obsolete: add allowunstable option

This option allows the creation of unstable commits. This allows things like
amending in the middle of a stack of commits, etc.

hgext/histedit.py

@@ -1,945 +1,945 b''
 # histedit.py - interactive history editing for mercurial
 #
 # Copyright 2009 Augie Fackler <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 """interactive history editing
 
 With this extension installed, Mercurial gains one new command: histedit. Usage
 is as follows, assuming the following history::
 
  @  3[tip]   7c2fd3b9020c   2009-04-27 18:04 -0500   durin42
  |    Add delta
  |
  o  2   030b686bedc4   2009-04-27 18:04 -0500   durin42
  |    Add gamma
  |
  o  1   c561b4e977df   2009-04-27 18:04 -0500   durin42
  |    Add beta
  |
  o  0   d8d2fcd0e319   2009-04-27 18:04 -0500   durin42
       Add alpha
 
 If you were to run ``hg histedit c561b4e977df``, you would see the following
 file open in your editor::
 
  pick c561b4e977df Add beta
  pick 030b686bedc4 Add gamma
  pick 7c2fd3b9020c Add delta
 
  # Edit history between c561b4e977df and 7c2fd3b9020c
  #
  # Commits are listed from least to most recent
  #
  # Commands:
  #  p, pick = use commit
  #  e, edit = use commit, but stop for amending
  #  f, fold = use commit, but combine it with the one above
  #  r, roll = like fold, but discard this commit's description
  #  d, drop = remove commit from history
  #  m, mess = edit message without changing commit content
  #
 
 In this file, lines beginning with ``#`` are ignored. You must specify a rule
 for each revision in your history. For example, if you had meant to add gamma
 before beta, and then wanted to add delta in the same revision as beta, you
 would reorganize the file to look like this::
 
  pick 030b686bedc4 Add gamma
  pick c561b4e977df Add beta
  fold 7c2fd3b9020c Add delta
 
  # Edit history between c561b4e977df and 7c2fd3b9020c
  #
  # Commits are listed from least to most recent
  #
  # Commands:
  #  p, pick = use commit
  #  e, edit = use commit, but stop for amending
  #  f, fold = use commit, but combine it with the one above
  #  r, roll = like fold, but discard this commit's description
  #  d, drop = remove commit from history
  #  m, mess = edit message without changing commit content
  #
 
 At which point you close the editor and ``histedit`` starts working. When you
 specify a ``fold`` operation, ``histedit`` will open an editor when it folds
 those revisions together, offering you a chance to clean up the commit message::
 
  Add beta
  ***
  Add delta
 
 Edit the commit message to your liking, then close the editor. For
 this example, let's assume that the commit message was changed to
 ``Add beta and delta.`` After histedit has run and had a chance to
 remove any old or temporary revisions it needed, the history looks
 like this::
 
  @  2[tip]   989b4d060121   2009-04-27 18:04 -0500   durin42
  |    Add beta and delta.
  |
  o  1   081603921c3f   2009-04-27 18:04 -0500   durin42
  |    Add gamma
  |
  o  0   d8d2fcd0e319   2009-04-27 18:04 -0500   durin42
       Add alpha
 
 Note that ``histedit`` does *not* remove any revisions (even its own temporary
 ones) until after it has completed all the editing operations, so it will
 probably perform several strip operations when it's done. For the above example,
 it had to run strip twice. Strip can be slow depending on a variety of factors,
 so you might need to be a little patient. You can choose to keep the original
 revisions by passing the ``--keep`` flag.
 
 The ``edit`` operation will drop you back to a command prompt,
 allowing you to edit files freely, or even use ``hg record`` to commit
 some changes as a separate commit. When you're done, any remaining
 uncommitted changes will be committed as well. When done, run ``hg
 histedit --continue`` to finish this step. You'll be prompted for a
 new commit message, but the default commit message will be the
 original message for the ``edit`` ed revision.
 
 The ``message`` operation will give you a chance to revise a commit
 message without changing the contents. It's a shortcut for doing
 ``edit`` immediately followed by `hg histedit --continue``.
 
 If ``histedit`` encounters a conflict when moving a revision (while
 handling ``pick`` or ``fold``), it'll stop in a similar manner to
 ``edit`` with the difference that it won't prompt you for a commit
 message when done. If you decide at this point that you don't like how
 much work it will be to rearrange history, or that you made a mistake,
 you can use ``hg histedit --abort`` to abandon the new changes you
 have made and return to the state before you attempted to edit your
 history.
 
 If we clone the histedit-ed example repository above and add four more
 changes, such that we have the following history::
 
    @  6[tip]   038383181893   2009-04-27 18:04 -0500   stefan
    |    Add theta
    |
    o  5   140988835471   2009-04-27 18:04 -0500   stefan
    |    Add eta
    |
    o  4   122930637314   2009-04-27 18:04 -0500   stefan
    |    Add zeta
    |
    o  3   836302820282   2009-04-27 18:04 -0500   stefan
    |    Add epsilon
    |
    o  2   989b4d060121   2009-04-27 18:04 -0500   durin42
    |    Add beta and delta.
    |
    o  1   081603921c3f   2009-04-27 18:04 -0500   durin42
    |    Add gamma
    |
    o  0   d8d2fcd0e319   2009-04-27 18:04 -0500   durin42
         Add alpha
 
 If you run ``hg histedit --outgoing`` on the clone then it is the same
 as running ``hg histedit 836302820282``. If you need plan to push to a
 repository that Mercurial does not detect to be related to the source
 repo, you can add a ``--force`` option.
 """
 
 try:
     import cPickle as pickle
     pickle.dump # import now
 except ImportError:
     import pickle
 import errno
 import os
 import sys
 
 from mercurial import cmdutil
 from mercurial import discovery
 from mercurial import error
 from mercurial import copies
 from mercurial import context
 from mercurial import hg
 from mercurial import node
 from mercurial import repair
 from mercurial import scmutil
 from mercurial import util
 from mercurial import obsolete
 from mercurial import merge as mergemod
 from mercurial.lock import release
 from mercurial.i18n import _
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
 
 testedwith = 'internal'
 
 # i18n: command names and abbreviations must remain untranslated
 editcomment = _("""# Edit history between %s and %s
 #
 # Commits are listed from least to most recent
 #
 # Commands:
 #  p, pick = use commit
 #  e, edit = use commit, but stop for amending
 #  f, fold = use commit, but combine it with the one above
 #  r, roll = like fold, but discard this commit's description
 #  d, drop = remove commit from history
 #  m, mess = edit message without changing commit content
 #
 """)
 
 def commitfuncfor(repo, src):
     """Build a commit function for the replacement of <src>
 
     This function ensure we apply the same treatment to all changesets.
 
     - Add a 'histedit_source' entry in extra.
 
     Note that fold have its own separated logic because its handling is a bit
     different and not easily factored out of the fold method.
     """
     phasemin = src.phase()
     def commitfunc(**kwargs):
         phasebackup = repo.ui.backupconfig('phases', 'new-commit')
         try:
             repo.ui.setconfig('phases', 'new-commit', phasemin,
                               'histedit')
             extra = kwargs.get('extra', {}).copy()
             extra['histedit_source'] = src.hex()
             kwargs['extra'] = extra
             return repo.commit(**kwargs)
         finally:
             repo.ui.restoreconfig(phasebackup)
     return commitfunc
 
 def applychanges(ui, repo, ctx, opts):
     """Merge changeset from ctx (only) in the current working directory"""
     wcpar = repo.dirstate.parents()[0]
     if ctx.p1().node() == wcpar:
         # edition ar "in place" we do not need to make any merge,
         # just applies changes on parent for edition
         cmdutil.revert(ui, repo, ctx, (wcpar, node.nullid), all=True)
         stats = None
     else:
         try:
             # ui.forcemerge is an internal variable, do not document
             repo.ui.setconfig('ui', 'forcemerge', opts.get('tool', ''),
                               'histedit')
             stats = mergemod.graft(repo, ctx, ctx.p1(), ['local', 'histedit'])
         finally:
             repo.ui.setconfig('ui', 'forcemerge', '', 'histedit')
     return stats
 
 def collapse(repo, first, last, commitopts):
     """collapse the set of revisions from first to last as new one.
 
     Expected commit options are:
         - message
         - date
         - username
     Commit message is edited in all cases.
 
     This function works in memory."""
     ctxs = list(repo.set('%d::%d', first, last))
     if not ctxs:
         return None
     base = first.parents()[0]
 
     # commit a new version of the old changeset, including the update
     # collect all files which might be affected
     files = set()
     for ctx in ctxs:
         files.update(ctx.files())
 
     # Recompute copies (avoid recording a -> b -> a)
     copied = copies.pathcopies(base, last)
 
     # prune files which were reverted by the updates
     def samefile(f):
         if f in last.manifest():
             a = last.filectx(f)
             if f in base.manifest():
                 b = base.filectx(f)
                 return (a.data() == b.data()
                         and a.flags() == b.flags())
             else:
                 return False
         else:
             return f not in base.manifest()
     files = [f for f in files if not samefile(f)]
     # commit version of these files as defined by head
     headmf = last.manifest()
     def filectxfn(repo, ctx, path):
         if path in headmf:
             fctx = last[path]
             flags = fctx.flags()
             mctx = context.memfilectx(repo,
                                       fctx.path(), fctx.data(),
                                       islink='l' in flags,
                                       isexec='x' in flags,
                                       copied=copied.get(path))
             return mctx
         return None
 
     if commitopts.get('message'):
         message = commitopts['message']
     else:
         message = first.description()
     user = commitopts.get('user')
     date = commitopts.get('date')
     extra = commitopts.get('extra')
 
     parents = (first.p1().node(), first.p2().node())
     editor = None
     if not commitopts.get('rollup'):
         editor = cmdutil.getcommiteditor(edit=True, editform='histedit.fold')
     new = context.memctx(repo,
                          parents=parents,
                          text=message,
                          files=files,
                          filectxfn=filectxfn,
                          user=user,
                          date=date,
                          extra=extra,
                          editor=editor)
     return repo.commitctx(new)
 
 def pick(ui, repo, ctx, ha, opts):
     oldctx = repo[ha]
     if oldctx.parents()[0] == ctx:
         ui.debug('node %s unchanged\n' % ha)
         return oldctx, []
     hg.update(repo, ctx.node())
     stats = applychanges(ui, repo, oldctx, opts)
     if stats and stats[3] > 0:
         raise error.InterventionRequired(_('Fix up the change and run '
                                            'hg histedit --continue'))
     # drop the second merge parent
     commit = commitfuncfor(repo, oldctx)
     n = commit(text=oldctx.description(), user=oldctx.user(),
                date=oldctx.date(), extra=oldctx.extra())
     if n is None:
         ui.warn(_('%s: empty changeset\n')
                      % node.hex(ha))
         return ctx, []
     new = repo[n]
     return new, [(oldctx.node(), (n,))]
 
 
 def edit(ui, repo, ctx, ha, opts):
     oldctx = repo[ha]
     hg.update(repo, ctx.node())
     applychanges(ui, repo, oldctx, opts)
     raise error.InterventionRequired(
         _('Make changes as needed, you may commit or record as needed now.\n'
           'When you are finished, run hg histedit --continue to resume.'))
 
 def rollup(ui, repo, ctx, ha, opts):
     rollupopts = opts.copy()
     rollupopts['rollup'] = True
     return fold(ui, repo, ctx, ha, rollupopts)
 
 def fold(ui, repo, ctx, ha, opts):
     oldctx = repo[ha]
     hg.update(repo, ctx.node())
     stats = applychanges(ui, repo, oldctx, opts)
     if stats and stats[3] > 0:
         raise error.InterventionRequired(
             _('Fix up the change and run hg histedit --continue'))
     n = repo.commit(text='fold-temp-revision %s' % ha, user=oldctx.user(),
                     date=oldctx.date(), extra=oldctx.extra())
     if n is None:
         ui.warn(_('%s: empty changeset')
                      % node.hex(ha))
         return ctx, []
     return finishfold(ui, repo, ctx, oldctx, n, opts, [])
 
 def finishfold(ui, repo, ctx, oldctx, newnode, opts, internalchanges):
     parent = ctx.parents()[0].node()
     hg.update(repo, parent)
     ### prepare new commit data
     commitopts = opts.copy()
     commitopts['user'] = ctx.user()
     # commit message
     if opts.get('rollup'):
         newmessage = ctx.description()
     else:
         newmessage = '\n***\n'.join(
             [ctx.description()] +
             [repo[r].description() for r in internalchanges] +
             [oldctx.description()]) + '\n'
     commitopts['message'] = newmessage
     # date
     commitopts['date'] = max(ctx.date(), oldctx.date())
     extra = ctx.extra().copy()
     # histedit_source
     # note: ctx is likely a temporary commit but that the best we can do here
     #       This is sufficient to solve issue3681 anyway
     extra['histedit_source'] = '%s,%s' % (ctx.hex(), oldctx.hex())
     commitopts['extra'] = extra
     phasebackup = repo.ui.backupconfig('phases', 'new-commit')
     try:
         phasemin = max(ctx.phase(), oldctx.phase())
         repo.ui.setconfig('phases', 'new-commit', phasemin, 'histedit')
         n = collapse(repo, ctx, repo[newnode], commitopts)
     finally:
         repo.ui.restoreconfig(phasebackup)
     if n is None:
         return ctx, []
     hg.update(repo, n)
     replacements = [(oldctx.node(), (newnode,)),
                      (ctx.node(), (n,)),
                      (newnode, (n,)),
                     ]
     for ich in internalchanges:
         replacements.append((ich, (n,)))
     return repo[n], replacements
 
 def drop(ui, repo, ctx, ha, opts):
     return ctx, [(repo[ha].node(), ())]
 
 
 def message(ui, repo, ctx, ha, opts):
     oldctx = repo[ha]
     hg.update(repo, ctx.node())
     stats = applychanges(ui, repo, oldctx, opts)
     if stats and stats[3] > 0:
         raise error.InterventionRequired(
             _('Fix up the change and run hg histedit --continue'))
     message = oldctx.description()
     commit = commitfuncfor(repo, oldctx)
     editor = cmdutil.getcommiteditor(edit=True, editform='histedit.mess')
     new = commit(text=message, user=oldctx.user(), date=oldctx.date(),
                  extra=oldctx.extra(),
                  editor=editor)
     newctx = repo[new]
     if oldctx.node() != newctx.node():
         return newctx, [(oldctx.node(), (new,))]
     # We didn't make an edit, so just indicate no replaced nodes
     return newctx, []
 
 def findoutgoing(ui, repo, remote=None, force=False, opts={}):
     """utility function to find the first outgoing changeset
 
     Used by initialisation code"""
     dest = ui.expandpath(remote or 'default-push', remote or 'default')
     dest, revs = hg.parseurl(dest, None)[:2]
     ui.status(_('comparing with %s\n') % util.hidepassword(dest))
 
     revs, checkout = hg.addbranchrevs(repo, repo, revs, None)
     other = hg.peer(repo, opts, dest)
 
     if revs:
         revs = [repo.lookup(rev) for rev in revs]
 
     outgoing = discovery.findcommonoutgoing(repo, other, revs, force=force)
     if not outgoing.missing:
         raise util.Abort(_('no outgoing ancestors'))
     roots = list(repo.revs("roots(%ln)", outgoing.missing))
     if 1 < len(roots):
         msg = _('there are ambiguous outgoing revisions')
         hint = _('see "hg help histedit" for more detail')
         raise util.Abort(msg, hint=hint)
     return repo.lookup(roots[0])
 
 actiontable = {'p': pick,
                'pick': pick,
                'e': edit,
                'edit': edit,
                'f': fold,
                'fold': fold,
                'r': rollup,
                'roll': rollup,
                'd': drop,
                'drop': drop,
                'm': message,
                'mess': message,
                }
 
 @command('histedit',
     [('', 'commands', '',
       _('Read history edits from the specified file.')),
      ('c', 'continue', False, _('continue an edit already in progress')),
      ('k', 'keep', False,
       _("don't strip old nodes after edit is complete")),
      ('', 'abort', False, _('abort an edit in progress')),
      ('o', 'outgoing', False, _('changesets not found in destination')),
      ('f', 'force', False,
       _('force outgoing even for unrelated repositories')),
      ('r', 'rev', [], _('first revision to be edited'))],
      _("ANCESTOR | --outgoing [URL]"))
 def histedit(ui, repo, *freeargs, **opts):
     """interactively edit changeset history
 
     This command edits changesets between ANCESTOR and the parent of
     the working directory.
 
     With --outgoing, this edits changesets not found in the
     destination repository. If URL of the destination is omitted, the
     'default-push' (or 'default') path will be used.
 
     For safety, this command is aborted, also if there are ambiguous
     outgoing revisions which may confuse users: for example, there are
     multiple branches containing outgoing revisions.
 
     Use "min(outgoing() and ::.)" or similar revset specification
     instead of --outgoing to specify edit target revision exactly in
     such ambiguous situation. See :hg:`help revsets` for detail about
     selecting revisions.
 
     Returns 0 on success, 1 if user intervention is required (not only
     for intentional "edit" command, but also for resolving unexpected
     conflicts).
     """
     lock = wlock = None
     try:
         wlock = repo.wlock()
         lock = repo.lock()
         _histedit(ui, repo, *freeargs, **opts)
     finally:
         release(lock, wlock)
 
 def _histedit(ui, repo, *freeargs, **opts):
     # TODO only abort if we try and histedit mq patches, not just
     # blanket if mq patches are applied somewhere
     mq = getattr(repo, 'mq', None)
     if mq and mq.applied:
         raise util.Abort(_('source has mq patches applied'))
 
     # basic argument incompatibility processing
     outg = opts.get('outgoing')
     cont = opts.get('continue')
     abort = opts.get('abort')
     force = opts.get('force')
     rules = opts.get('commands', '')
     revs = opts.get('rev', [])
     goal = 'new' # This invocation goal, in new, continue, abort
     if force and not outg:
         raise util.Abort(_('--force only allowed with --outgoing'))
     if cont:
         if util.any((outg, abort, revs, freeargs, rules)):
             raise util.Abort(_('no arguments allowed with --continue'))
         goal = 'continue'
     elif abort:
         if util.any((outg, revs, freeargs, rules)):
             raise util.Abort(_('no arguments allowed with --abort'))
         goal = 'abort'
     else:
         if os.path.exists(os.path.join(repo.path, 'histedit-state')):
             raise util.Abort(_('history edit already in progress, try '
                                '--continue or --abort'))
         if outg:
             if revs:
                 raise util.Abort(_('no revisions allowed with --outgoing'))
             if len(freeargs) > 1:
                 raise util.Abort(
                     _('only one repo argument allowed with --outgoing'))
         else:
             revs.extend(freeargs)
             if len(revs) != 1:
                 raise util.Abort(
                     _('histedit requires exactly one ancestor revision'))
 
 
     if goal == 'continue':
         (parentctxnode, rules, keep, topmost, replacements) = readstate(repo)
         parentctx = repo[parentctxnode]
         parentctx, repl = bootstrapcontinue(ui, repo, parentctx, rules, opts)
         replacements.extend(repl)
     elif goal == 'abort':
         (parentctxnode, rules, keep, topmost, replacements) = readstate(repo)
         mapping, tmpnodes, leafs, _ntm = processreplacement(repo, replacements)
         ui.debug('restore wc to old parent %s\n' % node.short(topmost))
         # check whether we should update away
         parentnodes = [c.node() for c in repo[None].parents()]
         for n in leafs | set([parentctxnode]):
             if n in parentnodes:
                 hg.clean(repo, topmost)
                 break
         else:
             pass
         cleanupnode(ui, repo, 'created', tmpnodes)
         cleanupnode(ui, repo, 'temp', leafs)
         os.unlink(os.path.join(repo.path, 'histedit-state'))
         return
     else:
         cmdutil.checkunfinished(repo)
         cmdutil.bailifchanged(repo)
 
         topmost, empty = repo.dirstate.parents()
         if outg:
             if freeargs:
                 remote = freeargs[0]
             else:
                 remote = None
             root = findoutgoing(ui, repo, remote, force, opts)
         else:
             rr = list(repo.set('roots(%ld)', scmutil.revrange(repo, revs)))
             if len(rr) != 1:
                 raise util.Abort(_('The specified revisions must have '
                     'exactly one common root'))
             root = rr[0].node()
 
         keep = opts.get('keep', False)
         revs = between(repo, root, topmost, keep)
         if not revs:
             raise util.Abort(_('%s is not an ancestor of working directory') %
                              node.short(root))
 
         ctxs = [repo[r] for r in revs]
         if not rules:
             rules = '\n'.join([makedesc(c) for c in ctxs])
             rules += '\n\n'
             rules += editcomment % (node.short(root), node.short(topmost))
             rules = ui.edit(rules, ui.username())
             # Save edit rules in .hg/histedit-last-edit.txt in case
             # the user needs to ask for help after something
             # surprising happens.
             f = open(repo.join('histedit-last-edit.txt'), 'w')
             f.write(rules)
             f.close()
         else:
             if rules == '-':
                 f = sys.stdin
             else:
                 f = open(rules)
             rules = f.read()
             f.close()
         rules = [l for l in (r.strip() for r in rules.splitlines())
                  if l and not l.startswith('#')]
         rules = verifyrules(rules, repo, ctxs)
 
         parentctx = repo[root].parents()[0]
         replacements = []
 
 
     while rules:
         writestate(repo, parentctx.node(), rules, keep, topmost, replacements)
         action, ha = rules.pop(0)
         ui.debug('histedit: processing %s %s\n' % (action, ha))
         actfunc = actiontable[action]
         parentctx, replacement_ = actfunc(ui, repo, parentctx, ha, opts)
         replacements.extend(replacement_)
 
     hg.update(repo, parentctx.node())
 
     mapping, tmpnodes, created, ntm = processreplacement(repo, replacements)
     if mapping:
         for prec, succs in mapping.iteritems():
             if not succs:
                 ui.debug('histedit: %s is dropped\n' % node.short(prec))
             else:
                 ui.debug('histedit: %s is replaced by %s\n' % (
                     node.short(prec), node.short(succs[0])))
                 if len(succs) > 1:
                     m = 'histedit:                            %s'
                     for n in succs[1:]:
                         ui.debug(m % node.short(n))
 
     if not keep:
         if mapping:
             movebookmarks(ui, repo, mapping, topmost, ntm)
             # TODO update mq state
         if obsolete.isenabled(repo, obsolete.createmarkersopt):
             markers = []
             # sort by revision number because it sound "right"
             for prec in sorted(mapping, key=repo.changelog.rev):
                 succs = mapping[prec]
                 markers.append((repo[prec],
                                 tuple(repo[s] for s in succs)))
             if markers:
                 obsolete.createmarkers(repo, markers)
         else:
             cleanupnode(ui, repo, 'replaced', mapping)
 
     cleanupnode(ui, repo, 'temp', tmpnodes)
     os.unlink(os.path.join(repo.path, 'histedit-state'))
     if os.path.exists(repo.sjoin('undo')):
         os.unlink(repo.sjoin('undo'))
 
 def gatherchildren(repo, ctx):
     # is there any new commit between the expected parent and "."
     #
     # note: does not take non linear new change in account (but previous
     #       implementation didn't used them anyway (issue3655)
     newchildren = [c.node() for c in repo.set('(%d::.)', ctx)]
     if ctx.node() != node.nullid:
         if not newchildren:
             # `ctx` should match but no result. This means that
             # currentnode is not a descendant from ctx.
             msg = _('%s is not an ancestor of working directory')
             hint = _('use "histedit --abort" to clear broken state')
             raise util.Abort(msg % ctx, hint=hint)
         newchildren.pop(0)  # remove ctx
     return newchildren
 
 def bootstrapcontinue(ui, repo, parentctx, rules, opts):
     action, currentnode = rules.pop(0)
     ctx = repo[currentnode]
 
     newchildren = gatherchildren(repo, parentctx)
 
     # Commit dirty working directory if necessary
     new = None
     s = repo.status()
     if s.modified or s.added or s.removed or s.deleted:
         # prepare the message for the commit to comes
         if action in ('f', 'fold', 'r', 'roll'):
             message = 'fold-temp-revision %s' % currentnode
         else:
             message = ctx.description()
         editopt = action in ('e', 'edit', 'm', 'mess')
         canonaction = {'e': 'edit', 'm': 'mess', 'p': 'pick'}
         editform = 'histedit.%s' % canonaction.get(action, action)
         editor = cmdutil.getcommiteditor(edit=editopt, editform=editform)
         commit = commitfuncfor(repo, ctx)
         new = commit(text=message, user=ctx.user(),
                      date=ctx.date(), extra=ctx.extra(),
                      editor=editor)
         if new is not None:
             newchildren.append(new)
 
     replacements = []
     # track replacements
     if ctx.node() not in newchildren:
         # note: new children may be empty when the changeset is dropped.
         # this happen e.g during conflicting pick where we revert content
         # to parent.
         replacements.append((ctx.node(), tuple(newchildren)))
 
     if action in ('f', 'fold', 'r', 'roll'):
         if newchildren:
             # finalize fold operation if applicable
             if new is None:
                 new = newchildren[-1]
             else:
                 newchildren.pop()  # remove new from internal changes
             foldopts = opts
             if action in ('r', 'roll'):
                 foldopts = foldopts.copy()
                 foldopts['rollup'] = True
             parentctx, repl = finishfold(ui, repo, parentctx, ctx, new,
                                          foldopts, newchildren)
             replacements.extend(repl)
         else:
             # newchildren is empty if the fold did not result in any commit
             # this happen when all folded change are discarded during the
             # merge.
             replacements.append((ctx.node(), (parentctx.node(),)))
     elif newchildren:
         # otherwise update "parentctx" before proceeding to further operation
         parentctx = repo[newchildren[-1]]
     return parentctx, replacements
 
 
 def between(repo, old, new, keep):
     """select and validate the set of revision to edit
 
     When keep is false, the specified set can't have children."""
     ctxs = list(repo.set('%n::%n', old, new))
     if ctxs and not keep:
-        if (not obsolete._enabled and
+        if (not obsolete.isenabled(repo, obsolete.allowunstableopt) and
             repo.revs('(%ld::) - (%ld)', ctxs, ctxs)):
             raise util.Abort(_('cannot edit history that would orphan nodes'))
         if repo.revs('(%ld) and merge()', ctxs):
             raise util.Abort(_('cannot edit history that contains merges'))
         root = ctxs[0] # list is already sorted by repo.set
         if not root.mutable():
             raise util.Abort(_('cannot edit immutable changeset: %s') % root)
     return [c.node() for c in ctxs]
 
 
 def writestate(repo, parentnode, rules, keep, topmost, replacements):
     fp = open(os.path.join(repo.path, 'histedit-state'), 'w')
     pickle.dump((parentnode, rules, keep, topmost, replacements), fp)
     fp.close()
 
 def readstate(repo):
     """Returns a tuple of (parentnode, rules, keep, topmost, replacements).
     """
     try:
         fp = open(os.path.join(repo.path, 'histedit-state'))
     except IOError, err:
         if err.errno != errno.ENOENT:
             raise
         raise util.Abort(_('no histedit in progress'))
     return pickle.load(fp)
 
 
 def makedesc(c):
     """build a initial action line for a ctx `c`
 
     line are in the form:
 
       pick <hash> <rev> <summary>
     """
     summary = ''
     if c.description():
         summary = c.description().splitlines()[0]
     line = 'pick %s %d %s' % (c, c.rev(), summary)
     # trim to 80 columns so it's not stupidly wide in my editor
     return util.ellipsis(line, 80)
 
 def verifyrules(rules, repo, ctxs):
     """Verify that there exists exactly one edit rule per given changeset.
 
     Will abort if there are to many or too few rules, a malformed rule,
     or a rule on a changeset outside of the user-given range.
     """
     parsed = []
     expected = set(str(c) for c in ctxs)
     seen = set()
     for r in rules:
         if ' ' not in r:
             raise util.Abort(_('malformed line "%s"') % r)
         action, rest = r.split(' ', 1)
         ha = rest.strip().split(' ', 1)[0]
         try:
             ha = str(repo[ha])  # ensure its a short hash
         except error.RepoError:
             raise util.Abort(_('unknown changeset %s listed') % ha)
         if ha not in expected:
             raise util.Abort(
                 _('may not use changesets other than the ones listed'))
         if ha in seen:
             raise util.Abort(_('duplicated command for changeset %s') % ha)
         seen.add(ha)
         if action not in actiontable:
             raise util.Abort(_('unknown action "%s"') % action)
         parsed.append([action, ha])
     missing = sorted(expected - seen)  # sort to stabilize output
     if missing:
         raise util.Abort(_('missing rules for changeset %s') % missing[0],
                          hint=_('do you want to use the drop action?'))
     return parsed
 
 def processreplacement(repo, replacements):
     """process the list of replacements to return
 
     1) the final mapping between original and created nodes
     2) the list of temporary node created by histedit
     3) the list of new commit created by histedit"""
     allsuccs = set()
     replaced = set()
     fullmapping = {}
     # initialise basic set
     # fullmapping record all operation recorded in replacement
     for rep in replacements:
         allsuccs.update(rep[1])
         replaced.add(rep[0])
         fullmapping.setdefault(rep[0], set()).update(rep[1])
     new = allsuccs - replaced
     tmpnodes = allsuccs & replaced
     # Reduce content fullmapping  into direct relation between original nodes
     # and final node created during history edition
     # Dropped changeset are replaced by an empty list
     toproceed = set(fullmapping)
     final = {}
     while toproceed:
         for x in list(toproceed):
             succs = fullmapping[x]
             for s in list(succs):
                 if s in toproceed:
                     # non final node with unknown closure
                     # We can't process this now
                     break
                 elif s in final:
                     # non final node, replace with closure
                     succs.remove(s)
                     succs.update(final[s])
             else:
                 final[x] = succs
                 toproceed.remove(x)
     # remove tmpnodes from final mapping
     for n in tmpnodes:
         del final[n]
     # we expect all changes involved in final to exist in the repo
     # turn `final` into list (topologically sorted)
     nm = repo.changelog.nodemap
     for prec, succs in final.items():
         final[prec] = sorted(succs, key=nm.get)
 
     # computed topmost element (necessary for bookmark)
     if new:
         newtopmost = sorted(new, key=repo.changelog.rev)[-1]
     elif not final:
         # Nothing rewritten at all. we won't need `newtopmost`
         # It is the same as `oldtopmost` and `processreplacement` know it
         newtopmost = None
     else:
         # every body died. The newtopmost is the parent of the root.
         newtopmost = repo[sorted(final, key=repo.changelog.rev)[0]].p1().node()
 
     return final, tmpnodes, new, newtopmost
 
 def movebookmarks(ui, repo, mapping, oldtopmost, newtopmost):
     """Move bookmark from old to newly created node"""
     if not mapping:
         # if nothing got rewritten there is not purpose for this function
         return
     moves = []
     for bk, old in sorted(repo._bookmarks.iteritems()):
         if old == oldtopmost:
             # special case ensure bookmark stay on tip.
             #
             # This is arguably a feature and we may only want that for the
             # active bookmark. But the behavior is kept compatible with the old
             # version for now.
             moves.append((bk, newtopmost))
             continue
         base = old
         new = mapping.get(base, None)
         if new is None:
             continue
         while not new:
             # base is killed, trying with parent
             base = repo[base].p1().node()
             new = mapping.get(base, (base,))
             # nothing to move
         moves.append((bk, new[-1]))
     if moves:
         marks = repo._bookmarks
         for mark, new in moves:
             old = marks[mark]
             ui.note(_('histedit: moving bookmarks %s from %s to %s\n')
                     % (mark, node.short(old), node.short(new)))
             marks[mark] = new
         marks.write()
 
 def cleanupnode(ui, repo, name, nodes):
     """strip a group of nodes from the repository
 
     The set of node to strip may contains unknown nodes."""
     ui.debug('should strip %s nodes %s\n' %
              (name, ', '.join([node.short(n) for n in nodes])))
     lock = None
     try:
         lock = repo.lock()
         # Find all node that need to be stripped
         # (we hg %lr instead of %ln to silently ignore unknown item
         nm = repo.changelog.nodemap
         nodes = sorted(n for n in nodes if n in nm)
         roots = [c.node() for c in repo.set("roots(%ln)", nodes)]
         for c in roots:
             # We should process node in reverse order to strip tip most first.
             # but this trigger a bug in changegroup hook.
             # This would reduce bundle overhead
             repair.strip(ui, repo, c)
     finally:
         release(lock)
 
 def summaryhook(ui, repo):
     if not os.path.exists(repo.join('histedit-state')):
         return
     (parentctxnode, rules, keep, topmost, replacements) = readstate(repo)
     if rules:
         # i18n: column positioning for "hg summary"
         ui.write(_('hist:   %s (histedit --continue)\n') %
                  (ui.label(_('%d remaining'), 'histedit.remaining') %
                   len(rules)))
 
 def extsetup(ui):
     cmdutil.summaryhooks.add('histedit', summaryhook)
     cmdutil.unfinishedstates.append(
         ['histedit-state', False, True, _('histedit in progress'),
          _("use 'hg histedit --continue' or 'hg histedit --abort'")])

hgext/rebase.py

@@ -1,1024 +1,1025 b''
 # rebase.py - rebasing feature for mercurial
 #
 # Copyright 2008 Stefano Tortarolo <stefano.tortarolo at gmail dot com>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 '''command to move sets of revisions to a different ancestor
 
 This extension lets you rebase changesets in an existing Mercurial
 repository.
 
 For more information:
 http://mercurial.selenic.com/wiki/RebaseExtension
 '''
 
 from mercurial import hg, util, repair, merge, cmdutil, commands, bookmarks
 from mercurial import extensions, patch, scmutil, phases, obsolete, error
 from mercurial import copies
 from mercurial.commands import templateopts
 from mercurial.node import nullrev
 from mercurial.lock import release
 from mercurial.i18n import _
 import os, errno
 
 nullmerge = -2
 revignored = -3
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
 testedwith = 'internal'
 
 def _savegraft(ctx, extra):
     s = ctx.extra().get('source', None)
     if s is not None:
         extra['source'] = s
 
 def _savebranch(ctx, extra):
     extra['branch'] = ctx.branch()
 
 def _makeextrafn(copiers):
     """make an extrafn out of the given copy-functions.
 
     A copy function takes a context and an extra dict, and mutates the
     extra dict as needed based on the given context.
     """
     def extrafn(ctx, extra):
         for c in copiers:
             c(ctx, extra)
     return extrafn
 
 @command('rebase',
     [('s', 'source', '',
      _('rebase the specified changeset and descendants'), _('REV')),
     ('b', 'base', '',
      _('rebase everything from branching point of specified changeset'),
      _('REV')),
     ('r', 'rev', [],
      _('rebase these revisions'),
      _('REV')),
     ('d', 'dest', '',
      _('rebase onto the specified changeset'), _('REV')),
     ('', 'collapse', False, _('collapse the rebased changesets')),
     ('m', 'message', '',
      _('use text as collapse commit message'), _('TEXT')),
     ('e', 'edit', False, _('invoke editor on commit messages')),
     ('l', 'logfile', '',
      _('read collapse commit message from file'), _('FILE')),
     ('', 'keep', False, _('keep original changesets')),
     ('', 'keepbranches', False, _('keep original branch names')),
     ('D', 'detach', False, _('(DEPRECATED)')),
     ('i', 'interactive', False, _('(DEPRECATED)')),
     ('t', 'tool', '', _('specify merge tool')),
     ('c', 'continue', False, _('continue an interrupted rebase')),
     ('a', 'abort', False, _('abort an interrupted rebase'))] +
      templateopts,
     _('[-s REV | -b REV] [-d REV] [OPTION]'))
 def rebase(ui, repo, **opts):
     """move changeset (and descendants) to a different branch
 
     Rebase uses repeated merging to graft changesets from one part of
     history (the source) onto another (the destination). This can be
     useful for linearizing *local* changes relative to a master
     development tree.
 
     You should not rebase changesets that have already been shared
     with others. Doing so will force everybody else to perform the
     same rebase or they will end up with duplicated changesets after
     pulling in your rebased changesets.
 
     In its default configuration, Mercurial will prevent you from
     rebasing published changes. See :hg:`help phases` for details.
 
     If you don't specify a destination changeset (``-d/--dest``),
     rebase uses the current branch tip as the destination. (The
     destination changeset is not modified by rebasing, but new
     changesets are added as its descendants.)
 
     You can specify which changesets to rebase in two ways: as a
     "source" changeset or as a "base" changeset. Both are shorthand
     for a topologically related set of changesets (the "source
     branch"). If you specify source (``-s/--source``), rebase will
     rebase that changeset and all of its descendants onto dest. If you
     specify base (``-b/--base``), rebase will select ancestors of base
     back to but not including the common ancestor with dest. Thus,
     ``-b`` is less precise but more convenient than ``-s``: you can
     specify any changeset in the source branch, and rebase will select
     the whole branch. If you specify neither ``-s`` nor ``-b``, rebase
     uses the parent of the working directory as the base.
 
     For advanced usage, a third way is available through the ``--rev``
     option. It allows you to specify an arbitrary set of changesets to
     rebase. Descendants of revs you specify with this option are not
     automatically included in the rebase.
 
     By default, rebase recreates the changesets in the source branch
     as descendants of dest and then destroys the originals. Use
     ``--keep`` to preserve the original source changesets. Some
     changesets in the source branch (e.g. merges from the destination
     branch) may be dropped if they no longer contribute any change.
 
     One result of the rules for selecting the destination changeset
     and source branch is that, unlike ``merge``, rebase will do
     nothing if you are at the branch tip of a named branch
     with two heads. You need to explicitly specify source and/or
     destination (or ``update`` to the other head, if it's the head of
     the intended source branch).
 
     If a rebase is interrupted to manually resolve a merge, it can be
     continued with --continue/-c or aborted with --abort/-a.
 
     .. container:: verbose
 
       Examples:
 
       - move "local changes" (current commit back to branching point)
         to the current branch tip after a pull::
 
           hg rebase
 
       - move a single changeset to the stable branch::
 
           hg rebase -r 5f493448 -d stable
 
       - splice a commit and all its descendants onto another part of history::
 
           hg rebase --source c0c3 --dest 4cf9
 
       - rebase everything on a branch marked by a bookmark onto the
         default branch::
 
           hg rebase --base myfeature --dest default
 
       - collapse a sequence of changes into a single commit::
 
           hg rebase --collapse -r 1520:1525 -d .
 
       - move a named branch while preserving its name::
 
           hg rebase -r "branch(featureX)" -d 1.3 --keepbranches
 
     Returns 0 on success, 1 if nothing to rebase or there are
     unresolved conflicts.
 
