idx = self.series.index(idx)
        patchguards = self.series_guards[idx]
        if not patchguards:
            return True, None
        guards = self.active()
        exactneg = [g for g in patchguards if g[0] == '-' and g[1:] in guards]
        if exactneg:
            return False, exactneg[0]
        pos = [g for g in patchguards if g[0] == '+']
        exactpos = [g for g in pos if g[1:] in guards]
        if pos:
            if exactpos:
                return True, exactpos[0]
            return False, pos
        return True, ''

    def explain_pushable(self, idx, all_patches=False):
        write = all_patches and self.ui.write or self.ui.warn
        if all_patches or self.ui.verbose:
            if isinstance(idx, str):
                idx = self.series.index(idx)
            pushable, why = self.pushable(idx)
            if all_patches and pushable:
                if why is None:
                    write(_('allowing %s - no guards in effect\n') %
                          self.series[idx])
                else:
                    if not why:
                        write(_('allowing %s - no matching negative guards\n') %
                              self.series[idx])
                    else:
                        write(_('allowing %s - guarded by %r\n') %
                              (self.series[idx], why))
            if not pushable:
                if why:
                    write(_('skipping %s - guarded by %r\n') %
                          (self.series[idx], why))
                else:
                    write(_('skipping %s - no matching guards\n') %
                          self.series[idx])

    def save_dirty(self):
        def write_list(items, path):
            fp = self.opener(path, 'w')
            for i in items:
                fp.write("%s\n" % i)
            fp.close()
        if self.applied_dirty: write_list(map(str, self.applied), self.status_path)
        if self.series_dirty: write_list(self.full_series, self.series_path)
        if self.guards_dirty: write_list(self.active_guards, self.guards_path)

    def removeundo(self, repo):
        undo = repo.sjoin('undo')
        if not os.path.exists(undo):
            return
        try:
            os.unlink(undo)
        except OSError, inst:
            self.ui.warn(_('error removing undo: %s\n') % str(inst))

    def printdiff(self, repo, node1, node2=None, files=None,
                  fp=None, changes=None, opts={}):
        m = cmdutil.match(repo, files, opts)
        chunks = patch.diff(repo, node1, node2, m, changes, self.diffopts())
        write = fp is None and repo.ui.write or fp.write
        for chunk in chunks:
            write(chunk)

    def mergeone(self, repo, mergeq, head, patch, rev):
        # first try just applying the patch
        (err, n) = self.apply(repo, [ patch ], update_status=False,
                              strict=True, merge=rev)

        if err == 0:
            return (err, n)

        if n is None:
            raise util.Abort(_("apply failed for patch %s") % patch)

        self.ui.warn(_("patch didn't work out, merging %s\n") % patch)

        # apply failed, strip away that rev and merge.
        hg.clean(repo, head)
        self.strip(repo, n, update=False, backup='strip')

        ctx = repo[rev]
        ret = hg.merge(repo, rev)
        if ret:
            raise util.Abort(_("update returned %d") % ret)
        n = repo.commit(ctx.description(), ctx.user(), force=True)
        if n is None:
            raise util.Abort(_("repo commit failed"))
        try:
            ph = patchheader(mergeq.join(patch))
        except:
            raise util.Abort(_("unable to read %s") % patch)

        patchf = self.opener(patch, "w")
        comments = str(ph)
        if comments:
            patchf.write(comments)
        self.printdiff(repo, head, n, fp=patchf)
        patchf.close()
        self.removeundo(repo)
        return (0, n)

    def qparents(self, repo, rev=None):
        if rev is None:
            (p1, p2) = repo.dirstate.parents()
            if p2 == nullid:
                return p1
            if len(self.applied) == 0:
                return None
            return bin(self.applied[-1].rev)
        pp = repo.changelog.parents(rev)
        if pp[1] != nullid:
            arevs = [ x.rev for x in self.applied ]
            p0 = hex(pp[0])
            p1 = hex(pp[1])
            if p0 in arevs:
                return pp[0]
            if p1 in arevs:
                return pp[1]
        return pp[0]

    def mergepatch(self, repo, mergeq, series):
        if len(self.applied) == 0:
            # each of the patches merged in will have two parents.  This
            # can confuse the qrefresh, qdiff, and strip code because it
            # needs to know which parent is actually in the patch queue.
            # so, we insert a merge marker with only one parent.  This way
            # the first patch in the queue is never a merge patch
            #
            pname = ".hg.patches.merge.marker"
            n = repo.commit('[mq]: merge marker', force=True)
            self.removeundo(repo)
            self.applied.append(statusentry(hex(n), pname))
            self.applied_dirty = 1

        head = self.qparents(repo)

        for patch in series:
            patch = mergeq.lookup(patch, strict=True)
            if not patch:
                self.ui.warn(_("patch %s does not exist\n") % patch)
                return (1, None)
            pushable, reason = self.pushable(patch)
            if not pushable:
                self.explain_pushable(patch, all_patches=True)
                continue
            info = mergeq.isapplied(patch)
            if not info:
                self.ui.warn(_("patch %s is not applied\n") % patch)
                return (1, None)
            rev = bin(info[1])
            (err, head) = self.mergeone(repo, mergeq, head, patch, rev)
            if head:
                self.applied.append(statusentry(hex(head), patch))
                self.applied_dirty = 1
            if err:
                return (err, head)
        self.save_dirty()
        return (0, head)

    def patch(self, repo, patchfile):
        '''Apply patchfile  to the working directory.
        patchfile: name of patch file'''
        files = {}
        try:
            fuzz = patch.patch(patchfile, self.ui, strip=1, cwd=repo.root,
                               files=files, eolmode=None)
        except Exception, inst:
            self.ui.note(str(inst) + '\n')
            if not self.ui.verbose:
                self.ui.warn(_("patch failed, unable to continue (try -v)\n"))
            return (False, files, False)

        return (True, files, fuzz)

    def apply(self, repo, series, list=False, update_status=True,
              strict=False, patchdir=None, merge=None, all_files={}):
        wlock = lock = tr = None
        try:
            wlock = repo.wlock()
            lock = repo.lock()
            tr = repo.transaction()
            try:
                ret = self._apply(repo, series, list, update_status,
                                  strict, patchdir, merge, all_files=all_files)
                tr.close()
                self.save_dirty()
                return ret
            except:
                try:
                    tr.abort()
                finally:
                    repo.invalidate()
                    repo.dirstate.invalidate()
                raise
        finally:
            del tr
            release(lock, wlock)
            self.removeundo(repo)

    def _apply(self, repo, series, list=False, update_status=True,
               strict=False, patchdir=None, merge=None, all_files={}):
        '''returns (error, hash)
        error = 1 for unable to read, 2 for patch failed, 3 for patch fuzz'''
        # TODO unify with commands.py
        if not patchdir:
            patchdir = self.path
        err = 0
        n = None
        for patchname in series:
            pushable, reason = self.pushable(patchname)
            if not pushable:
                self.explain_pushable(patchname, all_patches=True)
                continue
            self.ui.status(_("applying %s\n") % patchname)
            pf = os.path.join(patchdir, patchname)

            try:
                ph = patchheader(self.join(patchname))
            except:
                self.ui.warn(_("unable to read %s\n") % patchname)
                err = 1
                break

            message = ph.message
            if not message:
                message = _("imported patch %s\n") % patchname
            else:
                if list:
                    message.append(_("\nimported patch %s") % patchname)
                message = '\n'.join(message)

            if ph.haspatch:
                (patcherr, files, fuzz) = self.patch(repo, pf)
                all_files.update(files)
                patcherr = not patcherr
            else:
                self.ui.warn(_("patch %s is empty\n") % patchname)
                patcherr, files, fuzz = 0, [], 0

            if merge and files:
                # Mark as removed/merged and update dirstate parent info
                removed = []
                merged = []
                for f in files:
                    if os.path.exists(repo.wjoin(f)):
                        merged.append(f)
                    else:
                        removed.append(f)
                for f in removed:
                    repo.dirstate.remove(f)
                for f in merged:
                    repo.dirstate.merge(f)
                p1, p2 = repo.dirstate.parents()
                repo.dirstate.setparents(p1, merge)

            files = patch.updatedir(self.ui, repo, files)
            match = cmdutil.matchfiles(repo, files or [])
            n = repo.commit(message, ph.user, ph.date, match=match, force=True)

            if n is None:
                raise util.Abort(_("repo commit failed"))

            if update_status:
                self.applied.append(statusentry(hex(n), patchname))

            if patcherr:
                self.ui.warn(_("patch failed, rejects left in working dir\n"))
                err = 2
                break

            if fuzz and strict:
                self.ui.warn(_("fuzz found when applying patch, stopping\n"))
                err = 3
                break
        return (err, n)

    def _cleanup(self, patches, numrevs, keep=False):
        if not keep:
            r = self.qrepo()
            if r:
                r.remove(patches, True)
            else:
                for p in patches:
                    os.unlink(self.join(p))

        if numrevs:
            del self.applied[:numrevs]
            self.applied_dirty = 1

        for i in sorted([self.find_series(p) for p in patches], reverse=True):
            del self.full_series[i]
        self.parse_series()
        self.series_dirty = 1

    def _revpatches(self, repo, revs):
        firstrev = repo[self.applied[0].rev].rev()
        patches = []
        for i, rev in enumerate(revs):

