mq: create patch header class to abstract header manipulation

hgext/mq.py

@@ -1,2529 +1,2554 b''
 # 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, incorporated herein by reference.
 
 '''patch management and development
 
 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
 print name of top applied patch           qtop
 
 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
 from mercurial.repo import RepoError
 from mercurial import commands, cmdutil, hg, patch, revlog, util
 from mercurial import repair, extensions, url
 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:
     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, message, comments, user, date, haspatch):
+        self.message = message
+        self.comments = comments
+        self.user = user
+        self.date = date
+        self.haspatch = haspatch
+
+    def setuser(self, user):
+        if not self.setheader(['From: ', '# User '], user):
+            try:
+                patchheaderat = self.comments.index('# HG changeset patch')
+                self.comments.insert(patchheaderat + 1,'# User ' + user)
+            except ValueError:
+                self.comments = ['From: ' + user, ''] + self.comments
+        self.user = user
+
+    def setdate(self, date):
+        if self.setheader(['# Date '], date):
+            self.date = date
+
+    def setmessage(self, message):
+        if self.comments:
+            self._delmsg()
+        self.message = [message]
+        self.comments += self.message
+
+    def setheader(self, prefixes, new):
+        '''Update all references to a field in the patch header.
+        If none found, add it email style.'''
+        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 __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 xrange(len(self.message)):
+            while self.message[mi] != self.comments[ci]:
+                ci += 1
+            del self.comments[ci]
+
 class queue:
     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 = []
         self.full_series = []
         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
 
         if os.path.exists(self.join(self.series_path)):
             self.full_series = self.opener(self.series_path).read().splitlines()
         self.parse_series()
 
         if os.path.exists(self.join(self.status_path)):
             lines = self.opener(self.status_path).read().splitlines()
             self.applied = [statusentry(l) for l in lines]
 
     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]
         for c in '-+':
             if first == c:
                 return (_('guard %r starts with invalid character: %r') %
                         (guard, c))
         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 = util.sort(util.unique(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 readheaders(self, patch):
         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
 
         pf = self.join(patch)
         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':
                 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)
-        return (message, comments, user, date, diffstart > 1)
+        return patchheader(message, comments, user, date, diffstart > 1)
 
     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(None, ctx.description(), ctx.user(), force=1)
         if n == None:
             raise util.Abort(_("repo commit failed"))
         try:
-            message, comments, user, date, patchfound = mergeq.readheaders(patch)
+            ph = mergeq.readheaders(patch)
         except:
             raise util.Abort(_("unable to read %s") % patch)
 
         patchf = self.opener(patch, "w")
+        comments = str(ph)
         if comments:
-            comments = "\n".join(comments) + '\n\n'
             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 == revlog.nullid:
                 return p1
             if len(self.applied) == 0:
                 return None
             return revlog.bin(self.applied[-1].rev)
         pp = repo.changelog.parents(rev)
         if pp[1] != revlog.nullid:
             arevs = [ x.rev for x in self.applied ]
             p0 = revlog.hex(pp[0])
             p1 = revlog.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(None, '[mq]: merge marker', user=None, force=1)
             self.removeundo(repo)
             self.applied.append(statusentry(revlog.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 = revlog.bin(info[1])
             (err, head) = self.mergeone(repo, mergeq, head, patch, rev)
             if head:
                 self.applied.append(statusentry(revlog.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: file name of patch'''
         files = {}
         try:
             fuzz = patch.patch(patchfile, self.ui, strip=1, cwd=repo.root,
                                files=files)
         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, lock, wlock
             self.removeundo(repo)
 
     def _apply(self, repo, series, list=False, update_status=True,
                strict=False, patchdir=None, merge=None, all_files={}):
         # 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.warn(_("applying %s\n") % patchname)
             pf = os.path.join(patchdir, patchname)
 
             try:
-                message, comments, user, date, patchfound = self.readheaders(patchname)
+                ph = self.readheaders(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)
 
             (patcherr, files, fuzz) = self.patch(repo, pf)
             all_files.update(files)
             patcherr = not patcherr
 