     """
     originalwd = target = None
     activebookmark = None
     external = nullrev
     state = {}
     skipped = set()
     targetancestors = set()
 
 
     lock = wlock = None
     try:
         wlock = repo.wlock()
         lock = repo.lock()
 
         # Validate input and define rebasing points
         destf = opts.get('dest', None)
         srcf = opts.get('source', None)
         basef = opts.get('base', None)
         revf = opts.get('rev', [])
         contf = opts.get('continue')
         abortf = opts.get('abort')
         collapsef = opts.get('collapse', False)
         collapsemsg = cmdutil.logmessage(ui, opts)
         e = opts.get('extrafn') # internal, used by e.g. hgsubversion
         extrafns = [_savegraft]
         if e:
             extrafns = [e]
         keepf = opts.get('keep', False)
         keepbranchesf = opts.get('keepbranches', False)
         # keepopen is not meant for use on the command line, but by
         # other extensions
         keepopen = opts.get('keepopen', False)
 
         if opts.get('interactive'):
             msg = _("interactive history editing is supported by the "
                     "'histedit' extension (see 'hg help histedit')")
             raise util.Abort(msg)
 
         if collapsemsg and not collapsef:
             raise util.Abort(
                 _('message can only be specified with collapse'))
 
         if contf or abortf:
             if contf and abortf:
                 raise util.Abort(_('cannot use both abort and continue'))
             if collapsef:
                 raise util.Abort(
                     _('cannot use collapse with continue or abort'))
             if srcf or basef or destf:
                 raise util.Abort(
                     _('abort and continue do not allow specifying revisions'))
             if opts.get('tool', False):
                 ui.warn(_('tool option will be ignored\n'))
 
             try:
                 (originalwd, target, state, skipped, collapsef, keepf,
                  keepbranchesf, external, activebookmark) = restorestatus(repo)
             except error.RepoLookupError:
                 if abortf:
                     clearstatus(repo)
                     repo.ui.warn(_('rebase aborted (no revision is removed,'
                                    ' only broken state is cleared)\n'))
                     return 0
                 else:
                     msg = _('cannot continue inconsistent rebase')
                     hint = _('use "hg rebase --abort" to clear broken state')
                     raise util.Abort(msg, hint=hint)
             if abortf:
                 return abort(repo, originalwd, target, state)
         else:
             if srcf and basef:
                 raise util.Abort(_('cannot specify both a '
                                    'source and a base'))
             if revf and basef:
                 raise util.Abort(_('cannot specify both a '
                                    'revision and a base'))
             if revf and srcf:
                 raise util.Abort(_('cannot specify both a '
                                    'revision and a source'))
 
             cmdutil.checkunfinished(repo)
             cmdutil.bailifchanged(repo)
 
             if not destf:
                 # Destination defaults to the latest revision in the
                 # current branch
                 branch = repo[None].branch()
                 dest = repo[branch]
             else:
                 dest = scmutil.revsingle(repo, destf)
 
             if revf:
                 rebaseset = scmutil.revrange(repo, revf)
                 if not rebaseset:
                     ui.status(_('empty "rev" revision set - '
                                 'nothing to rebase\n'))
                     return 1
             elif srcf:
                 src = scmutil.revrange(repo, [srcf])
                 if not src:
                     ui.status(_('empty "source" revision set - '
                                 'nothing to rebase\n'))
                     return 1
                 rebaseset = repo.revs('(%ld)::', src)
                 assert rebaseset
             else:
                 base = scmutil.revrange(repo, [basef or '.'])
                 if not base:
                     ui.status(_('empty "base" revision set - '
                                 "can't compute rebase set\n"))
                     return 1
                 rebaseset = repo.revs(
                     '(children(ancestor(%ld, %d)) and ::(%ld))::',
                     base, dest, base)
                 if not rebaseset:
                     # transform to list because smartsets are not comparable to
                     # lists. This should be improved to honor lazyness of
                     # smartset.
                     if list(base) == [dest.rev()]:
                         if basef:
                             ui.status(_('nothing to rebase - %s is both "base"'
                                         ' and destination\n') % dest)
                         else:
                             ui.status(_('nothing to rebase - working directory '
                                         'parent is also destination\n'))
                     elif not repo.revs('%ld - ::%d', base, dest):
                         if basef:
                             ui.status(_('nothing to rebase - "base" %s is '
                                         'already an ancestor of destination '
                                         '%s\n') %
                                       ('+'.join(str(repo[r]) for r in base),
                                        dest))
                         else:
                             ui.status(_('nothing to rebase - working '
                                         'directory parent is already an '
                                         'ancestor of destination %s\n') % dest)
                     else: # can it happen?
                         ui.status(_('nothing to rebase from %s to %s\n') %
                                   ('+'.join(str(repo[r]) for r in base), dest))
                     return 1
 
-            if (not (keepf or obsolete._enabled)
+            allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
+            if (not (keepf or allowunstable)
                   and repo.revs('first(children(%ld) - %ld)',
                                 rebaseset, rebaseset)):
                 raise util.Abort(
                     _("can't remove original changesets with"
                       " unrebased descendants"),
                     hint=_('use --keep to keep original changesets'))
 
             result = buildstate(repo, dest, rebaseset, collapsef)
             if not result:
                 # Empty state built, nothing to rebase
                 ui.status(_('nothing to rebase\n'))
                 return 1
 
             root = min(rebaseset)
             if not keepf and not repo[root].mutable():
                 raise util.Abort(_("can't rebase immutable changeset %s")
                                  % repo[root],
                                  hint=_('see hg help phases for details'))
 
             originalwd, target, state = result
             if collapsef:
                 targetancestors = repo.changelog.ancestors([target],
                                                            inclusive=True)
                 external = externalparent(repo, state, targetancestors)
 
             if dest.closesbranch() and not keepbranchesf:
                 ui.status(_('reopening closed branch head %s\n') % dest)
 
         if keepbranchesf:
             # insert _savebranch at the start of extrafns so if
             # there's a user-provided extrafn it can clobber branch if
             # desired
             extrafns.insert(0, _savebranch)
             if collapsef:
                 branches = set()
                 for rev in state:
                     branches.add(repo[rev].branch())
                     if len(branches) > 1:
                         raise util.Abort(_('cannot collapse multiple named '
                             'branches'))
 
         # Rebase
         if not targetancestors:
             targetancestors = repo.changelog.ancestors([target], inclusive=True)
 
         # Keep track of the current bookmarks in order to reset them later
         currentbookmarks = repo._bookmarks.copy()
         activebookmark = activebookmark or repo._bookmarkcurrent
         if activebookmark:
             bookmarks.unsetcurrent(repo)
 
         extrafn = _makeextrafn(extrafns)
 
         sortedstate = sorted(state)
         total = len(sortedstate)
         pos = 0
         for rev in sortedstate:
             pos += 1
             if state[rev] == -1:
                 ui.progress(_("rebasing"), pos, ("%d:%s" % (rev, repo[rev])),
                             _('changesets'), total)
                 p1, p2 = defineparents(repo, rev, target, state,
                                                         targetancestors)
                 storestatus(repo, originalwd, target, state, collapsef, keepf,
                             keepbranchesf, external, activebookmark)
                 if len(repo.parents()) == 2:
                     repo.ui.debug('resuming interrupted rebase\n')
                 else:
                     try:
                         ui.setconfig('ui', 'forcemerge', opts.get('tool', ''),
                                      'rebase')
                         stats = rebasenode(repo, rev, p1, state, collapsef,
                                            target)
                         if stats and stats[3] > 0:
                             raise error.InterventionRequired(
                                 _('unresolved conflicts (see hg '
                                   'resolve, then hg rebase --continue)'))
                     finally:
                         ui.setconfig('ui', 'forcemerge', '', 'rebase')
                 if not collapsef:
                     merging = repo[p2].rev() != nullrev
                     editform = cmdutil.mergeeditform(merging, 'rebase')
                     editor = cmdutil.getcommiteditor(editform=editform, **opts)
                     newrev = concludenode(repo, rev, p1, p2, extrafn=extrafn,
                                           editor=editor)
                 else:
                     # Skip commit if we are collapsing
                     repo.dirstate.beginparentchange()
                     repo.setparents(repo[p1].node())
                     repo.dirstate.endparentchange()
                     newrev = None
                 # Update the state
                 if newrev is not None:
                     state[rev] = repo[newrev].rev()
                 else:
                     if not collapsef:
                         ui.note(_('no changes, revision %d skipped\n') % rev)
                         ui.debug('next revision set to %s\n' % p1)
                         skipped.add(rev)
                     state[rev] = p1
 
         ui.progress(_('rebasing'), None)
         ui.note(_('rebase merging completed\n'))
 
         if collapsef and not keepopen:
             p1, p2 = defineparents(repo, min(state), target,
                                                         state, targetancestors)
             editopt = opts.get('edit')
             editform = 'rebase.collapse'
             if collapsemsg:
                 commitmsg = collapsemsg
             else:
                 commitmsg = 'Collapsed revision'
                 for rebased in state:
                     if rebased not in skipped and state[rebased] > nullmerge:
                         commitmsg += '\n* %s' % repo[rebased].description()
                 editopt = True
             editor = cmdutil.getcommiteditor(edit=editopt, editform=editform)
             newrev = concludenode(repo, rev, p1, external, commitmsg=commitmsg,
                                   extrafn=extrafn, editor=editor)
             for oldrev in state.iterkeys():
                 if state[oldrev] > nullmerge:
                     state[oldrev] = newrev
 
         if 'qtip' in repo.tags():
             updatemq(repo, state, skipped, **opts)
 
         if currentbookmarks:
             # Nodeids are needed to reset bookmarks
             nstate = {}
             for k, v in state.iteritems():
                 if v > nullmerge:
                     nstate[repo[k].node()] = repo[v].node()
             # XXX this is the same as dest.node() for the non-continue path --
             # this should probably be cleaned up
             targetnode = repo[target].node()
 
         # restore original working directory
         # (we do this before stripping)
         newwd = state.get(originalwd, originalwd)
         if newwd not in [c.rev() for c in repo[None].parents()]:
             ui.note(_("update back to initial working directory parent\n"))
             hg.updaterepo(repo, newwd, False)
 
         if not keepf:
             collapsedas = None
             if collapsef:
                 collapsedas = newrev
             clearrebased(ui, repo, state, skipped, collapsedas)
 
         if currentbookmarks:
             updatebookmarks(repo, targetnode, nstate, currentbookmarks)
             if activebookmark not in repo._bookmarks:
                 # active bookmark was divergent one and has been deleted
                 activebookmark = None
 
         clearstatus(repo)
         ui.note(_("rebase completed\n"))
         util.unlinkpath(repo.sjoin('undo'), ignoremissing=True)
         if skipped:
             ui.note(_("%d revisions have been skipped\n") % len(skipped))
 
         if (activebookmark and
             repo['.'].node() == repo._bookmarks[activebookmark]):
                 bookmarks.setcurrent(repo, activebookmark)
 
     finally:
         release(lock, wlock)
 
 def externalparent(repo, state, targetancestors):
     """Return the revision that should be used as the second parent
     when the revisions in state is collapsed on top of targetancestors.
     Abort if there is more than one parent.
     """
     parents = set()
     source = min(state)
     for rev in state:
         if rev == source:
             continue
         for p in repo[rev].parents():
             if (p.rev() not in state
                         and p.rev() not in targetancestors):
                 parents.add(p.rev())
     if not parents:
         return nullrev
     if len(parents) == 1:
         return parents.pop()
     raise util.Abort(_('unable to collapse on top of %s, there is more '
                        'than one external parent: %s') %
                      (max(targetancestors),
                       ', '.join(str(p) for p in sorted(parents))))
 
 def concludenode(repo, rev, p1, p2, commitmsg=None, editor=None, extrafn=None):
     'Commit the changes and store useful information in extra'
     try:
         repo.dirstate.beginparentchange()
         repo.setparents(repo[p1].node(), repo[p2].node())
         repo.dirstate.endparentchange()
         ctx = repo[rev]
         if commitmsg is None:
             commitmsg = ctx.description()
         extra = {'rebase_source': ctx.hex()}
         if extrafn:
             extrafn(ctx, extra)
 
         backup = repo.ui.backupconfig('phases', 'new-commit')
         try:
             targetphase = max(ctx.phase(), phases.draft)
             repo.ui.setconfig('phases', 'new-commit', targetphase, 'rebase')
             # Commit might fail if unresolved files exist
             newrev = repo.commit(text=commitmsg, user=ctx.user(),
                                  date=ctx.date(), extra=extra, editor=editor)
         finally:
             repo.ui.restoreconfig(backup)
 
         repo.dirstate.setbranch(repo[newrev].branch())
         return newrev
     except util.Abort:
         # Invalidate the previous setparents
         repo.dirstate.invalidate()
         raise
 
 def rebasenode(repo, rev, p1, state, collapse, target):
     'Rebase a single revision'
     # Merge phase
     # Update to target and merge it with local
     if repo['.'].rev() != repo[p1].rev():
         repo.ui.debug(" update to %d:%s\n" % (repo[p1].rev(), repo[p1]))
         merge.update(repo, p1, False, True, False)
     else:
         repo.ui.debug(" already in target\n")
     repo.dirstate.write()
     repo.ui.debug(" merge against %d:%s\n" % (repo[rev].rev(), repo[rev]))
     if repo[rev].rev() == repo[min(state)].rev():
         # Case (1) initial changeset of a non-detaching rebase.
         # Let the merge mechanism find the base itself.
         base = None
     elif not repo[rev].p2():
         # Case (2) detaching the node with a single parent, use this parent
         base = repo[rev].p1().node()
     else:
         # In case of merge, we need to pick the right parent as merge base.
         #
         # Imagine we have:
         # - M: currently rebase revision in this step
         # - A: one parent of M
         # - B: second parent of M
         # - D: destination of this merge step (p1 var)
         #
         # If we are rebasing on D, D is the successors of A or B. The right
         # merge base is the one D succeed to. We pretend it is B for the rest
         # of this comment
         #
         # If we pick B as the base, the merge involves:
         # - changes from B to M (actual changeset payload)
         # - changes from B to D (induced by rebase) as D is a rebased
         #   version of B)
         # Which exactly represent the rebase operation.
         #
         # If we pick the A as the base, the merge involves
         # - changes from A to M (actual changeset payload)
         # - changes from A to D (with include changes between unrelated A and B
         #   plus changes induced by rebase)
         # Which does not represent anything sensible and creates a lot of
         # conflicts.
         for p in repo[rev].parents():
             if state.get(p.rev()) == repo[p1].rev():
                 base = p.node()
                 break
         else: # fallback when base not found
             base = None
 
             # Raise because this function is called wrong (see issue 4106)
             raise AssertionError('no base found to rebase on '
                                  '(rebasenode called wrong)')
     if base is not None:
         repo.ui.debug("   detach base %d:%s\n" % (repo[base].rev(), repo[base]))
     # When collapsing in-place, the parent is the common ancestor, we
     # have to allow merging with it.
     stats = merge.update(repo, rev, True, True, False, base, collapse,
                         labels=['dest', 'source'])
     if collapse:
         copies.duplicatecopies(repo, rev, target)
     else:
         # If we're not using --collapse, we need to
         # duplicate copies between the revision we're
         # rebasing and its first parent, but *not*
         # duplicate any copies that have already been
         # performed in the destination.
         p1rev = repo[rev].p1().rev()
         copies.duplicatecopies(repo, rev, p1rev, skiprev=target)
     return stats
 
 def nearestrebased(repo, rev, state):
     """return the nearest ancestors of rev in the rebase result"""
     rebased = [r for r in state if state[r] > nullmerge]
     candidates = repo.revs('max(%ld  and (::%d))', rebased, rev)
     if candidates:
         return state[candidates.first()]
     else:
         return None
 
 def defineparents(repo, rev, target, state, targetancestors):
     'Return the new parent relationship of the revision that will be rebased'
     parents = repo[rev].parents()
     p1 = p2 = nullrev
 
     p1n = parents[0].rev()
     if p1n in targetancestors:
         p1 = target
     elif p1n in state:
         if state[p1n] == nullmerge:
             p1 = target
         elif state[p1n] == revignored:
             p1 = nearestrebased(repo, p1n, state)
             if p1 is None:
                 p1 = target
         else:
             p1 = state[p1n]
     else: # p1n external
         p1 = target
         p2 = p1n
 
     if len(parents) == 2 and parents[1].rev() not in targetancestors:
         p2n = parents[1].rev()
         # interesting second parent
         if p2n in state:
             if p1 == target: # p1n in targetancestors or external
                 p1 = state[p2n]
             elif state[p2n] == revignored:
                 p2 = nearestrebased(repo, p2n, state)
                 if p2 is None:
                     # no ancestors rebased yet, detach
                     p2 = target
             else:
                 p2 = state[p2n]
         else: # p2n external
             if p2 != nullrev: # p1n external too => rev is a merged revision
                 raise util.Abort(_('cannot use revision %d as base, result '
                         'would have 3 parents') % rev)
             p2 = p2n
     repo.ui.debug(" future parents are %d and %d\n" %
                             (repo[p1].rev(), repo[p2].rev()))
     return p1, p2
 
 def isagitpatch(repo, patchname):
     'Return true if the given patch is in git format'
     mqpatch = os.path.join(repo.mq.path, patchname)
     for line in patch.linereader(file(mqpatch, 'rb')):
         if line.startswith('diff --git'):
             return True
     return False
 
 def updatemq(repo, state, skipped, **opts):
     'Update rebased mq patches - finalize and then import them'
     mqrebase = {}
     mq = repo.mq
     original_series = mq.fullseries[:]
     skippedpatches = set()
 
     for p in mq.applied:
         rev = repo[p.node].rev()
         if rev in state:
             repo.ui.debug('revision %d is an mq patch (%s), finalize it.\n' %
                                         (rev, p.name))
             mqrebase[rev] = (p.name, isagitpatch(repo, p.name))
         else:
             # Applied but not rebased, not sure this should happen
             skippedpatches.add(p.name)
 
     if mqrebase:
         mq.finish(repo, mqrebase.keys())
 
         # We must start import from the newest revision
         for rev in sorted(mqrebase, reverse=True):
             if rev not in skipped:
                 name, isgit = mqrebase[rev]
                 repo.ui.debug('import mq patch %d (%s)\n' % (state[rev], name))
                 mq.qimport(repo, (), patchname=name, git=isgit,
                                 rev=[str(state[rev])])
             else:
                 # Rebased and skipped
                 skippedpatches.add(mqrebase[rev][0])
 
         # Patches were either applied and rebased and imported in
         # order, applied and removed or unapplied. Discard the removed
         # ones while preserving the original series order and guards.
         newseries = [s for s in original_series
                      if mq.guard_re.split(s, 1)[0] not in skippedpatches]
         mq.fullseries[:] = newseries
         mq.seriesdirty = True
         mq.savedirty()
 
 def updatebookmarks(repo, targetnode, nstate, originalbookmarks):
     'Move bookmarks to their correct changesets, and delete divergent ones'
     marks = repo._bookmarks
     for k, v in originalbookmarks.iteritems():
         if v in nstate:
             # update the bookmarks for revs that have moved
             marks[k] = nstate[v]
             bookmarks.deletedivergent(repo, [targetnode], k)
 
     marks.write()
 
 def storestatus(repo, originalwd, target, state, collapse, keep, keepbranches,
                 external, activebookmark):
     'Store the current status to allow recovery'
     f = repo.opener("rebasestate", "w")
     f.write(repo[originalwd].hex() + '\n')
     f.write(repo[target].hex() + '\n')
     f.write(repo[external].hex() + '\n')
     f.write('%d\n' % int(collapse))
     f.write('%d\n' % int(keep))
     f.write('%d\n' % int(keepbranches))
     f.write('%s\n' % (activebookmark or ''))
     for d, v in state.iteritems():
         oldrev = repo[d].hex()
         if v > nullmerge:
             newrev = repo[v].hex()
         else:
             newrev = v
         f.write("%s:%s\n" % (oldrev, newrev))
     f.close()
     repo.ui.debug('rebase status stored\n')
 
 def clearstatus(repo):
     'Remove the status files'
     util.unlinkpath(repo.join("rebasestate"), ignoremissing=True)
 
 def restorestatus(repo):
     'Restore a previously stored status'
     try:
         keepbranches = None
         target = None
         collapse = False
         external = nullrev
         activebookmark = None
         state = {}
         f = repo.opener("rebasestate")
         for i, l in enumerate(f.read().splitlines()):
             if i == 0:
                 originalwd = repo[l].rev()
             elif i == 1:
                 target = repo[l].rev()
             elif i == 2:
                 external = repo[l].rev()
             elif i == 3:
                 collapse = bool(int(l))
             elif i == 4:
                 keep = bool(int(l))
             elif i == 5:
                 keepbranches = bool(int(l))
             elif i == 6 and not (len(l) == 81 and ':' in l):
                 # line 6 is a recent addition, so for backwards compatibility
                 # check that the line doesn't look like the oldrev:newrev lines
                 activebookmark = l
             else:
                 oldrev, newrev = l.split(':')
                 if newrev in (str(nullmerge), str(revignored)):
                     state[repo[oldrev].rev()] = int(newrev)
                 else:
                     state[repo[oldrev].rev()] = repo[newrev].rev()
 
         if keepbranches is None:
             raise util.Abort(_('.hg/rebasestate is incomplete'))
 
         skipped = set()
         # recompute the set of skipped revs
         if not collapse:
             seen = set([target])
             for old, new in sorted(state.items()):
                 if new != nullrev and new in seen:
                     skipped.add(old)
                 seen.add(new)
         repo.ui.debug('computed skipped revs: %s\n' %
                       (' '.join(str(r) for r in sorted(skipped)) or None))
         repo.ui.debug('rebase status resumed\n')
         return (originalwd, target, state, skipped,
                 collapse, keep, keepbranches, external, activebookmark)
     except IOError, err:
         if err.errno != errno.ENOENT:
             raise
         raise util.Abort(_('no rebase in progress'))
 
 def inrebase(repo, originalwd, state):
     '''check whether the working dir is in an interrupted rebase'''
     parents = [p.rev() for p in repo.parents()]
     if originalwd in parents:
         return True
 
     for newrev in state.itervalues():
         if newrev in parents:
             return True
 
     return False
 
 def abort(repo, originalwd, target, state):
     'Restore the repository to its original state'
     dstates = [s for s in state.values() if s > nullrev]
     immutable = [d for d in dstates if not repo[d].mutable()]
     cleanup = True
     if immutable:
         repo.ui.warn(_("warning: can't clean up immutable changesets %s\n")
                      % ', '.join(str(repo[r]) for r in immutable),
                      hint=_('see hg help phases for details'))
         cleanup = False
 
     descendants = set()
     if dstates:
         descendants = set(repo.changelog.descendants(dstates))
     if descendants - set(dstates):
         repo.ui.warn(_("warning: new changesets detected on target branch, "
                        "can't strip\n"))
         cleanup = False
 
     if cleanup:
         # Update away from the rebase if necessary
         if inrebase(repo, originalwd, state):
             merge.update(repo, repo[originalwd].rev(), False, True, False)
 
         # Strip from the first rebased revision
         rebased = filter(lambda x: x > -1 and x != target, state.values())
         if rebased:
             strippoints = [c.node()  for c in repo.set('roots(%ld)', rebased)]
             # no backup of rebased cset versions needed
             repair.strip(repo.ui, repo, strippoints)
 
     clearstatus(repo)
     repo.ui.warn(_('rebase aborted\n'))
     return 0
 
 def buildstate(repo, dest, rebaseset, collapse):
     '''Define which revisions are going to be rebased and where
 
     repo: repo
     dest: context
     rebaseset: set of rev
     '''
 
     # This check isn't strictly necessary, since mq detects commits over an
     # applied patch. But it prevents messing up the working directory when
     # a partially completed rebase is blocked by mq.
     if 'qtip' in repo.tags() and (dest.node() in
                             [s.node for s in repo.mq.applied]):
         raise util.Abort(_('cannot rebase onto an applied mq patch'))
 
     roots = list(repo.set('roots(%ld)', rebaseset))
     if not roots:
         raise util.Abort(_('no matching revisions'))
     roots.sort()
     state = {}
     detachset = set()
     for root in roots:
         commonbase = root.ancestor(dest)
         if commonbase == root:
             raise util.Abort(_('source is ancestor of destination'))
         if commonbase == dest:
             samebranch = root.branch() == dest.branch()
             if not collapse and samebranch and root in dest.children():
                 repo.ui.debug('source is a child of destination\n')
                 return None
 
         repo.ui.debug('rebase onto %d starting from %s\n' % (dest, root))
         state.update(dict.fromkeys(rebaseset, nullrev))
         # Rebase tries to turn <dest> into a parent of <root> while
         # preserving the number of parents of rebased changesets:
         #
         # - A changeset with a single parent will always be rebased as a
         #   changeset with a single parent.
         #
         # - A merge will be rebased as merge unless its parents are both
         #   ancestors of <dest> or are themselves in the rebased set and
         #   pruned while rebased.
         #
         # If one parent of <root> is an ancestor of <dest>, the rebased
         # version of this parent will be <dest>. This is always true with
         # --base option.
         #
         # Otherwise, we need to *replace* the original parents with
         # <dest>. This "detaches" the rebased set from its former location
         # and rebases it onto <dest>. Changes introduced by ancestors of
         # <root> not common with <dest> (the detachset, marked as
         # nullmerge) are "removed" from the rebased changesets.
         #
         # - If <root> has a single parent, set it to <dest>.
         #
         # - If <root> is a merge, we cannot decide which parent to
         #   replace, the rebase operation is not clearly defined.
         #
         # The table below sums up this behavior:
         #
         # +------------------+----------------------+-------------------------+
         # |                  |     one parent       |  merge                  |
         # +------------------+----------------------+-------------------------+
         # | parent in        | new parent is <dest> | parents in ::<dest> are |
         # | ::<dest>         |                      | remapped to <dest>      |
         # +------------------+----------------------+-------------------------+
         # | unrelated source | new parent is <dest> | ambiguous, abort        |
         # +------------------+----------------------+-------------------------+
         #
         # The actual abort is handled by `defineparents`
         if len(root.parents()) <= 1:
             # ancestors of <root> not ancestors of <dest>
             detachset.update(repo.changelog.findmissingrevs([commonbase.rev()],
                                                             [root.rev()]))
     for r in detachset:
         if r not in state:
             state[r] = nullmerge
     if len(roots) > 1:
         # If we have multiple roots, we may have "hole" in the rebase set.
         # Rebase roots that descend from those "hole" should not be detached as
         # other root are. We use the special `revignored` to inform rebase that
         # the revision should be ignored but that `defineparents` should search
         # a rebase destination that make sense regarding rebased topology.
         rebasedomain = set(repo.revs('%ld::%ld', rebaseset, rebaseset))
         for ignored in set(rebasedomain) - set(rebaseset):
             state[ignored] = revignored
     return repo['.'].rev(), dest.rev(), state
 
 def clearrebased(ui, repo, state, skipped, collapsedas=None):
     """dispose of rebased revision at the end of the rebase
 
     If `collapsedas` is not None, the rebase was a collapse whose result if the
     `collapsedas` node."""
     if obsolete.isenabled(repo, obsolete.createmarkersopt):
         markers = []
         for rev, newrev in sorted(state.items()):
             if newrev >= 0:
                 if rev in skipped:
                     succs = ()
                 elif collapsedas is not None:
                     succs = (repo[collapsedas],)
                 else:
                     succs = (repo[newrev],)
                 markers.append((repo[rev], succs))
         if markers:
             obsolete.createmarkers(repo, markers)
     else:
         rebased = [rev for rev in state if state[rev] > nullmerge]
         if rebased:
             stripped = []
             for root in repo.set('roots(%ld)', rebased):
                 if set(repo.changelog.descendants([root.rev()])) - set(state):
                     ui.warn(_("warning: new changesets detected "
                               "on source branch, not stripping\n"))
                 else:
                     stripped.append(root.node())
             if stripped:
                 # backup the old csets by default
                 repair.strip(ui, repo, stripped, "all")
 
 
 def pullrebase(orig, ui, repo, *args, **opts):
     'Call rebase after pull if the latter has been invoked with --rebase'
     if opts.get('rebase'):
         if opts.get('update'):
             del opts['update']
             ui.debug('--update and --rebase are not compatible, ignoring '
                      'the update flag\n')
 
         movemarkfrom = repo['.'].node()
         revsprepull = len(repo)
         origpostincoming = commands.postincoming
         def _dummy(*args, **kwargs):
             pass
         commands.postincoming = _dummy
         try:
             orig(ui, repo, *args, **opts)
         finally:
             commands.postincoming = origpostincoming
         revspostpull = len(repo)
         if revspostpull > revsprepull:
             # --rev option from pull conflict with rebase own --rev
             # dropping it
             if 'rev' in opts:
                 del opts['rev']
             rebase(ui, repo, **opts)
             branch = repo[None].branch()
             dest = repo[branch].rev()
             if dest != repo['.'].rev():
                 # there was nothing to rebase we force an update
                 hg.update(repo, dest)
                 if bookmarks.update(repo, [movemarkfrom], repo['.'].node()):
                     ui.status(_("updating bookmark %s\n")
                               % repo._bookmarkcurrent)
     else:
         if opts.get('tool'):
             raise util.Abort(_('--tool can only be used with --rebase'))
         orig(ui, repo, *args, **opts)
 
 def summaryhook(ui, repo):
     if not os.path.exists(repo.join('rebasestate')):
         return
     try:
         state = restorestatus(repo)[2]
     except error.RepoLookupError:
         # i18n: column positioning for "hg summary"
         msg = _('rebase: (use "hg rebase --abort" to clear broken state)\n')
         ui.write(msg)
         return
     numrebased = len([i for i in state.itervalues() if i != -1])
     # i18n: column positioning for "hg summary"
     ui.write(_('rebase: %s, %s (rebase --continue)\n') %
              (ui.label(_('%d rebased'), 'rebase.rebased') % numrebased,
               ui.label(_('%d remaining'), 'rebase.remaining') %
               (len(state) - numrebased)))
 
 def uisetup(ui):
     'Replace pull with a decorator to provide --rebase option'
     entry = extensions.wrapcommand(commands.table, 'pull', pullrebase)
     entry[1].append(('', 'rebase', None,
                      _("rebase working directory to branch head")))
     entry[1].append(('t', 'tool', '',
                      _("specify merge tool for rebase")))
     cmdutil.summaryhooks.add('rebase', summaryhook)
     cmdutil.unfinishedstates.append(
         ['rebasestate', False, False, _('rebase in progress'),
          _("use 'hg rebase --continue' or 'hg rebase --abort'")])

mercurial/commands.py

@@ -1,6313 +1,6314 b''
 # commands.py - command processing for mercurial
 #
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from node import hex, bin, nullid, nullrev, short
 from lock import release
 from i18n import _
 import os, re, difflib, time, tempfile, errno, shlex
 import sys, socket
 import hg, scmutil, util, revlog, copies, error, bookmarks
 import patch, help, encoding, templatekw, discovery
 import archival, changegroup, cmdutil, hbisect
 import sshserver, hgweb, commandserver
 import extensions
 from hgweb import server as hgweb_server
 import merge as mergemod
 import minirst, revset, fileset
 import dagparser, context, simplemerge, graphmod, copies
 import random
 import setdiscovery, treediscovery, dagutil, pvec, localrepo
 import phases, obsolete, exchange
 import ui as uimod
 
 table = {}
 
 command = cmdutil.command(table)
 
 # Space delimited list of commands that don't require local repositories.
 # This should be populated by passing norepo=True into the @command decorator.
 norepo = ''
 # Space delimited list of commands that optionally require local repositories.
 # This should be populated by passing optionalrepo=True into the @command
 # decorator.
 optionalrepo = ''
 # Space delimited list of commands that will examine arguments looking for
 # a repository. This should be populated by passing inferrepo=True into the
 # @command decorator.
 inferrepo = ''
 
 # common command options
 
 globalopts = [
     ('R', 'repository', '',
      _('repository root directory or name of overlay bundle file'),
      _('REPO')),
     ('', 'cwd', '',
      _('change working directory'), _('DIR')),
     ('y', 'noninteractive', None,
      _('do not prompt, automatically pick the first choice for all prompts')),
     ('q', 'quiet', None, _('suppress output')),
     ('v', 'verbose', None, _('enable additional output')),
     ('', 'config', [],
      _('set/override config option (use \'section.name=value\')'),
      _('CONFIG')),
     ('', 'debug', None, _('enable debugging output')),
     ('', 'debugger', None, _('start debugger')),
     ('', 'encoding', encoding.encoding, _('set the charset encoding'),
      _('ENCODE')),
     ('', 'encodingmode', encoding.encodingmode,
      _('set the charset encoding mode'), _('MODE')),
     ('', 'traceback', None, _('always print a traceback on exception')),
     ('', 'time', None, _('time how long the command takes')),
     ('', 'profile', None, _('print command execution profile')),
     ('', 'version', None, _('output version information and exit')),
     ('h', 'help', None, _('display help and exit')),
     ('', 'hidden', False, _('consider hidden changesets')),
 ]
 
 dryrunopts = [('n', 'dry-run', None,
                _('do not perform actions, just print output'))]
 
 remoteopts = [
     ('e', 'ssh', '',
      _('specify ssh command to use'), _('CMD')),
     ('', 'remotecmd', '',
      _('specify hg command to run on the remote side'), _('CMD')),
     ('', 'insecure', None,
      _('do not verify server certificate (ignoring web.cacerts config)')),
 ]
 
 walkopts = [
     ('I', 'include', [],
      _('include names matching the given patterns'), _('PATTERN')),
     ('X', 'exclude', [],
      _('exclude names matching the given patterns'), _('PATTERN')),
 ]
 
 commitopts = [
     ('m', 'message', '',
      _('use text as commit message'), _('TEXT')),
     ('l', 'logfile', '',
      _('read commit message from file'), _('FILE')),
 ]
 
 commitopts2 = [
     ('d', 'date', '',
      _('record the specified date as commit date'), _('DATE')),
     ('u', 'user', '',
      _('record the specified user as committer'), _('USER')),
 ]
 
 # hidden for now
 formatteropts = [
     ('T', 'template', '',
      _('display with template (DEPRECATED)'), _('TEMPLATE')),
 ]
 
 templateopts = [
     ('', 'style', '',
      _('display using template map file (DEPRECATED)'), _('STYLE')),
     ('T', 'template', '',
      _('display with template'), _('TEMPLATE')),
 ]
 
 logopts = [
     ('p', 'patch', None, _('show patch')),
     ('g', 'git', None, _('use git extended diff format')),
     ('l', 'limit', '',
      _('limit number of changes displayed'), _('NUM')),
     ('M', 'no-merges', None, _('do not show merges')),
     ('', 'stat', None, _('output diffstat-style summary of changes')),
     ('G', 'graph', None, _("show the revision DAG")),
 ] + templateopts
 
 diffopts = [
     ('a', 'text', None, _('treat all files as text')),
     ('g', 'git', None, _('use git extended diff format')),
     ('', 'nodates', None, _('omit dates from diff headers'))
 ]
 
 diffwsopts = [
     ('w', 'ignore-all-space', None,
      _('ignore white space when comparing lines')),
     ('b', 'ignore-space-change', None,
      _('ignore changes in the amount of white space')),
     ('B', 'ignore-blank-lines', None,
      _('ignore changes whose lines are all blank')),
     ]
 
 diffopts2 = [
     ('p', 'show-function', None, _('show which function each change is in')),
     ('', 'reverse', None, _('produce a diff that undoes the changes')),
     ] + diffwsopts + [
     ('U', 'unified', '',
      _('number of lines of context to show'), _('NUM')),
     ('', 'stat', None, _('output diffstat-style summary of changes')),
 ]
 
 mergetoolopts = [
     ('t', 'tool', '', _('specify merge tool')),
 ]
 
 similarityopts = [
     ('s', 'similarity', '',
      _('guess renamed files by similarity (0<=s<=100)'), _('SIMILARITY'))
 ]
 
 subrepoopts = [
     ('S', 'subrepos', None,
      _('recurse into subrepositories'))
 ]
 
 # Commands start here, listed alphabetically
 
 @command('^add',
     walkopts + subrepoopts + dryrunopts,
     _('[OPTION]... [FILE]...'),
     inferrepo=True)
 def add(ui, repo, *pats, **opts):
     """add the specified files on the next commit
 
     Schedule files to be version controlled and added to the
     repository.
 
     The files will be added to the repository at the next commit. To
     undo an add before that, see :hg:`forget`.
 
     If no names are given, add all files to the repository.
 
     .. container:: verbose
 
        An example showing how new (unknown) files are added
        automatically by :hg:`add`::
 
          $ ls
          foo.c
          $ hg status
          ? foo.c
          $ hg add
          adding foo.c
          $ hg status
          A foo.c
 
     Returns 0 if all files are successfully added.
     """
 
     m = scmutil.match(repo[None], pats, opts)
     rejected = cmdutil.add(ui, repo, m, opts.get('dry_run'),
                            opts.get('subrepos'), prefix="", explicitonly=False)
     return rejected and 1 or 0
 
 @command('addremove',
     similarityopts + walkopts + dryrunopts,
     _('[OPTION]... [FILE]...'),
     inferrepo=True)
 def addremove(ui, repo, *pats, **opts):
     """add all new files, delete all missing files
 
     Add all new files and remove all missing files from the
     repository.
 
     New files are ignored if they match any of the patterns in
     ``.hgignore``. As with add, these changes take effect at the next
     commit.
 
     Use the -s/--similarity option to detect renamed files. This
     option takes a percentage between 0 (disabled) and 100 (files must
     be identical) as its parameter. With a parameter greater than 0,
     this compares every removed file with every added file and records
     those similar enough as renames. Detecting renamed files this way
     can be expensive. After using this option, :hg:`status -C` can be
     used to check which files were identified as moved or renamed. If
     not specified, -s/--similarity defaults to 100 and only renames of
     identical files are detected.
 
     Returns 0 if all files are successfully added.
     """
     try:
         sim = float(opts.get('similarity') or 100)
     except ValueError:
         raise util.Abort(_('similarity must be a number'))
     if sim < 0 or sim > 100:
         raise util.Abort(_('similarity must be between 0 and 100'))
     return scmutil.addremove(repo, pats, opts, similarity=sim / 100.0)
 
 @command('^annotate|blame',
     [('r', 'rev', '', _('annotate the specified revision'), _('REV')),
     ('', 'follow', None,
      _('follow copies/renames and list the filename (DEPRECATED)')),
     ('', 'no-follow', None, _("don't follow copies and renames")),
     ('a', 'text', None, _('treat all files as text')),
     ('u', 'user', None, _('list the author (long with -v)')),
     ('f', 'file', None, _('list the filename')),
     ('d', 'date', None, _('list the date (short with -q)')),
     ('n', 'number', None, _('list the revision number (default)')),
     ('c', 'changeset', None, _('list the changeset')),
     ('l', 'line-number', None, _('show line number at the first appearance'))
     ] + diffwsopts + walkopts + formatteropts,
     _('[-r REV] [-f] [-a] [-u] [-d] [-n] [-c] [-l] FILE...'),
     inferrepo=True)
 def annotate(ui, repo, *pats, **opts):
     """show changeset information by line for each file
 
     List changes in files, showing the revision id responsible for
     each line
 
     This command is useful for discovering when a change was made and
     by whom.
 
     Without the -a/--text option, annotate will avoid processing files
     it detects as binary. With -a, annotate will annotate the file
     anyway, although the results will probably be neither useful
     nor desirable.
 
