bookmarks: do not overwrite bookmarks.current if not necessary

If we update to the ref that the bookmarks.current points to, we do
not want to update bookmarks.current

hgext/bookmarks.py

@@ -1,345 +1,351 b''
 # Mercurial extension to provide the 'hg bookmark' command
 #
 # Copyright 2008 David Soria Parra <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
 '''mercurial bookmarks
 
 Mercurial bookmarks are local moveable pointers to changesets. Every
 bookmark points to a changeset identified by its hash. If you commit a
 changeset that is based on a changeset that has a bookmark on it, the
 bookmark is forwarded to the new changeset.
 
 It is possible to use bookmark names in every revision lookup (e.g. hg
 merge, hg update).
 
 The bookmark extension offers the possiblity to have a more git-like experience
 by adding the following configuration option to your .hgrc:
 
 [bookmarks]
 track.current = True
 
 This will cause bookmarks to track the bookmark that you are currently on, and
 just updates it. This is similar to git's approach of branching.
 '''
 
 from mercurial.commands import templateopts, hex, short
 from mercurial import extensions
 from mercurial.i18n import _
 from mercurial import cmdutil, util, commands, changelog
 from mercurial.node import nullid, nullrev
 from mercurial.repo import RepoError
 import mercurial, mercurial.localrepo, mercurial.repair, os
 
 def parse(repo):
     '''Parse .hg/bookmarks file and return a dictionary
 
     Bookmarks are stored as {HASH}\s{NAME}\n (localtags format) values
     in the .hg/bookmarks file. They are read by the parse() method and
     returned as a dictionary with name => hash values.
 
     The parsed dictionary is cached until a write() operation is done.
     '''
     try:
         if repo._bookmarks:
             return repo._bookmarks
         repo._bookmarks = {}
         for line in repo.opener('bookmarks'):
             sha, refspec = line.strip().split(' ', 1)
             repo._bookmarks[refspec] = repo.lookup(sha)
     except:
         pass
     return repo._bookmarks
 
 def write(repo, refs):
     '''Write bookmarks
 
     Write the given bookmark => hash dictionary to the .hg/bookmarks file
     in a format equal to those of localtags.
 
     We also store a backup of the previous state in undo.bookmarks that
     can be copied back on rollback.
     '''
     if os.path.exists(repo.join('bookmarks')):
         util.copyfile(repo.join('bookmarks'), repo.join('undo.bookmarks'))
     file = repo.opener('bookmarks', 'w+')
     if current(repo) not in refs:
         setcurrent(repo, None)
     for refspec, node in refs.items():
         file.write("%s %s\n" % (hex(node), refspec))
     file.close()
 
 def current(repo):
     '''Get the current bookmark
 
     If we use gittishsh branches we have a current bookmark that
     we are on. This function returns the name of the bookmark. It
     is stored in .hg/bookmarks.current
     '''
     if repo._bookmarkcurrent:
         return repo._bookmarkcurrent
     mark = None
     if os.path.exists(repo.join('bookmarks.current')):
         file = repo.opener('bookmarks.current')
         mark = file.readline()
         if mark == '':
             mark = None
         file.close()
     repo._bookmarkcurrent = mark
     return mark
 
 def setcurrent(repo, mark):
     '''Set the name of the bookmark that we are currently on
 
     Set the name of the bookmark that we are on (hg update <bookmark>).
     The name is recoreded in .hg/bookmarks.current
     '''
-    if repo._bookmarkcurrent == mark:
+    if current(repo) == mark:
         return
+
     refs = parse(repo)
+
+    'do not update if we do update to an rev equal to the current bookmark'
+    if (mark not in refs and
+        current(repo) and refs[current(repo)] == repo.changectx('.').node()):
+        return
     if mark not in refs:
         mark = ''
     file = repo.opener('bookmarks.current', 'w+')
     file.write(mark)
     file.close()
     repo._bookmarkcurrent = mark
 
 def bookmark(ui, repo, mark=None, rev=None, force=False, delete=False, rename=None):
     '''mercurial bookmarks
 
     Bookmarks are pointers to certain commits that move when
     commiting. Bookmarks are local. They can be renamed, copied and
     deleted. It is possible to use bookmark names in 'hg merge' and 'hg
     update' to update to a given bookmark.
 