            if rev < firstrev:
                raise util.Abort(_('revision %d is not managed') % rev)

            ctx = repo[rev]
            base = bin(self.applied[i].rev)
            if ctx.node() != base:
                msg = _('cannot delete revision %d above applied patches')
                raise util.Abort(msg % rev)

            patch = self.applied[i].name
            for fmt in ('[mq]: %s', 'imported patch %s'):
                if ctx.description() == fmt % patch:
                    msg = _('patch %s finalized without changeset message\n')
                    repo.ui.status(msg % patch)
                    break

            patches.append(patch)
        return patches

    def finish(self, repo, revs):
        patches = self._revpatches(repo, sorted(revs))
        self._cleanup(patches, len(patches))

    def delete(self, repo, patches, opts):
        if not patches and not opts.get('rev'):
            raise util.Abort(_('qdelete requires at least one revision or '
                               'patch name'))

        realpatches = []
        for patch in patches:
            patch = self.lookup(patch, strict=True)
            info = self.isapplied(patch)
            if info:
                raise util.Abort(_("cannot delete applied patch %s") % patch)
            if patch not in self.series:
                raise util.Abort(_("patch %s not in series file") % patch)
            realpatches.append(patch)

        numrevs = 0
        if opts.get('rev'):
            if not self.applied:
                raise util.Abort(_('no patches applied'))
            revs = cmdutil.revrange(repo, opts['rev'])
            if len(revs) > 1 and revs[0] > revs[1]:
                revs.reverse()
            revpatches = self._revpatches(repo, revs)
            realpatches += revpatches
            numrevs = len(revpatches)

        self._cleanup(realpatches, numrevs, opts.get('keep'))

    def check_toppatch(self, repo):
        if len(self.applied) > 0:
            top = bin(self.applied[-1].rev)
            pp = repo.dirstate.parents()
            if top not in pp:
                raise util.Abort(_("working directory revision is not qtip"))
            return top
        return None
    def check_localchanges(self, repo, force=False, refresh=True):
        m, a, r, d = repo.status()[:4]
        if m or a or r or d:
            if not force:
                if refresh:
                    raise util.Abort(_("local changes found, refresh first"))
                else:
                    raise util.Abort(_("local changes found"))
        return m, a, r, d

    _reserved = ('series', 'status', 'guards')
    def check_reserved_name(self, name):
        if (name in self._reserved or name.startswith('.hg')
            or name.startswith('.mq')):
            raise util.Abort(_('"%s" cannot be used as the name of a patch')
                             % name)

    def new(self, repo, patchfn, *pats, **opts):
        """options:
           msg: a string or a no-argument function returning a string
        """
        msg = opts.get('msg')
        force = opts.get('force')
        user = opts.get('user')
        date = opts.get('date')
        if date:
            date = util.parsedate(date)
        self.check_reserved_name(patchfn)
        if os.path.exists(self.join(patchfn)):
            raise util.Abort(_('patch "%s" already exists') % patchfn)
        if opts.get('include') or opts.get('exclude') or pats:
            match = cmdutil.match(repo, pats, opts)
            # detect missing files in pats
            def badfn(f, msg):
                raise util.Abort('%s: %s' % (f, msg))
            match.bad = badfn
            m, a, r, d = repo.status(match=match)[:4]
        else:
            m, a, r, d = self.check_localchanges(repo, force)
            match = cmdutil.matchfiles(repo, m + a + r)
        commitfiles = m + a + r
        self.check_toppatch(repo)
        insert = self.full_series_end()
        wlock = repo.wlock()
        try:
            # if patch file write fails, abort early
            p = self.opener(patchfn, "w")
            try:
                if date:
                    p.write("# HG changeset patch\n")
                    if user:
                        p.write("# User " + user + "\n")
                    p.write("# Date %d %d\n\n" % date)
                elif user:
                    p.write("From: " + user + "\n\n")

                if hasattr(msg, '__call__'):
                    msg = msg()
                commitmsg = msg and msg or ("[mq]: %s" % patchfn)
                n = repo.commit(commitmsg, user, date, match=match, force=True)
                if n is None:
                    raise util.Abort(_("repo commit failed"))
                try:
                    self.full_series[insert:insert] = [patchfn]
                    self.applied.append(statusentry(hex(n), patchfn))
                    self.parse_series()
                    self.series_dirty = 1
                    self.applied_dirty = 1
                    if msg:
                        msg = msg + "\n\n"
                        p.write(msg)
                    if commitfiles:
                        diffopts = self.diffopts()
                        if opts.get('git'): diffopts.git = True
                        parent = self.qparents(repo, n)
                        chunks = patch.diff(repo, node1=parent, node2=n,
                                            match=match, opts=diffopts)
                        for chunk in chunks:
                            p.write(chunk)
                    p.close()
                    wlock.release()
                    wlock = None
                    r = self.qrepo()
                    if r: r.add([patchfn])
                except:
                    repo.rollback()
                    raise
            except Exception:
                patchpath = self.join(patchfn)
                try:
                    os.unlink(patchpath)
                except:
                    self.ui.warn(_('error unlinking %s\n') % patchpath)
                raise
            self.removeundo(repo)
        finally:
            release(wlock)

    def strip(self, repo, rev, update=True, backup="all", force=None):
        wlock = lock = None
        try:
            wlock = repo.wlock()
            lock = repo.lock()

            if update:
                self.check_localchanges(repo, force=force, refresh=False)
                urev = self.qparents(repo, rev)
                hg.clean(repo, urev)
                repo.dirstate.write()

            self.removeundo(repo)
            repair.strip(self.ui, repo, rev, backup)
            # strip may have unbundled a set of backed up revisions after
            # the actual strip
            self.removeundo(repo)
        finally:
            release(lock, wlock)

    def isapplied(self, patch):
        """returns (index, rev, patch)"""
        for i, a in enumerate(self.applied):
            if a.name == patch:
                return (i, a.rev, a.name)
        return None

    # if the exact patch name does not exist, we try a few
    # variations.  If strict is passed, we try only #1
    #
    # 1) a number to indicate an offset in the series file
    # 2) a unique substring of the patch name was given
    # 3) patchname[-+]num to indicate an offset in the series file
    def lookup(self, patch, strict=False):
        patch = patch and str(patch)

        def partial_name(s):
            if s in self.series:
                return s
            matches = [x for x in self.series if s in x]
            if len(matches) > 1:
                self.ui.warn(_('patch name "%s" is ambiguous:\n') % s)
                for m in matches:
                    self.ui.warn('  %s\n' % m)
                return None
            if matches:
                return matches[0]
            if len(self.series) > 0 and len(self.applied) > 0:
                if s == 'qtip':
                    return self.series[self.series_end(True)-1]
                if s == 'qbase':
                    return self.series[0]
            return None

        if patch is None:
            return None
        if patch in self.series:
            return patch

        if not os.path.isfile(self.join(patch)):
            try:
                sno = int(patch)
            except(ValueError, OverflowError):
                pass
            else:
                if -len(self.series) <= sno < len(self.series):
                    return self.series[sno]

            if not strict:
                res = partial_name(patch)
                if res:
                    return res
                minus = patch.rfind('-')
                if minus >= 0:
                    res = partial_name(patch[:minus])
                    if res:
                        i = self.series.index(res)
                        try:
                            off = int(patch[minus+1:] or 1)
                        except(ValueError, OverflowError):
                            pass
                        else:
                            if i - off >= 0:
                                return self.series[i - off]
                plus = patch.rfind('+')
                if plus >= 0:
                    res = partial_name(patch[:plus])
                    if res:
                        i = self.series.index(res)
                        try:
                            off = int(patch[plus+1:] or 1)
                        except(ValueError, OverflowError):
                            pass
                        else:
                            if i + off < len(self.series):
                                return self.series[i + off]
        raise util.Abort(_("patch %s not in series") % patch)

    def push(self, repo, patch=None, force=False, list=False,
             mergeq=None, all=False):
        wlock = repo.wlock()
        try:
            if repo.dirstate.parents()[0] not in repo.heads():
                self.ui.status(_("(working directory not at a head)\n"))

            if not self.series:
                self.ui.warn(_('no patches in series\n'))
                return 0

            patch = self.lookup(patch)
            # Suppose our series file is: A B C and the current 'top'
            # patch is B. qpush C should be performed (moving forward)
            # qpush B is a NOP (no change) qpush A is an error (can't
            # go backwards with qpush)
            if patch:
                info = self.isapplied(patch)
                if info:
                    if info[0] < len(self.applied) - 1:
                        raise util.Abort(
                            _("cannot push to a previous patch: %s") % patch)
                    self.ui.warn(
                        _('qpush: %s is already at the top\n') % patch)
                    return
                pushable, reason = self.pushable(patch)
                if not pushable:
                    if reason:
                        reason = _('guarded by %r') % reason
                    else:
                        reason = _('no matching guards')
                    self.ui.warn(_("cannot push '%s' - %s\n") % (patch, reason))
                    return 1
            elif all:
                patch = self.series[-1]
                if self.isapplied(patch):
                    self.ui.warn(_('all patches are currently applied\n'))
                    return 0