     Returns 0 on success.
     """
     if not pats:
         raise util.Abort(_('at least one filename or pattern is required'))
 
     if opts.get('follow'):
         # --follow is deprecated and now just an alias for -f/--file
         # to mimic the behavior of Mercurial before version 1.5
         opts['file'] = True
 
     fm = ui.formatter('annotate', opts)
     datefunc = ui.quiet and util.shortdate or util.datestr
     hexfn = fm.hexfunc
 
     opmap = [('user', ' ', lambda x: x[0].user(), ui.shortuser),
              ('number', ' ', lambda x: x[0].rev(), str),
              ('changeset', ' ', lambda x: hexfn(x[0].node()), str),
              ('date', ' ', lambda x: x[0].date(), util.cachefunc(datefunc)),
              ('file', ' ', lambda x: x[0].path(), str),
              ('line_number', ':', lambda x: x[1], str),
             ]
     fieldnamemap = {'number': 'rev', 'changeset': 'node'}
 
     if (not opts.get('user') and not opts.get('changeset')
         and not opts.get('date') and not opts.get('file')):
         opts['number'] = True
 
     linenumber = opts.get('line_number') is not None
     if linenumber and (not opts.get('changeset')) and (not opts.get('number')):
         raise util.Abort(_('at least one of -n/-c is required for -l'))
 
     if fm:
         def makefunc(get, fmt):
             return get
     else:
         def makefunc(get, fmt):
             return lambda x: fmt(get(x))
     funcmap = [(makefunc(get, fmt), sep) for op, sep, get, fmt in opmap
                if opts.get(op)]
     funcmap[0] = (funcmap[0][0], '') # no separator in front of first column
     fields = ' '.join(fieldnamemap.get(op, op) for op, sep, get, fmt in opmap
                       if opts.get(op))
 
     def bad(x, y):
         raise util.Abort("%s: %s" % (x, y))
 
     ctx = scmutil.revsingle(repo, opts.get('rev'))
     m = scmutil.match(ctx, pats, opts)
     m.bad = bad
     follow = not opts.get('no_follow')
     diffopts = patch.diffopts(ui, opts, section='annotate')
     for abs in ctx.walk(m):
         fctx = ctx[abs]
         if not opts.get('text') and util.binary(fctx.data()):
             fm.plain(_("%s: binary file\n") % ((pats and m.rel(abs)) or abs))
             continue
 
         lines = fctx.annotate(follow=follow, linenumber=linenumber,
                               diffopts=diffopts)
         formats = []
         pieces = []
 
         for f, sep in funcmap:
             l = [f(n) for n, dummy in lines]
             if l:
                 if fm:
                     formats.append(['%s' for x in l])
                 else:
                     sizes = [encoding.colwidth(x) for x in l]
                     ml = max(sizes)
                     formats.append([sep + ' ' * (ml - w) + '%s' for w in sizes])
                 pieces.append(l)
 
         for f, p, l in zip(zip(*formats), zip(*pieces), lines):
             fm.startitem()
             fm.write(fields, "".join(f), *p)
             fm.write('line', ": %s", l[1])
 
         if lines and not lines[-1][1].endswith('\n'):
             fm.plain('\n')
 
     fm.end()
 
 @command('archive',
     [('', 'no-decode', None, _('do not pass files through decoders')),
     ('p', 'prefix', '', _('directory prefix for files in archive'),
      _('PREFIX')),
     ('r', 'rev', '', _('revision to distribute'), _('REV')),
     ('t', 'type', '', _('type of distribution to create'), _('TYPE')),
     ] + subrepoopts + walkopts,
     _('[OPTION]... DEST'))
 def archive(ui, repo, dest, **opts):
     '''create an unversioned archive of a repository revision
 
     By default, the revision used is the parent of the working
     directory; use -r/--rev to specify a different revision.
 
     The archive type is automatically detected based on file
     extension (or override using -t/--type).
 
     .. container:: verbose
 
       Examples:
 
       - create a zip file containing the 1.0 release::
 
           hg archive -r 1.0 project-1.0.zip
 
       - create a tarball excluding .hg files::
 
           hg archive project.tar.gz -X ".hg*"
 
     Valid types are:
 
     :``files``: a directory full of files (default)
     :``tar``:   tar archive, uncompressed
     :``tbz2``:  tar archive, compressed using bzip2
     :``tgz``:   tar archive, compressed using gzip
     :``uzip``:  zip archive, uncompressed
     :``zip``:   zip archive, compressed using deflate
 
     The exact name of the destination archive or directory is given
     using a format string; see :hg:`help export` for details.
 
     Each member added to an archive file has a directory prefix
     prepended. Use -p/--prefix to specify a format string for the
     prefix. The default is the basename of the archive, with suffixes
     removed.
 
     Returns 0 on success.
     '''
 
     ctx = scmutil.revsingle(repo, opts.get('rev'))
     if not ctx:
         raise util.Abort(_('no working directory: please specify a revision'))
     node = ctx.node()
     dest = cmdutil.makefilename(repo, dest, node)
     if os.path.realpath(dest) == repo.root:
         raise util.Abort(_('repository root cannot be destination'))
 
     kind = opts.get('type') or archival.guesskind(dest) or 'files'
     prefix = opts.get('prefix')
 
     if dest == '-':
         if kind == 'files':
             raise util.Abort(_('cannot archive plain files to stdout'))
         dest = cmdutil.makefileobj(repo, dest)
         if not prefix:
             prefix = os.path.basename(repo.root) + '-%h'
 
     prefix = cmdutil.makefilename(repo, prefix, node)
     matchfn = scmutil.match(ctx, [], opts)
     archival.archive(repo, dest, node, kind, not opts.get('no_decode'),
                      matchfn, prefix, subrepos=opts.get('subrepos'))
 
 @command('backout',
     [('', 'merge', None, _('merge with old dirstate parent after backout')),
     ('', 'parent', '',
      _('parent to choose when backing out merge (DEPRECATED)'), _('REV')),
     ('r', 'rev', '', _('revision to backout'), _('REV')),
     ('e', 'edit', False, _('invoke editor on commit messages')),
     ] + mergetoolopts + walkopts + commitopts + commitopts2,
     _('[OPTION]... [-r] REV'))
 def backout(ui, repo, node=None, rev=None, **opts):
     '''reverse effect of earlier changeset
 
     Prepare a new changeset with the effect of REV undone in the
     current working directory.
 
     If REV is the parent of the working directory, then this new changeset
     is committed automatically. Otherwise, hg needs to merge the
     changes and the merged result is left uncommitted.
 
     .. note::
 
       backout cannot be used to fix either an unwanted or
       incorrect merge.
 
     .. container:: verbose
 
       By default, the pending changeset will have one parent,
       maintaining a linear history. With --merge, the pending
       changeset will instead have two parents: the old parent of the
       working directory and a new child of REV that simply undoes REV.
 
       Before version 1.7, the behavior without --merge was equivalent
       to specifying --merge followed by :hg:`update --clean .` to
       cancel the merge and leave the child of REV as a head to be
       merged separately.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     Returns 0 on success, 1 if nothing to backout or there are unresolved
     files.
     '''
     if rev and node:
         raise util.Abort(_("please specify just one revision"))
 
     if not rev:
         rev = node
 
     if not rev:
         raise util.Abort(_("please specify a revision to backout"))
 
     date = opts.get('date')
     if date:
         opts['date'] = util.parsedate(date)
 
     cmdutil.checkunfinished(repo)
     cmdutil.bailifchanged(repo)
     node = scmutil.revsingle(repo, rev).node()
 
     op1, op2 = repo.dirstate.parents()
     if not repo.changelog.isancestor(node, op1):
         raise util.Abort(_('cannot backout change that is not an ancestor'))
 
     p1, p2 = repo.changelog.parents(node)
     if p1 == nullid:
         raise util.Abort(_('cannot backout a change with no parents'))
     if p2 != nullid:
         if not opts.get('parent'):
             raise util.Abort(_('cannot backout a merge changeset'))
         p = repo.lookup(opts['parent'])
         if p not in (p1, p2):
             raise util.Abort(_('%s is not a parent of %s') %
                              (short(p), short(node)))
         parent = p
     else:
         if opts.get('parent'):
             raise util.Abort(_('cannot use --parent on non-merge changeset'))
         parent = p1
 
     # the backout should appear on the same branch
     wlock = repo.wlock()
     try:
         branch = repo.dirstate.branch()
         bheads = repo.branchheads(branch)
         rctx = scmutil.revsingle(repo, hex(parent))
         if not opts.get('merge') and op1 != node:
             try:
                 ui.setconfig('ui', 'forcemerge', opts.get('tool', ''),
                              'backout')
                 repo.dirstate.beginparentchange()
                 stats = mergemod.update(repo, parent, True, True, False,
                                         node, False)
                 repo.setparents(op1, op2)
                 repo.dirstate.endparentchange()
                 hg._showstats(repo, stats)
                 if stats[3]:
                     repo.ui.status(_("use 'hg resolve' to retry unresolved "
                                      "file merges\n"))
                 else:
                     msg = _("changeset %s backed out, "
                             "don't forget to commit.\n")
                     ui.status(msg % short(node))
                 return stats[3] > 0
             finally:
                 ui.setconfig('ui', 'forcemerge', '', '')
         else:
             hg.clean(repo, node, show_stats=False)
             repo.dirstate.setbranch(branch)
             cmdutil.revert(ui, repo, rctx, repo.dirstate.parents())
 
 
         def commitfunc(ui, repo, message, match, opts):
             editform = 'backout'
             e = cmdutil.getcommiteditor(editform=editform, **opts)
             if not message:
                 # we don't translate commit messages
                 message = "Backed out changeset %s" % short(node)
                 e = cmdutil.getcommiteditor(edit=True, editform=editform)
             return repo.commit(message, opts.get('user'), opts.get('date'),
                                match, editor=e)
         newnode = cmdutil.commit(ui, repo, commitfunc, [], opts)
         if not newnode:
             ui.status(_("nothing changed\n"))
             return 1
         cmdutil.commitstatus(repo, newnode, branch, bheads)
 
         def nice(node):
             return '%d:%s' % (repo.changelog.rev(node), short(node))
         ui.status(_('changeset %s backs out changeset %s\n') %
                   (nice(repo.changelog.tip()), nice(node)))
         if opts.get('merge') and op1 != node:
             hg.clean(repo, op1, show_stats=False)
             ui.status(_('merging with changeset %s\n')
                       % nice(repo.changelog.tip()))
             try:
                 ui.setconfig('ui', 'forcemerge', opts.get('tool', ''),
                              'backout')
                 return hg.merge(repo, hex(repo.changelog.tip()))
             finally:
                 ui.setconfig('ui', 'forcemerge', '', '')
     finally:
         wlock.release()
     return 0
 
 @command('bisect',
     [('r', 'reset', False, _('reset bisect state')),
     ('g', 'good', False, _('mark changeset good')),
     ('b', 'bad', False, _('mark changeset bad')),
     ('s', 'skip', False, _('skip testing changeset')),
     ('e', 'extend', False, _('extend the bisect range')),
     ('c', 'command', '', _('use command to check changeset state'), _('CMD')),
     ('U', 'noupdate', False, _('do not update to target'))],
     _("[-gbsr] [-U] [-c CMD] [REV]"))
 def bisect(ui, repo, rev=None, extra=None, command=None,
                reset=None, good=None, bad=None, skip=None, extend=None,
                noupdate=None):
     """subdivision search of changesets
 
     This command helps to find changesets which introduce problems. To
     use, mark the earliest changeset you know exhibits the problem as
     bad, then mark the latest changeset which is free from the problem
     as good. Bisect will update your working directory to a revision
     for testing (unless the -U/--noupdate option is specified). Once
     you have performed tests, mark the working directory as good or
     bad, and bisect will either update to another candidate changeset
     or announce that it has found the bad revision.
 
     As a shortcut, you can also use the revision argument to mark a
     revision as good or bad without checking it out first.
 
     If you supply a command, it will be used for automatic bisection.
     The environment variable HG_NODE will contain the ID of the
     changeset being tested. The exit status of the command will be
     used to mark revisions as good or bad: status 0 means good, 125
     means to skip the revision, 127 (command not found) will abort the
     bisection, and any other non-zero exit status means the revision
     is bad.
 
     .. container:: verbose
 
       Some examples:
 
       - start a bisection with known bad revision 34, and good revision 12::
 
           hg bisect --bad 34
           hg bisect --good 12
 
       - advance the current bisection by marking current revision as good or
         bad::
 
           hg bisect --good
           hg bisect --bad
 
       - mark the current revision, or a known revision, to be skipped (e.g. if
         that revision is not usable because of another issue)::
 
           hg bisect --skip
           hg bisect --skip 23
 
       - skip all revisions that do not touch directories ``foo`` or ``bar``::
 
           hg bisect --skip "!( file('path:foo') & file('path:bar') )"
 
       - forget the current bisection::
 
           hg bisect --reset
 
       - use 'make && make tests' to automatically find the first broken
         revision::
 
           hg bisect --reset
           hg bisect --bad 34
           hg bisect --good 12
           hg bisect --command "make && make tests"
 
       - see all changesets whose states are already known in the current
         bisection::
 
           hg log -r "bisect(pruned)"
 
       - see the changeset currently being bisected (especially useful
         if running with -U/--noupdate)::
 
           hg log -r "bisect(current)"
 
       - see all changesets that took part in the current bisection::
 
           hg log -r "bisect(range)"
 
       - you can even get a nice graph::
 
           hg log --graph -r "bisect(range)"
 
       See :hg:`help revsets` for more about the `bisect()` keyword.
 
     Returns 0 on success.
     """
     def extendbisectrange(nodes, good):
         # bisect is incomplete when it ends on a merge node and
         # one of the parent was not checked.
         parents = repo[nodes[0]].parents()
         if len(parents) > 1:
             side = good and state['bad'] or state['good']
             num = len(set(i.node() for i in parents) & set(side))
             if num == 1:
                 return parents[0].ancestor(parents[1])
         return None
 
     def print_result(nodes, good):
         displayer = cmdutil.show_changeset(ui, repo, {})
         if len(nodes) == 1:
             # narrowed it down to a single revision
             if good:
                 ui.write(_("The first good revision is:\n"))
             else:
                 ui.write(_("The first bad revision is:\n"))
             displayer.show(repo[nodes[0]])
             extendnode = extendbisectrange(nodes, good)
             if extendnode is not None:
                 ui.write(_('Not all ancestors of this changeset have been'
                            ' checked.\nUse bisect --extend to continue the '
                            'bisection from\nthe common ancestor, %s.\n')
                          % extendnode)
         else:
             # multiple possible revisions
             if good:
                 ui.write(_("Due to skipped revisions, the first "
                         "good revision could be any of:\n"))
             else:
                 ui.write(_("Due to skipped revisions, the first "
                         "bad revision could be any of:\n"))
             for n in nodes:
                 displayer.show(repo[n])
         displayer.close()
 
     def check_state(state, interactive=True):
         if not state['good'] or not state['bad']:
             if (good or bad or skip or reset) and interactive:
                 return
             if not state['good']:
                 raise util.Abort(_('cannot bisect (no known good revisions)'))
             else:
                 raise util.Abort(_('cannot bisect (no known bad revisions)'))
         return True
 
     # backward compatibility
     if rev in "good bad reset init".split():
         ui.warn(_("(use of 'hg bisect <cmd>' is deprecated)\n"))
         cmd, rev, extra = rev, extra, None
         if cmd == "good":
             good = True
         elif cmd == "bad":
             bad = True
         else:
             reset = True
     elif extra or good + bad + skip + reset + extend + bool(command) > 1:
         raise util.Abort(_('incompatible arguments'))
 
     cmdutil.checkunfinished(repo)
 
     if reset:
         p = repo.join("bisect.state")
         if os.path.exists(p):
             os.unlink(p)
         return
 
     state = hbisect.load_state(repo)
 
     if command:
         changesets = 1
         if noupdate:
             try:
                 node = state['current'][0]
             except LookupError:
                 raise util.Abort(_('current bisect revision is unknown - '
                                    'start a new bisect to fix'))
         else:
             node, p2 = repo.dirstate.parents()
             if p2 != nullid:
                 raise util.Abort(_('current bisect revision is a merge'))
         try:
             while changesets:
                 # update state
                 state['current'] = [node]
                 hbisect.save_state(repo, state)
                 status = util.system(command,
                                      environ={'HG_NODE': hex(node)},
                                      out=ui.fout)
                 if status == 125:
                     transition = "skip"
                 elif status == 0:
                     transition = "good"
                 # status < 0 means process was killed
                 elif status == 127:
                     raise util.Abort(_("failed to execute %s") % command)
                 elif status < 0:
                     raise util.Abort(_("%s killed") % command)
                 else:
                     transition = "bad"
                 ctx = scmutil.revsingle(repo, rev, node)
                 rev = None # clear for future iterations
                 state[transition].append(ctx.node())
                 ui.status(_('changeset %d:%s: %s\n') % (ctx, ctx, transition))
                 check_state(state, interactive=False)
                 # bisect
                 nodes, changesets, bgood = hbisect.bisect(repo.changelog, state)
                 # update to next check
                 node = nodes[0]
                 if not noupdate:
                     cmdutil.bailifchanged(repo)
                     hg.clean(repo, node, show_stats=False)
         finally:
             state['current'] = [node]
             hbisect.save_state(repo, state)
         print_result(nodes, bgood)
         return
 
     # update state
 
     if rev:
         nodes = [repo.lookup(i) for i in scmutil.revrange(repo, [rev])]
     else:
         nodes = [repo.lookup('.')]
 
     if good or bad or skip:
         if good:
             state['good'] += nodes
         elif bad:
             state['bad'] += nodes
         elif skip:
             state['skip'] += nodes
         hbisect.save_state(repo, state)
 
     if not check_state(state):
         return
 
     # actually bisect
     nodes, changesets, good = hbisect.bisect(repo.changelog, state)
     if extend:
         if not changesets:
             extendnode = extendbisectrange(nodes, good)
             if extendnode is not None:
                 ui.write(_("Extending search to changeset %d:%s\n")
                          % (extendnode.rev(), extendnode))
                 state['current'] = [extendnode.node()]
                 hbisect.save_state(repo, state)
                 if noupdate:
                     return
                 cmdutil.bailifchanged(repo)
                 return hg.clean(repo, extendnode.node())
         raise util.Abort(_("nothing to extend"))
 
     if changesets == 0:
         print_result(nodes, good)
     else:
         assert len(nodes) == 1 # only a single node can be tested next
         node = nodes[0]
         # compute the approximate number of remaining tests
         tests, size = 0, 2
         while size <= changesets:
             tests, size = tests + 1, size * 2
         rev = repo.changelog.rev(node)
         ui.write(_("Testing changeset %d:%s "
                    "(%d changesets remaining, ~%d tests)\n")
                  % (rev, short(node), changesets, tests))
         state['current'] = [node]
         hbisect.save_state(repo, state)
         if not noupdate:
             cmdutil.bailifchanged(repo)
             return hg.clean(repo, node)
 
 @command('bookmarks|bookmark',
     [('f', 'force', False, _('force')),
     ('r', 'rev', '', _('revision'), _('REV')),
     ('d', 'delete', False, _('delete a given bookmark')),
     ('m', 'rename', '', _('rename a given bookmark'), _('NAME')),
     ('i', 'inactive', False, _('mark a bookmark inactive')),
     ] + formatteropts,
     _('hg bookmarks [OPTIONS]... [NAME]...'))
 def bookmark(ui, repo, *names, **opts):
     '''create a new bookmark or list existing bookmarks
 
     Bookmarks are labels on changesets to help track lines of development.
     Bookmarks are unversioned and can be moved, renamed and deleted.
     Deleting or moving a bookmark has no effect on the associated changesets.
 
     Creating or updating to a bookmark causes it to be marked as 'active'.
     The active bookmark is indicated with a '*'.
     When a commit is made, the active bookmark will advance to the new commit.
     A plain :hg:`update` will also advance an active bookmark, if possible.
     Updating away from a bookmark will cause it to be deactivated.
 
     Bookmarks can be pushed and pulled between repositories (see
     :hg:`help push` and :hg:`help pull`). If a shared bookmark has
     diverged, a new 'divergent bookmark' of the form 'name@path' will
     be created. Using :hg:'merge' will resolve the divergence.
 
     A bookmark named '@' has the special property that :hg:`clone` will
     check it out by default if it exists.
 
     .. container:: verbose
 
       Examples:
 
       - create an active bookmark for a new line of development::
 
           hg book new-feature
 
       - create an inactive bookmark as a place marker::
 
           hg book -i reviewed
 
       - create an inactive bookmark on another changeset::
 
           hg book -r .^ tested
 
       - move the '@' bookmark from another branch::
 
           hg book -f @
     '''
     force = opts.get('force')
     rev = opts.get('rev')
     delete = opts.get('delete')
     rename = opts.get('rename')
     inactive = opts.get('inactive')
 
     def checkformat(mark):
         mark = mark.strip()
         if not mark:
             raise util.Abort(_("bookmark names cannot consist entirely of "
                                "whitespace"))
         scmutil.checknewlabel(repo, mark, 'bookmark')
         return mark
 
     def checkconflict(repo, mark, cur, force=False, target=None):
         if mark in marks and not force:
             if target:
                 if marks[mark] == target and target == cur:
                     # re-activating a bookmark
                     return
                 anc = repo.changelog.ancestors([repo[target].rev()])
                 bmctx = repo[marks[mark]]
                 divs = [repo[b].node() for b in marks
                         if b.split('@', 1)[0] == mark.split('@', 1)[0]]
 
                 # allow resolving a single divergent bookmark even if moving
                 # the bookmark across branches when a revision is specified
                 # that contains a divergent bookmark
                 if bmctx.rev() not in anc and target in divs:
                     bookmarks.deletedivergent(repo, [target], mark)
                     return
 
                 deletefrom = [b for b in divs
                               if repo[b].rev() in anc or b == target]
                 bookmarks.deletedivergent(repo, deletefrom, mark)
                 if bookmarks.validdest(repo, bmctx, repo[target]):
                     ui.status(_("moving bookmark '%s' forward from %s\n") %
                               (mark, short(bmctx.node())))
                     return
             raise util.Abort(_("bookmark '%s' already exists "
                                "(use -f to force)") % mark)
         if ((mark in repo.branchmap() or mark == repo.dirstate.branch())
             and not force):
             raise util.Abort(
                 _("a bookmark cannot have the name of an existing branch"))
 
     if delete and rename:
         raise util.Abort(_("--delete and --rename are incompatible"))
     if delete and rev:
         raise util.Abort(_("--rev is incompatible with --delete"))
     if rename and rev:
         raise util.Abort(_("--rev is incompatible with --rename"))
     if not names and (delete or rev):
         raise util.Abort(_("bookmark name required"))
 
     if delete or rename or names or inactive:
         wlock = repo.wlock()
         try:
             cur = repo.changectx('.').node()
             marks = repo._bookmarks
             if delete:
                 for mark in names:
                     if mark not in marks:
                         raise util.Abort(_("bookmark '%s' does not exist") %
                                          mark)
                     if mark == repo._bookmarkcurrent:
                         bookmarks.unsetcurrent(repo)
                     del marks[mark]
                 marks.write()
 
             elif rename:
                 if not names:
                     raise util.Abort(_("new bookmark name required"))
                 elif len(names) > 1:
                     raise util.Abort(_("only one new bookmark name allowed"))
                 mark = checkformat(names[0])
                 if rename not in marks:
                     raise util.Abort(_("bookmark '%s' does not exist") % rename)
                 checkconflict(repo, mark, cur, force)
                 marks[mark] = marks[rename]
                 if repo._bookmarkcurrent == rename and not inactive:
                     bookmarks.setcurrent(repo, mark)
                 del marks[rename]
                 marks.write()
 
             elif names:
                 newact = None
                 for mark in names:
                     mark = checkformat(mark)
                     if newact is None:
                         newact = mark
                     if inactive and mark == repo._bookmarkcurrent:
                         bookmarks.unsetcurrent(repo)
                         return
                     tgt = cur
                     if rev:
                         tgt = scmutil.revsingle(repo, rev).node()
                     checkconflict(repo, mark, cur, force, tgt)
                     marks[mark] = tgt
                 if not inactive and cur == marks[newact] and not rev:
                     bookmarks.setcurrent(repo, newact)
                 elif cur != tgt and newact == repo._bookmarkcurrent:
                     bookmarks.unsetcurrent(repo)
                 marks.write()
 
             elif inactive:
                 if len(marks) == 0:
                     ui.status(_("no bookmarks set\n"))
                 elif not repo._bookmarkcurrent:
                     ui.status(_("no active bookmark\n"))
                 else:
                     bookmarks.unsetcurrent(repo)
         finally:
             wlock.release()
     else: # show bookmarks
         fm = ui.formatter('bookmarks', opts)
         hexfn = fm.hexfunc
         marks = repo._bookmarks
         if len(marks) == 0 and not fm:
             ui.status(_("no bookmarks set\n"))
         for bmark, n in sorted(marks.iteritems()):
             current = repo._bookmarkcurrent
             if bmark == current:
                 prefix, label = '*', 'bookmarks.current'
             else:
                 prefix, label = ' ', ''
 
             fm.startitem()
             if not ui.quiet:
                 fm.plain(' %s ' % prefix, label=label)
             fm.write('bookmark', '%s', bmark, label=label)
             pad = " " * (25 - encoding.colwidth(bmark))
             fm.condwrite(not ui.quiet, 'rev node', pad + ' %d:%s',
                          repo.changelog.rev(n), hexfn(n), label=label)
             fm.data(active=(bmark == current))
             fm.plain('\n')
         fm.end()
 
 @command('branch',
     [('f', 'force', None,
      _('set branch name even if it shadows an existing branch')),
     ('C', 'clean', None, _('reset branch name to parent branch name'))],
     _('[-fC] [NAME]'))
 def branch(ui, repo, label=None, **opts):
     """set or show the current branch name
 
     .. note::
 
        Branch names are permanent and global. Use :hg:`bookmark` to create a
        light-weight bookmark instead. See :hg:`help glossary` for more
        information about named branches and bookmarks.
 
     With no argument, show the current branch name. With one argument,
     set the working directory branch name (the branch will not exist
     in the repository until the next commit). Standard practice
     recommends that primary development take place on the 'default'
     branch.
 
     Unless -f/--force is specified, branch will not let you set a
     branch name that already exists, even if it's inactive.
 
     Use -C/--clean to reset the working directory branch to that of
     the parent of the working directory, negating a previous branch
     change.
 
     Use the command :hg:`update` to switch to an existing branch. Use
     :hg:`commit --close-branch` to mark this branch as closed.
 
     Returns 0 on success.
     """
     if label:
         label = label.strip()
 
     if not opts.get('clean') and not label:
         ui.write("%s\n" % repo.dirstate.branch())
         return
 
     wlock = repo.wlock()
     try:
         if opts.get('clean'):
             label = repo[None].p1().branch()
             repo.dirstate.setbranch(label)
             ui.status(_('reset working directory to branch %s\n') % label)
         elif label:
             if not opts.get('force') and label in repo.branchmap():
                 if label not in [p.branch() for p in repo.parents()]:
                     raise util.Abort(_('a branch of the same name already'
                                        ' exists'),
                                      # i18n: "it" refers to an existing branch
                                      hint=_("use 'hg update' to switch to it"))
             scmutil.checknewlabel(repo, label, 'branch')
             repo.dirstate.setbranch(label)
             ui.status(_('marked working directory as branch %s\n') % label)
             ui.status(_('(branches are permanent and global, '
                         'did you want a bookmark?)\n'))
     finally:
         wlock.release()
 
 @command('branches',
     [('a', 'active', False, _('show only branches that have unmerged heads')),
      ('c', 'closed', False, _('show normal and closed branches')),
     ] + formatteropts,
     _('[-ac]'))
 def branches(ui, repo, active=False, closed=False, **opts):
     """list repository named branches
 
     List the repository's named branches, indicating which ones are
     inactive. If -c/--closed is specified, also list branches which have
     been marked closed (see :hg:`commit --close-branch`).
 
     If -a/--active is specified, only show active branches. A branch
     is considered active if it contains repository heads.
 
     Use the command :hg:`update` to switch to an existing branch.
 
     Returns 0.
     """
 
     fm = ui.formatter('branches', opts)
     hexfunc = fm.hexfunc
 
     allheads = set(repo.heads())
     branches = []
     for tag, heads, tip, isclosed in repo.branchmap().iterbranches():
         isactive = not isclosed and bool(set(heads) & allheads)
         branches.append((tag, repo[tip], isactive, not isclosed))
     branches.sort(key=lambda i: (i[2], i[1].rev(), i[0], i[3]),
                   reverse=True)
 
     for tag, ctx, isactive, isopen in branches:
         if active and not isactive:
             continue
         if isactive:
             label = 'branches.active'
             notice = ''
         elif not isopen:
             if not closed:
                 continue
             label = 'branches.closed'
             notice = _(' (closed)')
         else:
             label = 'branches.inactive'
             notice = _(' (inactive)')
         current = (tag == repo.dirstate.branch())
         if current:
             label = 'branches.current'
 
         fm.startitem()
         fm.write('branch', '%s', tag, label=label)
         rev = ctx.rev()
         padsize = max(31 - len(str(rev)) - encoding.colwidth(tag), 0)
         fmt = ' ' * padsize + ' %d:%s'
         fm.condwrite(not ui.quiet, 'rev node', fmt, rev, hexfunc(ctx.node()),
                      label='log.changeset changeset.%s' % ctx.phasestr())
         fm.data(active=isactive, closed=not isopen, current=current)
         if not ui.quiet:
             fm.plain(notice)
         fm.plain('\n')
     fm.end()
 
 @command('bundle',
     [('f', 'force', None, _('run even when the destination is unrelated')),
     ('r', 'rev', [], _('a changeset intended to be added to the destination'),
      _('REV')),
     ('b', 'branch', [], _('a specific branch you would like to bundle'),
      _('BRANCH')),
     ('', 'base', [],
      _('a base changeset assumed to be available at the destination'),
      _('REV')),
     ('a', 'all', None, _('bundle all changesets in the repository')),
     ('t', 'type', 'bzip2', _('bundle compression type to use'), _('TYPE')),
     ] + remoteopts,
     _('[-f] [-t TYPE] [-a] [-r REV]... [--base REV]... FILE [DEST]'))
 def bundle(ui, repo, fname, dest=None, **opts):
     """create a changegroup file
 
     Generate a compressed changegroup file collecting changesets not
     known to be in another repository.
 
     If you omit the destination repository, then hg assumes the
     destination will have all the nodes you specify with --base
     parameters. To create a bundle containing all changesets, use
     -a/--all (or --base null).
 
     You can change compression method with the -t/--type option.
     The available compression methods are: none, bzip2, and
     gzip (by default, bundles are compressed using bzip2).
 
     The bundle file can then be transferred using conventional means
     and applied to another repository with the unbundle or pull
     command. This is useful when direct push and pull are not
     available or when exporting an entire repository is undesirable.
 
     Applying bundles preserves all changeset contents including
     permissions, copy/rename information, and revision history.
 
     Returns 0 on success, 1 if no changes found.
     """
     revs = None
     if 'rev' in opts:
         revs = scmutil.revrange(repo, opts['rev'])
 
     bundletype = opts.get('type', 'bzip2').lower()
     btypes = {'none': 'HG10UN', 'bzip2': 'HG10BZ', 'gzip': 'HG10GZ'}
     bundletype = btypes.get(bundletype)
     if bundletype not in changegroup.bundletypes:
         raise util.Abort(_('unknown bundle type specified with --type'))
 
     if opts.get('all'):
         base = ['null']
     else:
         base = scmutil.revrange(repo, opts.get('base'))
     # TODO: get desired bundlecaps from command line.
     bundlecaps = None
     if base:
         if dest:
             raise util.Abort(_("--base is incompatible with specifying "
                                "a destination"))
         common = [repo.lookup(rev) for rev in base]
         heads = revs and map(repo.lookup, revs) or revs
         cg = changegroup.getchangegroup(repo, 'bundle', heads=heads,
                                          common=common, bundlecaps=bundlecaps)
         outgoing = None
     else:
         dest = ui.expandpath(dest or 'default-push', dest or 'default')
         dest, branches = hg.parseurl(dest, opts.get('branch'))
         other = hg.peer(repo, opts, dest)
         revs, checkout = hg.addbranchrevs(repo, repo, branches, revs)
         heads = revs and map(repo.lookup, revs) or revs
         outgoing = discovery.findcommonoutgoing(repo, other,
                                                 onlyheads=heads,
                                                 force=opts.get('force'),
                                                 portable=True)
         cg = changegroup.getlocalchangegroup(repo, 'bundle', outgoing,
                                              bundlecaps)
     if not cg:
         scmutil.nochangesfound(ui, repo, outgoing and outgoing.excluded)
         return 1
 
     changegroup.writebundle(cg, fname, bundletype)
 
 @command('cat',
     [('o', 'output', '',
      _('print output to file with formatted name'), _('FORMAT')),
     ('r', 'rev', '', _('print the given revision'), _('REV')),
     ('', 'decode', None, _('apply any matching decode filter')),
     ] + walkopts,
     _('[OPTION]... FILE...'),
     inferrepo=True)
 def cat(ui, repo, file1, *pats, **opts):
     """output the current or given revision of files
 
     Print the specified files as they were at the given revision. If
     no revision is given, the parent of the working directory is used.
 
     Output may be to a file, in which case the name of the file is
     given using a format string. The formatting rules as follows:
 
     :``%%``: literal "%" character
     :``%s``: basename of file being printed
     :``%d``: dirname of file being printed, or '.' if in repository root
     :``%p``: root-relative path name of file being printed
     :``%H``: changeset hash (40 hexadecimal digits)
     :``%R``: changeset revision number
     :``%h``: short-form changeset hash (12 hexadecimal digits)
     :``%r``: zero-padded changeset revision number
     :``%b``: basename of the exporting repository
 
     Returns 0 on success.
     """
     ctx = scmutil.revsingle(repo, opts.get('rev'))
     m = scmutil.match(ctx, (file1,) + pats, opts)
 
     return cmdutil.cat(ui, repo, ctx, m, '', **opts)
 
 @command('^clone',
     [('U', 'noupdate', None,
      _('the clone will include an empty working copy (only a repository)')),
     ('u', 'updaterev', '', _('revision, tag or branch to check out'), _('REV')),
     ('r', 'rev', [], _('include the specified changeset'), _('REV')),
     ('b', 'branch', [], _('clone only the specified branch'), _('BRANCH')),
     ('', 'pull', None, _('use pull protocol to copy metadata')),
     ('', 'uncompressed', None, _('use uncompressed transfer (fast over LAN)')),
     ] + remoteopts,
     _('[OPTION]... SOURCE [DEST]'),
     norepo=True)
 def clone(ui, source, dest=None, **opts):
     """make a copy of an existing repository
 
     Create a copy of an existing repository in a new directory.
 
     If no destination directory name is specified, it defaults to the
     basename of the source.
 
     The location of the source is added to the new repository's
     ``.hg/hgrc`` file, as the default to be used for future pulls.
 
     Only local paths and ``ssh://`` URLs are supported as
     destinations. For ``ssh://`` destinations, no working directory or
     ``.hg/hgrc`` will be created on the remote side.
 
     To pull only a subset of changesets, specify one or more revisions
     identifiers with -r/--rev or branches with -b/--branch. The
     resulting clone will contain only the specified changesets and
     their ancestors. These options (or 'clone src#rev dest') imply
     --pull, even for local source repositories. Note that specifying a
     tag will include the tagged changeset but not the changeset
     containing the tag.
 
     If the source repository has a bookmark called '@' set, that
     revision will be checked out in the new repository by default.
 
     To check out a particular version, use -u/--update, or
     -U/--noupdate to create a clone with no working directory.
 
     .. container:: verbose
 
       For efficiency, hardlinks are used for cloning whenever the
       source and destination are on the same filesystem (note this
       applies only to the repository data, not to the working
       directory). Some filesystems, such as AFS, implement hardlinking
       incorrectly, but do not report errors. In these cases, use the
       --pull option to avoid hardlinking.
 
       In some cases, you can clone repositories and the working
       directory using full hardlinks with ::
 
         $ cp -al REPO REPOCLONE
 
       This is the fastest way to clone, but it is not always safe. The
       operation is not atomic (making sure REPO is not modified during
       the operation is up to you) and you have to make sure your
       editor breaks hardlinks (Emacs and most Linux Kernel tools do
       so). Also, this is not compatible with certain extensions that
       place their metadata under the .hg directory, such as mq.
 
       Mercurial will update the working directory to the first applicable
       revision from this list:
 
       a) null if -U or the source repository has no changesets
       b) if -u . and the source repository is local, the first parent of
          the source repository's working directory
       c) the changeset specified with -u (if a branch name, this means the
          latest head of that branch)
       d) the changeset specified with -r
       e) the tipmost head specified with -b
       f) the tipmost head specified with the url#branch source syntax
       g) the revision marked with the '@' bookmark, if present
       h) the tipmost head of the default branch
       i) tip
 
       Examples:
 
       - clone a remote repository to a new directory named hg/::
 
           hg clone http://selenic.com/hg
 
       - create a lightweight local clone::
 
           hg clone project/ project-feature/
 
       - clone from an absolute path on an ssh server (note double-slash)::
 
           hg clone ssh://user@server//home/projects/alpha/
 
       - do a high-speed clone over a LAN while checking out a
         specified version::
 
           hg clone --uncompressed http://server/repo -u 1.5
 
       - create a repository without changesets after a particular revision::
 
           hg clone -r 04e544 experimental/ good/
 
       - clone (and track) a particular named branch::
 
           hg clone http://selenic.com/hg#stable
 
     See :hg:`help urls` for details on specifying URLs.
 
     Returns 0 on success.
     """
     if opts.get('noupdate') and opts.get('updaterev'):
         raise util.Abort(_("cannot specify both --noupdate and --updaterev"))
 
     r = hg.clone(ui, opts, source, dest,
                  pull=opts.get('pull'),
                  stream=opts.get('uncompressed'),
                  rev=opts.get('rev'),
                  update=opts.get('updaterev') or not opts.get('noupdate'),
                  branch=opts.get('branch'))
 
     return r is None
 
 @command('^commit|ci',
     [('A', 'addremove', None,
      _('mark new/missing files as added/removed before committing')),
     ('', 'close-branch', None,
      _('mark a branch as closed, hiding it from the branch list')),
     ('', 'amend', None, _('amend the parent of the working dir')),
     ('s', 'secret', None, _('use the secret phase for committing')),
     ('e', 'edit', None, _('invoke editor on commit messages')),
     ] + walkopts + commitopts + commitopts2 + subrepoopts,
     _('[OPTION]... [FILE]...'),
     inferrepo=True)
 def commit(ui, repo, *pats, **opts):
     """commit the specified files or all outstanding changes
 
     Commit changes to the given files into the repository. Unlike a
     centralized SCM, this operation is a local operation. See
     :hg:`push` for a way to actively distribute your changes.
 
     If a list of files is omitted, all changes reported by :hg:`status`
     will be committed.
 
     If you are committing the result of a merge, do not provide any
     filenames or -I/-X filters.
 
     If no commit message is specified, Mercurial starts your
     configured editor where you can enter a message. In case your
     commit fails, you will find a backup of your message in
     ``.hg/last-message.txt``.
 
     The --amend flag can be used to amend the parent of the
     working directory with a new commit that contains the changes
     in the parent in addition to those currently reported by :hg:`status`,
     if there are any. The old commit is stored in a backup bundle in
     ``.hg/strip-backup`` (see :hg:`help bundle` and :hg:`help unbundle`
     on how to restore it).
 
     Message, user and date are taken from the amended commit unless
     specified. When a message isn't specified on the command line,
     the editor will open with the message of the amended commit.
 