             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(files, message, user, date, match=match,
+            n = repo.commit(files, message, ph.user, ph.date, match=match,
                             force=True)
 
             if n == None:
                 raise util.Abort(_("repo commit failed"))
 
             if update_status:
                 self.applied.append(statusentry(revlog.hex(n), patchname))
 
             if patcherr:
-                if not patchfound:
+                if not ph.haspatch:
                     self.ui.warn(_("patch %s is empty\n") % patchname)
                     err = 0
                 else:
                     self.ui.warn(_("patch failed, rejects left in working dir\n"))
                     err = 1
                 break
 
             if fuzz and strict:
                 self.ui.warn(_("fuzz found when applying patch, stopping\n"))
                 err = 1
                 break
         return (err, n)
 
     def _clean_series(self, patches):
         indices = util.sort([self.find_series(p) for p in patches])
         for i in indices[-1::-1]:
             del self.full_series[i]
         self.parse_series()
         self.series_dirty = 1
 
     def finish(self, repo, revs):
         revs.sort()
         firstrev = repo[self.applied[0].rev].rev()
         appliedbase = 0
         patches = []
         for rev in util.sort(revs):
             if rev < firstrev:
                 raise util.Abort(_('revision %d is not managed') % rev)
             base = revlog.bin(self.applied[appliedbase].rev)
             node = repo.changelog.node(rev)
             if node != base:
                 raise util.Abort(_('cannot delete revision %d above '
                                    'applied patches') % rev)
             patches.append(self.applied[appliedbase].name)
             appliedbase += 1
 
         r = self.qrepo()
         if r:
             r.remove(patches, True)
         else:
             for p in patches:
                 os.unlink(self.join(p))
 
         del self.applied[:appliedbase]
         self.applied_dirty = 1
         self._clean_series(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)
 
         appliedbase = 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()
             for rev in revs:
                 if appliedbase >= len(self.applied):
                     raise util.Abort(_("revision %d is not managed") % rev)
 
                 base = revlog.bin(self.applied[appliedbase].rev)
                 node = repo.changelog.node(rev)
                 if node != base:
                     raise util.Abort(_("cannot delete revision %d above "
                                        "applied patches") % rev)
                 realpatches.append(self.applied[appliedbase].name)
                 appliedbase += 1
 
         if not opts.get('keep'):
             r = self.qrepo()
             if r:
                 r.remove(realpatches, True)
             else:
                 for p in realpatches:
                     os.unlink(self.join(p))
 
         if appliedbase:
             del self.applied[:appliedbase]
             self.applied_dirty = 1
         self._clean_series(realpatches)
 
     def check_toppatch(self, repo):
         if len(self.applied) > 0:
             top = revlog.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 callable(msg):
                     msg = msg()
                 commitmsg = msg and msg or ("[mq]: %s" % patchfn)
                 n = repo.commit(commitfiles, commitmsg, user, date, match=match, force=True)
                 if n == None:
                     raise util.Abort(_("repo commit failed"))
                 try:
                     self.full_series[insert:insert] = [patchfn]
                     self.applied.append(statusentry(revlog.hex(n), patchfn))
                     self.parse_series()
                     self.series_dirty = 1
                     self.applied_dirty = 1
                     if msg:
                         msg = msg + "\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 = 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:
             del 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:
             del lock, wlock
 
     def isapplied(self, patch):
         """returns (index, rev, patch)"""
         for i in xrange(len(self.applied)):
             a = self.applied[i]
             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 == None:
             return None
 
         # we don't want to return a partial match until we make
         # sure the file name passed in does not exist (checked below)
         res = partial_name(patch)
         if res and res == patch:
             return res
 
         if not os.path.isfile(self.join(patch)):
             try:
                 sno = int(patch)
             except(ValueError, OverflowError):
                 pass
             else:
                 if sno < len(self.series):
                     return self.series[sno]
             if not strict:
                 # return any partial match made above
                 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()
         if repo.dirstate.parents()[0] != repo.changelog.tip():
             self.ui.status(_("(working directory not at tip)\n"))
 
         if not self.series:
             self.ui.warn(_('no patches in series\n'))
             return 0
 
         try:
             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]:
                 self.ui.write(
                     "Errors during apply, please fix and refresh %s\n" % top)
             else:
                 self.ui.write("Now at: %s\n" % top)
             return ret[0]
         finally:
             del wlock
 