            # Following the above example, starting at 'top' of B:
            # qpush should be performed (pushes C), but a subsequent
            # qpush without an argument is an error (nothing to
            # apply). This allows a loop of "...while hg qpush..." to
            # work as it detects an error when done
            start = self.series_end()
            if start == len(self.series):
                self.ui.warn(_('patch series already fully applied\n'))
                return 1
            if not force:
                self.check_localchanges(repo)

            self.applied_dirty = 1
            if start > 0:
                self.check_toppatch(repo)
            if not patch:
                patch = self.series[start]
                end = start + 1
            else:
                end = self.series.index(patch, start) + 1

            s = self.series[start:end]
            all_files = {}
            try:
                if mergeq:
                    ret = self.mergepatch(repo, mergeq, s)
                else:
                    ret = self.apply(repo, s, list, all_files=all_files)
            except:
                self.ui.warn(_('cleaning up working directory...'))
                node = repo.dirstate.parents()[0]
                hg.revert(repo, node, None)
                unknown = repo.status(unknown=True)[4]
                # only remove unknown files that we know we touched or
                # created while patching
                for f in unknown:
                    if f in all_files:
                        util.unlink(repo.wjoin(f))
                self.ui.warn(_('done\n'))
                raise

            top = self.applied[-1].name
            if ret[0] and ret[0] > 1:
                msg = _("errors during apply, please fix and refresh %s\n")
                self.ui.write(msg % top)
            else:
                self.ui.write(_("now at: %s\n") % top)
            return ret[0]

        finally:
            wlock.release()

    def pop(self, repo, patch=None, force=False, update=True, all=False):
        def getfile(f, rev, flags):
            t = repo.file(f).read(rev)
            repo.wwrite(f, t, flags)

        wlock = repo.wlock()
        try:
            if patch:
                # index, rev, patch
                info = self.isapplied(patch)
                if not info:
                    patch = self.lookup(patch)
                info = self.isapplied(patch)
                if not info:
                    raise util.Abort(_("patch %s is not applied") % patch)

            if len(self.applied) == 0:
                # Allow qpop -a to work repeatedly,
                # but not qpop without an argument
                self.ui.warn(_("no patches applied\n"))
                return not all

            if all:
                start = 0
            elif patch:
                start = info[0] + 1
            else:
                start = len(self.applied) - 1

            if start >= len(self.applied):
                self.ui.warn(_("qpop: %s is already at the top\n") % patch)
                return

            if not update:
                parents = repo.dirstate.parents()
                rr = [ bin(x.rev) for x in self.applied ]
                for p in parents:
                    if p in rr:
                        self.ui.warn(_("qpop: forcing dirstate update\n"))
                        update = True
            else:
                parents = [p.hex() for p in repo[None].parents()]
                needupdate = False
                for entry in self.applied[start:]:
                    if entry.rev in parents:
                        needupdate = True
                        break
                update = needupdate

            if not force and update:
                self.check_localchanges(repo)

            self.applied_dirty = 1
            end = len(self.applied)
            rev = bin(self.applied[start].rev)
            if update:
                top = self.check_toppatch(repo)

            try:
                heads = repo.changelog.heads(rev)
            except error.LookupError:
                node = short(rev)
                raise util.Abort(_('trying to pop unknown node %s') % node)

            if heads != [bin(self.applied[-1].rev)]:
                raise util.Abort(_("popping would remove a revision not "
                                   "managed by this patch queue"))

            # we know there are no local changes, so we can make a simplified
            # form of hg.update.
            if update:
                qp = self.qparents(repo, rev)
                changes = repo.changelog.read(qp)
                mmap = repo.manifest.read(changes[0])
                m, a, r, d = repo.status(qp, top)[:4]
                if d:
                    raise util.Abort(_("deletions found between repo revs"))
                for f in m:
                    getfile(f, mmap[f], mmap.flags(f))
                for f in r:
                    getfile(f, mmap[f], mmap.flags(f))
                for f in m + r:
                    repo.dirstate.normal(f)
                for f in a:
                    try:
                        os.unlink(repo.wjoin(f))
                    except OSError, e:
                        if e.errno != errno.ENOENT:
                            raise
                    try: os.removedirs(os.path.dirname(repo.wjoin(f)))
                    except: pass
                    repo.dirstate.forget(f)
                repo.dirstate.setparents(qp, nullid)
            for patch in reversed(self.applied[start:end]):
                self.ui.status(_("popping %s\n") % patch.name)
            del self.applied[start:end]
            self.strip(repo, rev, update=False, backup='strip')
            if len(self.applied):
                self.ui.write(_("now at: %s\n") % self.applied[-1].name)
            else:
                self.ui.write(_("patch queue now empty\n"))
        finally:
            wlock.release()

    def diff(self, repo, pats, opts):
        top = self.check_toppatch(repo)
        if not top:
            self.ui.write(_("no patches applied\n"))
            return
        qp = self.qparents(repo, top)
        self._diffopts = patch.diffopts(self.ui, opts)
        self.printdiff(repo, qp, files=pats, opts=opts)

    def refresh(self, repo, pats=None, **opts):
        if len(self.applied) == 0:
            self.ui.write(_("no patches applied\n"))
            return 1
        msg = opts.get('msg', '').rstrip()
        newuser = opts.get('user')
        newdate = opts.get('date')
        if newdate:
            newdate = '%d %d' % util.parsedate(newdate)
        wlock = repo.wlock()
        try:
            self.check_toppatch(repo)
            (top, patchfn) = (self.applied[-1].rev, self.applied[-1].name)
            top = bin(top)
            if repo.changelog.heads(top) != [top]:
                raise util.Abort(_("cannot refresh a revision with children"))
            cparents = repo.changelog.parents(top)
            patchparent = self.qparents(repo, top)
            ph = patchheader(self.join(patchfn))

            patchf = self.opener(patchfn, 'r')

            # if the patch was a git patch, refresh it as a git patch
            for line in patchf:
                if line.startswith('diff --git'):
                    self.diffopts().git = True
                    break

            if msg:
                ph.setmessage(msg)
            if newuser:
                ph.setuser(newuser)
            if newdate:
                ph.setdate(newdate)

            # only commit new patch when write is complete
            patchf = self.opener(patchfn, 'w', atomictemp=True)

            patchf.seek(0)
            patchf.truncate()

            comments = str(ph)
            if comments:
                patchf.write(comments)

            if opts.get('git'):
                self.diffopts().git = True
            tip = repo.changelog.tip()
            if top == tip:
                # if the top of our patch queue is also the tip, there is an
                # optimization here.  We update the dirstate in place and strip
                # off the tip commit.  Then just commit the current directory
                # tree.  We can also send repo.commit the list of files
                # changed to speed up the diff
                #
                # in short mode, we only diff the files included in the
                # patch already plus specified files
                #
                # this should really read:
                #   mm, dd, aa, aa2 = repo.status(tip, patchparent)[:4]
                # but we do it backwards to take advantage of manifest/chlog
                # caching against the next repo.status call
                #
                mm, aa, dd, aa2 = repo.status(patchparent, tip)[:4]
                changes = repo.changelog.read(tip)
                man = repo.manifest.read(changes[0])
                aaa = aa[:]
                matchfn = cmdutil.match(repo, pats, opts)
                if opts.get('short'):
                    # if amending a patch, we start with existing
                    # files plus specified files - unfiltered
                    match = cmdutil.matchfiles(repo, mm + aa + dd + matchfn.files())
                    # filter with inc/exl options
                    matchfn = cmdutil.match(repo, opts=opts)
                else:
                    match = cmdutil.matchall(repo)
                m, a, r, d = repo.status(match=match)[:4]

                # we might end up with files that were added between
                # tip and the dirstate parent, but then changed in the
                # local dirstate. in this case, we want them to only
                # show up in the added section
                for x in m:
                    if x not in aa:
                        mm.append(x)
                # we might end up with files added by the local dirstate that
                # were deleted by the patch.  In this case, they should only
                # show up in the changed section.
                for x in a:
                    if x in dd:
                        del dd[dd.index(x)]
                        mm.append(x)
                    else:
                        aa.append(x)
                # make sure any files deleted in the local dirstate
                # are not in the add or change column of the patch
                forget = []
                for x in d + r:
                    if x in aa:
                        del aa[aa.index(x)]
                        forget.append(x)
                        continue
                    elif x in mm:
                        del mm[mm.index(x)]
                    dd.append(x)

                m = list(set(mm))
                r = list(set(dd))
                a = list(set(aa))
                c = [filter(matchfn, l) for l in (m, a, r)]
                match = cmdutil.matchfiles(repo, set(c[0] + c[1] + c[2]))
                chunks = patch.diff(repo, patchparent, match=match,
                                    changes=c, opts=self.diffopts())
                for chunk in chunks:
                    patchf.write(chunk)

                try:
                    if self.diffopts().git:
                        copies = {}
                        for dst in a:
                            src = repo.dirstate.copied(dst)
                            # during qfold, the source file for copies may
                            # be removed. Treat this as a simple add.
                            if src is not None and src in repo.dirstate:
                                copies.setdefault(src, []).append(dst)
                            repo.dirstate.add(dst)
                        # remember the copies between patchparent and tip
                        for dst in aaa:
                            f = repo.file(dst)
                            src = f.renamed(man[dst])
                            if src:
                                copies.setdefault(src[0], []).extend(copies.get(dst, []))
                                if dst in a:
                                    copies[src[0]].append(dst)
                            # we can't copy a file created by the patch itself
                            if dst in copies:
                                del copies[dst]
                        for src, dsts in copies.iteritems():
                            for dst in dsts:
                                repo.dirstate.copy(src, dst)
                    else:
                        for dst in a:
                            repo.dirstate.add(dst)
                        # Drop useless copy information
                        for f in list(repo.dirstate.copies()):
                            repo.dirstate.copy(None, f)
                    for f in r:
                        repo.dirstate.remove(f)
                    # if the patch excludes a modified file, mark that
                    # file with mtime=0 so status can see it.
                    mm = []
                    for i in xrange(len(m)-1, -1, -1):
                        if not matchfn(m[i]):
                            mm.append(m[i])
                            del m[i]
                    for f in m:
                        repo.dirstate.normal(f)
                    for f in mm:
                        repo.dirstate.normallookup(f)
                    for f in forget:
                        repo.dirstate.forget(f)

                    if not msg:
                        if not ph.message:
                            message = "[mq]: %s\n" % patchfn
                        else:
                            message = "\n".join(ph.message)
                    else:
                        message = msg

                    user = ph.user or changes[1]