     It is not possible to amend public changesets (see :hg:`help phases`)
     or changesets that have children.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     Returns 0 on success, 1 if nothing changed.
     """
     if opts.get('subrepos'):
         if opts.get('amend'):
             raise util.Abort(_('cannot amend with --subrepos'))
         # Let --subrepos on the command line override config setting.
         ui.setconfig('ui', 'commitsubrepos', True, 'commit')
 
     cmdutil.checkunfinished(repo, commit=True)
 
     branch = repo[None].branch()
     bheads = repo.branchheads(branch)
 
     extra = {}
     if opts.get('close_branch'):
         extra['close'] = 1
 
         if not bheads:
             raise util.Abort(_('can only close branch heads'))
         elif opts.get('amend'):
             if repo.parents()[0].p1().branch() != branch and \
                     repo.parents()[0].p2().branch() != branch:
                 raise util.Abort(_('can only close branch heads'))
 
     if opts.get('amend'):
         if ui.configbool('ui', 'commitsubrepos'):
             raise util.Abort(_('cannot amend with ui.commitsubrepos enabled'))
 
         old = repo['.']
         if not old.mutable():
             raise util.Abort(_('cannot amend public changesets'))
         if len(repo[None].parents()) > 1:
             raise util.Abort(_('cannot amend while merging'))
-        if (not obsolete._enabled) and old.children():
+        allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
+        if not allowunstable and old.children():
             raise util.Abort(_('cannot amend changeset with children'))
 
         # commitfunc is used only for temporary amend commit by cmdutil.amend
         def commitfunc(ui, repo, message, match, opts):
             return repo.commit(message,
                                opts.get('user') or old.user(),
                                opts.get('date') or old.date(),
                                match,
                                extra=extra)
 
         current = repo._bookmarkcurrent
         marks = old.bookmarks()
         node = cmdutil.amend(ui, repo, commitfunc, old, extra, pats, opts)
         if node == old.node():
             ui.status(_("nothing changed\n"))
             return 1
         elif marks:
             ui.debug('moving bookmarks %r from %s to %s\n' %
                      (marks, old.hex(), hex(node)))
             newmarks = repo._bookmarks
             for bm in marks:
                 newmarks[bm] = node
                 if bm == current:
                     bookmarks.setcurrent(repo, bm)
             newmarks.write()
     else:
         def commitfunc(ui, repo, message, match, opts):
             backup = ui.backupconfig('phases', 'new-commit')
             baseui = repo.baseui
             basebackup = baseui.backupconfig('phases', 'new-commit')
             try:
                 if opts.get('secret'):
                     ui.setconfig('phases', 'new-commit', 'secret', 'commit')
                     # Propagate to subrepos
                     baseui.setconfig('phases', 'new-commit', 'secret', 'commit')
 
                 editform = cmdutil.mergeeditform(repo[None], 'commit.normal')
                 editor = cmdutil.getcommiteditor(editform=editform, **opts)
                 return repo.commit(message, opts.get('user'), opts.get('date'),
                                    match,
                                    editor=editor,
                                    extra=extra)
             finally:
                 ui.restoreconfig(backup)
                 repo.baseui.restoreconfig(basebackup)
 
 
         node = cmdutil.commit(ui, repo, commitfunc, pats, opts)
 
         if not node:
             stat = repo.status(match=scmutil.match(repo[None], pats, opts))
             if stat[3]:
                 ui.status(_("nothing changed (%d missing files, see "
                             "'hg status')\n") % len(stat[3]))
             else:
                 ui.status(_("nothing changed\n"))
             return 1
 
     cmdutil.commitstatus(repo, node, branch, bheads, opts)
 
 @command('config|showconfig|debugconfig',
     [('u', 'untrusted', None, _('show untrusted configuration options')),
      ('e', 'edit', None, _('edit user config')),
      ('l', 'local', None, _('edit repository config')),
      ('g', 'global', None, _('edit global config'))],
     _('[-u] [NAME]...'),
     optionalrepo=True)
 def config(ui, repo, *values, **opts):
     """show combined config settings from all hgrc files
 
     With no arguments, print names and values of all config items.
 
     With one argument of the form section.name, print just the value
     of that config item.
 
     With multiple arguments, print names and values of all config
     items with matching section names.
 
     With --edit, start an editor on the user-level config file. With
     --global, edit the system-wide config file. With --local, edit the
     repository-level config file.
 
     With --debug, the source (filename and line number) is printed
     for each config item.
 
     See :hg:`help config` for more information about config files.
 
     Returns 0 on success, 1 if NAME does not exist.
 
     """
 
     if opts.get('edit') or opts.get('local') or opts.get('global'):
         if opts.get('local') and opts.get('global'):
             raise util.Abort(_("can't use --local and --global together"))
 
         if opts.get('local'):
             if not repo:
                 raise util.Abort(_("can't use --local outside a repository"))
             paths = [repo.join('hgrc')]
         elif opts.get('global'):
             paths = scmutil.systemrcpath()
         else:
             paths = scmutil.userrcpath()
 
         for f in paths:
             if os.path.exists(f):
                 break
         else:
             if opts.get('global'):
                 samplehgrc = uimod.samplehgrcs['global']
             elif opts.get('local'):
                 samplehgrc = uimod.samplehgrcs['local']
             else:
                 samplehgrc = uimod.samplehgrcs['user']
 
             f = paths[0]
             fp = open(f, "w")
             fp.write(samplehgrc)
             fp.close()
 
         editor = ui.geteditor()
         util.system("%s \"%s\"" % (editor, f),
                     onerr=util.Abort, errprefix=_("edit failed"),
                     out=ui.fout)
         return
 
     for f in scmutil.rcpath():
         ui.debug('read config from: %s\n' % f)
     untrusted = bool(opts.get('untrusted'))
     if values:
         sections = [v for v in values if '.' not in v]
         items = [v for v in values if '.' in v]
         if len(items) > 1 or items and sections:
             raise util.Abort(_('only one config item permitted'))
     matched = False
     for section, name, value in ui.walkconfig(untrusted=untrusted):
         value = str(value).replace('\n', '\\n')
         sectname = section + '.' + name
         if values:
             for v in values:
                 if v == section:
                     ui.debug('%s: ' %
                              ui.configsource(section, name, untrusted))
                     ui.write('%s=%s\n' % (sectname, value))
                     matched = True
                 elif v == sectname:
                     ui.debug('%s: ' %
                              ui.configsource(section, name, untrusted))
                     ui.write(value, '\n')
                     matched = True
         else:
             ui.debug('%s: ' %
                      ui.configsource(section, name, untrusted))
             ui.write('%s=%s\n' % (sectname, value))
             matched = True
     if matched:
         return 0
     return 1
 
 @command('copy|cp',
     [('A', 'after', None, _('record a copy that has already occurred')),
     ('f', 'force', None, _('forcibly copy over an existing managed file')),
     ] + walkopts + dryrunopts,
     _('[OPTION]... [SOURCE]... DEST'))
 def copy(ui, repo, *pats, **opts):
     """mark files as copied for the next commit
 
     Mark dest as having copies of source files. If dest is a
     directory, copies are put in that directory. If dest is a file,
     the source must be a single file.
 
     By default, this command copies the contents of files as they
     exist in the working directory. If invoked with -A/--after, the
     operation is recorded, but no copying is performed.
 
     This command takes effect with the next commit. To undo a copy
     before that, see :hg:`revert`.
 
     Returns 0 on success, 1 if errors are encountered.
     """
     wlock = repo.wlock(False)
     try:
         return cmdutil.copy(ui, repo, pats, opts)
     finally:
         wlock.release()
 
 @command('debugancestor', [], _('[INDEX] REV1 REV2'), optionalrepo=True)
 def debugancestor(ui, repo, *args):
     """find the ancestor revision of two revisions in a given index"""
     if len(args) == 3:
         index, rev1, rev2 = args
         r = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), index)
         lookup = r.lookup
     elif len(args) == 2:
         if not repo:
             raise util.Abort(_("there is no Mercurial repository here "
                                "(.hg not found)"))
         rev1, rev2 = args
         r = repo.changelog
         lookup = repo.lookup
     else:
         raise util.Abort(_('either two or three arguments required'))
     a = r.ancestor(lookup(rev1), lookup(rev2))
     ui.write("%d:%s\n" % (r.rev(a), hex(a)))
 
 @command('debugbuilddag',
     [('m', 'mergeable-file', None, _('add single file mergeable changes')),
     ('o', 'overwritten-file', None, _('add single file all revs overwrite')),
     ('n', 'new-file', None, _('add new file at each rev'))],
     _('[OPTION]... [TEXT]'))
 def debugbuilddag(ui, repo, text=None,
                   mergeable_file=False,
                   overwritten_file=False,
                   new_file=False):
     """builds a repo with a given DAG from scratch in the current empty repo
 
     The description of the DAG is read from stdin if not given on the
     command line.
 
     Elements:
 
      - "+n" is a linear run of n nodes based on the current default parent
      - "." is a single node based on the current default parent
      - "$" resets the default parent to null (implied at the start);
            otherwise the default parent is always the last node created
      - "<p" sets the default parent to the backref p
      - "*p" is a fork at parent p, which is a backref
      - "*p1/p2" is a merge of parents p1 and p2, which are backrefs
      - "/p2" is a merge of the preceding node and p2
      - ":tag" defines a local tag for the preceding node
      - "@branch" sets the named branch for subsequent nodes
      - "#...\\n" is a comment up to the end of the line
 
     Whitespace between the above elements is ignored.
 
     A backref is either
 
      - a number n, which references the node curr-n, where curr is the current
        node, or
      - the name of a local tag you placed earlier using ":tag", or
      - empty to denote the default parent.
 
     All string valued-elements are either strictly alphanumeric, or must
     be enclosed in double quotes ("..."), with "\\" as escape character.
     """
 
     if text is None:
         ui.status(_("reading DAG from stdin\n"))
         text = ui.fin.read()
 
     cl = repo.changelog
     if len(cl) > 0:
         raise util.Abort(_('repository is not empty'))
 
     # determine number of revs in DAG
     total = 0
     for type, data in dagparser.parsedag(text):
         if type == 'n':
             total += 1
 
     if mergeable_file:
         linesperrev = 2
         # make a file with k lines per rev
         initialmergedlines = [str(i) for i in xrange(0, total * linesperrev)]
         initialmergedlines.append("")
 
     tags = []
 
     lock = tr = None
     try:
         lock = repo.lock()
         tr = repo.transaction("builddag")
 
         at = -1
         atbranch = 'default'
         nodeids = []
         id = 0
         ui.progress(_('building'), id, unit=_('revisions'), total=total)
         for type, data in dagparser.parsedag(text):
             if type == 'n':
                 ui.note(('node %s\n' % str(data)))
                 id, ps = data
 
                 files = []
                 fctxs = {}
 
                 p2 = None
                 if mergeable_file:
                     fn = "mf"
                     p1 = repo[ps[0]]
                     if len(ps) > 1:
                         p2 = repo[ps[1]]
                         pa = p1.ancestor(p2)
                         base, local, other = [x[fn].data() for x in (pa, p1,
                                                                      p2)]
                         m3 = simplemerge.Merge3Text(base, local, other)
                         ml = [l.strip() for l in m3.merge_lines()]
                         ml.append("")
                     elif at > 0:
                         ml = p1[fn].data().split("\n")
                     else:
                         ml = initialmergedlines
                     ml[id * linesperrev] += " r%i" % id
                     mergedtext = "\n".join(ml)
                     files.append(fn)
                     fctxs[fn] = context.memfilectx(repo, fn, mergedtext)
 
                 if overwritten_file:
                     fn = "of"
                     files.append(fn)
                     fctxs[fn] = context.memfilectx(repo, fn, "r%i\n" % id)
 
                 if new_file:
                     fn = "nf%i" % id
                     files.append(fn)
                     fctxs[fn] = context.memfilectx(repo, fn, "r%i\n" % id)
                     if len(ps) > 1:
                         if not p2:
                             p2 = repo[ps[1]]
                         for fn in p2:
                             if fn.startswith("nf"):
                                 files.append(fn)
                                 fctxs[fn] = p2[fn]
 
                 def fctxfn(repo, cx, path):
                     return fctxs.get(path)
 
                 if len(ps) == 0 or ps[0] < 0:
                     pars = [None, None]
                 elif len(ps) == 1:
                     pars = [nodeids[ps[0]], None]
                 else:
                     pars = [nodeids[p] for p in ps]
                 cx = context.memctx(repo, pars, "r%i" % id, files, fctxfn,
                                     date=(id, 0),
                                     user="debugbuilddag",
                                     extra={'branch': atbranch})
                 nodeid = repo.commitctx(cx)
                 nodeids.append(nodeid)
                 at = id
             elif type == 'l':
                 id, name = data
                 ui.note(('tag %s\n' % name))
                 tags.append("%s %s\n" % (hex(repo.changelog.node(id)), name))
             elif type == 'a':
                 ui.note(('branch %s\n' % data))
                 atbranch = data
             ui.progress(_('building'), id, unit=_('revisions'), total=total)
         tr.close()
 
         if tags:
             repo.opener.write("localtags", "".join(tags))
     finally:
         ui.progress(_('building'), None)
         release(tr, lock)
 
 @command('debugbundle',
         [('a', 'all', None, _('show all details'))],
         _('FILE'),
         norepo=True)
 def debugbundle(ui, bundlepath, all=None, **opts):
     """lists the contents of a bundle"""
     f = hg.openpath(ui, bundlepath)
     try:
         gen = exchange.readbundle(ui, f, bundlepath)
         if all:
             ui.write(("format: id, p1, p2, cset, delta base, len(delta)\n"))
 
             def showchunks(named):
                 ui.write("\n%s\n" % named)
                 chain = None
                 while True:
                     chunkdata = gen.deltachunk(chain)
                     if not chunkdata:
                         break
                     node = chunkdata['node']
                     p1 = chunkdata['p1']
                     p2 = chunkdata['p2']
                     cs = chunkdata['cs']
                     deltabase = chunkdata['deltabase']
                     delta = chunkdata['delta']
                     ui.write("%s %s %s %s %s %s\n" %
                              (hex(node), hex(p1), hex(p2),
                               hex(cs), hex(deltabase), len(delta)))
                     chain = node
 
             chunkdata = gen.changelogheader()
             showchunks("changelog")
             chunkdata = gen.manifestheader()
             showchunks("manifest")
             while True:
                 chunkdata = gen.filelogheader()
                 if not chunkdata:
                     break
                 fname = chunkdata['filename']
                 showchunks(fname)
         else:
             chunkdata = gen.changelogheader()
             chain = None
             while True:
                 chunkdata = gen.deltachunk(chain)
                 if not chunkdata:
                     break
                 node = chunkdata['node']
                 ui.write("%s\n" % hex(node))
                 chain = node
     finally:
         f.close()
 
 @command('debugcheckstate', [], '')
 def debugcheckstate(ui, repo):
     """validate the correctness of the current dirstate"""
     parent1, parent2 = repo.dirstate.parents()
     m1 = repo[parent1].manifest()
     m2 = repo[parent2].manifest()
     errors = 0
     for f in repo.dirstate:
         state = repo.dirstate[f]
         if state in "nr" and f not in m1:
             ui.warn(_("%s in state %s, but not in manifest1\n") % (f, state))
             errors += 1
         if state in "a" and f in m1:
             ui.warn(_("%s in state %s, but also in manifest1\n") % (f, state))
             errors += 1
         if state in "m" and f not in m1 and f not in m2:
             ui.warn(_("%s in state %s, but not in either manifest\n") %
                     (f, state))
             errors += 1
     for f in m1:
         state = repo.dirstate[f]
         if state not in "nrm":
             ui.warn(_("%s in manifest1, but listed as state %s") % (f, state))
             errors += 1
     if errors:
         error = _(".hg/dirstate inconsistent with current parent's manifest")
         raise util.Abort(error)
 
 @command('debugcommands', [], _('[COMMAND]'), norepo=True)
 def debugcommands(ui, cmd='', *args):
     """list all available commands and options"""
     for cmd, vals in sorted(table.iteritems()):
         cmd = cmd.split('|')[0].strip('^')
         opts = ', '.join([i[1] for i in vals[1]])
         ui.write('%s: %s\n' % (cmd, opts))
 
 @command('debugcomplete',
     [('o', 'options', None, _('show the command options'))],
     _('[-o] CMD'),
     norepo=True)
 def debugcomplete(ui, cmd='', **opts):
     """returns the completion list associated with the given command"""
 
     if opts.get('options'):
         options = []
         otables = [globalopts]
         if cmd:
             aliases, entry = cmdutil.findcmd(cmd, table, False)
             otables.append(entry[1])
         for t in otables:
             for o in t:
                 if "(DEPRECATED)" in o[3]:
                     continue
                 if o[0]:
                     options.append('-%s' % o[0])
                 options.append('--%s' % o[1])
         ui.write("%s\n" % "\n".join(options))
         return
 
     cmdlist = cmdutil.findpossible(cmd, table)
     if ui.verbose:
         cmdlist = [' '.join(c[0]) for c in cmdlist.values()]
     ui.write("%s\n" % "\n".join(sorted(cmdlist)))
 
 @command('debugdag',
     [('t', 'tags', None, _('use tags as labels')),
     ('b', 'branches', None, _('annotate with branch names')),
     ('', 'dots', None, _('use dots for runs')),
     ('s', 'spaces', None, _('separate elements by spaces'))],
     _('[OPTION]... [FILE [REV]...]'),
     optionalrepo=True)
 def debugdag(ui, repo, file_=None, *revs, **opts):
     """format the changelog or an index DAG as a concise textual description
 
     If you pass a revlog index, the revlog's DAG is emitted. If you list
     revision numbers, they get labeled in the output as rN.
 
     Otherwise, the changelog DAG of the current repo is emitted.
     """
     spaces = opts.get('spaces')
     dots = opts.get('dots')
     if file_:
         rlog = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), file_)
         revs = set((int(r) for r in revs))
         def events():
             for r in rlog:
                 yield 'n', (r, list(p for p in rlog.parentrevs(r)
                                         if p != -1))
                 if r in revs:
                     yield 'l', (r, "r%i" % r)
     elif repo:
         cl = repo.changelog
         tags = opts.get('tags')
         branches = opts.get('branches')
         if tags:
             labels = {}
             for l, n in repo.tags().items():
                 labels.setdefault(cl.rev(n), []).append(l)
         def events():
             b = "default"
             for r in cl:
                 if branches:
                     newb = cl.read(cl.node(r))[5]['branch']
                     if newb != b:
                         yield 'a', newb
                         b = newb
                 yield 'n', (r, list(p for p in cl.parentrevs(r)
                                         if p != -1))
                 if tags:
                     ls = labels.get(r)
                     if ls:
                         for l in ls:
                             yield 'l', (r, l)
     else:
         raise util.Abort(_('need repo for changelog dag'))
 
     for line in dagparser.dagtextlines(events(),
                                        addspaces=spaces,
                                        wraplabels=True,
                                        wrapannotations=True,
                                        wrapnonlinear=dots,
                                        usedots=dots,
                                        maxlinewidth=70):
         ui.write(line)
         ui.write("\n")
 
 @command('debugdata',
     [('c', 'changelog', False, _('open changelog')),
      ('m', 'manifest', False, _('open manifest'))],
     _('-c|-m|FILE REV'))
 def debugdata(ui, repo, file_, rev=None, **opts):
     """dump the contents of a data file revision"""
     if opts.get('changelog') or opts.get('manifest'):
         file_, rev = None, file_
     elif rev is None:
         raise error.CommandError('debugdata', _('invalid arguments'))
     r = cmdutil.openrevlog(repo, 'debugdata', file_, opts)
     try:
         ui.write(r.revision(r.lookup(rev)))
     except KeyError:
         raise util.Abort(_('invalid revision identifier %s') % rev)
 
 @command('debugdate',
     [('e', 'extended', None, _('try extended date formats'))],
     _('[-e] DATE [RANGE]'),
     norepo=True, optionalrepo=True)
 def debugdate(ui, date, range=None, **opts):
     """parse and display a date"""
     if opts["extended"]:
         d = util.parsedate(date, util.extendeddateformats)
     else:
         d = util.parsedate(date)
     ui.write(("internal: %s %s\n") % d)
     ui.write(("standard: %s\n") % util.datestr(d))
     if range:
         m = util.matchdate(range)
         ui.write(("match: %s\n") % m(d[0]))
 
 @command('debugdiscovery',
     [('', 'old', None, _('use old-style discovery')),
     ('', 'nonheads', None,
      _('use old-style discovery with non-heads included')),
     ] + remoteopts,
     _('[-l REV] [-r REV] [-b BRANCH]... [OTHER]'))
 def debugdiscovery(ui, repo, remoteurl="default", **opts):
     """runs the changeset discovery protocol in isolation"""
     remoteurl, branches = hg.parseurl(ui.expandpath(remoteurl),
                                       opts.get('branch'))
     remote = hg.peer(repo, opts, remoteurl)
     ui.status(_('comparing with %s\n') % util.hidepassword(remoteurl))
 
     # make sure tests are repeatable
     random.seed(12323)
 
     def doit(localheads, remoteheads, remote=remote):
         if opts.get('old'):
             if localheads:
                 raise util.Abort('cannot use localheads with old style '
                                  'discovery')
             if not util.safehasattr(remote, 'branches'):
                 # enable in-client legacy support
                 remote = localrepo.locallegacypeer(remote.local())
             common, _in, hds = treediscovery.findcommonincoming(repo, remote,
                                                                 force=True)
             common = set(common)
             if not opts.get('nonheads'):
                 ui.write(("unpruned common: %s\n") %
                          " ".join(sorted(short(n) for n in common)))
                 dag = dagutil.revlogdag(repo.changelog)
                 all = dag.ancestorset(dag.internalizeall(common))
                 common = dag.externalizeall(dag.headsetofconnecteds(all))
         else:
             common, any, hds = setdiscovery.findcommonheads(ui, repo, remote)
         common = set(common)
         rheads = set(hds)
         lheads = set(repo.heads())
         ui.write(("common heads: %s\n") %
                  " ".join(sorted(short(n) for n in common)))
         if lheads <= common:
             ui.write(("local is subset\n"))
         elif rheads <= common:
             ui.write(("remote is subset\n"))
 
     serverlogs = opts.get('serverlog')
     if serverlogs:
         for filename in serverlogs:
             logfile = open(filename, 'r')
             try:
                 line = logfile.readline()
                 while line:
                     parts = line.strip().split(';')
                     op = parts[1]
                     if op == 'cg':
                         pass
                     elif op == 'cgss':
                         doit(parts[2].split(' '), parts[3].split(' '))
                     elif op == 'unb':
                         doit(parts[3].split(' '), parts[2].split(' '))
                     line = logfile.readline()
             finally:
                 logfile.close()
 
     else:
         remoterevs, _checkout = hg.addbranchrevs(repo, remote, branches,
                                                  opts.get('remote_head'))
         localrevs = opts.get('local_head')
         doit(localrevs, remoterevs)
 
 @command('debugfileset',
     [('r', 'rev', '', _('apply the filespec on this revision'), _('REV'))],
     _('[-r REV] FILESPEC'))
 def debugfileset(ui, repo, expr, **opts):
     '''parse and apply a fileset specification'''
     ctx = scmutil.revsingle(repo, opts.get('rev'), None)
     if ui.verbose:
         tree = fileset.parse(expr)[0]
         ui.note(tree, "\n")
 
     for f in ctx.getfileset(expr):
         ui.write("%s\n" % f)
 
 @command('debugfsinfo', [], _('[PATH]'), norepo=True)
 def debugfsinfo(ui, path="."):
     """show information detected about current filesystem"""
     util.writefile('.debugfsinfo', '')
     ui.write(('exec: %s\n') % (util.checkexec(path) and 'yes' or 'no'))
     ui.write(('symlink: %s\n') % (util.checklink(path) and 'yes' or 'no'))
     ui.write(('hardlink: %s\n') % (util.checknlink(path) and 'yes' or 'no'))
     ui.write(('case-sensitive: %s\n') % (util.checkcase('.debugfsinfo')
                                 and 'yes' or 'no'))
     os.unlink('.debugfsinfo')
 
 @command('debuggetbundle',
     [('H', 'head', [], _('id of head node'), _('ID')),
     ('C', 'common', [], _('id of common node'), _('ID')),
     ('t', 'type', 'bzip2', _('bundle compression type to use'), _('TYPE'))],
     _('REPO FILE [-H|-C ID]...'),
     norepo=True)
 def debuggetbundle(ui, repopath, bundlepath, head=None, common=None, **opts):
     """retrieves a bundle from a repo
 
     Every ID must be a full-length hex node id string. Saves the bundle to the
     given file.
     """
     repo = hg.peer(ui, opts, repopath)
     if not repo.capable('getbundle'):
         raise util.Abort("getbundle() not supported by target repository")
     args = {}
     if common:
         args['common'] = [bin(s) for s in common]
     if head:
         args['heads'] = [bin(s) for s in head]
     # TODO: get desired bundlecaps from command line.
     args['bundlecaps'] = None
     bundle = repo.getbundle('debug', **args)
 
     bundletype = opts.get('type', 'bzip2').lower()
     btypes = {'none': 'HG10UN', 'bzip2': 'HG10BZ', 'gzip': 'HG10GZ'}
     bundletype = btypes.get(bundletype)
     if bundletype not in changegroup.bundletypes:
         raise util.Abort(_('unknown bundle type specified with --type'))
     changegroup.writebundle(bundle, bundlepath, bundletype)
 
 @command('debugignore', [], '')
 def debugignore(ui, repo, *values, **opts):
     """display the combined ignore pattern"""
     ignore = repo.dirstate._ignore
     includepat = getattr(ignore, 'includepat', None)
     if includepat is not None:
         ui.write("%s\n" % includepat)
     else:
         raise util.Abort(_("no ignore patterns found"))
 
 @command('debugindex',
     [('c', 'changelog', False, _('open changelog')),
      ('m', 'manifest', False, _('open manifest')),
      ('f', 'format', 0, _('revlog format'), _('FORMAT'))],
     _('[-f FORMAT] -c|-m|FILE'),
     optionalrepo=True)
 def debugindex(ui, repo, file_=None, **opts):
     """dump the contents of an index file"""
     r = cmdutil.openrevlog(repo, 'debugindex', file_, opts)
     format = opts.get('format', 0)
     if format not in (0, 1):
         raise util.Abort(_("unknown format %d") % format)
 
     generaldelta = r.version & revlog.REVLOGGENERALDELTA
     if generaldelta:
         basehdr = ' delta'
     else:
         basehdr = '  base'
 
     if format == 0:
         ui.write("   rev    offset  length " + basehdr + " linkrev"
                  " nodeid       p1           p2\n")
     elif format == 1:
         ui.write("   rev flag   offset   length"
                  "     size " + basehdr + "   link     p1     p2"
                  "       nodeid\n")
 
     for i in r:
         node = r.node(i)
         if generaldelta:
             base = r.deltaparent(i)
         else:
             base = r.chainbase(i)
         if format == 0:
             try:
                 pp = r.parents(node)
             except Exception:
                 pp = [nullid, nullid]
             ui.write("% 6d % 9d % 7d % 6d % 7d %s %s %s\n" % (
                     i, r.start(i), r.length(i), base, r.linkrev(i),
                     short(node), short(pp[0]), short(pp[1])))
         elif format == 1:
             pr = r.parentrevs(i)
             ui.write("% 6d %04x % 8d % 8d % 8d % 6d % 6d % 6d % 6d %s\n" % (
                     i, r.flags(i), r.start(i), r.length(i), r.rawsize(i),
                     base, r.linkrev(i), pr[0], pr[1], short(node)))
 
 @command('debugindexdot', [], _('FILE'), optionalrepo=True)
 def debugindexdot(ui, repo, file_):
     """dump an index DAG as a graphviz dot file"""
     r = None
     if repo:
         filelog = repo.file(file_)
         if len(filelog):
             r = filelog
     if not r:
         r = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), file_)
     ui.write(("digraph G {\n"))
     for i in r:
         node = r.node(i)
         pp = r.parents(node)
         ui.write("\t%d -> %d\n" % (r.rev(pp[0]), i))
         if pp[1] != nullid:
             ui.write("\t%d -> %d\n" % (r.rev(pp[1]), i))
     ui.write("}\n")
 
 @command('debuginstall', [], '', norepo=True)
 def debuginstall(ui):
     '''test Mercurial installation
 
     Returns 0 on success.
     '''
 
     def writetemp(contents):
         (fd, name) = tempfile.mkstemp(prefix="hg-debuginstall-")
         f = os.fdopen(fd, "wb")
         f.write(contents)
         f.close()
         return name
 
     problems = 0
 
     # encoding
     ui.status(_("checking encoding (%s)...\n") % encoding.encoding)
     try:
         encoding.fromlocal("test")
     except util.Abort, inst:
         ui.write(" %s\n" % inst)
         ui.write(_(" (check that your locale is properly set)\n"))
         problems += 1
 
     # Python
     ui.status(_("checking Python executable (%s)\n") % sys.executable)
     ui.status(_("checking Python version (%s)\n")
               % ("%s.%s.%s" % sys.version_info[:3]))
     ui.status(_("checking Python lib (%s)...\n")
               % os.path.dirname(os.__file__))
 
     # compiled modules
     ui.status(_("checking installed modules (%s)...\n")
               % os.path.dirname(__file__))
     try:
         import bdiff, mpatch, base85, osutil
         dir(bdiff), dir(mpatch), dir(base85), dir(osutil) # quiet pyflakes
     except Exception, inst:
         ui.write(" %s\n" % inst)
         ui.write(_(" One or more extensions could not be found"))
         ui.write(_(" (check that you compiled the extensions)\n"))
         problems += 1
 
     # templates
     import templater
     p = templater.templatepaths()
     ui.status(_("checking templates (%s)...\n") % ' '.join(p))
     if p:
         m = templater.templatepath("map-cmdline.default")
         if m:
             # template found, check if it is working
             try:
                 templater.templater(m)
             except Exception, inst:
                 ui.write(" %s\n" % inst)
                 p = None
         else:
             ui.write(_(" template 'default' not found\n"))
             p = None
     else:
         ui.write(_(" no template directories found\n"))
     if not p:
         ui.write(_(" (templates seem to have been installed incorrectly)\n"))
         problems += 1
 
     # editor
     ui.status(_("checking commit editor...\n"))
     editor = ui.geteditor()
     cmdpath = util.findexe(shlex.split(editor)[0])
     if not cmdpath:
         if editor == 'vi':
             ui.write(_(" No commit editor set and can't find vi in PATH\n"))
             ui.write(_(" (specify a commit editor in your configuration"
                        " file)\n"))
         else:
             ui.write(_(" Can't find editor '%s' in PATH\n") % editor)
             ui.write(_(" (specify a commit editor in your configuration"
                        " file)\n"))
             problems += 1
 
     # check username
     ui.status(_("checking username...\n"))
     try:
         ui.username()
     except util.Abort, e:
         ui.write(" %s\n" % e)
         ui.write(_(" (specify a username in your configuration file)\n"))
         problems += 1
 
     if not problems:
         ui.status(_("no problems detected\n"))
     else:
         ui.write(_("%s problems detected,"
                    " please check your install!\n") % problems)
 
     return problems
 
 @command('debugknown', [], _('REPO ID...'), norepo=True)
 def debugknown(ui, repopath, *ids, **opts):
     """test whether node ids are known to a repo
 
     Every ID must be a full-length hex node id string. Returns a list of 0s
     and 1s indicating unknown/known.
     """
     repo = hg.peer(ui, opts, repopath)
     if not repo.capable('known'):
         raise util.Abort("known() not supported by target repository")
     flags = repo.known([bin(s) for s in ids])
     ui.write("%s\n" % ("".join([f and "1" or "0" for f in flags])))
 
 @command('debuglabelcomplete', [], _('LABEL...'))
 def debuglabelcomplete(ui, repo, *args):
     '''complete "labels" - tags, open branch names, bookmark names'''
 
     labels = set()
     labels.update(t[0] for t in repo.tagslist())
     labels.update(repo._bookmarks.keys())
     labels.update(tag for (tag, heads, tip, closed)
                   in repo.branchmap().iterbranches() if not closed)
     completions = set()
     if not args:
         args = ['']
     for a in args:
         completions.update(l for l in labels if l.startswith(a))
     ui.write('\n'.join(sorted(completions)))
     ui.write('\n')
 
 @command('debuglocks',
          [('L', 'force-lock', None, _('free the store lock (DANGEROUS)')),
           ('W', 'force-wlock', None,
            _('free the working state lock (DANGEROUS)'))],
          _(''))
 def debuglocks(ui, repo, **opts):
     """show or modify state of locks
 
     By default, this command will show which locks are held. This
     includes the user and process holding the lock, the amount of time
     the lock has been held, and the machine name where the process is
     running if it's not local.
 
     Locks protect the integrity of Mercurial's data, so should be
     treated with care. System crashes or other interruptions may cause
     locks to not be properly released, though Mercurial will usually
     detect and remove such stale locks automatically.
 
     However, detecting stale locks may not always be possible (for
     instance, on a shared filesystem). Removing locks may also be
     blocked by filesystem permissions.
 
     Returns 0 if no locks are held.
 
     """
 
     if opts.get('force_lock'):
         repo.svfs.unlink('lock')
     if opts.get('force_wlock'):
         repo.vfs.unlink('wlock')
     if opts.get('force_lock') or opts.get('force_lock'):
         return 0
 
     now = time.time()
     held = 0
 
     def report(vfs, name, method):
         # this causes stale locks to get reaped for more accurate reporting
         try:
             l = method(False)
         except error.LockHeld:
             l = None
 
         if l:
             l.release()
         else:
             try:
                 stat = repo.svfs.lstat(name)
                 age = now - stat.st_mtime
                 user = util.username(stat.st_uid)
                 locker = vfs.readlock(name)
                 if ":" in locker:
                     host, pid = locker.split(':')
                     if host == socket.gethostname():
                         locker = 'user %s, process %s' % (user, pid)
                     else:
                         locker = 'user %s, process %s, host %s' \
                                  % (user, pid, host)
                 ui.write("%-6s %s (%ds)\n" % (name + ":", locker, age))
                 return 1
             except OSError, e:
                 if e.errno != errno.ENOENT:
                     raise
 
         ui.write("%-6s free\n" % (name + ":"))
         return 0
 
     held += report(repo.svfs, "lock", repo.lock)
     held += report(repo.vfs, "wlock", repo.wlock)
 
     return held
 
 @command('debugobsolete',
         [('', 'flags', 0, _('markers flag')),
          ('', 'record-parents', False,
           _('record parent information for the precursor')),
          ('r', 'rev', [], _('display markers relevant to REV')),
         ] + commitopts2,
          _('[OBSOLETED [REPLACEMENT] [REPL... ]'))
 def debugobsolete(ui, repo, precursor=None, *successors, **opts):
     """create arbitrary obsolete marker
 
     With no arguments, displays the list of obsolescence markers."""
 
     def parsenodeid(s):
         try:
             # We do not use revsingle/revrange functions here to accept
             # arbitrary node identifiers, possibly not present in the
             # local repository.
             n = bin(s)
             if len(n) != len(nullid):
                 raise TypeError()
             return n
         except TypeError:
             raise util.Abort('changeset references must be full hexadecimal '
                              'node identifiers')
 
     if precursor is not None:
         if opts['rev']:
             raise util.Abort('cannot select revision when creating marker')
         metadata = {}
         metadata['user'] = opts['user'] or ui.username()
         succs = tuple(parsenodeid(succ) for succ in successors)
         l = repo.lock()
         try:
             tr = repo.transaction('debugobsolete')
             try:
                 try:
                     date = opts.get('date')
                     if date:
                         date = util.parsedate(date)
                     else:
                         date = None
                     prec = parsenodeid(precursor)
                     parents = None
                     if opts['record_parents']:
                         if prec not in repo.unfiltered():
                             raise util.Abort('cannot used --record-parents on '
                                              'unknown changesets')
                         parents = repo.unfiltered()[prec].parents()
                         parents = tuple(p.node() for p in parents)
                     repo.obsstore.create(tr, prec, succs, opts['flags'],
                                          parents=parents, date=date,
                                          metadata=metadata)
                     tr.close()
                 except ValueError, exc:
                     raise util.Abort(_('bad obsmarker input: %s') % exc)
             finally:
                 tr.release()
         finally:
             l.release()
     else:
         if opts['rev']:
             revs = scmutil.revrange(repo, opts['rev'])
             nodes = [repo[r].node() for r in revs]
             markers = list(obsolete.getmarkers(repo, nodes=nodes))
             markers.sort(key=lambda x: x._data)
         else:
             markers = obsolete.getmarkers(repo)
 
         for m in markers:
             cmdutil.showmarker(ui, m)
 
 @command('debugpathcomplete',
          [('f', 'full', None, _('complete an entire path')),
           ('n', 'normal', None, _('show only normal files')),
           ('a', 'added', None, _('show only added files')),
           ('r', 'removed', None, _('show only removed files'))],
          _('FILESPEC...'))
 def debugpathcomplete(ui, repo, *specs, **opts):
     '''complete part or all of a tracked path
 
     This command supports shells that offer path name completion. It
     currently completes only files already known to the dirstate.
 
     Completion extends only to the next path segment unless
     --full is specified, in which case entire paths are used.'''
 
     def complete(path, acceptable):
         dirstate = repo.dirstate
         spec = os.path.normpath(os.path.join(os.getcwd(), path))
         rootdir = repo.root + os.sep
         if spec != repo.root and not spec.startswith(rootdir):
             return [], []
         if os.path.isdir(spec):
             spec += '/'
         spec = spec[len(rootdir):]
         fixpaths = os.sep != '/'
         if fixpaths:
             spec = spec.replace(os.sep, '/')
         speclen = len(spec)
         fullpaths = opts['full']
         files, dirs = set(), set()
         adddir, addfile = dirs.add, files.add
         for f, st in dirstate.iteritems():
             if f.startswith(spec) and st[0] in acceptable:
                 if fixpaths:
                     f = f.replace('/', os.sep)
                 if fullpaths:
                     addfile(f)
                     continue
                 s = f.find(os.sep, speclen)
                 if s >= 0:
                     adddir(f[:s])
                 else:
                     addfile(f)
         return files, dirs
 
     acceptable = ''
     if opts['normal']:
         acceptable += 'nm'
     if opts['added']:
         acceptable += 'a'
     if opts['removed']:
         acceptable += 'r'
     cwd = repo.getcwd()
     if not specs:
         specs = ['.']
 
     files, dirs = set(), set()
     for spec in specs:
         f, d = complete(spec, acceptable or 'nmar')
         files.update(f)
         dirs.update(d)
     files.update(dirs)
     ui.write('\n'.join(repo.pathto(p, cwd) for p in sorted(files)))
     ui.write('\n')
 
 @command('debugpushkey', [], _('REPO NAMESPACE [KEY OLD NEW]'), norepo=True)
 def debugpushkey(ui, repopath, namespace, *keyinfo, **opts):
     '''access the pushkey key/value protocol
 
     With two args, list the keys in the given namespace.
 
     With five args, set a key to new if it currently is set to old.
     Reports success or failure.
     '''
 
     target = hg.peer(ui, {}, repopath)
     if keyinfo:
         key, old, new = keyinfo
         r = target.pushkey(namespace, key, old, new)
         ui.status(str(r) + '\n')
         return not r
     else:
         for k, v in sorted(target.listkeys(namespace).iteritems()):
             ui.write("%s\t%s\n" % (k.encode('string-escape'),
                                    v.encode('string-escape')))
 
 @command('debugpvec', [], _('A B'))
 def debugpvec(ui, repo, a, b=None):
     ca = scmutil.revsingle(repo, a)
     cb = scmutil.revsingle(repo, b)
     pa = pvec.ctxpvec(ca)
     pb = pvec.ctxpvec(cb)
     if pa == pb:
         rel = "="
     elif pa > pb:
         rel = ">"
     elif pa < pb:
         rel = "<"
     elif pa | pb:
         rel = "|"
     ui.write(_("a: %s\n") % pa)
     ui.write(_("b: %s\n") % pb)
     ui.write(_("depth(a): %d depth(b): %d\n") % (pa._depth, pb._depth))
     ui.write(_("delta: %d hdist: %d distance: %d relation: %s\n") %
              (abs(pa._depth - pb._depth), pvec._hamming(pa._vec, pb._vec),
               pa.distance(pb), rel))
 
 @command('debugrebuilddirstate|debugrebuildstate',
     [('r', 'rev', '', _('revision to rebuild to'), _('REV'))],
     _('[-r REV]'))
 def debugrebuilddirstate(ui, repo, rev):
     """rebuild the dirstate as it would look like for the given revision
 
     If no revision is specified the first current parent will be used.
 
     The dirstate will be set to the files of the given revision.
     The actual working directory content or existing dirstate
     information such as adds or removes is not considered.
 