     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 not update:
                 parents = repo.dirstate.parents()
                 rr = [ revlog.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
 
             if not force and update:
                 self.check_localchanges(repo)
 
             self.applied_dirty = 1;
             end = len(self.applied)
             if not patch:
                 if all:
                     popi = 0
                 else:
                     popi = len(self.applied) - 1
             else:
                 popi = info[0] + 1
                 if popi >= end:
                     self.ui.warn(_("qpop: %s is already at the top\n") % patch)
                     return
             info = [ popi ] + [self.applied[popi].rev, self.applied[popi].name]
 
             start = info[0]
             rev = revlog.bin(info[1])
 
             if update:
                 top = self.check_toppatch(repo)
 
             if repo.changelog.heads(rev) != [revlog.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, revlog.nullid)
             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:
             del wlock
 
     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 = revlog.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)
-            message, comments, user, date, patchfound = self.readheaders(patchfn)
+            ph = self.readheaders(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
 
-            msg = opts.get('msg', '').rstrip()
-            if msg and comments:
-                # Remove existing message, keeping the rest of the comments
-                # fields.
-                # If comments contains 'subject: ', message will prepend
-                # the field and a blank line.
-                if message:
-                    subj = 'subject: ' + message[0].lower()
-                    for i in xrange(len(comments)):
-                        if subj == comments[i].lower():
-                            del comments[i]
-                            message = message[2:]
-                            break
-                ci = 0
-                for mi in xrange(len(message)):
-                    while message[mi] != comments[ci]:
-                        ci += 1
-                    del comments[ci]
-
-            def setheaderfield(comments, prefixes, new):
-                # Update all references to a field in the patch header.
-                # If none found, add it email style.
-                res = False
-                for prefix in prefixes:
-                    for i in xrange(len(comments)):
-                        if comments[i].startswith(prefix):
-                            comments[i] = prefix + new
-                            res = True
-                            break
-                return res
-
-            newuser = opts.get('user')
+            if msg:
+                ph.setmessage(msg)
             if newuser:
-                if not setheaderfield(comments, ['From: ', '# User '], newuser):
-                    try:
-                        patchheaderat = comments.index('# HG changeset patch')
-                        comments.insert(patchheaderat + 1,'# User ' + newuser)
-                    except ValueError:
-                        comments = ['From: ' + newuser, ''] + comments
-                user = newuser
-
+                ph.setuser(newuser)
             if newdate:
-                if setheaderfield(comments, ['# Date '], newdate):
-                    date = newdate
-
-            if msg:
-                comments.append(msg)
+                ph.setdate(newdate)
 
             patchf.seek(0)
             patchf.truncate()
 
+            comments = str(ph)
             if comments:
-                comments = "\n".join(comments) + '\n\n'
                 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 = util.unique(mm)
                 r = util.unique(dd)
                 a = util.unique(aa)
                 c = [filter(matchfn, l) for l in (m, a, r)]
                 match = cmdutil.matchfiles(repo, util.unique(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)
                 patchf.close()
 
                 repo.dirstate.setparents(*cparents)
                 copies = {}
                 for dst in a:
                     src = repo.dirstate.copied(dst)
                     if src is not None:
                         copies.setdefault(src, []).append(dst)
                     repo.dirstate.add(dst)
                 # remember the copies between patchparent and tip
                 # this may be slow, so don't do it if we're not tracking copies
                 if self.diffopts().git:
                     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)
                 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 message:
+                    if not ph.message:
                         message = "[mq]: %s\n" % patchfn
                     else:
-                        message = "\n".join(message)
+                        message = "\n".join(ph.message)
                 else:
                     message = msg
 
-                if not user:
-                    user = changes[1]
+                user = ph.user or changes[1]
 
                 self.applied.pop()
                 self.applied_dirty = 1
                 self.strip(repo, top, update=False,
                            backup='strip')
-                n = repo.commit(match.files(), message, user, date, match=match,
-                                force=1)
+                n = repo.commit(match.files(), message, user, ph.date,
+                                match=match, force=1)
                 self.applied.append(statusentry(revlog.hex(n), patchfn))
                 self.removeundo(repo)
             else:
                 self.printdiff(repo, patchparent, fp=patchf)
                 patchf.close()
                 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:
             del wlock
 