                    # assumes strip can roll itself back if interrupted
                    repo.dirstate.setparents(*cparents)
                    self.applied.pop()
                    self.applied_dirty = 1
                    self.strip(repo, top, update=False,
                               backup='strip')
                except:
                    repo.dirstate.invalidate()
                    raise

                try:
                    # might be nice to attempt to roll back strip after this
                    patchf.rename()
                    n = repo.commit(message, user, ph.date, match=match,
                                    force=True)
                    self.applied.append(statusentry(hex(n), patchfn))
                except:
                    ctx = repo[cparents[0]]
                    repo.dirstate.rebuild(ctx.node(), ctx.manifest())
                    self.save_dirty()
                    self.ui.warn(_('refresh interrupted while patch was popped! '
                                   '(revert --all, qpush to recover)\n'))
                    raise
            else:
                self.printdiff(repo, patchparent, fp=patchf)
                patchf.rename()
                added = repo.status()[1]
                for a in added:
                    f = repo.wjoin(a)
                    try:
                        os.unlink(f)
                    except OSError, e:
                        if e.errno != errno.ENOENT:
                            raise
                    try: os.removedirs(os.path.dirname(f))
                    except: pass
                    # forget the file copies in the dirstate
                    # push should readd the files later on
                    repo.dirstate.forget(a)
                self.pop(repo, force=True)
                self.push(repo, force=True)
        finally:
            wlock.release()
            self.removeundo(repo)

    def init(self, repo, create=False):
        if not create and os.path.isdir(self.path):
            raise util.Abort(_("patch queue directory already exists"))
        try:
            os.mkdir(self.path)
        except OSError, inst:
            if inst.errno != errno.EEXIST or not create:
                raise
        if create:
            return self.qrepo(create=True)

    def unapplied(self, repo, patch=None):
        if patch and patch not in self.series:
            raise util.Abort(_("patch %s is not in series file") % patch)
        if not patch:
            start = self.series_end()
        else:
            start = self.series.index(patch) + 1
        unapplied = []
        for i in xrange(start, len(self.series)):
            pushable, reason = self.pushable(i)
            if pushable:
                unapplied.append((i, self.series[i]))
            self.explain_pushable(i)
        return unapplied

    def qseries(self, repo, missing=None, start=0, length=None, status=None,
                summary=False):
        def displayname(pfx, patchname):
            if summary:
                ph = patchheader(self.join(patchname))
                msg = ph.message
                msg = msg and ': ' + msg[0] or ': '
            else:
                msg = ''
            msg = "%s%s%s" % (pfx, patchname, msg)
            if self.ui.interactive():
                msg = util.ellipsis(msg, util.termwidth())
            self.ui.write(msg + '\n')

        applied = set([p.name for p in self.applied])
        if length is None:
            length = len(self.series) - start
        if not missing:
            if self.ui.verbose:
                idxwidth = len(str(start+length - 1))
            for i in xrange(start, start+length):
                patch = self.series[i]
                if patch in applied:
                    stat = 'A'
                elif self.pushable(i)[0]:
                    stat = 'U'
                else:
                    stat = 'G'
                pfx = ''
                if self.ui.verbose:
                    pfx = '%*d %s ' % (idxwidth, i, stat)
                elif status and status != stat:
                    continue
                displayname(pfx, patch)
        else:
            msng_list = []
            for root, dirs, files in os.walk(self.path):
                d = root[len(self.path) + 1:]
                for f in files:
                    fl = os.path.join(d, f)
                    if (fl not in self.series and
                        fl not in (self.status_path, self.series_path,
                                   self.guards_path)
                        and not fl.startswith('.')):
                        msng_list.append(fl)
            for x in sorted(msng_list):
                pfx = self.ui.verbose and ('D ') or ''
                displayname(pfx, x)

    def issaveline(self, l):
        if l.name == '.hg.patches.save.line':
            return True

    def qrepo(self, create=False):
        if create or os.path.isdir(self.join(".hg")):
            return hg.repository(self.ui, path=self.path, create=create)

    def restore(self, repo, rev, delete=None, qupdate=None):
        c = repo.changelog.read(rev)
        desc = c[4].strip()
        lines = desc.splitlines()
        i = 0
        datastart = None
        series = []
        applied = []
        qpp = None
        for i, line in enumerate(lines):
            if line == 'Patch Data:':
                datastart = i + 1
            elif line.startswith('Dirstate:'):
                l = line.rstrip()
                l = l[10:].split(' ')
                qpp = [ bin(x) for x in l ]
            elif datastart != None:
                l = line.rstrip()
                se = statusentry(l)
                file_ = se.name
                if se.rev:
                    applied.append(se)
                else:
                    series.append(file_)
        if datastart is None:
            self.ui.warn(_("No saved patch data found\n"))
            return 1
        self.ui.warn(_("restoring status: %s\n") % lines[0])
        self.full_series = series
        self.applied = applied
        self.parse_series()
        self.series_dirty = 1
        self.applied_dirty = 1
        heads = repo.changelog.heads()
        if delete:
            if rev not in heads:
                self.ui.warn(_("save entry has children, leaving it alone\n"))
            else:
                self.ui.warn(_("removing save entry %s\n") % short(rev))
                pp = repo.dirstate.parents()
                if rev in pp:
                    update = True
                else:
                    update = False
                self.strip(repo, rev, update=update, backup='strip')
        if qpp:
            self.ui.warn(_("saved queue repository parents: %s %s\n") %
                         (short(qpp[0]), short(qpp[1])))
            if qupdate:
                self.ui.status(_("queue directory updating\n"))
                r = self.qrepo()
                if not r:
                    self.ui.warn(_("Unable to load queue repository\n"))
                    return 1
                hg.clean(r, qpp[0])

    def save(self, repo, msg=None):
        if len(self.applied) == 0:
            self.ui.warn(_("save: no patches applied, exiting\n"))
            return 1
        if self.issaveline(self.applied[-1]):
            self.ui.warn(_("status is already saved\n"))
            return 1

        ar = [ ':' + x for x in self.full_series ]
        if not msg:
            msg = _("hg patches saved state")
        else:
            msg = "hg patches: " + msg.rstrip('\r\n')
        r = self.qrepo()
        if r:
            pp = r.dirstate.parents()
            msg += "\nDirstate: %s %s" % (hex(pp[0]), hex(pp[1]))
        msg += "\n\nPatch Data:\n"
        text = msg + "\n".join([str(x) for x in self.applied]) + '\n' + (ar and
                   "\n".join(ar) + '\n' or "")
        n = repo.commit(text, force=True)
        if not n:
            self.ui.warn(_("repo commit failed\n"))
            return 1
        self.applied.append(statusentry(hex(n),'.hg.patches.save.line'))
        self.applied_dirty = 1
        self.removeundo(repo)

    def full_series_end(self):
        if len(self.applied) > 0:
            p = self.applied[-1].name
            end = self.find_series(p)
            if end is None:
                return len(self.full_series)
            return end + 1
        return 0

    def series_end(self, all_patches=False):
        """If all_patches is False, return the index of the next pushable patch
        in the series, or the series length. If all_patches is True, return the
        index of the first patch past the last applied one.
        """
        end = 0
        def next(start):
            if all_patches:
                return start
            i = start
            while i < len(self.series):
                p, reason = self.pushable(i)
                if p:
                    break
                self.explain_pushable(i)
                i += 1
            return i
        if len(self.applied) > 0:
            p = self.applied[-1].name
            try:
                end = self.series.index(p)
            except ValueError:
                return 0
            return next(end + 1)
        return next(end)

    def appliedname(self, index):
        pname = self.applied[index].name
        if not self.ui.verbose:
            p = pname
        else:
            p = str(self.series.index(pname)) + " " + pname
        return p

    def qimport(self, repo, files, patchname=None, rev=None, existing=None,
                force=None, git=False):
        def checkseries(patchname):
            if patchname in self.series:
                raise util.Abort(_('patch %s is already in the series file')
                                 % patchname)
        def checkfile(patchname):
            if not force and os.path.exists(self.join(patchname)):
                raise util.Abort(_('patch "%s" already exists')
                                 % patchname)