     One use of this command is to make the next :hg:`status` invocation
     check the actual file content.
     """
     ctx = scmutil.revsingle(repo, rev)
     wlock = repo.wlock()
     try:
         repo.dirstate.rebuild(ctx.node(), ctx.manifest())
     finally:
         wlock.release()
 
 @command('debugrename',
     [('r', 'rev', '', _('revision to debug'), _('REV'))],
     _('[-r REV] FILE'))
 def debugrename(ui, repo, file1, *pats, **opts):
     """dump rename information"""
 
     ctx = scmutil.revsingle(repo, opts.get('rev'))
     m = scmutil.match(ctx, (file1,) + pats, opts)
     for abs in ctx.walk(m):
         fctx = ctx[abs]
         o = fctx.filelog().renamed(fctx.filenode())
         rel = m.rel(abs)
         if o:
             ui.write(_("%s renamed from %s:%s\n") % (rel, o[0], hex(o[1])))
         else:
             ui.write(_("%s not renamed\n") % rel)
 
 @command('debugrevlog',
     [('c', 'changelog', False, _('open changelog')),
      ('m', 'manifest', False, _('open manifest')),
      ('d', 'dump', False, _('dump index data'))],
     _('-c|-m|FILE'),
     optionalrepo=True)
 def debugrevlog(ui, repo, file_=None, **opts):
     """show data and statistics about a revlog"""
     r = cmdutil.openrevlog(repo, 'debugrevlog', file_, opts)
 
     if opts.get("dump"):
         numrevs = len(r)
         ui.write("# rev p1rev p2rev start   end deltastart base   p1   p2"
                  " rawsize totalsize compression heads chainlen\n")
         ts = 0
         heads = set()
         rindex = r.index
 
         def chainbaseandlen(rev):
             clen = 0
             base = rindex[rev][3]
             while base != rev:
                 clen += 1
                 rev = base
                 base = rindex[rev][3]
             return base, clen
 
         for rev in xrange(numrevs):
             dbase = r.deltaparent(rev)
             if dbase == -1:
                 dbase = rev
             cbase, clen = chainbaseandlen(rev)
             p1, p2 = r.parentrevs(rev)
             rs = r.rawsize(rev)
             ts = ts + rs
             heads -= set(r.parentrevs(rev))
             heads.add(rev)
             ui.write("%5d %5d %5d %5d %5d %10d %4d %4d %4d %7d %9d "
                      "%11d %5d %8d\n" %
                      (rev, p1, p2, r.start(rev), r.end(rev),
                       r.start(dbase), r.start(cbase),
                       r.start(p1), r.start(p2),
                       rs, ts, ts / r.end(rev), len(heads), clen))
         return 0
 
     v = r.version
     format = v & 0xFFFF
     flags = []
     gdelta = False
     if v & revlog.REVLOGNGINLINEDATA:
         flags.append('inline')
     if v & revlog.REVLOGGENERALDELTA:
         gdelta = True
         flags.append('generaldelta')
     if not flags:
         flags = ['(none)']
 
     nummerges = 0
     numfull = 0
     numprev = 0
     nump1 = 0
     nump2 = 0
     numother = 0
     nump1prev = 0
     nump2prev = 0
     chainlengths = []
 
     datasize = [None, 0, 0L]
     fullsize = [None, 0, 0L]
     deltasize = [None, 0, 0L]
 
     def addsize(size, l):
         if l[0] is None or size < l[0]:
             l[0] = size
         if size > l[1]:
             l[1] = size
         l[2] += size
 
     numrevs = len(r)
     for rev in xrange(numrevs):
         p1, p2 = r.parentrevs(rev)
         delta = r.deltaparent(rev)
         if format > 0:
             addsize(r.rawsize(rev), datasize)
         if p2 != nullrev:
             nummerges += 1
         size = r.length(rev)
         if delta == nullrev:
             chainlengths.append(0)
             numfull += 1
             addsize(size, fullsize)
         else:
             chainlengths.append(chainlengths[delta] + 1)
             addsize(size, deltasize)
             if delta == rev - 1:
                 numprev += 1
                 if delta == p1:
                     nump1prev += 1
                 elif delta == p2:
                     nump2prev += 1
             elif delta == p1:
                 nump1 += 1
             elif delta == p2:
                 nump2 += 1
             elif delta != nullrev:
                 numother += 1
 
     # Adjust size min value for empty cases
     for size in (datasize, fullsize, deltasize):
         if size[0] is None:
             size[0] = 0
 
     numdeltas = numrevs - numfull
     numoprev = numprev - nump1prev - nump2prev
     totalrawsize = datasize[2]
     datasize[2] /= numrevs
     fulltotal = fullsize[2]
     fullsize[2] /= numfull
     deltatotal = deltasize[2]
     if numrevs - numfull > 0:
         deltasize[2] /= numrevs - numfull
     totalsize = fulltotal + deltatotal
     avgchainlen = sum(chainlengths) / numrevs
     compratio = totalrawsize / totalsize
 
     basedfmtstr = '%%%dd\n'
     basepcfmtstr = '%%%dd %s(%%5.2f%%%%)\n'
 
     def dfmtstr(max):
         return basedfmtstr % len(str(max))
     def pcfmtstr(max, padding=0):
         return basepcfmtstr % (len(str(max)), ' ' * padding)
 
     def pcfmt(value, total):
         return (value, 100 * float(value) / total)
 
     ui.write(('format : %d\n') % format)
     ui.write(('flags  : %s\n') % ', '.join(flags))
 
     ui.write('\n')
     fmt = pcfmtstr(totalsize)
     fmt2 = dfmtstr(totalsize)
     ui.write(('revisions     : ') + fmt2 % numrevs)
     ui.write(('    merges    : ') + fmt % pcfmt(nummerges, numrevs))
     ui.write(('    normal    : ') + fmt % pcfmt(numrevs - nummerges, numrevs))
     ui.write(('revisions     : ') + fmt2 % numrevs)
     ui.write(('    full      : ') + fmt % pcfmt(numfull, numrevs))
     ui.write(('    deltas    : ') + fmt % pcfmt(numdeltas, numrevs))
     ui.write(('revision size : ') + fmt2 % totalsize)
     ui.write(('    full      : ') + fmt % pcfmt(fulltotal, totalsize))
     ui.write(('    deltas    : ') + fmt % pcfmt(deltatotal, totalsize))
 
     ui.write('\n')
     fmt = dfmtstr(max(avgchainlen, compratio))
     ui.write(('avg chain length  : ') + fmt % avgchainlen)
     ui.write(('compression ratio : ') + fmt % compratio)
 
     if format > 0:
         ui.write('\n')
         ui.write(('uncompressed data size (min/max/avg) : %d / %d / %d\n')
                  % tuple(datasize))
     ui.write(('full revision size (min/max/avg)     : %d / %d / %d\n')
              % tuple(fullsize))
     ui.write(('delta size (min/max/avg)             : %d / %d / %d\n')
              % tuple(deltasize))
 
     if numdeltas > 0:
         ui.write('\n')
         fmt = pcfmtstr(numdeltas)
         fmt2 = pcfmtstr(numdeltas, 4)
         ui.write(('deltas against prev  : ') + fmt % pcfmt(numprev, numdeltas))
         if numprev > 0:
             ui.write(('    where prev = p1  : ') + fmt2 % pcfmt(nump1prev,
                                                               numprev))
             ui.write(('    where prev = p2  : ') + fmt2 % pcfmt(nump2prev,
                                                               numprev))
             ui.write(('    other            : ') + fmt2 % pcfmt(numoprev,
                                                               numprev))
         if gdelta:
             ui.write(('deltas against p1    : ')
                      + fmt % pcfmt(nump1, numdeltas))
             ui.write(('deltas against p2    : ')
                      + fmt % pcfmt(nump2, numdeltas))
             ui.write(('deltas against other : ') + fmt % pcfmt(numother,
                                                              numdeltas))
 
 @command('debugrevspec',
     [('', 'optimize', None, _('print parsed tree after optimizing'))],
     ('REVSPEC'))
 def debugrevspec(ui, repo, expr, **opts):
     """parse and apply a revision specification
 
     Use --verbose to print the parsed tree before and after aliases
     expansion.
     """
     if ui.verbose:
         tree = revset.parse(expr)[0]
         ui.note(revset.prettyformat(tree), "\n")
         newtree = revset.findaliases(ui, tree)
         if newtree != tree:
             ui.note(revset.prettyformat(newtree), "\n")
         if opts["optimize"]:
             weight, optimizedtree = revset.optimize(newtree, True)
             ui.note("* optimized:\n", revset.prettyformat(optimizedtree), "\n")
     func = revset.match(ui, expr)
     for c in func(repo, revset.spanset(repo)):
         ui.write("%s\n" % c)
 
 @command('debugsetparents', [], _('REV1 [REV2]'))
 def debugsetparents(ui, repo, rev1, rev2=None):
     """manually set the parents of the current working directory
 
     This is useful for writing repository conversion tools, but should
     be used with care.
 
     Returns 0 on success.
     """
 
     r1 = scmutil.revsingle(repo, rev1).node()
     r2 = scmutil.revsingle(repo, rev2, 'null').node()
 
     wlock = repo.wlock()
     try:
         repo.dirstate.beginparentchange()
         repo.setparents(r1, r2)
         repo.dirstate.endparentchange()
     finally:
         wlock.release()
 
 @command('debugdirstate|debugstate',
     [('', 'nodates', None, _('do not display the saved mtime')),
     ('', 'datesort', None, _('sort by saved mtime'))],
     _('[OPTION]...'))
 def debugstate(ui, repo, nodates=None, datesort=None):
     """show the contents of the current dirstate"""
     timestr = ""
     showdate = not nodates
     if datesort:
         keyfunc = lambda x: (x[1][3], x[0]) # sort by mtime, then by filename
     else:
         keyfunc = None # sort by filename
     for file_, ent in sorted(repo.dirstate._map.iteritems(), key=keyfunc):
         if showdate:
             if ent[3] == -1:
                 # Pad or slice to locale representation
                 locale_len = len(time.strftime("%Y-%m-%d %H:%M:%S ",
                                                time.localtime(0)))
                 timestr = 'unset'
                 timestr = (timestr[:locale_len] +
                            ' ' * (locale_len - len(timestr)))
             else:
                 timestr = time.strftime("%Y-%m-%d %H:%M:%S ",
                                         time.localtime(ent[3]))
         if ent[1] & 020000:
             mode = 'lnk'
         else:
             mode = '%3o' % (ent[1] & 0777 & ~util.umask)
         ui.write("%c %s %10d %s%s\n" % (ent[0], mode, ent[2], timestr, file_))
     for f in repo.dirstate.copies():
         ui.write(_("copy: %s -> %s\n") % (repo.dirstate.copied(f), f))
 
 @command('debugsub',
     [('r', 'rev', '',
      _('revision to check'), _('REV'))],
     _('[-r REV] [REV]'))
 def debugsub(ui, repo, rev=None):
     ctx = scmutil.revsingle(repo, rev, None)
     for k, v in sorted(ctx.substate.items()):
         ui.write(('path %s\n') % k)
         ui.write((' source   %s\n') % v[0])
         ui.write((' revision %s\n') % v[1])
 
 @command('debugsuccessorssets',
     [],
     _('[REV]'))
 def debugsuccessorssets(ui, repo, *revs):
     """show set of successors for revision
 
     A successors set of changeset A is a consistent group of revisions that
     succeed A. It contains non-obsolete changesets only.
 
     In most cases a changeset A has a single successors set containing a single
     successor (changeset A replaced by A').
 
     A changeset that is made obsolete with no successors are called "pruned".
     Such changesets have no successors sets at all.
 
     A changeset that has been "split" will have a successors set containing
     more than one successor.
 
     A changeset that has been rewritten in multiple different ways is called
     "divergent". Such changesets have multiple successor sets (each of which
     may also be split, i.e. have multiple successors).
 
     Results are displayed as follows::
 
         <rev1>
             <successors-1A>
         <rev2>
             <successors-2A>
             <successors-2B1> <successors-2B2> <successors-2B3>
 
     Here rev2 has two possible (i.e. divergent) successors sets. The first
     holds one element, whereas the second holds three (i.e. the changeset has
     been split).
     """
     # passed to successorssets caching computation from one call to another
     cache = {}
     ctx2str = str
     node2str = short
     if ui.debug():
         def ctx2str(ctx):
             return ctx.hex()
         node2str = hex
     for rev in scmutil.revrange(repo, revs):
         ctx = repo[rev]
         ui.write('%s\n'% ctx2str(ctx))
         for succsset in obsolete.successorssets(repo, ctx.node(), cache):
             if succsset:
                 ui.write('    ')
                 ui.write(node2str(succsset[0]))
                 for node in succsset[1:]:
                     ui.write(' ')
                     ui.write(node2str(node))
             ui.write('\n')
 
 @command('debugwalk', walkopts, _('[OPTION]... [FILE]...'), inferrepo=True)
 def debugwalk(ui, repo, *pats, **opts):
     """show how files match on given patterns"""
     m = scmutil.match(repo[None], pats, opts)
     items = list(repo.walk(m))
     if not items:
         return
     f = lambda fn: fn
     if ui.configbool('ui', 'slash') and os.sep != '/':
         f = lambda fn: util.normpath(fn)
     fmt = 'f  %%-%ds  %%-%ds  %%s' % (
         max([len(abs) for abs in items]),
         max([len(m.rel(abs)) for abs in items]))
     for abs in items:
         line = fmt % (abs, f(m.rel(abs)), m.exact(abs) and 'exact' or '')
         ui.write("%s\n" % line.rstrip())
 
 @command('debugwireargs',
     [('', 'three', '', 'three'),
     ('', 'four', '', 'four'),
     ('', 'five', '', 'five'),
     ] + remoteopts,
     _('REPO [OPTIONS]... [ONE [TWO]]'),
     norepo=True)
 def debugwireargs(ui, repopath, *vals, **opts):
     repo = hg.peer(ui, opts, repopath)
     for opt in remoteopts:
         del opts[opt[1]]
     args = {}
     for k, v in opts.iteritems():
         if v:
             args[k] = v
     # run twice to check that we don't mess up the stream for the next command
     res1 = repo.debugwireargs(*vals, **args)
     res2 = repo.debugwireargs(*vals, **args)
     ui.write("%s\n" % res1)
     if res1 != res2:
         ui.warn("%s\n" % res2)
 
 @command('^diff',
     [('r', 'rev', [], _('revision'), _('REV')),
     ('c', 'change', '', _('change made by revision'), _('REV'))
     ] + diffopts + diffopts2 + walkopts + subrepoopts,
     _('[OPTION]... ([-c REV] | [-r REV1 [-r REV2]]) [FILE]...'),
     inferrepo=True)
 def diff(ui, repo, *pats, **opts):
     """diff repository (or selected files)
 
     Show differences between revisions for the specified files.
 
     Differences between files are shown using the unified diff format.
 
     .. note::
 
        diff may generate unexpected results for merges, as it will
        default to comparing against the working directory's first
        parent changeset if no revisions are specified.
 
     When two revision arguments are given, then changes are shown
     between those revisions. If only one revision is specified then
     that revision is compared to the working directory, and, when no
     revisions are specified, the working directory files are compared
     to its parent.
 
     Alternatively you can specify -c/--change with a revision to see
     the changes in that changeset relative to its first parent.
 
     Without the -a/--text option, diff will avoid generating diffs of
     files it detects as binary. With -a, diff will generate a diff
     anyway, probably with undesirable results.
 
     Use the -g/--git option to generate diffs in the git extended diff
     format. For more information, read :hg:`help diffs`.
 
     .. container:: verbose
 
       Examples:
 
       - compare a file in the current working directory to its parent::
 
           hg diff foo.c
 
       - compare two historical versions of a directory, with rename info::
 
           hg diff --git -r 1.0:1.2 lib/
 
       - get change stats relative to the last change on some date::
 
           hg diff --stat -r "date('may 2')"
 
       - diff all newly-added files that contain a keyword::
 
           hg diff "set:added() and grep(GNU)"
 
       - compare a revision and its parents::
 
           hg diff -c 9353         # compare against first parent
           hg diff -r 9353^:9353   # same using revset syntax
           hg diff -r 9353^2:9353  # compare against the second parent
 
     Returns 0 on success.
     """
 
     revs = opts.get('rev')
     change = opts.get('change')
     stat = opts.get('stat')
     reverse = opts.get('reverse')
 
     if revs and change:
         msg = _('cannot specify --rev and --change at the same time')
         raise util.Abort(msg)
     elif change:
         node2 = scmutil.revsingle(repo, change, None).node()
         node1 = repo[node2].p1().node()
     else:
         node1, node2 = scmutil.revpair(repo, revs)
 
     if reverse:
         node1, node2 = node2, node1
 
     diffopts = patch.diffopts(ui, opts)
     m = scmutil.match(repo[node2], pats, opts)
     cmdutil.diffordiffstat(ui, repo, diffopts, node1, node2, m, stat=stat,
                            listsubrepos=opts.get('subrepos'))
 
 @command('^export',
     [('o', 'output', '',
      _('print output to file with formatted name'), _('FORMAT')),
     ('', 'switch-parent', None, _('diff against the second parent')),
     ('r', 'rev', [], _('revisions to export'), _('REV')),
     ] + diffopts,
     _('[OPTION]... [-o OUTFILESPEC] [-r] [REV]...'))
 def export(ui, repo, *changesets, **opts):
     """dump the header and diffs for one or more changesets
 
     Print the changeset header and diffs for one or more revisions.
     If no revision is given, the parent of the working directory is used.
 
     The information shown in the changeset header is: author, date,
     branch name (if non-default), changeset hash, parent(s) and commit
     comment.
 
     .. note::
 
        export may generate unexpected diff output for merge
        changesets, as it will compare the merge changeset against its
        first parent only.
 
     Output may be to a file, in which case the name of the file is
     given using a format string. The formatting rules are as follows:
 
     :``%%``: literal "%" character
     :``%H``: changeset hash (40 hexadecimal digits)
     :``%N``: number of patches being generated
     :``%R``: changeset revision number
     :``%b``: basename of the exporting repository
     :``%h``: short-form changeset hash (12 hexadecimal digits)
     :``%m``: first line of the commit message (only alphanumeric characters)
     :``%n``: zero-padded sequence number, starting at 1
     :``%r``: zero-padded changeset revision number
 
     Without the -a/--text option, export will avoid generating diffs
     of files it detects as binary. With -a, export will generate a
     diff anyway, probably with undesirable results.
 
     Use the -g/--git option to generate diffs in the git extended diff
     format. See :hg:`help diffs` for more information.
 
     With the --switch-parent option, the diff will be against the
     second parent. It can be useful to review a merge.
 
     .. container:: verbose
 
       Examples:
 
       - use export and import to transplant a bugfix to the current
         branch::
 
           hg export -r 9353 | hg import -
 
       - export all the changesets between two revisions to a file with
         rename information::
 
           hg export --git -r 123:150 > changes.txt
 
       - split outgoing changes into a series of patches with
         descriptive names::
 
           hg export -r "outgoing()" -o "%n-%m.patch"
 
     Returns 0 on success.
     """
     changesets += tuple(opts.get('rev', []))
     if not changesets:
         changesets = ['.']
     revs = scmutil.revrange(repo, changesets)
     if not revs:
         raise util.Abort(_("export requires at least one changeset"))
     if len(revs) > 1:
         ui.note(_('exporting patches:\n'))
     else:
         ui.note(_('exporting patch:\n'))
     cmdutil.export(repo, revs, template=opts.get('output'),
                  switch_parent=opts.get('switch_parent'),
                  opts=patch.diffopts(ui, opts))
 
 @command('files',
     [('r', 'rev', '', _('search the repository as it is in REV'), _('REV')),
      ('0', 'print0', None, _('end filenames with NUL, for use with xargs')),
     ] + walkopts + formatteropts,
     _('[OPTION]... [PATTERN]...'))
 def files(ui, repo, *pats, **opts):
     """list tracked files
 
     Print files under Mercurial control in the working directory or
     specified revision whose names match the given patterns (excluding
     removed files).
 
     If no patterns are given to match, this command prints the names
     of all files under Mercurial control in the working copy.
 
     .. container:: verbose
 
       Examples:
 
       - list all files under the current directory::
 
           hg files .
 
       - shows sizes and flags for current revision::
 
           hg files -vr .
 
       - list all files named README::
 
           hg files -I "**/README"
 
       - list all binary files::
 
           hg files "set:binary()"
 
       - find files containing a regular expression:
 
           hg files "set:grep('bob')"
 
       - search tracked file contents with xargs and grep::
 
           hg files -0 | xargs -0 grep foo
 
     See :hg:'help pattern' and :hg:'help revsets' for more information
     on specifying file patterns.
 
     Returns 0 if a match is found, 1 otherwise.
 
     """
     ctx = scmutil.revsingle(repo, opts.get('rev'), None)
     rev = ctx.rev()
     ret = 1
 
     end = '\n'
     if opts.get('print0'):
         end = '\0'
     fm = ui.formatter('files', opts)
     fmt = '%s' + end
 
     m = scmutil.match(ctx, pats, opts)
     ds = repo.dirstate
     for f in ctx.matches(m):
         if rev is None and ds[f] == 'r':
             continue
         fm.startitem()
         if ui.verbose:
             fc = ctx[f]
             fm.write('size flags', '% 10d % 1s ', fc.size(), fc.flags())
         fm.data(abspath=f)
         fm.write('path', fmt, m.rel(f))
         ret = 0
 
     fm.end()
 
     return ret
 
 @command('^forget', walkopts, _('[OPTION]... FILE...'), inferrepo=True)
 def forget(ui, repo, *pats, **opts):
     """forget the specified files on the next commit
 
     Mark the specified files so they will no longer be tracked
     after the next commit.
 
     This only removes files from the current branch, not from the
     entire project history, and it does not delete them from the
     working directory.
 
     To undo a forget before the next commit, see :hg:`add`.
 
     .. container:: verbose
 
       Examples:
 
       - forget newly-added binary files::
 
           hg forget "set:added() and binary()"
 
       - forget files that would be excluded by .hgignore::
 
           hg forget "set:hgignore()"
 
     Returns 0 on success.
     """
 
     if not pats:
         raise util.Abort(_('no files specified'))
 
     m = scmutil.match(repo[None], pats, opts)
     rejected = cmdutil.forget(ui, repo, m, prefix="", explicitonly=False)[0]
     return rejected and 1 or 0
 
 @command(
     'graft',
     [('r', 'rev', [], _('revisions to graft'), _('REV')),
      ('c', 'continue', False, _('resume interrupted graft')),
      ('e', 'edit', False, _('invoke editor on commit messages')),
      ('', 'log', None, _('append graft info to log message')),
      ('f', 'force', False, _('force graft')),
      ('D', 'currentdate', False,
       _('record the current date as commit date')),
      ('U', 'currentuser', False,
       _('record the current user as committer'), _('DATE'))]
     + commitopts2 + mergetoolopts  + dryrunopts,
     _('[OPTION]... [-r] REV...'))
 def graft(ui, repo, *revs, **opts):
     '''copy changes from other branches onto the current branch
 
     This command uses Mercurial's merge logic to copy individual
     changes from other branches without merging branches in the
     history graph. This is sometimes known as 'backporting' or
     'cherry-picking'. By default, graft will copy user, date, and
     description from the source changesets.
 
     Changesets that are ancestors of the current revision, that have
     already been grafted, or that are merges will be skipped.
 
     If --log is specified, log messages will have a comment appended
     of the form::
 
       (grafted from CHANGESETHASH)
 
     If --force is specified, revisions will be grafted even if they
     are already ancestors of or have been grafted to the destination.
     This is useful when the revisions have since been backed out.
 
     If a graft merge results in conflicts, the graft process is
     interrupted so that the current merge can be manually resolved.
     Once all conflicts are addressed, the graft process can be
     continued with the -c/--continue option.
 
     .. note::
 
       The -c/--continue option does not reapply earlier options, except
       for --force.
 
     .. container:: verbose
 
       Examples:
 
       - copy a single change to the stable branch and edit its description::
 
           hg update stable
           hg graft --edit 9393
 
       - graft a range of changesets with one exception, updating dates::
 
           hg graft -D "2085::2093 and not 2091"
 
       - continue a graft after resolving conflicts::
 
           hg graft -c
 
       - show the source of a grafted changeset::
 
           hg log --debug -r .
 
     See :hg:`help revisions` and :hg:`help revsets` for more about
     specifying revisions.
 
     Returns 0 on successful completion.
     '''
 
     revs = list(revs)
     revs.extend(opts['rev'])
 
     if not opts.get('user') and opts.get('currentuser'):
         opts['user'] = ui.username()
     if not opts.get('date') and opts.get('currentdate'):
         opts['date'] = "%d %d" % util.makedate()
 
     editor = cmdutil.getcommiteditor(editform='graft', **opts)
 
     cont = False
     if opts['continue']:
         cont = True
         if revs:
             raise util.Abort(_("can't specify --continue and revisions"))
         # read in unfinished revisions
         try:
             nodes = repo.opener.read('graftstate').splitlines()
             revs = [repo[node].rev() for node in nodes]
         except IOError, inst:
             if inst.errno != errno.ENOENT:
                 raise
             raise util.Abort(_("no graft state found, can't continue"))
     else:
         cmdutil.checkunfinished(repo)
         cmdutil.bailifchanged(repo)
         if not revs:
             raise util.Abort(_('no revisions specified'))
         revs = scmutil.revrange(repo, revs)
 
     skipped = set()
     # check for merges
     for rev in repo.revs('%ld and merge()', revs):
         ui.warn(_('skipping ungraftable merge revision %s\n') % rev)
         skipped.add(rev)
     revs = [r for r in revs if r not in skipped]
     if not revs:
         return -1
 
     # Don't check in the --continue case, in effect retaining --force across
     # --continues. That's because without --force, any revisions we decided to
     # skip would have been filtered out here, so they wouldn't have made their
     # way to the graftstate. With --force, any revisions we would have otherwise
     # skipped would not have been filtered out, and if they hadn't been applied
     # already, they'd have been in the graftstate.
     if not (cont or opts.get('force')):
         # check for ancestors of dest branch
         crev = repo['.'].rev()
         ancestors = repo.changelog.ancestors([crev], inclusive=True)
         # Cannot use x.remove(y) on smart set, this has to be a list.
         # XXX make this lazy in the future
         revs = list(revs)
         # don't mutate while iterating, create a copy
         for rev in list(revs):
             if rev in ancestors:
                 ui.warn(_('skipping ancestor revision %s\n') % rev)
                 # XXX remove on list is slow
                 revs.remove(rev)
         if not revs:
             return -1
 
         # analyze revs for earlier grafts
         ids = {}
         for ctx in repo.set("%ld", revs):
             ids[ctx.hex()] = ctx.rev()
             n = ctx.extra().get('source')
             if n:
                 ids[n] = ctx.rev()
 
         # check ancestors for earlier grafts
         ui.debug('scanning for duplicate grafts\n')
 
         for rev in repo.changelog.findmissingrevs(revs, [crev]):
             ctx = repo[rev]
             n = ctx.extra().get('source')
             if n in ids:
                 try:
                     r = repo[n].rev()
                 except error.RepoLookupError:
                     r = None
                 if r in revs:
                     ui.warn(_('skipping revision %s (already grafted to %s)\n')
                             % (r, rev))
                     revs.remove(r)
                 elif ids[n] in revs:
                     if r is None:
                         ui.warn(_('skipping already grafted revision %s '
                                   '(%s also has unknown origin %s)\n')
                                 % (ids[n], rev, n))
                     else:
                         ui.warn(_('skipping already grafted revision %s '
                                   '(%s also has origin %d)\n')
                                 % (ids[n], rev, r))
                     revs.remove(ids[n])
             elif ctx.hex() in ids:
                 r = ids[ctx.hex()]
                 ui.warn(_('skipping already grafted revision %s '
                                 '(was grafted from %d)\n') % (r, rev))
                 revs.remove(r)
         if not revs:
             return -1
 
     wlock = repo.wlock()
     try:
         for pos, ctx in enumerate(repo.set("%ld", revs)):
 
             ui.status(_('grafting revision %s\n') % ctx.rev())
             if opts.get('dry_run'):
                 continue
 
             source = ctx.extra().get('source')
             if not source:
                 source = ctx.hex()
             extra = {'source': source}
             user = ctx.user()
             if opts.get('user'):
                 user = opts['user']
             date = ctx.date()
             if opts.get('date'):
                 date = opts['date']
             message = ctx.description()
             if opts.get('log'):
                 message += '\n(grafted from %s)' % ctx.hex()
 
             # we don't merge the first commit when continuing
             if not cont:
                 # perform the graft merge with p1(rev) as 'ancestor'
                 try:
                     # ui.forcemerge is an internal variable, do not document
                     repo.ui.setconfig('ui', 'forcemerge', opts.get('tool', ''),
                                       'graft')
                     stats = mergemod.graft(repo, ctx, ctx.p1(),
                                            ['local', 'graft'])
                 finally:
                     repo.ui.setconfig('ui', 'forcemerge', '', 'graft')
                 # report any conflicts
                 if stats and stats[3] > 0:
                     # write out state for --continue
                     nodelines = [repo[rev].hex() + "\n" for rev in revs[pos:]]
                     repo.opener.write('graftstate', ''.join(nodelines))
                     raise util.Abort(
                         _("unresolved conflicts, can't continue"),
                         hint=_('use hg resolve and hg graft --continue'))
             else:
                 cont = False
 
             # commit
             node = repo.commit(text=message, user=user,
                         date=date, extra=extra, editor=editor)
             if node is None:
                 ui.status(_('graft for revision %s is empty\n') % ctx.rev())
     finally:
         wlock.release()
 
     # remove state when we complete successfully
     if not opts.get('dry_run'):
         util.unlinkpath(repo.join('graftstate'), ignoremissing=True)
 
     return 0
 
 @command('grep',
     [('0', 'print0', None, _('end fields with NUL')),
     ('', 'all', None, _('print all revisions that match')),
     ('a', 'text', None, _('treat all files as text')),
     ('f', 'follow', None,
      _('follow changeset history,'
        ' or file history across copies and renames')),
     ('i', 'ignore-case', None, _('ignore case when matching')),
     ('l', 'files-with-matches', None,
      _('print only filenames and revisions that match')),
     ('n', 'line-number', None, _('print matching line numbers')),
     ('r', 'rev', [],
      _('only search files changed within revision range'), _('REV')),
     ('u', 'user', None, _('list the author (long with -v)')),
     ('d', 'date', None, _('list the date (short with -q)')),
     ] + walkopts,
     _('[OPTION]... PATTERN [FILE]...'),
     inferrepo=True)
 def grep(ui, repo, pattern, *pats, **opts):
     """search for a pattern in specified files and revisions
 
     Search revisions of files for a regular expression.
 
     This command behaves differently than Unix grep. It only accepts
     Python/Perl regexps. It searches repository history, not the
     working directory. It always prints the revision number in which a
     match appears.
 
     By default, grep only prints output for the first revision of a
     file in which it finds a match. To get it to print every revision
     that contains a change in match status ("-" for a match that
     becomes a non-match, or "+" for a non-match that becomes a match),
     use the --all flag.
 
     Returns 0 if a match is found, 1 otherwise.
     """
     reflags = re.M
     if opts.get('ignore_case'):
         reflags |= re.I
     try:
         regexp = util.re.compile(pattern, reflags)
     except re.error, inst:
         ui.warn(_("grep: invalid match pattern: %s\n") % inst)
         return 1
     sep, eol = ':', '\n'
     if opts.get('print0'):
         sep = eol = '\0'
 
     getfile = util.lrucachefunc(repo.file)
 
     def matchlines(body):
         begin = 0
         linenum = 0
         while begin < len(body):
             match = regexp.search(body, begin)
             if not match:
                 break
             mstart, mend = match.span()
             linenum += body.count('\n', begin, mstart) + 1
             lstart = body.rfind('\n', begin, mstart) + 1 or begin
             begin = body.find('\n', mend) + 1 or len(body) + 1
             lend = begin - 1
             yield linenum, mstart - lstart, mend - lstart, body[lstart:lend]
 
     class linestate(object):
         def __init__(self, line, linenum, colstart, colend):
             self.line = line
             self.linenum = linenum
             self.colstart = colstart
             self.colend = colend
 
         def __hash__(self):
             return hash((self.linenum, self.line))
 
         def __eq__(self, other):
             return self.line == other.line
 
         def __iter__(self):
             yield (self.line[:self.colstart], '')
             yield (self.line[self.colstart:self.colend], 'grep.match')
             rest = self.line[self.colend:]
             while rest != '':
                 match = regexp.search(rest)
                 if not match:
                     yield (rest, '')
                     break
                 mstart, mend = match.span()
                 yield (rest[:mstart], '')
                 yield (rest[mstart:mend], 'grep.match')
                 rest = rest[mend:]
 
     matches = {}
     copies = {}
     def grepbody(fn, rev, body):
         matches[rev].setdefault(fn, [])
         m = matches[rev][fn]
         for lnum, cstart, cend, line in matchlines(body):
             s = linestate(line, lnum, cstart, cend)
             m.append(s)
 
     def difflinestates(a, b):
         sm = difflib.SequenceMatcher(None, a, b)
         for tag, alo, ahi, blo, bhi in sm.get_opcodes():
             if tag == 'insert':
                 for i in xrange(blo, bhi):
                     yield ('+', b[i])
             elif tag == 'delete':
                 for i in xrange(alo, ahi):
                     yield ('-', a[i])
             elif tag == 'replace':
                 for i in xrange(alo, ahi):
                     yield ('-', a[i])
                 for i in xrange(blo, bhi):
                     yield ('+', b[i])
 
     def display(fn, ctx, pstates, states):
         rev = ctx.rev()
         datefunc = ui.quiet and util.shortdate or util.datestr
         found = False
         @util.cachefunc
         def binary():
             flog = getfile(fn)
             return util.binary(flog.read(ctx.filenode(fn)))
 
         if opts.get('all'):
             iter = difflinestates(pstates, states)
         else:
             iter = [('', l) for l in states]
         for change, l in iter:
             cols = [(fn, 'grep.filename'), (str(rev), 'grep.rev')]
 
             if opts.get('line_number'):
                 cols.append((str(l.linenum), 'grep.linenumber'))
             if opts.get('all'):
                 cols.append((change, 'grep.change'))
             if opts.get('user'):
                 cols.append((ui.shortuser(ctx.user()), 'grep.user'))
             if opts.get('date'):
                 cols.append((datefunc(ctx.date()), 'grep.date'))
             for col, label in cols[:-1]:
                 ui.write(col, label=label)
                 ui.write(sep, label='grep.sep')
             ui.write(cols[-1][0], label=cols[-1][1])
             if not opts.get('files_with_matches'):
                 ui.write(sep, label='grep.sep')
                 if not opts.get('text') and binary():
                     ui.write(" Binary file matches")
                 else:
                     for s, label in l:
                         ui.write(s, label=label)
             ui.write(eol)
             found = True
             if opts.get('files_with_matches'):
                 break
         return found
 
     skip = {}
     revfiles = {}
     matchfn = scmutil.match(repo[None], pats, opts)
     found = False
     follow = opts.get('follow')
 
     def prep(ctx, fns):
         rev = ctx.rev()
         pctx = ctx.p1()
         parent = pctx.rev()
         matches.setdefault(rev, {})
         matches.setdefault(parent, {})
         files = revfiles.setdefault(rev, [])
         for fn in fns:
             flog = getfile(fn)
             try:
                 fnode = ctx.filenode(fn)
             except error.LookupError:
                 continue
 
             copied = flog.renamed(fnode)
             copy = follow and copied and copied[0]
             if copy:
                 copies.setdefault(rev, {})[fn] = copy
             if fn in skip:
                 if copy:
                     skip[copy] = True
                 continue
             files.append(fn)
 
             if fn not in matches[rev]:
                 grepbody(fn, rev, flog.read(fnode))
 
             pfn = copy or fn
             if pfn not in matches[parent]:
                 try:
                     fnode = pctx.filenode(pfn)
                     grepbody(pfn, parent, flog.read(fnode))
                 except error.LookupError:
                     pass
 
     for ctx in cmdutil.walkchangerevs(repo, matchfn, opts, prep):
         rev = ctx.rev()
         parent = ctx.p1().rev()
         for fn in sorted(revfiles.get(rev, [])):
             states = matches[rev][fn]
             copy = copies.get(rev, {}).get(fn)
             if fn in skip:
                 if copy:
                     skip[copy] = True
                 continue
             pstates = matches.get(parent, {}).get(copy or fn, [])
             if pstates or states:
                 r = display(fn, ctx, pstates, states)
                 found = found or r
                 if r and not opts.get('all'):
                     skip[fn] = True
                     if copy:
                         skip[copy] = True
         del matches[rev]
         del revfiles[rev]
 
     return not found
 
 @command('heads',
     [('r', 'rev', '',
      _('show only heads which are descendants of STARTREV'), _('STARTREV')),
     ('t', 'topo', False, _('show topological heads only')),
     ('a', 'active', False, _('show active branchheads only (DEPRECATED)')),
     ('c', 'closed', False, _('show normal and closed branch heads')),
     ] + templateopts,
     _('[-ct] [-r STARTREV] [REV]...'))
 def heads(ui, repo, *branchrevs, **opts):
     """show branch heads
 
     With no arguments, show all open branch heads in the repository.
     Branch heads are changesets that have no descendants on the
     same branch. They are where development generally takes place and
     are the usual targets for update and merge operations.
 
     If one or more REVs are given, only open branch heads on the
     branches associated with the specified changesets are shown. This
     means that you can use :hg:`heads .` to see the heads on the
     currently checked-out branch.
 
     If -c/--closed is specified, also show branch heads marked closed
     (see :hg:`commit --close-branch`).
 
     If STARTREV is specified, only those heads that are descendants of
     STARTREV will be displayed.
 
     If -t/--topo is specified, named branch mechanics will be ignored and only
     topological heads (changesets with no children) will be shown.
 
     Returns 0 if matching heads are found, 1 if not.
     """
 
     start = None
     if 'rev' in opts:
         start = scmutil.revsingle(repo, opts['rev'], None).node()
 
     if opts.get('topo'):
         heads = [repo[h] for h in repo.heads(start)]
     else:
         heads = []
         for branch in repo.branchmap():
             heads += repo.branchheads(branch, start, opts.get('closed'))
         heads = [repo[h] for h in heads]
 
     if branchrevs:
         branches = set(repo[br].branch() for br in branchrevs)
         heads = [h for h in heads if h.branch() in branches]
 
     if opts.get('active') and branchrevs:
         dagheads = repo.heads(start)
         heads = [h for h in heads if h.node() in dagheads]
 
     if branchrevs:
         haveheads = set(h.branch() for h in heads)
         if branches - haveheads:
             headless = ', '.join(b for b in branches - haveheads)
             msg = _('no open branch heads found on branches %s')
             if opts.get('rev'):
                 msg += _(' (started at %s)') % opts['rev']
             ui.warn((msg + '\n') % headless)
 
     if not heads:
         return 1
 
     heads = sorted(heads, key=lambda x: -x.rev())
     displayer = cmdutil.show_changeset(ui, repo, opts)
     for ctx in heads:
         displayer.show(ctx)
     displayer.close()
 
 @command('help',
     [('e', 'extension', None, _('show only help for extensions')),
      ('c', 'command', None, _('show only help for commands')),
      ('k', 'keyword', '', _('show topics matching keyword')),
      ],
     _('[-ec] [TOPIC]'),
     norepo=True)
 def help_(ui, name=None, **opts):
     """show help for a given topic or a help overview
 
     With no arguments, print a list of commands with short help messages.
 
     Given a topic, extension, or command name, print help for that
     topic.
 
     Returns 0 if successful.
     """
 
     textwidth = min(ui.termwidth(), 80) - 2
 
     keep = []
     if ui.verbose:
         keep.append('verbose')
     if sys.platform.startswith('win'):
         keep.append('windows')
     elif sys.platform == 'OpenVMS':
         keep.append('vms')
     elif sys.platform == 'plan9':
         keep.append('plan9')
     else:
         keep.append('unix')
         keep.append(sys.platform.lower())
 
     section = None
     if name and '.' in name:
         name, section = name.split('.')
 
     text = help.help_(ui, name, **opts)
 
     formatted, pruned = minirst.format(text, textwidth, keep=keep,
                                        section=section)
     if section and not formatted:
         raise util.Abort(_("help section not found"))
 
     if 'verbose' in pruned:
         keep.append('omitted')
     else:
         keep.append('notomitted')
     formatted, pruned = minirst.format(text, textwidth, keep=keep,
                                        section=section)
     ui.write(formatted)
 
 
 @command('identify|id',
     [('r', 'rev', '',
      _('identify the specified revision'), _('REV')),
     ('n', 'num', None, _('show local revision number')),
     ('i', 'id', None, _('show global revision id')),
     ('b', 'branch', None, _('show branch')),
     ('t', 'tags', None, _('show tags')),
     ('B', 'bookmarks', None, _('show bookmarks')),
     ] + remoteopts,
     _('[-nibtB] [-r REV] [SOURCE]'),
     optionalrepo=True)
 def identify(ui, repo, source=None, rev=None,
              num=None, id=None, branch=None, tags=None, bookmarks=None, **opts):
     """identify the working copy or specified revision
 
     Print a summary identifying the repository state at REV using one or
     two parent hash identifiers, followed by a "+" if the working
     directory has uncommitted changes, the branch name (if not default),
     a list of tags, and a list of bookmarks.
 