     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(patchname):
             if summary:
-                msg = self.readheaders(patchname)[0]
+                ph = self.readheaders(patchname)
+                msg = ph.message
                 msg = msg and ': ' + msg[0] or ': '
             else:
                 msg = ''
             return '%s%s' % (patchname, msg)
 
         applied = dict.fromkeys([p.name for p in self.applied])
         if length is None:
             length = len(self.series) - start
         if not missing:
             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 ' % (i, stat)
                 elif status and status != stat:
                     continue
                 self.ui.write('%s%s\n' % (pfx, displayname(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 util.sort(msng_list):
                 pfx = self.ui.verbose and ('D ') or ''
                 self.ui.write("%s%s\n" % (pfx, displayname(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 in xrange(0, len(lines)):
             if lines[i] == 'Patch Data:':
                 datastart = i + 1
             elif lines[i].startswith('Dirstate:'):
                 l = lines[i].rstrip()
                 l = l[10:].split(' ')
                 qpp = [ bin(x) for x in l ]
             elif datastart != None:
                 l = lines[i].rstrip()
                 se = statusentry(l)
                 file_ = se.name
                 if se.rev:
                     applied.append(se)
                 else:
                     series.append(file_)
         if datastart == 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(None, text, user=None, force=1)
         if not n:
             self.ui.warn(_("repo commit failed\n"))
             return 1
         self.applied.append(statusentry(revlog.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 == 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(lambda x, y: cmp(y, x))
         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 = revlog.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 != [revlog.bin(self.applied[-1].rev)]:
                     raise util.Abort(_('revision %d is not the parent of '
                                        'the queue') % rev[0])
                 base = repo.changelog.rev(revlog.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 != revlog.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(revlog.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 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, unless they are arguments to
     the --rev parameter. At least one patch or revision is required.
 
     With --rev, mq will stop managing the named revisions (converting
     them to regular mercurial changesets). The qfinish command should be
     used as an alternative for qdel -r, as the latter option is deprecated.
 
     With --keep, the patch files are preserved in the patch directory."""
     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
     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)
     return q.qseries(repo, length=end, 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)
     q.qseries(repo, start=start, 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 --name.
 
     You can register an existing patch inside the patch directory
     with the --existing flag.
 
     With --force, an existing patch of the same name will be overwritten.
 
     An existing changeset may be placed under mq control with --rev
     (e.g. qimport --rev tip -n patch will place tip under mq control).
     With --git, patches imported with --rev will use the git diff
     format. See the gitdiffs help topic for information on why this is
     important for preserving rename/copy information and permission changes.
     """
     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()
     return 0
 
 def init(ui, repo, **opts):
     """init a new queue repository
 
     The queue repository is unversioned by default. If -c 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'
     cmdutil.setremoteconfig(ui, opts)
     if dest is None:
         dest = hg.defaultdest(source)
     sr = hg.repository(ui, ui.expandpath(source))
     patchespath = opts['patches'] or patchdir(sr)
     try:
         pr = hg.repository(ui, patchespath)
     except RepoError:
         raise util.Abort(_('versioned patch repository not found'
                            ' (see qinit -c)'))
     qbase, destrev = None, None
     if sr.local():
         if sr.mq.applied:
             qbase = revlog.bin(sr.mq.applied[0].rev)
             if not hg.islocal(dest):
                 heads = dict.fromkeys(sr.heads())
                 for h in sr.heads(qbase):
                     del heads[h]
                 destrev = heads.keys()
                 destrev.append(sr.changelog.parents(qbase)[0])
     elif sr.capable('lookup'):
         try:
             qbase = sr.lookup('qbase')
         except RepoError:
             pass
     ui.note(_('cloning main repo\n'))
     sr, dr = hg.clone(ui, sr.url(), dest,
                       pull=opts['pull'],
                       rev=destrev,
                       update=False,
                       stream=opts['uncompressed'])
     ui.note(_('cloning patch repo\n'))
     spr, dpr = 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 repo\n'))
             dr.mq.strip(dr, qbase, update=False, backup=None)
         if not opts['noupdate']:
             ui.note(_('updating destination repo\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 is
     specified, in which case the patch will be initialized with them. You
     may also use -I, -X, 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 and -d can be used to set the (given) user and date, respectively.
     -U and -D set user to current user and date to current date.
 