        if rev:
            if files:
                raise util.Abort(_('option "-r" not valid when importing '
                                   'files'))
            rev = cmdutil.revrange(repo, rev)
            rev.sort(reverse=True)
        if (len(files) > 1 or len(rev) > 1) and patchname:
            raise util.Abort(_('option "-n" not valid when importing multiple '
                               'patches'))
        i = 0
        added = []
        if rev:
            # If mq patches are applied, we can only import revisions
            # that form a linear path to qbase.
            # Otherwise, they should form a linear path to a head.
            heads = repo.changelog.heads(repo.changelog.node(rev[-1]))
            if len(heads) > 1:
                raise util.Abort(_('revision %d is the root of more than one '
                                   'branch') % rev[-1])
            if self.applied:
                base = hex(repo.changelog.node(rev[0]))
                if base in [n.rev for n in self.applied]:
                    raise util.Abort(_('revision %d is already managed')
                                     % rev[0])
                if heads != [bin(self.applied[-1].rev)]:
                    raise util.Abort(_('revision %d is not the parent of '
                                       'the queue') % rev[0])
                base = repo.changelog.rev(bin(self.applied[0].rev))
                lastparent = repo.changelog.parentrevs(base)[0]
            else:
                if heads != [repo.changelog.node(rev[0])]:
                    raise util.Abort(_('revision %d has unmanaged children')
                                     % rev[0])
                lastparent = None

            if git:
                self.diffopts().git = True

            for r in rev:
                p1, p2 = repo.changelog.parentrevs(r)
                n = repo.changelog.node(r)
                if p2 != nullrev:
                    raise util.Abort(_('cannot import merge revision %d') % r)
                if lastparent and lastparent != r:
                    raise util.Abort(_('revision %d is not the parent of %d')
                                     % (r, lastparent))
                lastparent = p1

                if not patchname:
                    patchname = normname('%d.diff' % r)
                self.check_reserved_name(patchname)
                checkseries(patchname)
                checkfile(patchname)
                self.full_series.insert(0, patchname)

                patchf = self.opener(patchname, "w")
                patch.export(repo, [n], fp=patchf, opts=self.diffopts())
                patchf.close()

                se = statusentry(hex(n), patchname)
                self.applied.insert(0, se)

                added.append(patchname)
                patchname = None
            self.parse_series()
            self.applied_dirty = 1

        for filename in files:
            if existing:
                if filename == '-':
                    raise util.Abort(_('-e is incompatible with import from -'))
                if not patchname:
                    patchname = normname(filename)
                self.check_reserved_name(patchname)
                if not os.path.isfile(self.join(patchname)):
                    raise util.Abort(_("patch %s does not exist") % patchname)
            else:
                try:
                    if filename == '-':
                        if not patchname:
                            raise util.Abort(_('need --name to import a patch from -'))
                        text = sys.stdin.read()
                    else:
                        text = url.open(self.ui, filename).read()
                except (OSError, IOError):
                    raise util.Abort(_("unable to read %s") % filename)
                if not patchname:
                    patchname = normname(os.path.basename(filename))
                self.check_reserved_name(patchname)
                checkfile(patchname)
                patchf = self.opener(patchname, "w")
                patchf.write(text)
            if not force:
                checkseries(patchname)
            if patchname not in self.series:
                index = self.full_series_end() + i
                self.full_series[index:index] = [patchname]
            self.parse_series()
            self.ui.warn(_("adding %s to series file\n") % patchname)
            i += 1
            added.append(patchname)
            patchname = None
        self.series_dirty = 1
        qrepo = self.qrepo()
        if qrepo:
            qrepo.add(added)

def delete(ui, repo, *patches, **opts):
    """remove patches from queue

    The patches must not be applied, and at least one patch is required. With
    -k/--keep, the patch files are preserved in the patch directory.

    To stop managing a patch and move it into permanent history,
    use the qfinish command."""
    q = repo.mq
    q.delete(repo, patches, opts)
    q.save_dirty()
    return 0

def applied(ui, repo, patch=None, **opts):
    """print the patches already applied"""

    q = repo.mq
    l = len(q.applied)

    if patch:
        if patch not in q.series:
            raise util.Abort(_("patch %s is not in series file") % patch)
        end = q.series.index(patch) + 1
    else:
        end = q.series_end(True)

    if opts.get('last') and not end:
        ui.write(_("no patches applied\n"))
        return 1
    elif opts.get('last') and end == 1:
        ui.write(_("only one patch applied\n"))
        return 1
    elif opts.get('last'):
        start = end - 2
        end = 1
    else:
        start = 0

    return q.qseries(repo, length=end, start=start, status='A',
                     summary=opts.get('summary'))

def unapplied(ui, repo, patch=None, **opts):
    """print the patches not yet applied"""

    q = repo.mq
    if patch:
        if patch not in q.series:
            raise util.Abort(_("patch %s is not in series file") % patch)
        start = q.series.index(patch) + 1
    else:
        start = q.series_end(True)

    if start == len(q.series) and opts.get('first'):
        ui.write(_("all patches applied\n"))
        return 1

    length = opts.get('first') and 1 or None
    return q.qseries(repo, start=start, length=length, status='U',
                     summary=opts.get('summary'))

def qimport(ui, repo, *filename, **opts):
    """import a patch

    The patch is inserted into the series after the last applied
    patch. If no patches have been applied, qimport prepends the patch
    to the series.

    The patch will have the same name as its source file unless you
    give it a new one with -n/--name.

    You can register an existing patch inside the patch directory with
    the -e/--existing flag.

    With -f/--force, an existing patch of the same name will be
    overwritten.

    An existing changeset may be placed under mq control with -r/--rev
    (e.g. qimport --rev tip -n patch will place tip under mq control).
    With -g/--git, patches imported with --rev will use the git diff
    format. See the diffs help topic for information on why this is
    important for preserving rename/copy information and permission
    changes.

    To import a patch from standard input, pass - as the patch file.
    When importing from standard input, a patch name must be specified
    using the --name flag.
    """
    q = repo.mq
    q.qimport(repo, filename, patchname=opts['name'],
              existing=opts['existing'], force=opts['force'], rev=opts['rev'],
              git=opts['git'])
    q.save_dirty()

    if opts.get('push') and not opts.get('rev'):
        return q.push(repo, None)
    return 0

def init(ui, repo, **opts):
    """init a new queue repository

    The queue repository is unversioned by default. If
    -c/--create-repo is specified, qinit will create a separate nested
    repository for patches (qinit -c may also be run later to convert
    an unversioned patch repository into a versioned one). You can use
    qcommit to commit changes to this queue repository."""
    q = repo.mq
    r = q.init(repo, create=opts['create_repo'])
    q.save_dirty()
    if r:
        if not os.path.exists(r.wjoin('.hgignore')):
            fp = r.wopener('.hgignore', 'w')
            fp.write('^\\.hg\n')
            fp.write('^\\.mq\n')
            fp.write('syntax: glob\n')
            fp.write('status\n')
            fp.write('guards\n')
            fp.close()
        if not os.path.exists(r.wjoin('series')):
            r.wopener('series', 'w').close()
        r.add(['.hgignore', 'series'])
        commands.add(ui, r)
    return 0

def clone(ui, source, dest=None, **opts):
    '''clone main and patch repository at same time

    If source is local, destination will have no patches applied. If
    source is remote, this command can not check if patches are
    applied in source, so cannot guarantee that patches are not
    applied in destination. If you clone remote repository, be sure
    before that it has no patches applied.

    Source patch repository is looked for in <src>/.hg/patches by
    default. Use -p <url> to change.

    The patch directory must be a nested Mercurial repository, as
    would be created by qinit -c.
    '''
    def patchdir(repo):
        url = repo.url()
        if url.endswith('/'):
            url = url[:-1]
        return url + '/.hg/patches'
    if dest is None:
        dest = hg.defaultdest(source)
    sr = hg.repository(cmdutil.remoteui(ui, opts), ui.expandpath(source))
    if opts['patches']:
        patchespath = ui.expandpath(opts['patches'])
    else:
        patchespath = patchdir(sr)
    try:
        hg.repository(ui, patchespath)
    except error.RepoError:
        raise util.Abort(_('versioned patch repository not found'
                           ' (see qinit -c)'))
    qbase, destrev = None, None
    if sr.local():
        if sr.mq.applied:
            qbase = bin(sr.mq.applied[0].rev)
            if not hg.islocal(dest):
                heads = set(sr.heads())
                destrev = list(heads.difference(sr.heads(qbase)))
                destrev.append(sr.changelog.parents(qbase)[0])
    elif sr.capable('lookup'):
        try:
            qbase = sr.lookup('qbase')
        except error.RepoError:
            pass
    ui.note(_('cloning main repository\n'))
    sr, dr = hg.clone(ui, sr.url(), dest,
                      pull=opts['pull'],
                      rev=destrev,
                      update=False,
                      stream=opts['uncompressed'])
    ui.note(_('cloning patch repository\n'))
    hg.clone(ui, opts['patches'] or patchdir(sr), patchdir(dr),
             pull=opts['pull'], update=not opts['noupdate'],
             stream=opts['uncompressed'])
    if dr.local():
        if qbase:
            ui.note(_('stripping applied patches from destination '
                      'repository\n'))
            dr.mq.strip(dr, qbase, update=False, backup=None)
        if not opts['noupdate']:
            ui.note(_('updating destination repository\n'))
            hg.update(dr, dr.changelog.tip())

def commit(ui, repo, *pats, **opts):
    """commit changes in the queue repository"""
    q = repo.mq
    r = q.qrepo()
    if not r: raise util.Abort('no queue repository')
    commands.commit(r.ui, r, *pats, **opts)