     When REV is not given, print a summary of the current state of the
     repository.
 
     Specifying a path to a repository root or Mercurial bundle will
     cause lookup to operate on that repository/bundle.
 
     .. container:: verbose
 
       Examples:
 
       - generate a build identifier for the working directory::
 
           hg id --id > build-id.dat
 
       - find the revision corresponding to a tag::
 
           hg id -n -r 1.3
 
       - check the most recent revision of a remote repository::
 
           hg id -r tip http://selenic.com/hg/
 
     Returns 0 if successful.
     """
 
     if not repo and not source:
         raise util.Abort(_("there is no Mercurial repository here "
                            "(.hg not found)"))
 
     hexfunc = ui.debugflag and hex or short
     default = not (num or id or branch or tags or bookmarks)
     output = []
     revs = []
 
     if source:
         source, branches = hg.parseurl(ui.expandpath(source))
         peer = hg.peer(repo or ui, opts, source) # only pass ui when no repo
         repo = peer.local()
         revs, checkout = hg.addbranchrevs(repo, peer, branches, None)
 
     if not repo:
         if num or branch or tags:
             raise util.Abort(
                 _("can't query remote revision number, branch, or tags"))
         if not rev and revs:
             rev = revs[0]
         if not rev:
             rev = "tip"
 
         remoterev = peer.lookup(rev)
         if default or id:
             output = [hexfunc(remoterev)]
 
         def getbms():
             bms = []
 
             if 'bookmarks' in peer.listkeys('namespaces'):
                 hexremoterev = hex(remoterev)
                 bms = [bm for bm, bmr in peer.listkeys('bookmarks').iteritems()
                        if bmr == hexremoterev]
 
             return sorted(bms)
 
         if bookmarks:
             output.extend(getbms())
         elif default and not ui.quiet:
             # multiple bookmarks for a single parent separated by '/'
             bm = '/'.join(getbms())
             if bm:
                 output.append(bm)
     else:
         if not rev:
             ctx = repo[None]
             parents = ctx.parents()
             changed = ""
             if default or id or num:
                 if (util.any(repo.status())
                     or util.any(ctx.sub(s).dirty() for s in ctx.substate)):
                     changed = '+'
             if default or id:
                 output = ["%s%s" %
                   ('+'.join([hexfunc(p.node()) for p in parents]), changed)]
             if num:
                 output.append("%s%s" %
                   ('+'.join([str(p.rev()) for p in parents]), changed))
         else:
             ctx = scmutil.revsingle(repo, rev)
             if default or id:
                 output = [hexfunc(ctx.node())]
             if num:
                 output.append(str(ctx.rev()))
 
         if default and not ui.quiet:
             b = ctx.branch()
             if b != 'default':
                 output.append("(%s)" % b)
 
             # multiple tags for a single parent separated by '/'
             t = '/'.join(ctx.tags())
             if t:
                 output.append(t)
 
             # multiple bookmarks for a single parent separated by '/'
             bm = '/'.join(ctx.bookmarks())
             if bm:
                 output.append(bm)
         else:
             if branch:
                 output.append(ctx.branch())
 
             if tags:
                 output.extend(ctx.tags())
 
             if bookmarks:
                 output.extend(ctx.bookmarks())
 
     ui.write("%s\n" % ' '.join(output))
 
 @command('import|patch',
     [('p', 'strip', 1,
      _('directory strip option for patch. This has the same '
        'meaning as the corresponding patch option'), _('NUM')),
     ('b', 'base', '', _('base path (DEPRECATED)'), _('PATH')),
     ('e', 'edit', False, _('invoke editor on commit messages')),
     ('f', 'force', None,
      _('skip check for outstanding uncommitted changes (DEPRECATED)')),
     ('', 'no-commit', None,
      _("don't commit, just update the working directory")),
     ('', 'bypass', None,
      _("apply patch without touching the working directory")),
     ('', 'partial', None,
      _('commit even if some hunks fail')),
     ('', 'exact', None,
      _('apply patch to the nodes from which it was generated')),
     ('', 'import-branch', None,
      _('use any branch information in patch (implied by --exact)'))] +
     commitopts + commitopts2 + similarityopts,
     _('[OPTION]... PATCH...'))
 def import_(ui, repo, patch1=None, *patches, **opts):
     """import an ordered set of patches
 
     Import a list of patches and commit them individually (unless
     --no-commit is specified).
 
     Because import first applies changes to the working directory,
     import will abort if there are outstanding changes.
 
     You can import a patch straight from a mail message. Even patches
     as attachments work (to use the body part, it must have type
     text/plain or text/x-patch). From and Subject headers of email
     message are used as default committer and commit message. All
     text/plain body parts before first diff are added to commit
     message.
 
     If the imported patch was generated by :hg:`export`, user and
     description from patch override values from message headers and
     body. Values given on command line with -m/--message and -u/--user
     override these.
 
     If --exact is specified, import will set the working directory to
     the parent of each patch before applying it, and will abort if the
     resulting changeset has a different ID than the one recorded in
     the patch. This may happen due to character set problems or other
     deficiencies in the text patch format.
 
     Use --bypass to apply and commit patches directly to the
     repository, not touching the working directory. Without --exact,
     patches will be applied on top of the working directory parent
     revision.
 
     With -s/--similarity, hg will attempt to discover renames and
     copies in the patch in the same way as :hg:`addremove`.
 
     Use --partial to ensure a changeset will be created from the patch
     even if some hunks fail to apply. Hunks that fail to apply will be
     written to a <target-file>.rej file. Conflicts can then be resolved
     by hand before :hg:`commit --amend` is run to update the created
     changeset. This flag exists to let people import patches that
     partially apply without losing the associated metadata (author,
     date, description, ...). Note that when none of the hunk applies
     cleanly, :hg:`import --partial` will create an empty changeset,
     importing only the patch metadata.
 
     To read a patch from standard input, use "-" as the patch name. If
     a URL is specified, the patch will be downloaded from it.
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     .. container:: verbose
 
       Examples:
 
       - import a traditional patch from a website and detect renames::
 
           hg import -s 80 http://example.com/bugfix.patch
 
       - import a changeset from an hgweb server::
 
           hg import http://www.selenic.com/hg/rev/5ca8c111e9aa
 
       - import all the patches in an Unix-style mbox::
 
           hg import incoming-patches.mbox
 
       - attempt to exactly restore an exported changeset (not always
         possible)::
 
           hg import --exact proposed-fix.patch
 
     Returns 0 on success, 1 on partial success (see --partial).
     """
 
     if not patch1:
         raise util.Abort(_('need at least one patch to import'))
 
     patches = (patch1,) + patches
 
     date = opts.get('date')
     if date:
         opts['date'] = util.parsedate(date)
 
     update = not opts.get('bypass')
     if not update and opts.get('no_commit'):
         raise util.Abort(_('cannot use --no-commit with --bypass'))
     try:
         sim = float(opts.get('similarity') or 0)
     except ValueError:
         raise util.Abort(_('similarity must be a number'))
     if sim < 0 or sim > 100:
         raise util.Abort(_('similarity must be between 0 and 100'))
     if sim and not update:
         raise util.Abort(_('cannot use --similarity with --bypass'))
     if opts.get('exact') and opts.get('edit'):
         raise util.Abort(_('cannot use --exact with --edit'))
 
     if update:
         cmdutil.checkunfinished(repo)
     if (opts.get('exact') or not opts.get('force')) and update:
         cmdutil.bailifchanged(repo)
 
     base = opts["base"]
     wlock = lock = tr = None
     msgs = []
     ret = 0
 
 
     try:
         try:
             wlock = repo.wlock()
             repo.dirstate.beginparentchange()
             if not opts.get('no_commit'):
                 lock = repo.lock()
                 tr = repo.transaction('import')
             parents = repo.parents()
             for patchurl in patches:
                 if patchurl == '-':
                     ui.status(_('applying patch from stdin\n'))
                     patchfile = ui.fin
                     patchurl = 'stdin'      # for error message
                 else:
                     patchurl = os.path.join(base, patchurl)
                     ui.status(_('applying %s\n') % patchurl)
                     patchfile = hg.openpath(ui, patchurl)
 
                 haspatch = False
                 for hunk in patch.split(patchfile):
                     (msg, node, rej) = cmdutil.tryimportone(ui, repo, hunk,
                                                             parents, opts,
                                                             msgs, hg.clean)
                     if msg:
                         haspatch = True
                         ui.note(msg + '\n')
                     if update or opts.get('exact'):
                         parents = repo.parents()
                     else:
                         parents = [repo[node]]
                     if rej:
                         ui.write_err(_("patch applied partially\n"))
                         ui.write_err(_("(fix the .rej files and run "
                                        "`hg commit --amend`)\n"))
                         ret = 1
                         break
 
                 if not haspatch:
                     raise util.Abort(_('%s: no diffs found') % patchurl)
 
             if tr:
                 tr.close()
             if msgs:
                 repo.savecommitmessage('\n* * *\n'.join(msgs))
             repo.dirstate.endparentchange()
             return ret
         except: # re-raises
             # wlock.release() indirectly calls dirstate.write(): since
             # we're crashing, we do not want to change the working dir
             # parent after all, so make sure it writes nothing
             repo.dirstate.invalidate()
             raise
     finally:
         if tr:
             tr.release()
         release(lock, wlock)
 
 @command('incoming|in',
     [('f', 'force', None,
      _('run even if remote repository is unrelated')),
     ('n', 'newest-first', None, _('show newest record first')),
     ('', 'bundle', '',
      _('file to store the bundles into'), _('FILE')),
     ('r', 'rev', [], _('a remote changeset intended to be added'), _('REV')),
     ('B', 'bookmarks', False, _("compare bookmarks")),
     ('b', 'branch', [],
      _('a specific branch you would like to pull'), _('BRANCH')),
     ] + logopts + remoteopts + subrepoopts,
     _('[-p] [-n] [-M] [-f] [-r REV]... [--bundle FILENAME] [SOURCE]'))
 def incoming(ui, repo, source="default", **opts):
     """show new changesets found in source
 
     Show new changesets found in the specified path/URL or the default
     pull location. These are the changesets that would have been pulled
     if a pull at the time you issued this command.
 
     For remote repository, using --bundle avoids downloading the
     changesets twice if the incoming is followed by a pull.
 
     See pull for valid source format details.
 
     .. container:: verbose
 
       Examples:
 
       - show incoming changes with patches and full description::
 
           hg incoming -vp
 
       - show incoming changes excluding merges, store a bundle::
 
           hg in -vpM --bundle incoming.hg
           hg pull incoming.hg
 
       - briefly list changes inside a bundle::
 
           hg in changes.hg -T "{desc|firstline}\\n"
 
     Returns 0 if there are incoming changes, 1 otherwise.
     """
     if opts.get('graph'):
         cmdutil.checkunsupportedgraphflags([], opts)
         def display(other, chlist, displayer):
             revdag = cmdutil.graphrevs(other, chlist, opts)
             showparents = [ctx.node() for ctx in repo[None].parents()]
             cmdutil.displaygraph(ui, revdag, displayer, showparents,
                                  graphmod.asciiedges)
 
         hg._incoming(display, lambda: 1, ui, repo, source, opts, buffered=True)
         return 0
 
     if opts.get('bundle') and opts.get('subrepos'):
         raise util.Abort(_('cannot combine --bundle and --subrepos'))
 
     if opts.get('bookmarks'):
         source, branches = hg.parseurl(ui.expandpath(source),
                                        opts.get('branch'))
         other = hg.peer(repo, opts, source)
         if 'bookmarks' not in other.listkeys('namespaces'):
             ui.warn(_("remote doesn't support bookmarks\n"))
             return 0
         ui.status(_('comparing with %s\n') % util.hidepassword(source))
         return bookmarks.diff(ui, repo, other)
 
     repo._subtoppath = ui.expandpath(source)
     try:
         return hg.incoming(ui, repo, source, opts)
     finally:
         del repo._subtoppath
 
 
 @command('^init', remoteopts, _('[-e CMD] [--remotecmd CMD] [DEST]'),
          norepo=True)
 def init(ui, dest=".", **opts):
     """create a new repository in the given directory
 
     Initialize a new repository in the given directory. If the given
     directory does not exist, it will be created.
 
     If no directory is given, the current directory is used.
 
     It is possible to specify an ``ssh://`` URL as the destination.
     See :hg:`help urls` for more information.
 
     Returns 0 on success.
     """
     hg.peer(ui, opts, ui.expandpath(dest), create=True)
 
 @command('locate',
     [('r', 'rev', '', _('search the repository as it is in REV'), _('REV')),
     ('0', 'print0', None, _('end filenames with NUL, for use with xargs')),
     ('f', 'fullpath', None, _('print complete paths from the filesystem root')),
     ] + walkopts,
     _('[OPTION]... [PATTERN]...'))
 def locate(ui, repo, *pats, **opts):
     """locate files matching specific patterns (DEPRECATED)
 
     Print files under Mercurial control in the working directory whose
     names match the given patterns.
 
     By default, this command searches all directories in the working
     directory. To search just the current directory and its
     subdirectories, use "--include .".
 
     If no patterns are given to match, this command prints the names
     of all files under Mercurial control in the working directory.
 
     If you want to feed the output of this command into the "xargs"
     command, use the -0 option to both this command and "xargs". This
     will avoid the problem of "xargs" treating single filenames that
     contain whitespace as multiple filenames.
 
     See :hg:`help files` for a more versatile command.
 
     Returns 0 if a match is found, 1 otherwise.
     """
     end = opts.get('print0') and '\0' or '\n'
     rev = scmutil.revsingle(repo, opts.get('rev'), None).node()
 
     ret = 1
     ctx = repo[rev]
     m = scmutil.match(ctx, pats, opts, default='relglob')
     m.bad = lambda x, y: False
 
     for abs in ctx.matches(m):
         if opts.get('fullpath'):
             ui.write(repo.wjoin(abs), end)
         else:
             ui.write(((pats and m.rel(abs)) or abs), end)
         ret = 0
 
     return ret
 
 @command('^log|history',
     [('f', 'follow', None,
      _('follow changeset history, or file history across copies and renames')),
     ('', 'follow-first', None,
      _('only follow the first parent of merge changesets (DEPRECATED)')),
     ('d', 'date', '', _('show revisions matching date spec'), _('DATE')),
     ('C', 'copies', None, _('show copied files')),
     ('k', 'keyword', [],
      _('do case-insensitive search for a given text'), _('TEXT')),
     ('r', 'rev', [], _('show the specified revision or range'), _('REV')),
     ('', 'removed', None, _('include revisions where files were removed')),
     ('m', 'only-merges', None, _('show only merges (DEPRECATED)')),
     ('u', 'user', [], _('revisions committed by user'), _('USER')),
     ('', 'only-branch', [],
      _('show only changesets within the given named branch (DEPRECATED)'),
      _('BRANCH')),
     ('b', 'branch', [],
      _('show changesets within the given named branch'), _('BRANCH')),
     ('P', 'prune', [],
      _('do not display revision or any of its ancestors'), _('REV')),
     ] + logopts + walkopts,
     _('[OPTION]... [FILE]'),
     inferrepo=True)
 def log(ui, repo, *pats, **opts):
     """show revision history of entire repository or files
 
     Print the revision history of the specified files or the entire
     project.
 
     If no revision range is specified, the default is ``tip:0`` unless
     --follow is set, in which case the working directory parent is
     used as the starting revision.
 
     File history is shown without following rename or copy history of
     files. Use -f/--follow with a filename to follow history across
     renames and copies. --follow without a filename will only show
     ancestors or descendants of the starting revision.
 
     By default this command prints revision number and changeset id,
     tags, non-trivial parents, user, date and time, and a summary for
     each commit. When the -v/--verbose switch is used, the list of
     changed files and full commit message are shown.
 
     With --graph the revisions are shown as an ASCII art DAG with the most
     recent changeset at the top.
     'o' is a changeset, '@' is a working directory parent, 'x' is obsolete,
     and '+' represents a fork where the changeset from the lines below is a
     parent of the 'o' merge on the same line.
 
     .. note::
 
        log -p/--patch may generate unexpected diff output for merge
        changesets, as it will only compare the merge changeset against
        its first parent. Also, only files different from BOTH parents
        will appear in files:.
 
     .. note::
 
        for performance reasons, log FILE may omit duplicate changes
        made on branches and will not show removals or mode changes. To
        see all such changes, use the --removed switch.
 
     .. container:: verbose
 
       Some examples:
 
       - changesets with full descriptions and file lists::
 
           hg log -v
 
       - changesets ancestral to the working directory::
 
           hg log -f
 
       - last 10 commits on the current branch::
 
           hg log -l 10 -b .
 
       - changesets showing all modifications of a file, including removals::
 
           hg log --removed file.c
 
       - all changesets that touch a directory, with diffs, excluding merges::
 
           hg log -Mp lib/
 
       - all revision numbers that match a keyword::
 
           hg log -k bug --template "{rev}\\n"
 
       - list available log templates::
 
           hg log -T list
 
       - check if a given changeset is included in a tagged release::
 
           hg log -r "a21ccf and ancestor(1.9)"
 
       - find all changesets by some user in a date range::
 
           hg log -k alice -d "may 2008 to jul 2008"
 
       - summary of all changesets after the last tag::
 
           hg log -r "last(tagged())::" --template "{desc|firstline}\\n"
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     See :hg:`help revisions` and :hg:`help revsets` for more about
     specifying revisions.
 
     See :hg:`help templates` for more about pre-packaged styles and
     specifying custom templates.
 
     Returns 0 on success.
 
     """
     if opts.get('graph'):
         return cmdutil.graphlog(ui, repo, *pats, **opts)
 
     revs, expr, filematcher = cmdutil.getlogrevs(repo, pats, opts)
     limit = cmdutil.loglimit(opts)
     count = 0
 
     getrenamed = None
     if opts.get('copies'):
         endrev = None
         if opts.get('rev'):
             endrev = scmutil.revrange(repo, opts.get('rev')).max() + 1
         getrenamed = templatekw.getrenamedfn(repo, endrev=endrev)
 
     displayer = cmdutil.show_changeset(ui, repo, opts, buffered=True)
     for rev in revs:
         if count == limit:
             break
         ctx = repo[rev]
         copies = None
         if getrenamed is not None and rev:
             copies = []
             for fn in ctx.files():
                 rename = getrenamed(fn, rev)
                 if rename:
                     copies.append((fn, rename[0]))
         revmatchfn = filematcher and filematcher(ctx.rev()) or None
         displayer.show(ctx, copies=copies, matchfn=revmatchfn)
         if displayer.flush(rev):
             count += 1
 
     displayer.close()
 
 @command('manifest',
     [('r', 'rev', '', _('revision to display'), _('REV')),
      ('', 'all', False, _("list files from all revisions"))]
          + formatteropts,
     _('[-r REV]'))
 def manifest(ui, repo, node=None, rev=None, **opts):
     """output the current or given revision of the project manifest
 
     Print a list of version controlled files for the given revision.
     If no revision is given, the first parent of the working directory
     is used, or the null revision if no revision is checked out.
 
     With -v, print file permissions, symlink and executable bits.
     With --debug, print file revision hashes.
 
     If option --all is specified, the list of all files from all revisions
     is printed. This includes deleted and renamed files.
 
     Returns 0 on success.
     """
 
     fm = ui.formatter('manifest', opts)
 
     if opts.get('all'):
         if rev or node:
             raise util.Abort(_("can't specify a revision with --all"))
 
         res = []
         prefix = "data/"
         suffix = ".i"
         plen = len(prefix)
         slen = len(suffix)
         lock = repo.lock()
         try:
             for fn, b, size in repo.store.datafiles():
                 if size != 0 and fn[-slen:] == suffix and fn[:plen] == prefix:
                     res.append(fn[plen:-slen])
         finally:
             lock.release()
         for f in res:
             fm.startitem()
             fm.write("path", '%s\n', f)
         fm.end()
         return
 
     if rev and node:
         raise util.Abort(_("please specify just one revision"))
 
     if not node:
         node = rev
 
     char = {'l': '@', 'x': '*', '': ''}
     mode = {'l': '644', 'x': '755', '': '644'}
     ctx = scmutil.revsingle(repo, node)
     mf = ctx.manifest()
     for f in ctx:
         fm.startitem()
         fl = ctx[f].flags()
         fm.condwrite(ui.debugflag, 'hash', '%s ', hex(mf[f]))
         fm.condwrite(ui.verbose, 'mode type', '%s %1s ', mode[fl], char[fl])
         fm.write('path', '%s\n', f)
     fm.end()
 
 @command('^merge',
     [('f', 'force', None,
       _('force a merge including outstanding changes (DEPRECATED)')),
     ('r', 'rev', '', _('revision to merge'), _('REV')),
     ('P', 'preview', None,
      _('review revisions to merge (no merge is performed)'))
      ] + mergetoolopts,
     _('[-P] [-f] [[-r] REV]'))
 def merge(ui, repo, node=None, **opts):
     """merge working directory with another revision
 
     The current working directory is updated with all changes made in
     the requested revision since the last common predecessor revision.
 
     Files that changed between either parent are marked as changed for
     the next commit and a commit must be performed before any further
     updates to the repository are allowed. The next commit will have
     two parents.
 
     ``--tool`` can be used to specify the merge tool used for file
     merges. It overrides the HGMERGE environment variable and your
     configuration files. See :hg:`help merge-tools` for options.
 
     If no revision is specified, the working directory's parent is a
     head revision, and the current branch contains exactly one other
     head, the other head is merged with by default. Otherwise, an
     explicit revision with which to merge with must be provided.
 
     :hg:`resolve` must be used to resolve unresolved files.
 
     To undo an uncommitted merge, use :hg:`update --clean .` which
     will check out a clean copy of the original merge parent, losing
     all changes.
 
     Returns 0 on success, 1 if there are unresolved files.
     """
 
     if opts.get('rev') and node:
         raise util.Abort(_("please specify just one revision"))
     if not node:
         node = opts.get('rev')
 
     if node:
         node = scmutil.revsingle(repo, node).node()
 
     if not node and repo._bookmarkcurrent:
         bmheads = repo.bookmarkheads(repo._bookmarkcurrent)
         curhead = repo[repo._bookmarkcurrent].node()
         if len(bmheads) == 2:
             if curhead == bmheads[0]:
                 node = bmheads[1]
             else:
                 node = bmheads[0]
         elif len(bmheads) > 2:
             raise util.Abort(_("multiple matching bookmarks to merge - "
                 "please merge with an explicit rev or bookmark"),
                 hint=_("run 'hg heads' to see all heads"))
         elif len(bmheads) <= 1:
             raise util.Abort(_("no matching bookmark to merge - "
                 "please merge with an explicit rev or bookmark"),
                 hint=_("run 'hg heads' to see all heads"))
 
     if not node and not repo._bookmarkcurrent:
         branch = repo[None].branch()
         bheads = repo.branchheads(branch)
         nbhs = [bh for bh in bheads if not repo[bh].bookmarks()]
 
         if len(nbhs) > 2:
             raise util.Abort(_("branch '%s' has %d heads - "
                                "please merge with an explicit rev")
                              % (branch, len(bheads)),
                              hint=_("run 'hg heads .' to see heads"))
 
         parent = repo.dirstate.p1()
         if len(nbhs) <= 1:
             if len(bheads) > 1:
                 raise util.Abort(_("heads are bookmarked - "
                                    "please merge with an explicit rev"),
                                  hint=_("run 'hg heads' to see all heads"))
             if len(repo.heads()) > 1:
                 raise util.Abort(_("branch '%s' has one head - "
                                    "please merge with an explicit rev")
                                  % branch,
                                  hint=_("run 'hg heads' to see all heads"))
             msg, hint = _('nothing to merge'), None
             if parent != repo.lookup(branch):
                 hint = _("use 'hg update' instead")
             raise util.Abort(msg, hint=hint)
 
         if parent not in bheads:
             raise util.Abort(_('working directory not at a head revision'),
                              hint=_("use 'hg update' or merge with an "
                                     "explicit revision"))
         if parent == nbhs[0]:
             node = nbhs[-1]
         else:
             node = nbhs[0]
 
     if opts.get('preview'):
         # find nodes that are ancestors of p2 but not of p1
         p1 = repo.lookup('.')
         p2 = repo.lookup(node)
         nodes = repo.changelog.findmissing(common=[p1], heads=[p2])
 
         displayer = cmdutil.show_changeset(ui, repo, opts)
         for node in nodes:
             displayer.show(repo[node])
         displayer.close()
         return 0
 
     try:
         # ui.forcemerge is an internal variable, do not document
         repo.ui.setconfig('ui', 'forcemerge', opts.get('tool', ''), 'merge')
         return hg.merge(repo, node, force=opts.get('force'))
     finally:
         ui.setconfig('ui', 'forcemerge', '', 'merge')
 
 @command('outgoing|out',
     [('f', 'force', None, _('run even when the destination is unrelated')),
     ('r', 'rev', [],
      _('a changeset intended to be included in the destination'), _('REV')),
     ('n', 'newest-first', None, _('show newest record first')),
     ('B', 'bookmarks', False, _('compare bookmarks')),
     ('b', 'branch', [], _('a specific branch you would like to push'),
      _('BRANCH')),
     ] + logopts + remoteopts + subrepoopts,
     _('[-M] [-p] [-n] [-f] [-r REV]... [DEST]'))
 def outgoing(ui, repo, dest=None, **opts):
     """show changesets not found in the destination
 
     Show changesets not found in the specified destination repository
     or the default push location. These are the changesets that would
     be pushed if a push was requested.
 
     See pull for details of valid destination formats.
 
     Returns 0 if there are outgoing changes, 1 otherwise.
     """
     if opts.get('graph'):
         cmdutil.checkunsupportedgraphflags([], opts)
         o, other = hg._outgoing(ui, repo, dest, opts)
         if not o:
             cmdutil.outgoinghooks(ui, repo, other, opts, o)
             return
 
         revdag = cmdutil.graphrevs(repo, o, opts)
         displayer = cmdutil.show_changeset(ui, repo, opts, buffered=True)
         showparents = [ctx.node() for ctx in repo[None].parents()]
         cmdutil.displaygraph(ui, revdag, displayer, showparents,
                              graphmod.asciiedges)
         cmdutil.outgoinghooks(ui, repo, other, opts, o)
         return 0
 
     if opts.get('bookmarks'):
         dest = ui.expandpath(dest or 'default-push', dest or 'default')
         dest, branches = hg.parseurl(dest, opts.get('branch'))
         other = hg.peer(repo, opts, dest)
         if 'bookmarks' not in other.listkeys('namespaces'):
             ui.warn(_("remote doesn't support bookmarks\n"))
             return 0
         ui.status(_('comparing with %s\n') % util.hidepassword(dest))
         return bookmarks.diff(ui, other, repo)
 
     repo._subtoppath = ui.expandpath(dest or 'default-push', dest or 'default')
     try:
         return hg.outgoing(ui, repo, dest, opts)
     finally:
         del repo._subtoppath
 
 @command('parents',
     [('r', 'rev', '', _('show parents of the specified revision'), _('REV')),
     ] + templateopts,
     _('[-r REV] [FILE]'),
     inferrepo=True)
 def parents(ui, repo, file_=None, **opts):
     """show the parents of the working directory or revision (DEPRECATED)
 
     Print the working directory's parent revisions. If a revision is
     given via -r/--rev, the parent of that revision will be printed.
     If a file argument is given, the revision in which the file was
     last changed (before the working directory revision or the
     argument to --rev if given) is printed.
 
     See :hg:`summary` and :hg:`help revsets` for related information.
 
     Returns 0 on success.
     """
 
     ctx = scmutil.revsingle(repo, opts.get('rev'), None)
 
     if file_:
         m = scmutil.match(ctx, (file_,), opts)
         if m.anypats() or len(m.files()) != 1:
             raise util.Abort(_('can only specify an explicit filename'))
         file_ = m.files()[0]
         filenodes = []
         for cp in ctx.parents():
             if not cp:
                 continue
             try:
                 filenodes.append(cp.filenode(file_))
             except error.LookupError:
                 pass
         if not filenodes:
             raise util.Abort(_("'%s' not found in manifest!") % file_)
         p = []
         for fn in filenodes:
             fctx = repo.filectx(file_, fileid=fn)
             p.append(fctx.node())
     else:
         p = [cp.node() for cp in ctx.parents()]
 
     displayer = cmdutil.show_changeset(ui, repo, opts)
     for n in p:
         if n != nullid:
             displayer.show(repo[n])
     displayer.close()
 
 @command('paths', [], _('[NAME]'), optionalrepo=True)
 def paths(ui, repo, search=None):
     """show aliases for remote repositories
 
     Show definition of symbolic path name NAME. If no name is given,
     show definition of all available names.
 
     Option -q/--quiet suppresses all output when searching for NAME
     and shows only the path names when listing all definitions.
 
     Path names are defined in the [paths] section of your
     configuration file and in ``/etc/mercurial/hgrc``. If run inside a
     repository, ``.hg/hgrc`` is used, too.
 
     The path names ``default`` and ``default-push`` have a special
     meaning.  When performing a push or pull operation, they are used
     as fallbacks if no location is specified on the command-line.
     When ``default-push`` is set, it will be used for push and
     ``default`` will be used for pull; otherwise ``default`` is used
     as the fallback for both.  When cloning a repository, the clone
     source is written as ``default`` in ``.hg/hgrc``.  Note that
     ``default`` and ``default-push`` apply to all inbound (e.g.
     :hg:`incoming`) and outbound (e.g. :hg:`outgoing`, :hg:`email` and
     :hg:`bundle`) operations.
 
     See :hg:`help urls` for more information.
 
     Returns 0 on success.
     """
     if search:
         for name, path in ui.configitems("paths"):
             if name == search:
                 ui.status("%s\n" % util.hidepassword(path))
                 return
         if not ui.quiet:
             ui.warn(_("not found!\n"))
         return 1
     else:
         for name, path in ui.configitems("paths"):
             if ui.quiet:
                 ui.write("%s\n" % name)
             else:
                 ui.write("%s = %s\n" % (name, util.hidepassword(path)))
 
 @command('phase',
     [('p', 'public', False, _('set changeset phase to public')),
      ('d', 'draft', False, _('set changeset phase to draft')),
      ('s', 'secret', False, _('set changeset phase to secret')),
      ('f', 'force', False, _('allow to move boundary backward')),
      ('r', 'rev', [], _('target revision'), _('REV')),
     ],
     _('[-p|-d|-s] [-f] [-r] REV...'))
 def phase(ui, repo, *revs, **opts):
     """set or show the current phase name
 
     With no argument, show the phase name of specified revisions.
 
     With one of -p/--public, -d/--draft or -s/--secret, change the
     phase value of the specified revisions.
 
     Unless -f/--force is specified, :hg:`phase` won't move changeset from a
     lower phase to an higher phase. Phases are ordered as follows::
 
         public < draft < secret
 
     Returns 0 on success, 1 if no phases were changed or some could not
     be changed.
     """
     # search for a unique phase argument
     targetphase = None
     for idx, name in enumerate(phases.phasenames):
         if opts[name]:
             if targetphase is not None:
                 raise util.Abort(_('only one phase can be specified'))
             targetphase = idx
 
     # look for specified revision
     revs = list(revs)
     revs.extend(opts['rev'])
     if not revs:
         raise util.Abort(_('no revisions specified'))
 
     revs = scmutil.revrange(repo, revs)
 
     lock = None
     ret = 0
     if targetphase is None:
         # display
         for r in revs:
             ctx = repo[r]
             ui.write('%i: %s\n' % (ctx.rev(), ctx.phasestr()))
     else:
         tr = None
         lock = repo.lock()
         try:
             tr = repo.transaction("phase")
             # set phase
             if not revs:
                 raise util.Abort(_('empty revision set'))
             nodes = [repo[r].node() for r in revs]
             # moving revision from public to draft may hide them
             # We have to check result on an unfiltered repository
             unfi = repo.unfiltered()
             getphase = unfi._phasecache.phase
             olddata = [getphase(unfi, r) for r in unfi]
             phases.advanceboundary(repo, tr, targetphase, nodes)
             if opts['force']:
                 phases.retractboundary(repo, tr, targetphase, nodes)
             tr.close()
         finally:
             if tr is not None:
                 tr.release()
             lock.release()
         getphase = unfi._phasecache.phase
         newdata = [getphase(unfi, r) for r in unfi]
         changes = sum(newdata[r] != olddata[r] for r in unfi)
         cl = unfi.changelog
         rejected = [n for n in nodes
                     if newdata[cl.rev(n)] < targetphase]
         if rejected:
             ui.warn(_('cannot move %i changesets to a higher '
                       'phase, use --force\n') % len(rejected))
             ret = 1
         if changes:
             msg = _('phase changed for %i changesets\n') % changes
             if ret:
                 ui.status(msg)
             else:
                 ui.note(msg)
         else:
             ui.warn(_('no phases changed\n'))
             ret = 1
     return ret
 
 def postincoming(ui, repo, modheads, optupdate, checkout):
     if modheads == 0:
         return
     if optupdate:
         checkout, movemarkfrom = bookmarks.calculateupdate(ui, repo, checkout)
         try:
             ret = hg.update(repo, checkout)
         except util.Abort, inst:
             ui.warn(_("not updating: %s\n") % str(inst))
             if inst.hint:
                 ui.warn(_("(%s)\n") % inst.hint)
             return 0
         if not ret and not checkout:
             if bookmarks.update(repo, [movemarkfrom], repo['.'].node()):
                 ui.status(_("updating bookmark %s\n") % repo._bookmarkcurrent)
         return ret
     if modheads > 1:
         currentbranchheads = len(repo.branchheads())
         if currentbranchheads == modheads:
             ui.status(_("(run 'hg heads' to see heads, 'hg merge' to merge)\n"))
         elif currentbranchheads > 1:
             ui.status(_("(run 'hg heads .' to see heads, 'hg merge' to "
                         "merge)\n"))
         else:
             ui.status(_("(run 'hg heads' to see heads)\n"))
     else:
         ui.status(_("(run 'hg update' to get a working copy)\n"))
 
 @command('^pull',
     [('u', 'update', None,
      _('update to new branch head if changesets were pulled')),
     ('f', 'force', None, _('run even when remote repository is unrelated')),
     ('r', 'rev', [], _('a remote changeset intended to be added'), _('REV')),
     ('B', 'bookmark', [], _("bookmark to pull"), _('BOOKMARK')),
     ('b', 'branch', [], _('a specific branch you would like to pull'),
      _('BRANCH')),
     ] + remoteopts,
     _('[-u] [-f] [-r REV]... [-e CMD] [--remotecmd CMD] [SOURCE]'))
 def pull(ui, repo, source="default", **opts):
     """pull changes from the specified source
 
     Pull changes from a remote repository to a local one.
 
     This finds all changes from the repository at the specified path
     or URL and adds them to a local repository (the current one unless
     -R is specified). By default, this does not update the copy of the
     project in the working directory.
 
     Use :hg:`incoming` if you want to see what would have been added
     by a pull at the time you issued this command. If you then decide
     to add those changes to the repository, you should use :hg:`pull
     -r X` where ``X`` is the last changeset listed by :hg:`incoming`.
 
     If SOURCE is omitted, the 'default' path will be used.
     See :hg:`help urls` for more information.
 
     Returns 0 on success, 1 if an update had unresolved files.
     """
     source, branches = hg.parseurl(ui.expandpath(source), opts.get('branch'))
     other = hg.peer(repo, opts, source)
     try:
         ui.status(_('pulling from %s\n') % util.hidepassword(source))
         revs, checkout = hg.addbranchrevs(repo, other, branches,
                                           opts.get('rev'))
 
         remotebookmarks = other.listkeys('bookmarks')
 
         if opts.get('bookmark'):
             if not revs:
                 revs = []
             for b in opts['bookmark']:
                 if b not in remotebookmarks:
                     raise util.Abort(_('remote bookmark %s not found!') % b)
                 revs.append(remotebookmarks[b])
 
         if revs:
             try:
                 revs = [other.lookup(rev) for rev in revs]
             except error.CapabilityError:
                 err = _("other repository doesn't support revision lookup, "
                         "so a rev cannot be specified.")
                 raise util.Abort(err)
 
         modheads = exchange.pull(repo, other, heads=revs,
                                  force=opts.get('force'),
                                  bookmarks=opts.get('bookmark', ())).cgresult
         if checkout:
             checkout = str(repo.changelog.rev(other.lookup(checkout)))
         repo._subtoppath = source
         try:
             ret = postincoming(ui, repo, modheads, opts.get('update'), checkout)
 
         finally:
             del repo._subtoppath
 
     finally:
         other.close()
     return ret
 
 @command('^push',
     [('f', 'force', None, _('force push')),
     ('r', 'rev', [],
      _('a changeset intended to be included in the destination'),
      _('REV')),
     ('B', 'bookmark', [], _("bookmark to push"), _('BOOKMARK')),
     ('b', 'branch', [],
      _('a specific branch you would like to push'), _('BRANCH')),
     ('', 'new-branch', False, _('allow pushing a new branch')),
     ] + remoteopts,
     _('[-f] [-r REV]... [-e CMD] [--remotecmd CMD] [DEST]'))
 def push(ui, repo, dest=None, **opts):
     """push changes to the specified destination
 
     Push changesets from the local repository to the specified
     destination.
 
     This operation is symmetrical to pull: it is identical to a pull
     in the destination repository from the current one.
 
     By default, push will not allow creation of new heads at the
     destination, since multiple heads would make it unclear which head
     to use. In this situation, it is recommended to pull and merge
     before pushing.
 
     Use --new-branch if you want to allow push to create a new named
     branch that is not present at the destination. This allows you to
     only create a new branch without forcing other changes.
 
     .. note::
 
       Extra care should be taken with the -f/--force option,
       which will push all new heads on all branches, an action which will
       almost always cause confusion for collaborators.
 
     If -r/--rev is used, the specified revision and all its ancestors
     will be pushed to the remote repository.
 
     If -B/--bookmark is used, the specified bookmarked revision, its
     ancestors, and the bookmark will be pushed to the remote
     repository.
 
     Please see :hg:`help urls` for important details about ``ssh://``
     URLs. If DESTINATION is omitted, a default path will be used.
 
     Returns 0 if push was successful, 1 if nothing to push.
     """
 
     if opts.get('bookmark'):
         ui.setconfig('bookmarks', 'pushing', opts['bookmark'], 'push')
         for b in opts['bookmark']:
             # translate -B options to -r so changesets get pushed
             if b in repo._bookmarks:
                 opts.setdefault('rev', []).append(b)
             else:
                 # if we try to push a deleted bookmark, translate it to null
                 # this lets simultaneous -r, -b options continue working
                 opts.setdefault('rev', []).append("null")
 
     dest = ui.expandpath(dest or 'default-push', dest or 'default')
     dest, branches = hg.parseurl(dest, opts.get('branch'))
     ui.status(_('pushing to %s\n') % util.hidepassword(dest))
     revs, checkout = hg.addbranchrevs(repo, repo, branches, opts.get('rev'))
     try:
         other = hg.peer(repo, opts, dest)
     except error.RepoError:
         if dest == "default-push":
             raise util.Abort(_("default repository not configured!"),
                     hint=_('see the "path" section in "hg help config"'))
         else:
             raise
 
     if revs:
         revs = [repo.lookup(r) for r in scmutil.revrange(repo, revs)]
 
     repo._subtoppath = dest
     try:
         # push subrepos depth-first for coherent ordering
         c = repo['']
         subs = c.substate # only repos that are committed
         for s in sorted(subs):
             result = c.sub(s).push(opts)
             if result == 0:
                 return not result
     finally:
         del repo._subtoppath
     pushop = exchange.push(repo, other, opts.get('force'), revs=revs,
                            newbranch=opts.get('new_branch'),
                            bookmarks=opts.get('bookmark', ()))
 
     result = not pushop.cgresult
 
     if pushop.bkresult is not None:
         if pushop.bkresult == 2:
             result = 2
         elif not result and pushop.bkresult:
             result = 2
 
     return result
 
 @command('recover', [])
 def recover(ui, repo):
     """roll back an interrupted transaction
 
     Recover from an interrupted commit or pull.
 