     -e, -m or -l 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 --git option to keep the patch in the git extended diff format.
     Read the gitdiffs 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 --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 (--git or [diff] git=1) to track copies and renames.
     See the gitdiffs 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
-        (message, comment, user, date, hasdiff) = q.readheaders(patch)
-        message = ui.edit('\n'.join(message), user or ui.username())
+        ph = q.readheaders(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'))
 
     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:
-            messages.append(q.readheaders(p)[0])
+            ph = q.readheaders(p)
+            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:
-        message, comments, user = q.readheaders(parent)[0:3]
+        ph = q.readheaders(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.
 
     To set a negative guard "-foo" on topmost patch ("--" is needed so
     hg will not interpret "-foo" as an option):
       hg qguard -- -foo
 
     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')
-    message = repo.mq.readheaders(patch)[0]
+    ph = repo.mq.readheaders(patch)
 
-    ui.write('\n'.join(message) + '\n')
+    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 == 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 --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:
             del wlock
 
     q.save_dirty()
 
 def restore(ui, repo, rev, **opts):
     """restore the queue state saved by a rev"""
     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 dir'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] == revlog.nullid:
         update = False
     elif p[1] == revlog.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(lambda a, b: cmp(a[0][1:], b[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 --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__):
         def abort_if_wdir_patched(self, errmsg, force=False):
             if self.mq.applied and not force:
                 parent = revlog.hex(self.dirstate.parents()[0])
                 if parent in [s.rev for s in self.mq.applied]:
                     raise util.Abort(errmsg)
 
         def commit(self, *args, **opts):
             if len(args) >= 6:
                 force = args[5]
             else:
                 force = opts.get('force')
             self.abort_if_wdir_patched(
                 _('cannot commit over an applied mq patch'),
                 force)
 
             return super(mqrepo, self).commit(*args, **opts)
 
         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 tags(self):
             if self.tagscache:
                 return self.tagscache
 
             tagscache = super(mqrepo, self).tags()
 
             q = self.mq
             if not q.applied:
                 return tagscache
 
             mqtags = [(revlog.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')
                              % revlog.short(mqtags[-1][0]))
                 return tagscache
 
             mqtags.append((mqtags[-1][0], 'qtip'))
             mqtags.append((mqtags[0][0], 'qbase'))
             mqtags.append((self.changelog.parents(mqtags[0][0])[0], 'qparent'))
             for patch in mqtags:
                 if patch[1] in tagscache:
                     self.ui.warn(_('Tag %s overrides mq patch of the same name\n')
                                  % patch[1])
                 else:
                     tagscache[patch[1]] = patch[0]
 
             return tagscache
 
         def _branchtags(self, partial, lrev):
             q = self.mq
             if not q.applied:
                 return super(mqrepo, self)._branchtags(partial, lrev)
 
             cl = self.changelog
             qbasenode = revlog.bin(q.applied[0].rev)
             if qbasenode not in cl.nodemap:
                 self.ui.warn(_('mq status file refers to unknown node %s\n')
                              % revlog.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
         repo.mq = queue(ui, repo.join(""))
 
 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, [] + seriesopts, _('hg qapplied [-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 repo')),
          ] + 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'))],
          _('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 dir')),
           ('n', 'name', '', _('patch file name')),
           ('f', 'force', None, _('overwrite existing files')),
           ('r', 'rev', [], _('place existing revisions under mq control')),
           ('g', 'git', None, _('use git extended diff format'))],
          _('hg qimport [-e] [-n NAME] [-f] [-g] [-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 "From: <current user>" in patch')),
           ('u', 'user', '', _('add/update "From: <given user>" in patch')),
           ('D', 'currentdate', None, _('update "Date: <current date>" in patch (if present)')),
           ('d', 'date', '', _('update "Date: <given date>" in patch (if present)'))
           ] + 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 dir'))],
          _('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, [] + seriesopts, _('hg qunapplied [-s] [PATCH]')),
     "qfinish":
         (finish,
          [('a', 'applied', None, _('finish all applied changesets'))],
          _('hg qfinish [-a] [REV...]')),
 }