def series(ui, repo, **opts):
    """print the entire series file"""
    repo.mq.qseries(repo, missing=opts['missing'], summary=opts['summary'])
    return 0

def top(ui, repo, **opts):
    """print the name of the current patch"""
    q = repo.mq
    t = q.applied and q.series_end(True) or 0
    if t:
        return q.qseries(repo, start=t-1, length=1, status='A',
                         summary=opts.get('summary'))
    else:
        ui.write(_("no patches applied\n"))
        return 1

def next(ui, repo, **opts):
    """print the name of the next patch"""
    q = repo.mq
    end = q.series_end()
    if end == len(q.series):
        ui.write(_("all patches applied\n"))
        return 1
    return q.qseries(repo, start=end, length=1, summary=opts.get('summary'))

def prev(ui, repo, **opts):
    """print the name of the previous patch"""
    q = repo.mq
    l = len(q.applied)
    if l == 1:
        ui.write(_("only one patch applied\n"))
        return 1
    if not l:
        ui.write(_("no patches applied\n"))
        return 1
    return q.qseries(repo, start=l-2, length=1, status='A',
                     summary=opts.get('summary'))

def setupheaderopts(ui, opts):
    def do(opt, val):
        if not opts[opt] and opts['current' + opt]:
            opts[opt] = val
    do('user', ui.username())
    do('date', "%d %d" % util.makedate())

def new(ui, repo, patch, *args, **opts):
    """create a new patch

    qnew creates a new patch on top of the currently-applied patch (if
    any). It will refuse to run if there are any outstanding changes
    unless -f/--force is specified, in which case the patch will be
    initialized with them. You may also use -I/--include,
    -X/--exclude, and/or a list of files after the patch name to add
    only changes to matching files to the new patch, leaving the rest
    as uncommitted modifications.

    -u/--user and -d/--date can be used to set the (given) user and
    date, respectively. -U/--currentuser and -D/--currentdate set user
    to current user and date to current date.

    -e/--edit, -m/--message or -l/--logfile set the patch header as
    well as the commit message. If none is specified, the header is
    empty and the commit message is '[mq]: PATCH'.

    Use the -g/--git option to keep the patch in the git extended diff
    format. Read the diffs help topic for more information on why this
    is important for preserving permission changes and copy/rename
    information.
    """
    msg = cmdutil.logmessage(opts)
    def getmsg(): return ui.edit(msg, ui.username())
    q = repo.mq
    opts['msg'] = msg
    if opts.get('edit'):
        opts['msg'] = getmsg
    else:
        opts['msg'] = msg
    setupheaderopts(ui, opts)
    q.new(repo, patch, *args, **opts)
    q.save_dirty()
    return 0

def refresh(ui, repo, *pats, **opts):
    """update the current patch

    If any file patterns are provided, the refreshed patch will
    contain only the modifications that match those patterns; the
    remaining modifications will remain in the working directory.

    If -s/--short is specified, files currently included in the patch
    will be refreshed just like matched files and remain in the patch.

    hg add/remove/copy/rename work as usual, though you might want to
    use git-style patches (-g/--git or [diff] git=1) to track copies
    and renames. See the diffs help topic for more information on the
    git diff format.
    """
    q = repo.mq
    message = cmdutil.logmessage(opts)
    if opts['edit']:
        if not q.applied:
            ui.write(_("no patches applied\n"))
            return 1
        if message:
            raise util.Abort(_('option "-e" incompatible with "-m" or "-l"'))
        patch = q.applied[-1].name
        ph = patchheader(q.join(patch))
        message = ui.edit('\n'.join(ph.message), ph.user or ui.username())
    setupheaderopts(ui, opts)
    ret = q.refresh(repo, pats, msg=message, **opts)
    q.save_dirty()
    return ret

def diff(ui, repo, *pats, **opts):
    """diff of the current patch and subsequent modifications

    Shows a diff which includes the current patch as well as any
    changes which have been made in the working directory since the
    last refresh (thus showing what the current patch would become
    after a qrefresh).

    Use 'hg diff' if you only want to see the changes made since the
    last qrefresh, or 'hg export qtip' if you want to see changes made
    by the current patch without including changes made since the
    qrefresh.
    """
    repo.mq.diff(repo, pats, opts)
    return 0

def fold(ui, repo, *files, **opts):
    """fold the named patches into the current patch

    Patches must not yet be applied. Each patch will be successively
    applied to the current patch in the order given. If all the
    patches apply successfully, the current patch will be refreshed
    with the new cumulative patch, and the folded patches will be
    deleted. With -k/--keep, the folded patch files will not be
    removed afterwards.

    The header for each folded patch will be concatenated with the
    current patch header, separated by a line of '* * *'."""

    q = repo.mq

    if not files:
        raise util.Abort(_('qfold requires at least one patch name'))
    if not q.check_toppatch(repo):
        raise util.Abort(_('No patches applied'))
    q.check_localchanges(repo)

    message = cmdutil.logmessage(opts)
    if opts['edit']:
        if message:
            raise util.Abort(_('option "-e" incompatible with "-m" or "-l"'))

    parent = q.lookup('qtip')
    patches = []
    messages = []
    for f in files:
        p = q.lookup(f)
        if p in patches or p == parent:
            ui.warn(_('Skipping already folded patch %s') % p)
        if q.isapplied(p):
            raise util.Abort(_('qfold cannot fold already applied patch %s') % p)
        patches.append(p)

    for p in patches:
        if not message:
            ph = patchheader(q.join(p))
            if ph.message:
                messages.append(ph.message)
        pf = q.join(p)
        (patchsuccess, files, fuzz) = q.patch(repo, pf)
        if not patchsuccess:
            raise util.Abort(_('Error folding patch %s') % p)
        patch.updatedir(ui, repo, files)

    if not message:
        ph = patchheader(q.join(parent))
        message, user = ph.message, ph.user
        for msg in messages:
            message.append('* * *')
            message.extend(msg)
        message = '\n'.join(message)

    if opts['edit']:
        message = ui.edit(message, user or ui.username())

    q.refresh(repo, msg=message)
    q.delete(repo, patches, opts)
    q.save_dirty()

def goto(ui, repo, patch, **opts):
    '''push or pop patches until named patch is at top of stack'''
    q = repo.mq
    patch = q.lookup(patch)
    if q.isapplied(patch):
        ret = q.pop(repo, patch, force=opts['force'])
    else:
        ret = q.push(repo, patch, force=opts['force'])
    q.save_dirty()
    return ret

def guard(ui, repo, *args, **opts):
    '''set or print guards for a patch

    Guards control whether a patch can be pushed. A patch with no
    guards is always pushed. A patch with a positive guard ("+foo") is
    pushed only if the qselect command has activated it. A patch with
    a negative guard ("-foo") is never pushed if the qselect command
    has activated it.

    With no arguments, print the currently active guards.
    With arguments, set guards for the named patch.
    NOTE: Specifying negative guards now requires '--'.

    To set guards on another patch:
      hg qguard -- other.patch +2.6.17 -stable
    '''
    def status(idx):
        guards = q.series_guards[idx] or ['unguarded']
        ui.write('%s: %s\n' % (q.series[idx], ' '.join(guards)))
    q = repo.mq
    patch = None
    args = list(args)
    if opts['list']:
        if args or opts['none']:
            raise util.Abort(_('cannot mix -l/--list with options or arguments'))
        for i in xrange(len(q.series)):
            status(i)
        return
    if not args or args[0][0:1] in '-+':
        if not q.applied:
            raise util.Abort(_('no patches applied'))
        patch = q.applied[-1].name
    if patch is None and args[0][0:1] not in '-+':
        patch = args.pop(0)
    if patch is None:
        raise util.Abort(_('no patch to work with'))
    if args or opts['none']:
        idx = q.find_series(patch)
        if idx is None:
            raise util.Abort(_('no patch named %s') % patch)
        q.set_guards(idx, args)
        q.save_dirty()
    else:
        status(q.series.index(q.lookup(patch)))

def header(ui, repo, patch=None):
    """print the header of the topmost or specified patch"""
    q = repo.mq

    if patch:
        patch = q.lookup(patch)
    else:
        if not q.applied:
            ui.write('no patches applied\n')
            return 1
        patch = q.lookup('qtip')
    ph = patchheader(repo.mq.join(patch))

    ui.write('\n'.join(ph.message) + '\n')

def lastsavename(path):
    (directory, base) = os.path.split(path)
    names = os.listdir(directory)
    namere = re.compile("%s.([0-9]+)" % base)
    maxindex = None
    maxname = None
    for f in names:
        m = namere.match(f)
        if m:
            index = int(m.group(1))
            if maxindex is None or index > maxindex:
                maxindex = index
                maxname = f
    if maxname:
        return (os.path.join(directory, maxname), maxindex)
    return (None, None)

def savename(path):
    (last, index) = lastsavename(path)
    if last is None:
        index = 0
    newpath = path + ".%d" % (index + 1)
    return newpath

def push(ui, repo, patch=None, **opts):
    """push the next patch onto the stack