     This command tries to fix the repository status after an
     interrupted operation. It should only be necessary when Mercurial
     suggests it.
 
     Returns 0 if successful, 1 if nothing to recover or verify fails.
     """
     if repo.recover():
         return hg.verify(repo)
     return 1
 
 @command('^remove|rm',
     [('A', 'after', None, _('record delete for missing files')),
     ('f', 'force', None,
      _('remove (and delete) file even if added or modified')),
     ] + walkopts,
     _('[OPTION]... FILE...'),
     inferrepo=True)
 def remove(ui, repo, *pats, **opts):
     """remove the specified files on the next commit
 
     Schedule the indicated files for removal from the current branch.
 
     This command schedules the files to be removed at the next commit.
     To undo a remove before that, see :hg:`revert`. To undo added
     files, see :hg:`forget`.
 
     .. container:: verbose
 
       -A/--after can be used to remove only files that have already
       been deleted, -f/--force can be used to force deletion, and -Af
       can be used to remove files from the next revision without
       deleting them from the working directory.
 
       The following table details the behavior of remove for different
       file states (columns) and option combinations (rows). The file
       states are Added [A], Clean [C], Modified [M] and Missing [!]
       (as reported by :hg:`status`). The actions are Warn, Remove
       (from branch) and Delete (from disk):
 
       ========= == == == ==
       opt/state A  C  M  !
       ========= == == == ==
       none      W  RD W  R
       -f        R  RD RD R
       -A        W  W  W  R
       -Af       R  R  R  R
       ========= == == == ==
 
       Note that remove never deletes files in Added [A] state from the
       working directory, not even if option --force is specified.
 
     Returns 0 on success, 1 if any warnings encountered.
     """
 
     ret = 0
     after, force = opts.get('after'), opts.get('force')
     if not pats and not after:
         raise util.Abort(_('no files specified'))
 
     m = scmutil.match(repo[None], pats, opts)
     s = repo.status(match=m, clean=True)
     modified, added, deleted, clean = s[0], s[1], s[3], s[6]
 
     # warn about failure to delete explicit files/dirs
     wctx = repo[None]
     for f in m.files():
         if f in repo.dirstate or f in wctx.dirs():
             continue
         if os.path.exists(m.rel(f)):
             if os.path.isdir(m.rel(f)):
                 ui.warn(_('not removing %s: no tracked files\n') % m.rel(f))
             else:
                 ui.warn(_('not removing %s: file is untracked\n') % m.rel(f))
         # missing files will generate a warning elsewhere
         ret = 1
 
     if force:
         list = modified + deleted + clean + added
     elif after:
         list = deleted
         for f in modified + added + clean:
             ui.warn(_('not removing %s: file still exists\n') % m.rel(f))
             ret = 1
     else:
         list = deleted + clean
         for f in modified:
             ui.warn(_('not removing %s: file is modified (use -f'
                       ' to force removal)\n') % m.rel(f))
             ret = 1
         for f in added:
             ui.warn(_('not removing %s: file has been marked for add'
                       ' (use forget to undo)\n') % m.rel(f))
             ret = 1
 
     for f in sorted(list):
         if ui.verbose or not m.exact(f):
             ui.status(_('removing %s\n') % m.rel(f))
 
     wlock = repo.wlock()
     try:
         if not after:
             for f in list:
                 if f in added:
                     continue # we never unlink added files on remove
                 util.unlinkpath(repo.wjoin(f), ignoremissing=True)
         repo[None].forget(list)
     finally:
         wlock.release()
 
     return ret
 
 @command('rename|move|mv',
     [('A', 'after', None, _('record a rename that has already occurred')),
     ('f', 'force', None, _('forcibly copy over an existing managed file')),
     ] + walkopts + dryrunopts,
     _('[OPTION]... SOURCE... DEST'))
 def rename(ui, repo, *pats, **opts):
     """rename files; equivalent of copy + remove
 
     Mark dest as copies of sources; mark sources for deletion. If dest
     is a directory, copies are put in that directory. If dest is a
     file, there can only be one source.
 
     By default, this command copies the contents of files as they
     exist in the working directory. If invoked with -A/--after, the
     operation is recorded, but no copying is performed.
 
     This command takes effect at the next commit. To undo a rename
     before that, see :hg:`revert`.
 
     Returns 0 on success, 1 if errors are encountered.
     """
     wlock = repo.wlock(False)
     try:
         return cmdutil.copy(ui, repo, pats, opts, rename=True)
     finally:
         wlock.release()
 
 @command('resolve',
     [('a', 'all', None, _('select all unresolved files')),
     ('l', 'list', None, _('list state of files needing merge')),
     ('m', 'mark', None, _('mark files as resolved')),
     ('u', 'unmark', None, _('mark files as unresolved')),
     ('n', 'no-status', None, _('hide status prefix'))]
     + mergetoolopts + walkopts,
     _('[OPTION]... [FILE]...'),
     inferrepo=True)
 def resolve(ui, repo, *pats, **opts):
     """redo merges or set/view the merge status of files
 
     Merges with unresolved conflicts are often the result of
     non-interactive merging using the ``internal:merge`` configuration
     setting, or a command-line merge tool like ``diff3``. The resolve
     command is used to manage the files involved in a merge, after
     :hg:`merge` has been run, and before :hg:`commit` is run (i.e. the
     working directory must have two parents). See :hg:`help
     merge-tools` for information on configuring merge tools.
 
     The resolve command can be used in the following ways:
 
     - :hg:`resolve [--tool TOOL] FILE...`: attempt to re-merge the specified
       files, discarding any previous merge attempts. Re-merging is not
       performed for files already marked as resolved. Use ``--all/-a``
       to select all unresolved files. ``--tool`` can be used to specify
       the merge tool used for the given files. It overrides the HGMERGE
       environment variable and your configuration files.  Previous file
       contents are saved with a ``.orig`` suffix.
 
     - :hg:`resolve -m [FILE]`: mark a file as having been resolved
       (e.g. after having manually fixed-up the files). The default is
       to mark all unresolved files.
 
     - :hg:`resolve -u [FILE]...`: mark a file as unresolved. The
       default is to mark all resolved files.
 
     - :hg:`resolve -l`: list files which had or still have conflicts.
       In the printed list, ``U`` = unresolved and ``R`` = resolved.
 
     Note that Mercurial will not let you commit files with unresolved
     merge conflicts. You must use :hg:`resolve -m ...` before you can
     commit after a conflicting merge.
 
     Returns 0 on success, 1 if any files fail a resolve attempt.
     """
 
     all, mark, unmark, show, nostatus = \
         [opts.get(o) for o in 'all mark unmark list no_status'.split()]
 
     if (show and (mark or unmark)) or (mark and unmark):
         raise util.Abort(_("too many options specified"))
     if pats and all:
         raise util.Abort(_("can't specify --all and patterns"))
     if not (all or pats or show or mark or unmark):
         raise util.Abort(_('no files or directories specified'),
                          hint=('use --all to remerge all files'))
 
     wlock = repo.wlock()
     try:
         ms = mergemod.mergestate(repo)
 
         if not ms.active() and not show:
             raise util.Abort(
                 _('resolve command not applicable when not merging'))
 
         m = scmutil.match(repo[None], pats, opts)
         ret = 0
         didwork = False
 
         for f in ms:
             if not m(f):
                 continue
 
             didwork = True
 
             if show:
                 if nostatus:
                     ui.write("%s\n" % f)
                 else:
                     ui.write("%s %s\n" % (ms[f].upper(), f),
                              label='resolve.' +
                              {'u': 'unresolved', 'r': 'resolved'}[ms[f]])
             elif mark:
                 ms.mark(f, "r")
             elif unmark:
                 ms.mark(f, "u")
             else:
                 wctx = repo[None]
 
                 # backup pre-resolve (merge uses .orig for its own purposes)
                 a = repo.wjoin(f)
                 util.copyfile(a, a + ".resolve")
 
                 try:
                     # resolve file
                     ui.setconfig('ui', 'forcemerge', opts.get('tool', ''),
                                  'resolve')
                     if ms.resolve(f, wctx):
                         ret = 1
                 finally:
                     ui.setconfig('ui', 'forcemerge', '', 'resolve')
                     ms.commit()
 
                 # replace filemerge's .orig file with our resolve file
                 util.rename(a + ".resolve", a + ".orig")
 
         ms.commit()
 
         if not didwork and pats:
             ui.warn(_("arguments do not match paths that need resolving\n"))
 
     finally:
         wlock.release()
 
     # Nudge users into finishing an unfinished operation. We don't print
     # this with the list/show operation because we want list/show to remain
     # machine readable.
     if not list(ms.unresolved()) and not show:
         ui.status(_('(no more unresolved files)\n'))
 
     return ret
 
 @command('revert',
     [('a', 'all', None, _('revert all changes when no arguments given')),
     ('d', 'date', '', _('tipmost revision matching date'), _('DATE')),
     ('r', 'rev', '', _('revert to the specified revision'), _('REV')),
     ('C', 'no-backup', None, _('do not save backup copies of files')),
     ] + walkopts + dryrunopts,
     _('[OPTION]... [-r REV] [NAME]...'))
 def revert(ui, repo, *pats, **opts):
     """restore files to their checkout state
 
     .. note::
 
        To check out earlier revisions, you should use :hg:`update REV`.
        To cancel an uncommitted merge (and lose your changes),
        use :hg:`update --clean .`.
 
     With no revision specified, revert the specified files or directories
     to the contents they had in the parent of the working directory.
     This restores the contents of files to an unmodified
     state and unschedules adds, removes, copies, and renames. If the
     working directory has two parents, you must explicitly specify a
     revision.
 
     Using the -r/--rev or -d/--date options, revert the given files or
     directories to their states as of a specific revision. Because
     revert does not change the working directory parents, this will
     cause these files to appear modified. This can be helpful to "back
     out" some or all of an earlier change. See :hg:`backout` for a
     related method.
 
     Modified files are saved with a .orig suffix before reverting.
     To disable these backups, use --no-backup.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     Returns 0 on success.
     """
 
     if opts.get("date"):
         if opts.get("rev"):
             raise util.Abort(_("you can't specify a revision and a date"))
         opts["rev"] = cmdutil.finddate(ui, repo, opts["date"])
 
     parent, p2 = repo.dirstate.parents()
     if not opts.get('rev') and p2 != nullid:
         # revert after merge is a trap for new users (issue2915)
         raise util.Abort(_('uncommitted merge with no revision specified'),
                          hint=_('use "hg update" or see "hg help revert"'))
 
     ctx = scmutil.revsingle(repo, opts.get('rev'))
 
     if not pats and not opts.get('all'):
         msg = _("no files or directories specified")
         if p2 != nullid:
             hint = _("uncommitted merge, use --all to discard all changes,"
                      " or 'hg update -C .' to abort the merge")
             raise util.Abort(msg, hint=hint)
         dirty = util.any(repo.status())
         node = ctx.node()
         if node != parent:
             if dirty:
                 hint = _("uncommitted changes, use --all to discard all"
                          " changes, or 'hg update %s' to update") % ctx.rev()
             else:
                 hint = _("use --all to revert all files,"
                          " or 'hg update %s' to update") % ctx.rev()
         elif dirty:
             hint = _("uncommitted changes, use --all to discard all changes")
         else:
             hint = _("use --all to revert all files")
         raise util.Abort(msg, hint=hint)
 
     return cmdutil.revert(ui, repo, ctx, (parent, p2), *pats, **opts)
 
 @command('rollback', dryrunopts +
          [('f', 'force', False, _('ignore safety measures'))])
 def rollback(ui, repo, **opts):
     """roll back the last transaction (DANGEROUS) (DEPRECATED)
 
     Please use :hg:`commit --amend` instead of rollback to correct
     mistakes in the last commit.
 
     This command should be used with care. There is only one level of
     rollback, and there is no way to undo a rollback. It will also
     restore the dirstate at the time of the last transaction, losing
     any dirstate changes since that time. This command does not alter
     the working directory.
 
     Transactions are used to encapsulate the effects of all commands
     that create new changesets or propagate existing changesets into a
     repository.
 
     .. container:: verbose
 
       For example, the following commands are transactional, and their
       effects can be rolled back:
 
       - commit
       - import
       - pull
       - push (with this repository as the destination)
       - unbundle
 
       To avoid permanent data loss, rollback will refuse to rollback a
       commit transaction if it isn't checked out. Use --force to
       override this protection.
 
     This command is not intended for use on public repositories. Once
     changes are visible for pull by other users, rolling a transaction
     back locally is ineffective (someone else may already have pulled
     the changes). Furthermore, a race is possible with readers of the
     repository; for example an in-progress pull from the repository
     may fail if a rollback is performed.
 
     Returns 0 on success, 1 if no rollback data is available.
     """
     return repo.rollback(dryrun=opts.get('dry_run'),
                          force=opts.get('force'))
 
 @command('root', [])
 def root(ui, repo):
     """print the root (top) of the current working directory
 
     Print the root directory of the current repository.
 
     Returns 0 on success.
     """
     ui.write(repo.root + "\n")
 
 @command('^serve',
     [('A', 'accesslog', '', _('name of access log file to write to'),
      _('FILE')),
     ('d', 'daemon', None, _('run server in background')),
     ('', 'daemon-pipefds', '', _('used internally by daemon mode'), _('NUM')),
     ('E', 'errorlog', '', _('name of error log file to write to'), _('FILE')),
     # use string type, then we can check if something was passed
     ('p', 'port', '', _('port to listen on (default: 8000)'), _('PORT')),
     ('a', 'address', '', _('address to listen on (default: all interfaces)'),
      _('ADDR')),
     ('', 'prefix', '', _('prefix path to serve from (default: server root)'),
      _('PREFIX')),
     ('n', 'name', '',
      _('name to show in web pages (default: working directory)'), _('NAME')),
     ('', 'web-conf', '',
      _('name of the hgweb config file (see "hg help hgweb")'), _('FILE')),
     ('', 'webdir-conf', '', _('name of the hgweb config file (DEPRECATED)'),
      _('FILE')),
     ('', 'pid-file', '', _('name of file to write process ID to'), _('FILE')),
     ('', 'stdio', None, _('for remote clients')),
     ('', 'cmdserver', '', _('for remote clients'), _('MODE')),
     ('t', 'templates', '', _('web templates to use'), _('TEMPLATE')),
     ('', 'style', '', _('template style to use'), _('STYLE')),
     ('6', 'ipv6', None, _('use IPv6 in addition to IPv4')),
     ('', 'certificate', '', _('SSL certificate file'), _('FILE'))],
     _('[OPTION]...'),
     optionalrepo=True)
 def serve(ui, repo, **opts):
     """start stand-alone webserver
 
     Start a local HTTP repository browser and pull server. You can use
     this for ad-hoc sharing and browsing of repositories. It is
     recommended to use a real web server to serve a repository for
     longer periods of time.
 
     Please note that the server does not implement access control.
     This means that, by default, anybody can read from the server and
     nobody can write to it by default. Set the ``web.allow_push``
     option to ``*`` to allow everybody to push to the server. You
     should use a real web server if you need to authenticate users.
 
     By default, the server logs accesses to stdout and errors to
     stderr. Use the -A/--accesslog and -E/--errorlog options to log to
     files.
 
     To have the server choose a free port number to listen on, specify
     a port number of 0; in this case, the server will print the port
     number it uses.
 
     Returns 0 on success.
     """
 
     if opts["stdio"] and opts["cmdserver"]:
         raise util.Abort(_("cannot use --stdio with --cmdserver"))
 
     if opts["stdio"]:
         if repo is None:
             raise error.RepoError(_("there is no Mercurial repository here"
                                     " (.hg not found)"))
         s = sshserver.sshserver(ui, repo)
         s.serve_forever()
 
     if opts["cmdserver"]:
         s = commandserver.server(ui, repo, opts["cmdserver"])
         return s.serve()
 
     # this way we can check if something was given in the command-line
     if opts.get('port'):
         opts['port'] = util.getport(opts.get('port'))
 
     baseui = repo and repo.baseui or ui
     optlist = ("name templates style address port prefix ipv6"
                " accesslog errorlog certificate encoding")
     for o in optlist.split():
         val = opts.get(o, '')
         if val in (None, ''): # should check against default options instead
             continue
         baseui.setconfig("web", o, val, 'serve')
         if repo and repo.ui != baseui:
             repo.ui.setconfig("web", o, val, 'serve')
 
     o = opts.get('web_conf') or opts.get('webdir_conf')
     if not o:
         if not repo:
             raise error.RepoError(_("there is no Mercurial repository"
                                     " here (.hg not found)"))
         o = repo
 
     app = hgweb.hgweb(o, baseui=baseui)
     service = httpservice(ui, app, opts)
     cmdutil.service(opts, initfn=service.init, runfn=service.run)
 
 class httpservice(object):
     def __init__(self, ui, app, opts):
         self.ui = ui
         self.app = app
         self.opts = opts
 
     def init(self):
         util.setsignalhandler()
         self.httpd = hgweb_server.create_server(self.ui, self.app)
 
         if self.opts['port'] and not self.ui.verbose:
             return
 
         if self.httpd.prefix:
             prefix = self.httpd.prefix.strip('/') + '/'
         else:
             prefix = ''
 
         port = ':%d' % self.httpd.port
         if port == ':80':
             port = ''
 
         bindaddr = self.httpd.addr
         if bindaddr == '0.0.0.0':
             bindaddr = '*'
         elif ':' in bindaddr: # IPv6
             bindaddr = '[%s]' % bindaddr
 
         fqaddr = self.httpd.fqaddr
         if ':' in fqaddr:
             fqaddr = '[%s]' % fqaddr
         if self.opts['port']:
             write = self.ui.status
         else:
             write = self.ui.write
         write(_('listening at http://%s%s/%s (bound to %s:%d)\n') %
               (fqaddr, port, prefix, bindaddr, self.httpd.port))
         self.ui.flush()  # avoid buffering of status message
 
     def run(self):
         self.httpd.serve_forever()
 
 
 @command('^status|st',
     [('A', 'all', None, _('show status of all files')),
     ('m', 'modified', None, _('show only modified files')),
     ('a', 'added', None, _('show only added files')),
     ('r', 'removed', None, _('show only removed files')),
     ('d', 'deleted', None, _('show only deleted (but tracked) files')),
     ('c', 'clean', None, _('show only files without changes')),
     ('u', 'unknown', None, _('show only unknown (not tracked) files')),
     ('i', 'ignored', None, _('show only ignored files')),
     ('n', 'no-status', None, _('hide status prefix')),
     ('C', 'copies', None, _('show source of copied files')),
     ('0', 'print0', None, _('end filenames with NUL, for use with xargs')),
     ('', 'rev', [], _('show difference from revision'), _('REV')),
     ('', 'change', '', _('list the changed files of a revision'), _('REV')),
     ] + walkopts + subrepoopts + formatteropts,
     _('[OPTION]... [FILE]...'),
     inferrepo=True)
 def status(ui, repo, *pats, **opts):
     """show changed files in the working directory
 
     Show status of files in the repository. If names are given, only
     files that match are shown. Files that are clean or ignored or
     the source of a copy/move operation, are not listed unless
     -c/--clean, -i/--ignored, -C/--copies or -A/--all are given.
     Unless options described with "show only ..." are given, the
     options -mardu are used.
 
     Option -q/--quiet hides untracked (unknown and ignored) files
     unless explicitly requested with -u/--unknown or -i/--ignored.
 
     .. note::
 
        status may appear to disagree with diff if permissions have
        changed or a merge has occurred. The standard diff format does
        not report permission changes and diff only reports changes
        relative to one merge parent.
 
     If one revision is given, it is used as the base revision.
     If two revisions are given, the differences between them are
     shown. The --change option can also be used as a shortcut to list
     the changed files of a revision from its first parent.
 
     The codes used to show the status of files are::
 
       M = modified
       A = added
       R = removed
       C = clean
       ! = missing (deleted by non-hg command, but still tracked)
       ? = not tracked
       I = ignored
         = origin of the previous file (with --copies)
 
     .. container:: verbose
 
       Examples:
 
       - show changes in the working directory relative to a
         changeset::
 
           hg status --rev 9353
 
       - show all changes including copies in an existing changeset::
 
           hg status --copies --change 9353
 
       - get a NUL separated list of added files, suitable for xargs::
 
           hg status -an0
 
     Returns 0 on success.
     """
 
     revs = opts.get('rev')
     change = opts.get('change')
 
     if revs and change:
         msg = _('cannot specify --rev and --change at the same time')
         raise util.Abort(msg)
     elif change:
         node2 = scmutil.revsingle(repo, change, None).node()
         node1 = repo[node2].p1().node()
     else:
         node1, node2 = scmutil.revpair(repo, revs)
 
     cwd = (pats and repo.getcwd()) or ''
     end = opts.get('print0') and '\0' or '\n'
     copy = {}
     states = 'modified added removed deleted unknown ignored clean'.split()
     show = [k for k in states if opts.get(k)]
     if opts.get('all'):
         show += ui.quiet and (states[:4] + ['clean']) or states
     if not show:
         show = ui.quiet and states[:4] or states[:5]
 
     stat = repo.status(node1, node2, scmutil.match(repo[node2], pats, opts),
                        'ignored' in show, 'clean' in show, 'unknown' in show,
                        opts.get('subrepos'))
     changestates = zip(states, 'MAR!?IC', stat)
 
     if (opts.get('all') or opts.get('copies')) and not opts.get('no_status'):
         copy = copies.pathcopies(repo[node1], repo[node2])
 
     fm = ui.formatter('status', opts)
     fmt = '%s' + end
     showchar = not opts.get('no_status')
 
     for state, char, files in changestates:
         if state in show:
             label = 'status.' + state
             for f in files:
                 fm.startitem()
                 fm.condwrite(showchar, 'status', '%s ', char, label=label)
                 fm.write('path', fmt, repo.pathto(f, cwd), label=label)
                 if f in copy:
                     fm.write("copy", '  %s' + end, repo.pathto(copy[f], cwd),
                              label='status.copied')
     fm.end()
 
 @command('^summary|sum',
     [('', 'remote', None, _('check for push and pull'))], '[--remote]')
 def summary(ui, repo, **opts):
     """summarize working directory state
 
     This generates a brief summary of the working directory state,
     including parents, branch, commit status, and available updates.
 
     With the --remote option, this will check the default paths for
     incoming and outgoing changes. This can be time-consuming.
 
     Returns 0 on success.
     """
 
     ctx = repo[None]
     parents = ctx.parents()
     pnode = parents[0].node()
     marks = []
 
     for p in parents:
         # label with log.changeset (instead of log.parent) since this
         # shows a working directory parent *changeset*:
         # i18n: column positioning for "hg summary"
         ui.write(_('parent: %d:%s ') % (p.rev(), str(p)),
                  label='log.changeset changeset.%s' % p.phasestr())
         ui.write(' '.join(p.tags()), label='log.tag')
         if p.bookmarks():
             marks.extend(p.bookmarks())
         if p.rev() == -1:
             if not len(repo):
                 ui.write(_(' (empty repository)'))
             else:
                 ui.write(_(' (no revision checked out)'))
         ui.write('\n')
         if p.description():
             ui.status(' ' + p.description().splitlines()[0].strip() + '\n',
                       label='log.summary')
 
     branch = ctx.branch()
     bheads = repo.branchheads(branch)
     # i18n: column positioning for "hg summary"
     m = _('branch: %s\n') % branch
     if branch != 'default':
         ui.write(m, label='log.branch')
     else:
         ui.status(m, label='log.branch')
 
     if marks:
         current = repo._bookmarkcurrent
         # i18n: column positioning for "hg summary"
         ui.write(_('bookmarks:'), label='log.bookmark')
         if current is not None:
             if current in marks:
                 ui.write(' *' + current, label='bookmarks.current')
                 marks.remove(current)
             else:
                 ui.write(' [%s]' % current, label='bookmarks.current')
         for m in marks:
             ui.write(' ' + m, label='log.bookmark')
         ui.write('\n', label='log.bookmark')
 
     status = repo.status(unknown=True)
 
     c = repo.dirstate.copies()
     copied, renamed = [], []
     for d, s in c.iteritems():
         if s in status.removed:
             status.removed.remove(s)
             renamed.append(d)
         else:
             copied.append(d)
         if d in status.added:
             status.added.remove(d)
 
     ms = mergemod.mergestate(repo)
     unresolved = [f for f in ms if ms[f] == 'u']
 
     subs = [s for s in ctx.substate if ctx.sub(s).dirty()]
 
     labels = [(ui.label(_('%d modified'), 'status.modified'), status.modified),
               (ui.label(_('%d added'), 'status.added'), status.added),
               (ui.label(_('%d removed'), 'status.removed'), status.removed),
               (ui.label(_('%d renamed'), 'status.copied'), renamed),
               (ui.label(_('%d copied'), 'status.copied'), copied),
               (ui.label(_('%d deleted'), 'status.deleted'), status.deleted),
               (ui.label(_('%d unknown'), 'status.unknown'), status.unknown),
               (ui.label(_('%d unresolved'), 'resolve.unresolved'), unresolved),
               (ui.label(_('%d subrepos'), 'status.modified'), subs)]
     t = []
     for l, s in labels:
         if s:
             t.append(l % len(s))
 
     t = ', '.join(t)
     cleanworkdir = False
 
     if repo.vfs.exists('updatestate'):
         t += _(' (interrupted update)')
     elif len(parents) > 1:
         t += _(' (merge)')
     elif branch != parents[0].branch():
         t += _(' (new branch)')
     elif (parents[0].closesbranch() and
           pnode in repo.branchheads(branch, closed=True)):
         t += _(' (head closed)')
     elif not (status.modified or status.added or status.removed or renamed or
               copied or subs):
         t += _(' (clean)')
         cleanworkdir = True
     elif pnode not in bheads:
         t += _(' (new branch head)')
 
     if cleanworkdir:
         # i18n: column positioning for "hg summary"
         ui.status(_('commit: %s\n') % t.strip())
     else:
         # i18n: column positioning for "hg summary"
         ui.write(_('commit: %s\n') % t.strip())
 
     # all ancestors of branch heads - all ancestors of parent = new csets
     new = len(repo.changelog.findmissing([pctx.node() for pctx in parents],
                                          bheads))
 
     if new == 0:
         # i18n: column positioning for "hg summary"
         ui.status(_('update: (current)\n'))
     elif pnode not in bheads:
         # i18n: column positioning for "hg summary"
         ui.write(_('update: %d new changesets (update)\n') % new)
     else:
         # i18n: column positioning for "hg summary"
         ui.write(_('update: %d new changesets, %d branch heads (merge)\n') %
                  (new, len(bheads)))
 
     cmdutil.summaryhooks(ui, repo)
 
     if opts.get('remote'):
         needsincoming, needsoutgoing = True, True
     else:
         needsincoming, needsoutgoing = False, False
         for i, o in cmdutil.summaryremotehooks(ui, repo, opts, None):
             if i:
                 needsincoming = True
             if o:
                 needsoutgoing = True
         if not needsincoming and not needsoutgoing:
             return
 
     def getincoming():
         source, branches = hg.parseurl(ui.expandpath('default'))
         sbranch = branches[0]
         try:
             other = hg.peer(repo, {}, source)
         except error.RepoError:
             if opts.get('remote'):
                 raise
             return source, sbranch, None, None, None
         revs, checkout = hg.addbranchrevs(repo, other, branches, None)
         if revs:
             revs = [other.lookup(rev) for rev in revs]
         ui.debug('comparing with %s\n' % util.hidepassword(source))
         repo.ui.pushbuffer()
         commoninc = discovery.findcommonincoming(repo, other, heads=revs)
         repo.ui.popbuffer()
         return source, sbranch, other, commoninc, commoninc[1]
 
     if needsincoming:
         source, sbranch, sother, commoninc, incoming = getincoming()
     else:
         source = sbranch = sother = commoninc = incoming = None
 
     def getoutgoing():
         dest, branches = hg.parseurl(ui.expandpath('default-push', 'default'))
         dbranch = branches[0]
         revs, checkout = hg.addbranchrevs(repo, repo, branches, None)
         if source != dest:
             try:
                 dother = hg.peer(repo, {}, dest)
             except error.RepoError:
                 if opts.get('remote'):
                     raise
                 return dest, dbranch, None, None
             ui.debug('comparing with %s\n' % util.hidepassword(dest))
         elif sother is None:
             # there is no explicit destination peer, but source one is invalid
             return dest, dbranch, None, None
         else:
             dother = sother
         if (source != dest or (sbranch is not None and sbranch != dbranch)):
             common = None
         else:
             common = commoninc
         if revs:
             revs = [repo.lookup(rev) for rev in revs]
         repo.ui.pushbuffer()
         outgoing = discovery.findcommonoutgoing(repo, dother, onlyheads=revs,
                                                 commoninc=common)
         repo.ui.popbuffer()
         return dest, dbranch, dother, outgoing
 
     if needsoutgoing:
         dest, dbranch, dother, outgoing = getoutgoing()
     else:
         dest = dbranch = dother = outgoing = None
 
     if opts.get('remote'):
         t = []
         if incoming:
             t.append(_('1 or more incoming'))
         o = outgoing.missing
         if o:
             t.append(_('%d outgoing') % len(o))
         other = dother or sother
         if 'bookmarks' in other.listkeys('namespaces'):
             lmarks = repo.listkeys('bookmarks')
             rmarks = other.listkeys('bookmarks')
             diff = set(rmarks) - set(lmarks)
             if len(diff) > 0:
                 t.append(_('%d incoming bookmarks') % len(diff))
             diff = set(lmarks) - set(rmarks)
             if len(diff) > 0:
                 t.append(_('%d outgoing bookmarks') % len(diff))
 
         if t:
             # i18n: column positioning for "hg summary"
             ui.write(_('remote: %s\n') % (', '.join(t)))
         else:
             # i18n: column positioning for "hg summary"
             ui.status(_('remote: (synced)\n'))
 
     cmdutil.summaryremotehooks(ui, repo, opts,
                                ((source, sbranch, sother, commoninc),
                                 (dest, dbranch, dother, outgoing)))
 
 @command('tag',
     [('f', 'force', None, _('force tag')),
     ('l', 'local', None, _('make the tag local')),
     ('r', 'rev', '', _('revision to tag'), _('REV')),
     ('', 'remove', None, _('remove a tag')),
     # -l/--local is already there, commitopts cannot be used
     ('e', 'edit', None, _('invoke editor on commit messages')),
     ('m', 'message', '', _('use text as commit message'), _('TEXT')),
     ] + commitopts2,
     _('[-f] [-l] [-m TEXT] [-d DATE] [-u USER] [-r REV] NAME...'))
 def tag(ui, repo, name1, *names, **opts):
     """add one or more tags for the current or given revision
 
     Name a particular revision using <name>.
 
     Tags are used to name particular revisions of the repository and are
     very useful to compare different revisions, to go back to significant
     earlier versions or to mark branch points as releases, etc. Changing
     an existing tag is normally disallowed; use -f/--force to override.
 
     If no revision is given, the parent of the working directory is
     used.
 
     To facilitate version control, distribution, and merging of tags,
     they are stored as a file named ".hgtags" which is managed similarly
     to other project files and can be hand-edited if necessary. This
     also means that tagging creates a new commit. The file
     ".hg/localtags" is used for local tags (not shared among
     repositories).
 
     Tag commits are usually made at the head of a branch. If the parent
     of the working directory is not a branch head, :hg:`tag` aborts; use
     -f/--force to force the tag commit to be based on a non-head
     changeset.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     Since tag names have priority over branch names during revision
     lookup, using an existing branch name as a tag name is discouraged.
 
     Returns 0 on success.
     """
     wlock = lock = None
     try:
         wlock = repo.wlock()
         lock = repo.lock()
         rev_ = "."
         names = [t.strip() for t in (name1,) + names]
         if len(names) != len(set(names)):
             raise util.Abort(_('tag names must be unique'))
         for n in names:
             scmutil.checknewlabel(repo, n, 'tag')
             if not n:
                 raise util.Abort(_('tag names cannot consist entirely of '
                                    'whitespace'))
         if opts.get('rev') and opts.get('remove'):
             raise util.Abort(_("--rev and --remove are incompatible"))
         if opts.get('rev'):
             rev_ = opts['rev']
         message = opts.get('message')
         if opts.get('remove'):
             expectedtype = opts.get('local') and 'local' or 'global'
             for n in names:
                 if not repo.tagtype(n):
                     raise util.Abort(_("tag '%s' does not exist") % n)
                 if repo.tagtype(n) != expectedtype:
                     if expectedtype == 'global':
                         raise util.Abort(_("tag '%s' is not a global tag") % n)
                     else:
                         raise util.Abort(_("tag '%s' is not a local tag") % n)
             rev_ = nullid
             if not message:
                 # we don't translate commit messages
                 message = 'Removed tag %s' % ', '.join(names)
         elif not opts.get('force'):
             for n in names:
                 if n in repo.tags():
                     raise util.Abort(_("tag '%s' already exists "
                                        "(use -f to force)") % n)
         if not opts.get('local'):
             p1, p2 = repo.dirstate.parents()
             if p2 != nullid:
                 raise util.Abort(_('uncommitted merge'))
             bheads = repo.branchheads()
             if not opts.get('force') and bheads and p1 not in bheads:
                 raise util.Abort(_('not at a branch head (use -f to force)'))
         r = scmutil.revsingle(repo, rev_).node()
 
         if not message:
             # we don't translate commit messages
             message = ('Added tag %s for changeset %s' %
                        (', '.join(names), short(r)))
 
         date = opts.get('date')
         if date:
             date = util.parsedate(date)
 
         if opts.get('remove'):
             editform = 'tag.remove'
         else:
             editform = 'tag.add'
         editor = cmdutil.getcommiteditor(editform=editform, **opts)
 
         # don't allow tagging the null rev
         if (not opts.get('remove') and
             scmutil.revsingle(repo, rev_).rev() == nullrev):
             raise util.Abort(_("cannot tag null revision"))
 
         repo.tag(names, r, message, opts.get('local'), opts.get('user'), date,
                  editor=editor)
     finally:
         release(lock, wlock)
 
 @command('tags', formatteropts, '')
 def tags(ui, repo, **opts):
     """list repository tags
 
     This lists both regular and local tags. When the -v/--verbose
     switch is used, a third column "local" is printed for local tags.
 
     Returns 0 on success.
     """
 
     fm = ui.formatter('tags', opts)
     hexfunc = fm.hexfunc
     tagtype = ""
 
     for t, n in reversed(repo.tagslist()):
         hn = hexfunc(n)
         label = 'tags.normal'
         tagtype = ''
         if repo.tagtype(t) == 'local':
             label = 'tags.local'
             tagtype = 'local'
 
         fm.startitem()
         fm.write('tag', '%s', t, label=label)
         fmt = " " * (30 - encoding.colwidth(t)) + ' %5d:%s'
         fm.condwrite(not ui.quiet, 'rev node', fmt,
                      repo.changelog.rev(n), hn, label=label)
         fm.condwrite(ui.verbose and tagtype, 'type', ' %s',
                      tagtype, label=label)
         fm.plain('\n')
     fm.end()
 
 @command('tip',
     [('p', 'patch', None, _('show patch')),
     ('g', 'git', None, _('use git extended diff format')),
     ] + templateopts,
     _('[-p] [-g]'))
 def tip(ui, repo, **opts):
     """show the tip revision (DEPRECATED)
 
     The tip revision (usually just called the tip) is the changeset
     most recently added to the repository (and therefore the most
     recently changed head).
 
     If you have just made a commit, that commit will be the tip. If
     you have just pulled changes from another repository, the tip of
     that repository becomes the current tip. The "tip" tag is special
     and cannot be renamed or assigned to a different changeset.
 
     This command is deprecated, please use :hg:`heads` instead.
 
     Returns 0 on success.
     """
     displayer = cmdutil.show_changeset(ui, repo, opts)
     displayer.show(repo['tip'])
     displayer.close()
 
 @command('unbundle',
     [('u', 'update', None,
      _('update to new branch head if changesets were unbundled'))],
     _('[-u] FILE...'))
 def unbundle(ui, repo, fname1, *fnames, **opts):
     """apply one or more changegroup files
 
     Apply one or more compressed changegroup files generated by the
     bundle command.
 
     Returns 0 on success, 1 if an update has unresolved files.
     """
     fnames = (fname1,) + fnames
 
     lock = repo.lock()
     try:
         for fname in fnames:
             f = hg.openpath(ui, fname)
             gen = exchange.readbundle(ui, f, fname)
             modheads = changegroup.addchangegroup(repo, gen, 'unbundle',
                                                   'bundle:' + fname)
     finally:
         lock.release()
 
     return postincoming(ui, repo, modheads, opts.get('update'), None)
 
 @command('^update|up|checkout|co',
     [('C', 'clean', None, _('discard uncommitted changes (no backup)')),
     ('c', 'check', None,
      _('update across branches if no uncommitted changes')),
     ('d', 'date', '', _('tipmost revision matching date'), _('DATE')),
     ('r', 'rev', '', _('revision'), _('REV'))
      ] + mergetoolopts,
     _('[-c] [-C] [-d DATE] [[-r] REV]'))
 def update(ui, repo, node=None, rev=None, clean=False, date=None, check=False,
            tool=None):
     """update working directory (or switch revisions)
 
     Update the repository's working directory to the specified
     changeset. If no changeset is specified, update to the tip of the
     current named branch and move the current bookmark (see :hg:`help
     bookmarks`).
 
     Update sets the working directory's parent revision to the specified
     changeset (see :hg:`help parents`).
 
     If the changeset is not a descendant or ancestor of the working
     directory's parent, the update is aborted. With the -c/--check
     option, the working directory is checked for uncommitted changes; if
     none are found, the working directory is updated to the specified
     changeset.
 
     .. container:: verbose
 
       The following rules apply when the working directory contains
       uncommitted changes:
 
       1. If neither -c/--check nor -C/--clean is specified, and if
          the requested changeset is an ancestor or descendant of
          the working directory's parent, the uncommitted changes
          are merged into the requested changeset and the merged
          result is left uncommitted. If the requested changeset is
          not an ancestor or descendant (that is, it is on another
          branch), the update is aborted and the uncommitted changes
          are preserved.
 
       2. With the -c/--check option, the update is aborted and the
          uncommitted changes are preserved.
 
       3. With the -C/--clean option, uncommitted changes are discarded and
          the working directory is updated to the requested changeset.
 
     To cancel an uncommitted merge (and lose your changes), use
     :hg:`update --clean .`.
 
     Use null as the changeset to remove the working directory (like
     :hg:`clone -U`).
 