     You can use 'hg bookmark NAME' to set a bookmark on the current
     tip with the given name. If you specify a revision using -r REV
     (where REV may be an existing bookmark), the bookmark is set to
     that revision.
     '''
     hexfn = ui.debugflag and hex or short
     marks = parse(repo)
     cur   = repo.changectx('.').node()
 
     if rename:
         if rename not in marks:
             raise util.Abort(_("a bookmark of this name does not exist"))
         if mark in marks and not force:
             raise util.Abort(_("a bookmark of the same name already exists"))
         if mark is None:
             raise util.Abort(_("new bookmark name required"))
         marks[mark] = marks[rename]
         del marks[rename]
         write(repo, marks)
         return
 
     if delete:
         if mark == None:
             raise util.Abort(_("bookmark name required"))
         if mark not in marks:
             raise util.Abort(_("a bookmark of this name does not exist"))
         del marks[mark]
         write(repo, marks)
         return
 
     if mark != None:
         if "\n" in mark:
             raise util.Abort(_("bookmark name cannot contain newlines"))
         mark = mark.strip()
         if mark in marks and not force:
             raise util.Abort(_("a bookmark of the same name already exists"))
         if ((mark in repo.branchtags() or mark == repo.dirstate.branch())
             and not force):
             raise util.Abort(
                 _("a bookmark cannot have the name of an existing branch"))
         if rev:
             marks[mark] = repo.lookup(rev)
         else:
             marks[mark] = repo.changectx('.').node()
         write(repo, marks)
         return
 
     if mark == None:
         if rev:
             raise util.Abort(_("bookmark name required"))
         if len(marks) == 0:
             ui.status("no bookmarks set\n")
         else:
             for bmark, n in marks.iteritems():
                 if ui.configbool('bookmarks', 'track.current'):
                     prefix = (bmark == current(repo) and n == cur) and '*' or ' '
                 else:
                     prefix = (n == cur) and '*' or ' '
 
                 ui.write(" %s %-25s %d:%s\n" % (
                     prefix, bmark, repo.changelog.rev(n), hexfn(n)))
         return
 
 def _revstostrip(changelog, node):
     srev = changelog.rev(node)
     tostrip = [srev]
     saveheads = []
     for r in xrange(srev, len(changelog)):
         parents = changelog.parentrevs(r)
         if parents[0] in tostrip or parents[1] in tostrip:
             tostrip.append(r)
             if parents[1] != nullrev:
                 for p in parents:
                     if p not in tostrip and p > srev:
                         saveheads.append(p)
     return [r for r in tostrip if r not in saveheads]
 
 def strip(ui, repo, node, backup="all"):
     """Strip bookmarks if revisions are stripped using
     the mercurial.strip method. This usually happens during
     qpush and qpop"""
     revisions = _revstostrip(repo.changelog, node)
     marks = parse(repo)
     update = []
     for mark, n in marks.items():
         if repo.changelog.rev(n) in revisions:
             update.append(mark)
     oldstrip(ui, repo, node, backup)
     if len(update) > 0:
         for m in update:
             marks[m] = repo.changectx('.').node()
         write(repo, marks)
 
 oldstrip = mercurial.repair.strip
 mercurial.repair.strip = strip
 
 def reposetup(ui, repo):
     if not isinstance(repo, mercurial.localrepo.localrepository):
         return
 