    When -f/--force is applied, all local changes in patched files
    will be lost.
    """
    q = repo.mq
    mergeq = None

    if opts['merge']:
        if opts['name']:
            newpath = repo.join(opts['name'])
        else:
            newpath, i = lastsavename(q.path)
        if not newpath:
            ui.warn(_("no saved queues found, please use -n\n"))
            return 1
        mergeq = queue(ui, repo.join(""), newpath)
        ui.warn(_("merging with queue at: %s\n") % mergeq.path)
    ret = q.push(repo, patch, force=opts['force'], list=opts['list'],
                 mergeq=mergeq, all=opts.get('all'))
    return ret

def pop(ui, repo, patch=None, **opts):
    """pop the current patch off the stack

    By default, pops off the top of the patch stack. If given a patch
    name, keeps popping off patches until the named patch is at the
    top of the stack.
    """
    localupdate = True
    if opts['name']:
        q = queue(ui, repo.join(""), repo.join(opts['name']))
        ui.warn(_('using patch queue: %s\n') % q.path)
        localupdate = False
    else:
        q = repo.mq
    ret = q.pop(repo, patch, force=opts['force'], update=localupdate,
                all=opts['all'])
    q.save_dirty()
    return ret

def rename(ui, repo, patch, name=None, **opts):
    """rename a patch

    With one argument, renames the current patch to PATCH1.
    With two arguments, renames PATCH1 to PATCH2."""

    q = repo.mq

    if not name:
        name = patch
        patch = None

    if patch:
        patch = q.lookup(patch)
    else:
        if not q.applied:
            ui.write(_('no patches applied\n'))
            return
        patch = q.lookup('qtip')
    absdest = q.join(name)
    if os.path.isdir(absdest):
        name = normname(os.path.join(name, os.path.basename(patch)))
        absdest = q.join(name)
    if os.path.exists(absdest):
        raise util.Abort(_('%s already exists') % absdest)

    if name in q.series:
        raise util.Abort(_('A patch named %s already exists in the series file') % name)

    if ui.verbose:
        ui.write('renaming %s to %s\n' % (patch, name))
    i = q.find_series(patch)
    guards = q.guard_re.findall(q.full_series[i])
    q.full_series[i] = name + ''.join([' #' + g for g in guards])
    q.parse_series()
    q.series_dirty = 1

    info = q.isapplied(patch)
    if info:
        q.applied[info[0]] = statusentry(info[1], name)
    q.applied_dirty = 1

    util.rename(q.join(patch), absdest)
    r = q.qrepo()
    if r:
        wlock = r.wlock()
        try:
            if r.dirstate[patch] == 'a':
                r.dirstate.forget(patch)
                r.dirstate.add(name)
            else:
                if r.dirstate[name] == 'r':
                    r.undelete([name])
                r.copy(patch, name)
                r.remove([patch], False)
        finally:
            wlock.release()

    q.save_dirty()

def restore(ui, repo, rev, **opts):
    """restore the queue state saved by a revision"""
    rev = repo.lookup(rev)
    q = repo.mq
    q.restore(repo, rev, delete=opts['delete'],
              qupdate=opts['update'])
    q.save_dirty()
    return 0

def save(ui, repo, **opts):
    """save current queue state"""
    q = repo.mq
    message = cmdutil.logmessage(opts)
    ret = q.save(repo, msg=message)
    if ret:
        return ret
    q.save_dirty()
    if opts['copy']:
        path = q.path
        if opts['name']:
            newpath = os.path.join(q.basepath, opts['name'])
            if os.path.exists(newpath):
                if not os.path.isdir(newpath):
                    raise util.Abort(_('destination %s exists and is not '
                                       'a directory') % newpath)
                if not opts['force']:
                    raise util.Abort(_('destination %s exists, '
                                       'use -f to force') % newpath)
        else:
            newpath = savename(path)
        ui.warn(_("copy %s to %s\n") % (path, newpath))
        util.copyfiles(path, newpath)
    if opts['empty']:
        try:
            os.unlink(q.join(q.status_path))
        except:
            pass
    return 0

def strip(ui, repo, rev, **opts):
    """strip a revision and all its descendants from the repository

    If one of the working directory's parent revisions is stripped, the
    working directory will be updated to the parent of the stripped
    revision.
    """
    backup = 'all'
    if opts['backup']:
        backup = 'strip'
    elif opts['nobackup']:
        backup = 'none'

    rev = repo.lookup(rev)
    p = repo.dirstate.parents()
    cl = repo.changelog
    update = True
    if p[0] == nullid:
        update = False
    elif p[1] == nullid and rev != cl.ancestor(p[0], rev):
        update = False
    elif rev not in (cl.ancestor(p[0], rev), cl.ancestor(p[1], rev)):
        update = False

    repo.mq.strip(repo, rev, backup=backup, update=update, force=opts['force'])
    return 0

def select(ui, repo, *args, **opts):
    '''set or print guarded patches to push

    Use the qguard command to set or print guards on patch, then use
    qselect to tell mq which guards to use. A patch will be pushed if
    it has no guards or any positive guards match the currently
    selected guard, but will not be pushed if any negative guards
    match the current guard. For example:

        qguard foo.patch -stable    (negative guard)
        qguard bar.patch +stable    (positive guard)
        qselect stable

    This activates the "stable" guard. mq will skip foo.patch (because
    it has a negative match) but push bar.patch (because it has a
    positive match).

    With no arguments, prints the currently active guards.
    With one argument, sets the active guard.

    Use -n/--none to deactivate guards (no other arguments needed).
    When no guards are active, patches with positive guards are
    skipped and patches with negative guards are pushed.

    qselect can change the guards on applied patches. It does not pop
    guarded patches by default. Use --pop to pop back to the last
    applied patch that is not guarded. Use --reapply (which implies
    --pop) to push back to the current patch afterwards, but skip
    guarded patches.

    Use -s/--series to print a list of all guards in the series file
    (no other arguments needed). Use -v for more information.'''

    q = repo.mq
    guards = q.active()
    if args or opts['none']:
        old_unapplied = q.unapplied(repo)
        old_guarded = [i for i in xrange(len(q.applied)) if
                       not q.pushable(i)[0]]
        q.set_active(args)
        q.save_dirty()
        if not args:
            ui.status(_('guards deactivated\n'))
        if not opts['pop'] and not opts['reapply']:
            unapplied = q.unapplied(repo)
            guarded = [i for i in xrange(len(q.applied))
                       if not q.pushable(i)[0]]
            if len(unapplied) != len(old_unapplied):
                ui.status(_('number of unguarded, unapplied patches has '
                            'changed from %d to %d\n') %
                          (len(old_unapplied), len(unapplied)))
            if len(guarded) != len(old_guarded):
                ui.status(_('number of guarded, applied patches has changed '
                            'from %d to %d\n') %
                          (len(old_guarded), len(guarded)))
    elif opts['series']:
        guards = {}
        noguards = 0
        for gs in q.series_guards:
            if not gs:
                noguards += 1
            for g in gs:
                guards.setdefault(g, 0)
                guards[g] += 1
        if ui.verbose:
            guards['NONE'] = noguards
        guards = guards.items()
        guards.sort(key=lambda x: x[0][1:])
        if guards:
            ui.note(_('guards in series file:\n'))
            for guard, count in guards:
                ui.note('%2d  ' % count)
                ui.write(guard, '\n')
        else:
            ui.note(_('no guards in series file\n'))
    else:
        if guards:
            ui.note(_('active guards:\n'))
            for g in guards:
                ui.write(g, '\n')
        else:
            ui.write(_('no active guards\n'))
    reapply = opts['reapply'] and q.applied and q.appliedname(-1)
    popped = False
    if opts['pop'] or opts['reapply']:
        for i in xrange(len(q.applied)):
            pushable, reason = q.pushable(i)
            if not pushable:
                ui.status(_('popping guarded patches\n'))
                popped = True
                if i == 0:
                    q.pop(repo, all=True)
                else:
                    q.pop(repo, i-1)
                break
    if popped:
        try:
            if reapply:
                ui.status(_('reapplying unguarded patches\n'))
                q.push(repo, reapply)
        finally:
            q.save_dirty()

def finish(ui, repo, *revrange, **opts):
    """move applied patches into repository history

    Finishes the specified revisions (corresponding to applied
    patches) by moving them out of mq control into regular repository
    history.

    Accepts a revision range or the -a/--applied option. If --applied
    is specified, all applied mq revisions are removed from mq
    control. Otherwise, the given revisions must be at the base of the
    stack of applied patches.