     If you want to revert just one file to an older revision, use
     :hg:`revert [-r REV] NAME`.
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
 
     Returns 0 on success, 1 if there are unresolved files.
     """
     if rev and node:
         raise util.Abort(_("please specify just one revision"))
 
     if rev is None or rev == '':
         rev = node
 
     cmdutil.clearunfinished(repo)
 
     # with no argument, we also move the current bookmark, if any
     rev, movemarkfrom = bookmarks.calculateupdate(ui, repo, rev)
 
     # if we defined a bookmark, we have to remember the original bookmark name
     brev = rev
     rev = scmutil.revsingle(repo, rev, rev).rev()
 
     if check and clean:
         raise util.Abort(_("cannot specify both -c/--check and -C/--clean"))
 
     if date:
         if rev is not None:
             raise util.Abort(_("you can't specify a revision and a date"))
         rev = cmdutil.finddate(ui, repo, date)
 
     if check:
         c = repo[None]
         if c.dirty(merge=False, branch=False, missing=True):
             raise util.Abort(_("uncommitted changes"))
         if rev is None:
             rev = repo[repo[None].branch()].rev()
         mergemod._checkunknown(repo, repo[None], repo[rev])
 
     repo.ui.setconfig('ui', 'forcemerge', tool, 'update')
 
     if clean:
         ret = hg.clean(repo, rev)
     else:
         ret = hg.update(repo, rev)
 
     if not ret and movemarkfrom:
         if bookmarks.update(repo, [movemarkfrom], repo['.'].node()):
             ui.status(_("updating bookmark %s\n") % repo._bookmarkcurrent)
     elif brev in repo._bookmarks:
         bookmarks.setcurrent(repo, brev)
         ui.status(_("(activating bookmark %s)\n") % brev)
     elif brev:
         if repo._bookmarkcurrent:
             ui.status(_("(leaving bookmark %s)\n") %
                       repo._bookmarkcurrent)
         bookmarks.unsetcurrent(repo)
 
     return ret
 
 @command('verify', [])
 def verify(ui, repo):
     """verify the integrity of the repository
 
     Verify the integrity of the current repository.
 
     This will perform an extensive check of the repository's
     integrity, validating the hashes and checksums of each entry in
     the changelog, manifest, and tracked files, as well as the
     integrity of their crosslinks and indices.
 
     Please see http://mercurial.selenic.com/wiki/RepositoryCorruption
     for more information about recovery from corruption of the
     repository.
 
     Returns 0 on success, 1 if errors are encountered.
     """
     return hg.verify(repo)
 
 @command('version', [], norepo=True)
 def version_(ui):
     """output version and copyright information"""
     ui.write(_("Mercurial Distributed SCM (version %s)\n")
              % util.version())
     ui.status(_(
         "(see http://mercurial.selenic.com for more information)\n"
         "\nCopyright (C) 2005-2014 Matt Mackall and others\n"
         "This is free software; see the source for copying conditions. "
         "There is NO\nwarranty; "
         "not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
     ))
 
     ui.note(_("\nEnabled extensions:\n\n"))
     if ui.verbose:
         # format names and versions into columns
         names = []
         vers = []
         for name, module in extensions.extensions():
             names.append(name)
             vers.append(extensions.moduleversion(module))
         if names:
             maxnamelen = max(len(n) for n in names)
             for i, name in enumerate(names):
                 ui.write("  %-*s  %s\n" % (maxnamelen, name, vers[i]))

mercurial/obsolete.py

@@ -1,1166 +1,1167 b''
 # obsolete.py - obsolete markers handling
 #
 # Copyright 2012 Pierre-Yves David <[e-mail]>
 #                Logilab SA        <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 """Obsolete marker handling
 
 An obsolete marker maps an old changeset to a list of new
 changesets. If the list of new changesets is empty, the old changeset
 is said to be "killed". Otherwise, the old changeset is being
 "replaced" by the new changesets.
 
 Obsolete markers can be used to record and distribute changeset graph
 transformations performed by history rewrite operations, and help
 building new tools to reconcile conflicting rewrite actions. To
 facilitate conflict resolution, markers include various annotations
 besides old and news changeset identifiers, such as creation date or
 author name.
 
 The old obsoleted changeset is called a "precursor" and possible
 replacements are called "successors". Markers that used changeset X as
 a precursor are called "successor markers of X" because they hold
 information about the successors of X. Markers that use changeset Y as
 a successors are call "precursor markers of Y" because they hold
 information about the precursors of Y.
 
 Examples:
 
 - When changeset A is replaced by changeset A', one marker is stored:
 
     (A, (A',))
 
 - When changesets A and B are folded into a new changeset C, two markers are
   stored:
 
     (A, (C,)) and (B, (C,))
 
 - When changeset A is simply "pruned" from the graph, a marker is created:
 
     (A, ())
 
 - When changeset A is split into B and C, a single marker are used:
 
     (A, (C, C))
 
   We use a single marker to distinguish the "split" case from the "divergence"
   case. If two independent operations rewrite the same changeset A in to A' and
   A'', we have an error case: divergent rewriting. We can detect it because
   two markers will be created independently:
 
   (A, (B,)) and (A, (C,))
 
 Format
 ------
 
 Markers are stored in an append-only file stored in
 '.hg/store/obsstore'.
 
 The file starts with a version header:
 
 - 1 unsigned byte: version number, starting at zero.
 
 The header is followed by the markers. Marker format depend of the version. See
 comment associated with each format for details.
 
 """
 import struct
 import util, base85, node
 import phases
 from i18n import _
 
 _pack = struct.pack
 _unpack = struct.unpack
 
 _SEEK_END = 2 # os.SEEK_END was introduced in Python 2.5
 
 # the obsolete feature is not mature enough to be enabled by default.
 # you have to rely on third party extension extension to enable this.
 _enabled = False
 
 # Options for obsolescence
 createmarkersopt = 'createmarkers'
+allowunstableopt = 'allowunstable'
 
 ### obsolescence marker flag
 
 ## bumpedfix flag
 #
 # When a changeset A' succeed to a changeset A which became public, we call A'
 # "bumped" because it's a successors of a public changesets
 #
 # o    A' (bumped)
 # |`:
 # | o  A
 # |/
 # o    Z
 #
 # The way to solve this situation is to create a new changeset Ad as children
 # of A. This changeset have the same content than A'. So the diff from A to A'
 # is the same than the diff from A to Ad. Ad is marked as a successors of A'
 #
 # o   Ad
 # |`:
 # | x A'
 # |'|
 # o | A
 # |/
 # o Z
 #
 # But by transitivity Ad is also a successors of A. To avoid having Ad marked
 # as bumped too, we add the `bumpedfix` flag to the marker. <A', (Ad,)>.
 # This flag mean that the successors express the changes between the public and
 # bumped version and fix the situation, breaking the transitivity of
 # "bumped" here.
 bumpedfix = 1
 usingsha256 = 2
 
 ## Parsing and writing of version "0"
 #
 # The header is followed by the markers. Each marker is made of:
 #
 # - 1 uint8 : number of new changesets "N", can be zero.
 #
 # - 1 uint32: metadata size "M" in bytes.
 #
 # - 1 byte: a bit field. It is reserved for flags used in common
 #   obsolete marker operations, to avoid repeated decoding of metadata
 #   entries.
 #
 # - 20 bytes: obsoleted changeset identifier.
 #
 # - N*20 bytes: new changesets identifiers.
 #
 # - M bytes: metadata as a sequence of nul-terminated strings. Each
 #   string contains a key and a value, separated by a colon ':', without
 #   additional encoding. Keys cannot contain '\0' or ':' and values
 #   cannot contain '\0'.
 _fm0version = 0
 _fm0fixed   = '>BIB20s'
 _fm0node = '20s'
 _fm0fsize = struct.calcsize(_fm0fixed)
 _fm0fnodesize = struct.calcsize(_fm0node)
 
 def _fm0readmarkers(data, off=0):
     # Loop on markers
     l = len(data)
     while off + _fm0fsize <= l:
         # read fixed part
         cur = data[off:off + _fm0fsize]
         off += _fm0fsize
         numsuc, mdsize, flags, pre = _unpack(_fm0fixed, cur)
         # read replacement
         sucs = ()
         if numsuc:
             s = (_fm0fnodesize * numsuc)
             cur = data[off:off + s]
             sucs = _unpack(_fm0node * numsuc, cur)
             off += s
         # read metadata
         # (metadata will be decoded on demand)
         metadata = data[off:off + mdsize]
         if len(metadata) != mdsize:
             raise util.Abort(_('parsing obsolete marker: metadata is too '
                                'short, %d bytes expected, got %d')
                              % (mdsize, len(metadata)))
         off += mdsize
         metadata = _fm0decodemeta(metadata)
         try:
             when, offset = metadata.pop('date', '0 0').split(' ')
             date = float(when), int(offset)
         except ValueError:
             date = (0., 0)
         parents = None
         if 'p2' in metadata:
             parents = (metadata.pop('p1', None), metadata.pop('p2', None))
         elif 'p1' in metadata:
             parents = (metadata.pop('p1', None),)
         elif 'p0' in metadata:
             parents = ()
         if parents is not None:
             try:
                 parents = tuple(node.bin(p) for p in parents)
                 # if parent content is not a nodeid, drop the data
                 for p in parents:
                     if len(p) != 20:
                         parents = None
                         break
             except TypeError:
                 # if content cannot be translated to nodeid drop the data.
                 parents = None
 
         metadata = tuple(sorted(metadata.iteritems()))
 
         yield (pre, sucs, flags, metadata, date, parents)
 
 def _fm0encodeonemarker(marker):
     pre, sucs, flags, metadata, date, parents = marker
     if flags & usingsha256:
         raise util.Abort(_('cannot handle sha256 with old obsstore format'))
     metadata = dict(metadata)
     metadata['date'] = '%d %i' % date
     if parents is not None:
         if not parents:
             # mark that we explicitly recorded no parents
             metadata['p0'] = ''
         for i, p in enumerate(parents):
             metadata['p%i' % (i + 1)] = node.hex(p)
     metadata = _fm0encodemeta(metadata)
     numsuc = len(sucs)
     format = _fm0fixed + (_fm0node * numsuc)
     data = [numsuc, len(metadata), flags, pre]
     data.extend(sucs)
     return _pack(format, *data) + metadata
 
 def _fm0encodemeta(meta):
     """Return encoded metadata string to string mapping.
 
     Assume no ':' in key and no '\0' in both key and value."""
     for key, value in meta.iteritems():
         if ':' in key or '\0' in key:
             raise ValueError("':' and '\0' are forbidden in metadata key'")
         if '\0' in value:
             raise ValueError("':' is forbidden in metadata value'")
     return '\0'.join(['%s:%s' % (k, meta[k]) for k in sorted(meta)])
 
 def _fm0decodemeta(data):
     """Return string to string dictionary from encoded version."""
     d = {}
     for l in data.split('\0'):
         if l:
             key, value = l.split(':')
             d[key] = value
     return d
 
 ## Parsing and writing of version "1"
 #
 # The header is followed by the markers. Each marker is made of:
 #
 # - uint32: total size of the marker (including this field)
 #
 # - float64: date in seconds since epoch
 #
 # - int16: timezone offset in minutes
 #
 # - uint16: a bit field. It is reserved for flags used in common
 #   obsolete marker operations, to avoid repeated decoding of metadata
 #   entries.
 #
 # - uint8: number of successors "N", can be zero.
 #
 # - uint8: number of parents "P", can be zero.
 #
 #     0: parents data stored but no parent,
 #     1: one parent stored,
 #     2: two parents stored,
 #     3: no parent data stored
 #
 # - uint8: number of metadata entries M
 #
 # - 20 or 32 bytes: precursor changeset identifier.
 #
 # - N*(20 or 32) bytes: successors changesets identifiers.
 #
 # - P*(20 or 32) bytes: parents of the precursors changesets.
 #
 # - M*(uint8, uint8): size of all metadata entries (key and value)
 #
 # - remaining bytes: the metadata, each (key, value) pair after the other.
 _fm1version = 1
 _fm1fixed = '>IdhHBBB20s'
 _fm1nodesha1 = '20s'
 _fm1nodesha256 = '32s'
 _fm1fsize = struct.calcsize(_fm1fixed)
 _fm1parentnone = 3
 _fm1parentshift = 14
 _fm1parentmask = (_fm1parentnone << _fm1parentshift)
 _fm1metapair = 'BB'
 _fm1metapairsize = struct.calcsize('BB')
 
 def _fm1readmarkers(data, off=0):
     # Loop on markers
     l = len(data)
     while off + _fm1fsize <= l:
         # read fixed part
         cur = data[off:off + _fm1fsize]
         off += _fm1fsize
         fixeddata = _unpack(_fm1fixed, cur)
         ttsize, seconds, tz, flags, numsuc, numpar, nummeta, prec = fixeddata
         # extract the number of parents information
         if numpar == _fm1parentnone:
             numpar = None
         # build the date tuple (upgrade tz minutes to seconds)
         date = (seconds, tz * 60)
         _fm1node = _fm1nodesha1
         if flags & usingsha256:
             _fm1node = _fm1nodesha256
         fnodesize = struct.calcsize(_fm1node)
         # read replacement
         sucs = ()
         if numsuc:
             s = (fnodesize * numsuc)
             cur = data[off:off + s]
             sucs = _unpack(_fm1node * numsuc, cur)
             off += s
         # read parents
         if numpar is None:
             parents = None
         elif numpar == 0:
             parents = ()
         elif numpar:  # neither None nor zero
             s = (fnodesize * numpar)
             cur = data[off:off + s]
             parents = _unpack(_fm1node * numpar, cur)
             off += s
         # read metadata
         metaformat = '>' + (_fm1metapair * nummeta)
         s = _fm1metapairsize * nummeta
         metapairsize = _unpack(metaformat, data[off:off + s])
         off += s
         metadata = []
         for idx in xrange(0, len(metapairsize), 2):
             sk = metapairsize[idx]
             sv = metapairsize[idx + 1]
             key = data[off:off + sk]
             value = data[off + sk:off + sk + sv]
             assert len(key) == sk
             assert len(value) == sv
             metadata.append((key, value))
             off += sk + sv
         metadata = tuple(metadata)
 
         yield (prec, sucs, flags, metadata, date, parents)
 
 def _fm1encodeonemarker(marker):
     pre, sucs, flags, metadata, date, parents = marker
     # determine node size
     _fm1node = _fm1nodesha1
     if flags & usingsha256:
         _fm1node = _fm1nodesha256
     numsuc = len(sucs)
     numextranodes = numsuc
     if parents is None:
         numpar = _fm1parentnone
     else:
         numpar = len(parents)
         numextranodes += numpar
     formatnodes = _fm1node * numextranodes
     formatmeta = _fm1metapair * len(metadata)
     format = _fm1fixed + formatnodes + formatmeta
     # tz is stored in minutes so we divide by 60
     tz = date[1]//60
     data = [None, date[0], tz, flags, numsuc, numpar, len(metadata), pre]
     data.extend(sucs)
     if parents is not None:
         data.extend(parents)
     totalsize = struct.calcsize(format)
     for key, value in metadata:
         lk = len(key)
         lv = len(value)
         data.append(lk)
         data.append(lv)
         totalsize += lk + lv
     data[0] = totalsize
     data = [_pack(format, *data)]
     for key, value in metadata:
         data.append(key)
         data.append(value)
     return ''.join(data)
 
 # mapping to read/write various marker formats
 # <version> -> (decoder, encoder)
 formats = {_fm0version: (_fm0readmarkers, _fm0encodeonemarker),
            _fm1version: (_fm1readmarkers, _fm1encodeonemarker)}
 
 def _readmarkers(data):
     """Read and enumerate markers from raw data"""
     off = 0
     diskversion = _unpack('>B', data[off:off + 1])[0]
     off += 1
     if diskversion not in formats:
         raise util.Abort(_('parsing obsolete marker: unknown version %r')
                          % diskversion)
     return diskversion, formats[diskversion][0](data, off)
 
 def encodemarkers(markers, addheader=False, version=_fm0version):
     # Kept separate from flushmarkers(), it will be reused for
     # markers exchange.
     encodeone = formats[version][1]
     if addheader:
         yield _pack('>B', version)
     for marker in markers:
         yield encodeone(marker)
 
 
 class marker(object):
     """Wrap obsolete marker raw data"""
 
     def __init__(self, repo, data):
         # the repo argument will be used to create changectx in later version
         self._repo = repo
         self._data = data
         self._decodedmeta = None
 
     def __hash__(self):
         return hash(self._data)
 
     def __eq__(self, other):
         if type(other) != type(self):
             return False
         return self._data == other._data
 
     def precnode(self):
         """Precursor changeset node identifier"""
         return self._data[0]
 
     def succnodes(self):
         """List of successor changesets node identifiers"""
         return self._data[1]
 
     def parentnodes(self):
         """Parents of the precursors (None if not recorded)"""
         return self._data[5]
 
     def metadata(self):
         """Decoded metadata dictionary"""
         return dict(self._data[3])
 
     def date(self):
         """Creation date as (unixtime, offset)"""
         return self._data[4]
 
     def flags(self):
         """The flags field of the marker"""
         return self._data[2]
 
 class obsstore(object):
     """Store obsolete markers
 
     Markers can be accessed with two mappings:
     - precursors[x] -> set(markers on precursors edges of x)
     - successors[x] -> set(markers on successors edges of x)
     - children[x]   -> set(markers on precursors edges of children(x)
     """
 
     fields = ('prec', 'succs', 'flag', 'meta', 'date', 'parents')
     # prec:    nodeid, precursor changesets
     # succs:   tuple of nodeid, successor changesets (0-N length)
     # flag:    integer, flag field carrying modifier for the markers (see doc)
     # meta:    binary blob, encoded metadata dictionary
     # date:    (float, int) tuple, date of marker creation
     # parents: (tuple of nodeid) or None, parents of precursors
     #          None is used when no data has been recorded
 
     def __init__(self, sopener, defaultformat=_fm1version, readonly=False):
         # caches for various obsolescence related cache
         self.caches = {}
         self._all = []
         self.precursors = {}
         self.successors = {}
         self.children = {}
         self.sopener = sopener
         data = sopener.tryread('obsstore')
         self._version = defaultformat
         self._readonly = readonly
         if data:
             self._version, markers = _readmarkers(data)
             self._load(markers)
 
     def __iter__(self):
         return iter(self._all)
 
     def __len__(self):
         return len(self._all)
 
     def __nonzero__(self):
         return bool(self._all)
 
     def create(self, transaction, prec, succs=(), flag=0, parents=None,
                date=None, metadata=None):
         """obsolete: add a new obsolete marker
 
         * ensuring it is hashable
         * check mandatory metadata
         * encode metadata
 
         If you are a human writing code creating marker you want to use the
         `createmarkers` function in this module instead.
 
         return True if a new marker have been added, False if the markers
         already existed (no op).
         """
         if metadata is None:
             metadata = {}
         if date is None:
             if 'date' in metadata:
                 # as a courtesy for out-of-tree extensions
                 date = util.parsedate(metadata.pop('date'))
             else:
                 date = util.makedate()
         if len(prec) != 20:
             raise ValueError(prec)
         for succ in succs:
             if len(succ) != 20:
                 raise ValueError(succ)
         if prec in succs:
             raise ValueError(_('in-marker cycle with %s') % node.hex(prec))
 
         metadata = tuple(sorted(metadata.iteritems()))
 
         marker = (str(prec), tuple(succs), int(flag), metadata, date, parents)
         return bool(self.add(transaction, [marker]))
 
     def add(self, transaction, markers):
         """Add new markers to the store
 
         Take care of filtering duplicate.
         Return the number of new marker."""
         if self._readonly:
             raise util.Abort('creating obsolete markers is not enabled on this '
                              'repo')
         known = set(self._all)
         new = []
         for m in markers:
             if m not in known:
                 known.add(m)
                 new.append(m)
         if new:
             f = self.sopener('obsstore', 'ab')
             try:
                 # Whether the file's current position is at the begin or at
                 # the end after opening a file for appending is implementation
                 # defined. So we must seek to the end before calling tell(),
                 # or we may get a zero offset for non-zero sized files on
                 # some platforms (issue3543).
                 f.seek(0, _SEEK_END)
                 offset = f.tell()
                 transaction.add('obsstore', offset)
                 # offset == 0: new file - add the version header
                 for bytes in encodemarkers(new, offset == 0, self._version):
                     f.write(bytes)
             finally:
                 # XXX: f.close() == filecache invalidation == obsstore rebuilt.
                 # call 'filecacheentry.refresh()'  here
                 f.close()
             self._load(new)
             # new marker *may* have changed several set. invalidate the cache.
             self.caches.clear()
         # records the number of new markers for the transaction hooks
         previous = int(transaction.hookargs.get('new_obsmarkers', '0'))
         transaction.hookargs['new_obsmarkers'] = str(previous + len(new))
         return len(new)
 
     def mergemarkers(self, transaction, data):
         """merge a binary stream of markers inside the obsstore
 
         Returns the number of new markers added."""
         version, markers = _readmarkers(data)
         return self.add(transaction, markers)
 
     def _load(self, markers):
         for mark in markers:
             self._all.append(mark)
             pre, sucs = mark[:2]
             self.successors.setdefault(pre, set()).add(mark)
             for suc in sucs:
                 self.precursors.setdefault(suc, set()).add(mark)
             parents = mark[5]
             if parents is not None:
                 for p in parents:
                     self.children.setdefault(p, set()).add(mark)
         if node.nullid in self.precursors:
             raise util.Abort(_('bad obsolescence marker detected: '
                                'invalid successors nullid'))
     def relevantmarkers(self, nodes):
         """return a set of all obsolescence markers relevant to a set of nodes.
 
         "relevant" to a set of nodes mean:
 
         - marker that use this changeset as successor
         - prune marker of direct children on this changeset
         - recursive application of the two rules on precursors of these markers
 
         It is a set so you cannot rely on order."""
 
         pendingnodes = set(nodes)
         seenmarkers = set()
         seennodes = set(pendingnodes)
         precursorsmarkers = self.precursors
         children = self.children
         while pendingnodes:
             direct = set()
             for current in pendingnodes:
                 direct.update(precursorsmarkers.get(current, ()))
                 pruned = [m for m in children.get(current, ()) if not m[1]]
                 direct.update(pruned)
             direct -= seenmarkers
             pendingnodes = set([m[0] for m in direct])
             seenmarkers |= direct
             pendingnodes -= seennodes
             seennodes |= pendingnodes
         return seenmarkers
 
 def commonversion(versions):
     """Return the newest version listed in both versions and our local formats.
 
     Returns None if no common version exists.
     """
     versions.sort(reverse=True)
     # search for highest version known on both side
     for v in versions:
         if v in formats:
             return v
     return None
 
 # arbitrary picked to fit into 8K limit from HTTP server
 # you have to take in account:
 # - the version header
 # - the base85 encoding
 _maxpayload = 5300
 
 def _pushkeyescape(markers):
     """encode markers into a dict suitable for pushkey exchange
 
     - binary data is base85 encoded
     - split in chunks smaller than 5300 bytes"""
     keys = {}
     parts = []
     currentlen = _maxpayload * 2  # ensure we create a new part
     for marker in markers:
         nextdata = _fm0encodeonemarker(marker)
         if (len(nextdata) + currentlen > _maxpayload):
             currentpart = []
             currentlen = 0
             parts.append(currentpart)
         currentpart.append(nextdata)
         currentlen += len(nextdata)
     for idx, part in enumerate(reversed(parts)):
         data = ''.join([_pack('>B', _fm0version)] + part)
         keys['dump%i' % idx] = base85.b85encode(data)
     return keys
 
 def listmarkers(repo):
     """List markers over pushkey"""
     if not repo.obsstore:
         return {}
     return _pushkeyescape(repo.obsstore)
 
 def pushmarker(repo, key, old, new):
     """Push markers over pushkey"""
     if not key.startswith('dump'):
         repo.ui.warn(_('unknown key: %r') % key)
         return 0
     if old:
         repo.ui.warn(_('unexpected old value for %r') % key)
         return 0
     data = base85.b85decode(new)
     lock = repo.lock()
     try:
         tr = repo.transaction('pushkey: obsolete markers')
         try:
             repo.obsstore.mergemarkers(tr, data)
             tr.close()
             return 1
         finally:
             tr.release()
     finally:
         lock.release()
 
 def getmarkers(repo, nodes=None):
     """returns markers known in a repository
 
     If <nodes> is specified, only markers "relevant" to those nodes are are
     returned"""
     if nodes is None:
         rawmarkers = repo.obsstore
     else:
         rawmarkers = repo.obsstore.relevantmarkers(nodes)
 
     for markerdata in rawmarkers:
         yield marker(repo, markerdata)
 
 def relevantmarkers(repo, node):
     """all obsolete markers relevant to some revision"""
     for markerdata in repo.obsstore.relevantmarkers(node):
         yield marker(repo, markerdata)
 
 
 def precursormarkers(ctx):
     """obsolete marker marking this changeset as a successors"""
     for data in ctx._repo.obsstore.precursors.get(ctx.node(), ()):
         yield marker(ctx._repo, data)
 
 def successormarkers(ctx):
     """obsolete marker making this changeset obsolete"""
     for data in ctx._repo.obsstore.successors.get(ctx.node(), ()):
         yield marker(ctx._repo, data)
 
 def allsuccessors(obsstore, nodes, ignoreflags=0):
     """Yield node for every successor of <nodes>.
 
     Some successors may be unknown locally.
 
     This is a linear yield unsuited to detecting split changesets. It includes
     initial nodes too."""
     remaining = set(nodes)
     seen = set(remaining)
     while remaining:
         current = remaining.pop()
         yield current
         for mark in obsstore.successors.get(current, ()):
             # ignore marker flagged with specified flag
             if mark[2] & ignoreflags:
                 continue
             for suc in mark[1]:
                 if suc not in seen:
                     seen.add(suc)
                     remaining.add(suc)
 
 def allprecursors(obsstore, nodes, ignoreflags=0):
     """Yield node for every precursors of <nodes>.
 
     Some precursors may be unknown locally.
 
     This is a linear yield unsuited to detecting folded changesets. It includes
     initial nodes too."""
 
     remaining = set(nodes)
     seen = set(remaining)
     while remaining:
         current = remaining.pop()
         yield current
         for mark in obsstore.precursors.get(current, ()):
             # ignore marker flagged with specified flag
             if mark[2] & ignoreflags:
                 continue
             suc = mark[0]
             if suc not in seen:
                 seen.add(suc)
                 remaining.add(suc)
 
 def foreground(repo, nodes):
     """return all nodes in the "foreground" of other node
 
     The foreground of a revision is anything reachable using parent -> children
     or precursor -> successor relation. It is very similar to "descendant" but
     augmented with obsolescence information.
 
     Beware that possible obsolescence cycle may result if complex situation.
     """
     repo = repo.unfiltered()
     foreground = set(repo.set('%ln::', nodes))
     if repo.obsstore:
         # We only need this complicated logic if there is obsolescence
         # XXX will probably deserve an optimised revset.
         nm = repo.changelog.nodemap
         plen = -1
         # compute the whole set of successors or descendants
         while len(foreground) != plen:
             plen = len(foreground)
             succs = set(c.node() for c in foreground)
             mutable = [c.node() for c in foreground if c.mutable()]
             succs.update(allsuccessors(repo.obsstore, mutable))
             known = (n for n in succs if n in nm)
             foreground = set(repo.set('%ln::', known))
     return set(c.node() for c in foreground)
 
 
 def successorssets(repo, initialnode, cache=None):
     """Return all set of successors of initial nodes
 
     The successors set of a changeset A are a group of revisions that succeed
     A. It succeeds A as a consistent whole, each revision being only a partial
     replacement. The successors set contains non-obsolete changesets only.
 
     This function returns the full list of successor sets which is why it
     returns a list of tuples and not just a single tuple. Each tuple is a valid
     successors set. Not that (A,) may be a valid successors set for changeset A
     (see below).
 
     In most cases, a changeset A will have a single element (e.g. the changeset
     A is replaced by A') in its successors set. Though, it is also common for a
     changeset A to have no elements in its successor set (e.g. the changeset
     has been pruned). Therefore, the returned list of successors sets will be
     [(A',)] or [], respectively.
 
     When a changeset A is split into A' and B', however, it will result in a
     successors set containing more than a single element, i.e. [(A',B')].
     Divergent changesets will result in multiple successors sets, i.e. [(A',),
     (A'')].
 
     If a changeset A is not obsolete, then it will conceptually have no
     successors set. To distinguish this from a pruned changeset, the successor
     set will only contain itself, i.e. [(A,)].
 
     Finally, successors unknown locally are considered to be pruned (obsoleted
     without any successors).
 
     The optional `cache` parameter is a dictionary that may contain precomputed
     successors sets. It is meant to reuse the computation of a previous call to
     `successorssets` when multiple calls are made at the same time. The cache
     dictionary is updated in place. The caller is responsible for its live
     spawn. Code that makes multiple calls to `successorssets` *must* use this
     cache mechanism or suffer terrible performances.
 
     """
 
     succmarkers = repo.obsstore.successors
 
     # Stack of nodes we search successors sets for
     toproceed = [initialnode]
     # set version of above list for fast loop detection
     # element added to "toproceed" must be added here
     stackedset = set(toproceed)
     if cache is None:
         cache = {}
 
     # This while loop is the flattened version of a recursive search for
     # successors sets
     #
     # def successorssets(x):
     #    successors = directsuccessors(x)
     #    ss = [[]]
     #    for succ in directsuccessors(x):
     #        # product as in itertools cartesian product
     #        ss = product(ss, successorssets(succ))
     #    return ss
     #
     # But we can not use plain recursive calls here:
     # - that would blow the python call stack
     # - obsolescence markers may have cycles, we need to handle them.
     #
     # The `toproceed` list act as our call stack. Every node we search
     # successors set for are stacked there.
     #
     # The `stackedset` is set version of this stack used to check if a node is
     # already stacked. This check is used to detect cycles and prevent infinite
     # loop.
     #
     # successors set of all nodes are stored in the `cache` dictionary.
     #
     # After this while loop ends we use the cache to return the successors sets
     # for the node requested by the caller.
     while toproceed:
         # Every iteration tries to compute the successors sets of the topmost
         # node of the stack: CURRENT.
         #
         # There are four possible outcomes:
         #
         # 1) We already know the successors sets of CURRENT:
         #    -> mission accomplished, pop it from the stack.
         # 2) Node is not obsolete:
         #    -> the node is its own successors sets. Add it to the cache.
         # 3) We do not know successors set of direct successors of CURRENT:
         #    -> We add those successors to the stack.
         # 4) We know successors sets of all direct successors of CURRENT:
         #    -> We can compute CURRENT successors set and add it to the
         #       cache.
         #
         current = toproceed[-1]
         if current in cache:
             # case (1): We already know the successors sets
             stackedset.remove(toproceed.pop())
         elif current not in succmarkers:
             # case (2): The node is not obsolete.
             if current in repo:
                 # We have a valid last successors.
                 cache[current] = [(current,)]
             else:
                 # Final obsolete version is unknown locally.
                 # Do not count that as a valid successors
                 cache[current] = []
         else:
             # cases (3) and (4)
             #
             # We proceed in two phases. Phase 1 aims to distinguish case (3)
             # from case (4):
             #
             #     For each direct successors of CURRENT, we check whether its
             #     successors sets are known. If they are not, we stack the
             #     unknown node and proceed to the next iteration of the while
             #     loop. (case 3)
             #
             #     During this step, we may detect obsolescence cycles: a node
             #     with unknown successors sets but already in the call stack.
             #     In such a situation, we arbitrary set the successors sets of
             #     the node to nothing (node pruned) to break the cycle.
             #
             #     If no break was encountered we proceed to phase 2.
             #
             # Phase 2 computes successors sets of CURRENT (case 4); see details
             # in phase 2 itself.
             #
             # Note the two levels of iteration in each phase.
             # - The first one handles obsolescence markers using CURRENT as
             #   precursor (successors markers of CURRENT).
             #
             #   Having multiple entry here means divergence.
             #
             # - The second one handles successors defined in each marker.
             #
             #   Having none means pruned node, multiple successors means split,
             #   single successors are standard replacement.
             #
             for mark in sorted(succmarkers[current]):
                 for suc in mark[1]:
                     if suc not in cache:
                         if suc in stackedset:
                             # cycle breaking
                             cache[suc] = []
                         else:
                             # case (3) If we have not computed successors sets
                             # of one of those successors we add it to the
                             # `toproceed` stack and stop all work for this
                             # iteration.
                             toproceed.append(suc)
                             stackedset.add(suc)
                             break
                 else:
                     continue
                 break
             else:
                 # case (4): we know all successors sets of all direct
                 # successors
                 #
                 # Successors set contributed by each marker depends on the
                 # successors sets of all its "successors" node.
                 #
                 # Each different marker is a divergence in the obsolescence
                 # history. It contributes successors sets distinct from other
                 # markers.
                 #
                 # Within a marker, a successor may have divergent successors
                 # sets. In such a case, the marker will contribute multiple
                 # divergent successors sets. If multiple successors have
                 # divergent successors sets, a Cartesian product is used.
                 #
                 # At the end we post-process successors sets to remove
                 # duplicated entry and successors set that are strict subset of
                 # another one.
                 succssets = []
                 for mark in sorted(succmarkers[current]):
                     # successors sets contributed by this marker
                     markss = [[]]
                     for suc in mark[1]:
                         # cardinal product with previous successors
                         productresult = []
                         for prefix in markss:
                             for suffix in cache[suc]:
                                 newss = list(prefix)
                                 for part in suffix:
                                     # do not duplicated entry in successors set
                                     # first entry wins.
                                     if part not in newss:
                                         newss.append(part)
                                 productresult.append(newss)
                         markss = productresult
                     succssets.extend(markss)
                 # remove duplicated and subset
                 seen = []
                 final = []
                 candidate = sorted(((set(s), s) for s in succssets if s),
                                    key=lambda x: len(x[1]), reverse=True)
                 for setversion, listversion in candidate:
                     for seenset in seen:
                         if setversion.issubset(seenset):
                             break
                     else:
                         final.append(listversion)
                         seen.append(setversion)
                 final.reverse() # put small successors set first
                 cache[current] = final
     return cache[initialnode]
 
 def _knownrevs(repo, nodes):
     """yield revision numbers of known nodes passed in parameters
 
     Unknown revisions are silently ignored."""
     torev = repo.changelog.nodemap.get
     for n in nodes:
         rev = torev(n)
         if rev is not None:
             yield rev
 
 # mapping of 'set-name' -> <function to compute this set>
 cachefuncs = {}
 def cachefor(name):
     """Decorator to register a function as computing the cache for a set"""
     def decorator(func):
         assert name not in cachefuncs
         cachefuncs[name] = func
         return func
     return decorator
 
 def getrevs(repo, name):
     """Return the set of revision that belong to the <name> set
 
     Such access may compute the set and cache it for future use"""
     repo = repo.unfiltered()
     if not repo.obsstore:
         return frozenset()
     if name not in repo.obsstore.caches:
         repo.obsstore.caches[name] = cachefuncs[name](repo)
     return repo.obsstore.caches[name]
 
 # To be simple we need to invalidate obsolescence cache when:
 #
 # - new changeset is added:
 # - public phase is changed
 # - obsolescence marker are added
 # - strip is used a repo
 def clearobscaches(repo):
     """Remove all obsolescence related cache from a repo
 
     This remove all cache in obsstore is the obsstore already exist on the
     repo.
 
     (We could be smarter here given the exact event that trigger the cache
     clearing)"""
     # only clear cache is there is obsstore data in this repo
     if 'obsstore' in repo._filecache:
         repo.obsstore.caches.clear()
 
 @cachefor('obsolete')
 def _computeobsoleteset(repo):
     """the set of obsolete revisions"""
     obs = set()
     getrev = repo.changelog.nodemap.get
     getphase = repo._phasecache.phase
     for n in repo.obsstore.successors:
         rev = getrev(n)
         if rev is not None and getphase(repo, rev):
             obs.add(rev)
     return obs
 
 @cachefor('unstable')
 def _computeunstableset(repo):
     """the set of non obsolete revisions with obsolete parents"""
     # revset is not efficient enough here
     # we do (obsolete()::) - obsolete() by hand
     obs = getrevs(repo, 'obsolete')
     if not obs:
         return set()
     cl = repo.changelog
     return set(r for r in cl.descendants(obs) if r not in obs)
 
 @cachefor('suspended')
 def _computesuspendedset(repo):
     """the set of obsolete parents with non obsolete descendants"""
     suspended = repo.changelog.ancestors(getrevs(repo, 'unstable'))
     return set(r for r in getrevs(repo, 'obsolete') if r in suspended)
 
 @cachefor('extinct')
 def _computeextinctset(repo):
     """the set of obsolete parents without non obsolete descendants"""
     return getrevs(repo, 'obsolete') - getrevs(repo, 'suspended')
 
 
 @cachefor('bumped')
 def _computebumpedset(repo):
     """the set of revs trying to obsolete public revisions"""
     bumped = set()
     # util function (avoid attribute lookup in the loop)
     phase = repo._phasecache.phase # would be faster to grab the full list
     public = phases.public
     cl = repo.changelog
     torev = cl.nodemap.get
     obs = getrevs(repo, 'obsolete')
     for rev in repo:
         # We only evaluate mutable, non-obsolete revision
         if (public < phase(repo, rev)) and (rev not in obs):
             node = cl.node(rev)
             # (future) A cache of precursors may worth if split is very common
             for pnode in allprecursors(repo.obsstore, [node],
                                        ignoreflags=bumpedfix):
                 prev = torev(pnode) # unfiltered! but so is phasecache
                 if (prev is not None) and (phase(repo, prev) <= public):
                     # we have a public precursors
                     bumped.add(rev)
                     break # Next draft!
     return bumped
 
 @cachefor('divergent')
 def _computedivergentset(repo):
     """the set of rev that compete to be the final successors of some revision.
     """
     divergent = set()
     obsstore = repo.obsstore
     newermap = {}
     for ctx in repo.set('(not public()) - obsolete()'):
         mark = obsstore.precursors.get(ctx.node(), ())
         toprocess = set(mark)
         while toprocess:
             prec = toprocess.pop()[0]
             if prec not in newermap:
                 successorssets(repo, prec, newermap)
             newer = [n for n in newermap[prec] if n]
             if len(newer) > 1:
                 divergent.add(ctx.rev())
                 break
             toprocess.update(obsstore.precursors.get(prec, ()))
     return divergent
 
 
 def createmarkers(repo, relations, flag=0, date=None, metadata=None):
     """Add obsolete markers between changesets in a repo
 
     <relations> must be an iterable of (<old>, (<new>, ...)[,{metadata}])
     tuple. `old` and `news` are changectx. metadata is an optional dictionary
     containing metadata for this marker only. It is merged with the global
     metadata specified through the `metadata` argument of this function,
 
     Trying to obsolete a public changeset will raise an exception.
 
     Current user and date are used except if specified otherwise in the
     metadata attribute.
 
     This function operates within a transaction of its own, but does
     not take any lock on the repo.
     """
     # prepare metadata
     if metadata is None:
         metadata = {}
     if 'user' not in metadata:
         metadata['user'] = repo.ui.username()
     tr = repo.transaction('add-obsolescence-marker')
     try:
         for rel in relations:
             prec = rel[0]
             sucs = rel[1]
             localmetadata = metadata.copy()
             if 2 < len(rel):
                 localmetadata.update(rel[2])
 
             if not prec.mutable():
                 raise util.Abort("cannot obsolete immutable changeset: %s"
                                  % prec)
             nprec = prec.node()
             nsucs = tuple(s.node() for s in sucs)
             npare = None
             if not nsucs:
                 npare = tuple(p.node() for p in prec.parents())
             if nprec in nsucs:
                 raise util.Abort("changeset %s cannot obsolete itself" % prec)
             repo.obsstore.create(tr, nprec, nsucs, flag, parents=npare,
                                  date=date, metadata=localmetadata)
             repo.filteredrevcache.clear()
         tr.close()
     finally:
         tr.release()
 
 def isenabled(repo, option):
     """Returns True if the given repository has the given obsolete option
     enabled.
     """
     result = set(repo.ui.configlist('experimental', 'evolution'))
     if 'all' in result:
         return True
 
     # For migration purposes, temporarily return true if the config hasn't been
     # set but _enabled is true.
     if len(result) == 0 and _enabled:
         return True
 
     return option in result