     # init a bookmark cache as otherwise we would get a infinite reading
     # in lookup()
     repo._bookmarks = None
     repo._bookmarkcurrent = None
 
     class bookmark_repo(repo.__class__):
         def rollback(self):
             if os.path.exists(self.join('undo.bookmarks')):
                 util.rename(self.join('undo.bookmarks'), self.join('bookmarks'))
             return super(bookmark_repo, self).rollback()
 
         def lookup(self, key):
             if self._bookmarks is None:
                 self._bookmarks = parse(self)
             if key in self._bookmarks:
                 key = self._bookmarks[key]
             return super(bookmark_repo, self).lookup(key)
 
         def commit(self, *k, **kw):
             """Add a revision to the repository and
             move the bookmark"""
             node  = super(bookmark_repo, self).commit(*k, **kw)
             if node == None:
                 return None
             parents = repo.changelog.parents(node)
             if parents[1] == nullid:
                 parents = (parents[0],)
             marks = parse(repo)
             update = False
             for mark, n in marks.items():
                 if ui.configbool('bookmarks', 'track.current'):
                     if mark == current(repo) and n in parents:
                         marks[mark] = node
                         update = True
                 else:
                     if n in parents:
                         marks[mark] = node
                         update = True
             if update:
                 write(repo, marks)
             return node
 
         def addchangegroup(self, source, srctype, url, emptyok=False):
             parents = repo.dirstate.parents()
 
             result = super(bookmark_repo, self).addchangegroup(
                 source, srctype, url, emptyok)
             if result > 1:
                 # We have more heads than before
                 return result
             node = repo.changelog.tip()
             marks = parse(repo)
             update = False
             for mark, n in marks.items():
                 if n in parents:
                     marks[mark] = node
                     update = True
             if update:
                 write(repo, marks)
             return result
 
         def tags(self):
             """Merge bookmarks with normal tags"""
             if self.tagscache:
                 return self.tagscache
 
             tagscache = super(bookmark_repo, self).tags()
             tagscache.update(parse(repo))
             return tagscache
 
     repo.__class__ = bookmark_repo
 
 def pushnonbookmarked(orig, ui, repo, *args, **opts):
     'Call push with only the heads that are not bookmarked'
     if opts.get('non_bookmarked'):
         if opts.get('rev'):
             heads = [repo.lookup(r) for r in opts.get('rev')]
         else:
             heads = repo.heads()
 
         markheads = parse(repo).values()
         opts['rev'] = [head for head in heads if not(head in markheads)]
 
     orig(ui, repo, *args, **opts)
 
 def updatecurbookmark(orig, ui, repo, *args, **opts):
     '''Set the current bookmark
 
     If the user updates to a bookmark we update the .hg/bookmarks.current
     file.
     '''
     res = orig(ui, repo, *args, **opts)
     rev = opts['rev']
     if not rev and len(args) > 0:
         rev = args[0]
     setcurrent(repo, rev)
     return res
 
 def bookmarkonlylog(orig, ui, repo, *args, **opts):
     'Show revisions that are ancestors of given bookmark'
     if opts.get('only_bookmark'):
         if opts.get('rev'):
             raise util.Abort(_("you cannot use --rev and --only-bookmark"
                                " options simultaneously"))
         mark = opts['only_bookmark']
         if not mark in parse(repo):
             raise util.Abort(_("invalid bookmark name"))
         opts['rev'] = ['%s:null' % mark]
     orig(ui, repo, *args, **opts)
 
 def uisetup(ui):
     'Replace push with a decorator to provide --non-bookmarked option'
     entry = extensions.wrapcommand(commands.table, 'push', pushnonbookmarked)
     entry[1].append(('', 'non-bookmarked', None, _("push all heads that are not bookmarked")))
     if ui.configbool('bookmarks', 'track.current'):
         extensions.wrapcommand(commands.table, 'update', updatecurbookmark)
     entry = extensions.wrapcommand(commands.table, 'log', bookmarkonlylog)
     entry[1].append(('B', 'only-bookmark', '',
                      _("show only ancestors of given bookmark")))
 
 cmdtable = {
     "bookmarks":
         (bookmark,
          [('f', 'force', False, _('force')),
           ('r', 'rev', '', _('revision')),
           ('d', 'delete', False, _('delete a given bookmark')),
           ('m', 'rename', '', _('rename a given bookmark'))],
          _('hg bookmarks [-d] [-m NAME] [-r NAME] [NAME]')),
 }