    This can be especially useful if your changes have been applied to
    an upstream repository, or if you are about to push your changes
    to upstream.
    """
    if not opts['applied'] and not revrange:
        raise util.Abort(_('no revisions specified'))
    elif opts['applied']:
        revrange = ('qbase:qtip',) + revrange

    q = repo.mq
    if not q.applied:
        ui.status(_('no patches applied\n'))
        return 0

    revs = cmdutil.revrange(repo, revrange)
    q.finish(repo, revs)
    q.save_dirty()
    return 0

def reposetup(ui, repo):
    class mqrepo(repo.__class__):
        @util.propertycache
        def mq(self):
            return queue(self.ui, self.join(""))

        def abort_if_wdir_patched(self, errmsg, force=False):
            if self.mq.applied and not force:
                parent = hex(self.dirstate.parents()[0])
                if parent in [s.rev for s in self.mq.applied]:
                    raise util.Abort(errmsg)

        def commit(self, text="", user=None, date=None, match=None,
                   force=False, editor=False, extra={}):
            self.abort_if_wdir_patched(
                _('cannot commit over an applied mq patch'),
                force)

            return super(mqrepo, self).commit(text, user, date, match, force,
                                              editor, extra)

        def push(self, remote, force=False, revs=None):
            if self.mq.applied and not force and not revs:
                raise util.Abort(_('source has mq patches applied'))
            return super(mqrepo, self).push(remote, force, revs)

        def _findtags(self):
            '''augment tags from base class with patch tags'''
            result = super(mqrepo, self)._findtags()

            q = self.mq
            if not q.applied:
                return result

            mqtags = [(bin(patch.rev), patch.name) for patch in q.applied]

            if mqtags[-1][0] not in self.changelog.nodemap:
                self.ui.warn(_('mq status file refers to unknown node %s\n')
                             % short(mqtags[-1][0]))
                return result

            mqtags.append((mqtags[-1][0], 'qtip'))
            mqtags.append((mqtags[0][0], 'qbase'))
            mqtags.append((self.changelog.parents(mqtags[0][0])[0], 'qparent'))
            tags = result[0]
            for patch in mqtags:
                if patch[1] in tags:
                    self.ui.warn(_('Tag %s overrides mq patch of the same name\n')
                                 % patch[1])
                else:
                    tags[patch[1]] = patch[0]

            return result

        def _branchtags(self, partial, lrev):
            q = self.mq
            if not q.applied:
                return super(mqrepo, self)._branchtags(partial, lrev)

            cl = self.changelog
            qbasenode = bin(q.applied[0].rev)
            if qbasenode not in cl.nodemap:
                self.ui.warn(_('mq status file refers to unknown node %s\n')
                             % short(qbasenode))
                return super(mqrepo, self)._branchtags(partial, lrev)

            qbase = cl.rev(qbasenode)
            start = lrev + 1
            if start < qbase:
                # update the cache (excluding the patches) and save it
                self._updatebranchcache(partial, lrev+1, qbase)
                self._writebranchcache(partial, cl.node(qbase-1), qbase-1)
                start = qbase
            # if start = qbase, the cache is as updated as it should be.
            # if start > qbase, the cache includes (part of) the patches.
            # we might as well use it, but we won't save it.

            # update the cache up to the tip
            self._updatebranchcache(partial, start, len(cl))

            return partial

    if repo.local():
        repo.__class__ = mqrepo

def mqimport(orig, ui, repo, *args, **kwargs):
    if hasattr(repo, 'abort_if_wdir_patched'):
        repo.abort_if_wdir_patched(_('cannot import over an applied patch'),
                                   kwargs.get('force'))
    return orig(ui, repo, *args, **kwargs)

def uisetup(ui):
    extensions.wrapcommand(commands.table, 'import', mqimport)

seriesopts = [('s', 'summary', None, _('print first line of patch header'))]

cmdtable = {
    "qapplied":
        (applied,
         [('1', 'last', None, _('show only the last patch'))] + seriesopts,
         _('hg qapplied [-1] [-s] [PATCH]')),
    "qclone":
        (clone,
         [('', 'pull', None, _('use pull protocol to copy metadata')),
          ('U', 'noupdate', None, _('do not update the new working directories')),
          ('', 'uncompressed', None,
           _('use uncompressed transfer (fast over LAN)')),
          ('p', 'patches', '', _('location of source patch repository')),
         ] + commands.remoteopts,
         _('hg qclone [OPTION]... SOURCE [DEST]')),
    "qcommit|qci":
        (commit,
         commands.table["^commit|ci"][1],
         _('hg qcommit [OPTION]... [FILE]...')),
    "^qdiff":
        (diff,
         commands.diffopts + commands.diffopts2 + commands.walkopts,
         _('hg qdiff [OPTION]... [FILE]...')),
    "qdelete|qremove|qrm":
        (delete,
         [('k', 'keep', None, _('keep patch file')),
          ('r', 'rev', [], _('stop managing a revision (DEPRECATED)'))],
         _('hg qdelete [-k] [-r REV]... [PATCH]...')),
    'qfold':
        (fold,
         [('e', 'edit', None, _('edit patch header')),
          ('k', 'keep', None, _('keep folded patch files')),
         ] + commands.commitopts,
         _('hg qfold [-e] [-k] [-m TEXT] [-l FILE] PATCH...')),
    'qgoto':
        (goto,
         [('f', 'force', None, _('overwrite any local changes'))],
         _('hg qgoto [OPTION]... PATCH')),
    'qguard':
        (guard,
         [('l', 'list', None, _('list all patches and guards')),
          ('n', 'none', None, _('drop all guards'))],
         _('hg qguard [-l] [-n] -- [PATCH] [+GUARD]... [-GUARD]...')),
    'qheader': (header, [], _('hg qheader [PATCH]')),
    "^qimport":
        (qimport,
         [('e', 'existing', None, _('import file in patch directory')),
          ('n', 'name', '', _('name of patch file')),
          ('f', 'force', None, _('overwrite existing files')),
          ('r', 'rev', [], _('place existing revisions under mq control')),
          ('g', 'git', None, _('use git extended diff format')),
          ('P', 'push', None, _('qpush after importing'))],
         _('hg qimport [-e] [-n NAME] [-f] [-g] [-P] [-r REV]... FILE...')),
    "^qinit":
        (init,
         [('c', 'create-repo', None, _('create queue repository'))],
         _('hg qinit [-c]')),
    "qnew":
        (new,
         [('e', 'edit', None, _('edit commit message')),
          ('f', 'force', None, _('import uncommitted changes into patch')),
          ('g', 'git', None, _('use git extended diff format')),
          ('U', 'currentuser', None, _('add "From: <current user>" to patch')),
          ('u', 'user', '', _('add "From: <given user>" to patch')),
          ('D', 'currentdate', None, _('add "Date: <current date>" to patch')),
          ('d', 'date', '', _('add "Date: <given date>" to patch'))
          ] + commands.walkopts + commands.commitopts,
         _('hg qnew [-e] [-m TEXT] [-l FILE] [-f] PATCH [FILE]...')),
    "qnext": (next, [] + seriesopts, _('hg qnext [-s]')),
    "qprev": (prev, [] + seriesopts, _('hg qprev [-s]')),
    "^qpop":
        (pop,
         [('a', 'all', None, _('pop all patches')),
          ('n', 'name', '', _('queue name to pop')),
          ('f', 'force', None, _('forget any local changes'))],
         _('hg qpop [-a] [-n NAME] [-f] [PATCH | INDEX]')),
    "^qpush":
        (push,
         [('f', 'force', None, _('apply if the patch has rejects')),
          ('l', 'list', None, _('list patch name in commit text')),
          ('a', 'all', None, _('apply all patches')),
          ('m', 'merge', None, _('merge from another queue')),
          ('n', 'name', '', _('merge queue name'))],
         _('hg qpush [-f] [-l] [-a] [-m] [-n NAME] [PATCH | INDEX]')),
    "^qrefresh":
        (refresh,
         [('e', 'edit', None, _('edit commit message')),
          ('g', 'git', None, _('use git extended diff format')),
          ('s', 'short', None, _('refresh only files already in the patch and specified files')),
          ('U', 'currentuser', None, _('add/update author field in patch with current user')),
          ('u', 'user', '', _('add/update author field in patch with given user')),
          ('D', 'currentdate', None, _('add/update date field in patch with current date')),
          ('d', 'date', '', _('add/update date field in patch with given date'))
          ] + commands.walkopts + commands.commitopts,
         _('hg qrefresh [-I] [-X] [-e] [-m TEXT] [-l FILE] [-s] [FILE]...')),
    'qrename|qmv':
        (rename, [], _('hg qrename PATCH1 [PATCH2]')),
    "qrestore":
        (restore,
         [('d', 'delete', None, _('delete save entry')),
          ('u', 'update', None, _('update queue working directory'))],
         _('hg qrestore [-d] [-u] REV')),
    "qsave":
        (save,
         [('c', 'copy', None, _('copy patch directory')),
          ('n', 'name', '', _('copy directory name')),
          ('e', 'empty', None, _('clear queue status file')),
          ('f', 'force', None, _('force copy'))] + commands.commitopts,
         _('hg qsave [-m TEXT] [-l FILE] [-c] [-n NAME] [-e] [-f]')),
    "qselect":
        (select,
         [('n', 'none', None, _('disable all guards')),
          ('s', 'series', None, _('list all guards in series file')),
          ('', 'pop', None, _('pop to before first guarded applied patch')),
          ('', 'reapply', None, _('pop, then reapply patches'))],
         _('hg qselect [OPTION]... [GUARD]...')),
    "qseries":
        (series,
         [('m', 'missing', None, _('print patches not in series')),
         ] + seriesopts,
         _('hg qseries [-ms]')),
    "^strip":
        (strip,
         [('f', 'force', None, _('force removal with local changes')),
          ('b', 'backup', None, _('bundle unrelated changesets')),
          ('n', 'nobackup', None, _('no backups'))],
         _('hg strip [-f] [-b] [-n] REV')),
    "qtop": (top, [] + seriesopts, _('hg qtop [-s]')),
    "qunapplied":
        (unapplied,
         [('1', 'first', None, _('show only the first patch'))] + seriesopts,
         _('hg qunapplied [-1] [-s] [PATCH]')),
    "qfinish":
        (finish,
         [('a', 'applied', None, _('finish all applied changesets'))],
         _('hg qfinish [-a] [REV]...')),
}