# Mercurial extension to provide the 'hg bookmark' command

#

# Copyright 2008 David Soria Parra <dsp@php.net>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

'''track a line of development with movable markers

Bookmarks are local movable markers 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 shifts to the new changeset.

It is possible to use bookmark names in every revision lookup (e.g.

:hg:`merge`, :hg:`update`).

By default, when several bookmarks point to the same changeset, they

will all move forward together. It is possible to obtain a more

git-like experience by adding the following configuration option to

your configuration file::

  [bookmarks]

  track.current = True

This will cause Mercurial to track the bookmark that you are currently

using, and only update it. This is similar to git's approach to

branching.

'''

from mercurial.i18n import _

from mercurial.node import nullid, nullrev, bin, hex, short

from mercurial import util, commands, repair, extensions, pushkey, hg, url

from mercurial import revset, encoding

from mercurial import bookmarks

import os

def bookmark(ui, repo, mark=None, rev=None, force=False, delete=False, rename=None):

    '''track a line of development with movable markers

    Bookmarks are pointers to certain commits that move when

    committing. Bookmarks are local. They can be renamed, copied and

    deleted. It is possible to use bookmark names in :hg:`merge` and

    :hg:`update` to merge and update respectively to a given bookmark.

    You can use :hg:`bookmark NAME` to set a bookmark on the working

    directory's parent revision with the given name. If you specify

    a revision using -r REV (where REV may be an existing bookmark),

    the bookmark is assigned to that revision.

    Bookmarks can be pushed and pulled between repositories (see :hg:`help

    push` and :hg:`help pull`). This requires the bookmark extension to be

    enabled for both the local and remote repositories.

    '''

    hexfn = ui.debugflag and hex or short

    marks = repo._bookmarks

    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]

        if repo._bookmarkcurrent == rename:

            bookmarks.setcurrent(repo, mark)

        bookmarks.write(repo)

        return

    if delete:

        if mark is None:

            raise util.Abort(_("bookmark name required"))

        if mark not in marks:

            raise util.Abort(_("a bookmark of this name does not exist"))

        if mark == repo._bookmarkcurrent:

            bookmarks.setcurrent(repo, None)

        del marks[mark]

        bookmarks.write(repo)

        return

    if mark is not None:

        if "\n" in mark:

            raise util.Abort(_("bookmark name cannot contain newlines"))

        mark = mark.strip()

        if not mark:

            raise util.Abort(_("bookmark names cannot consist entirely of "

                               "whitespace"))

        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()

        bookmarks.setcurrent(repo, mark)

        bookmarks.write(repo)

        return

    if mark is 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'):

                    current = repo._bookmarkcurrent

                    if bmark == current and n == cur:

                        prefix, label = '*', 'bookmarks.current'

                    else:

                        prefix, label = ' ', ''

                else:

                    if n == cur:

                        prefix, label = '*', 'bookmarks.current'

                    else:

                        prefix, label = ' ', ''

                if ui.quiet:

                    ui.write("%s\n" % bmark, label=label)

                else:

                    ui.write(" %s %-25s %d:%s\n" % (

                        prefix, bmark, repo.changelog.rev(n), hexfn(n)),

                        label=label)

        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(oldstrip, 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 = repo._bookmarks

    update = []

    for mark, n in marks.iteritems():

        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()

        bookmarks.write(repo)

def reposetup(ui, repo):

    if not repo.local():

        return

    class bookmark_repo(repo.__class__):

        @util.propertycache

        def _bookmarks(self):

        @util.propertycache

        def _bookmarkcurrent(self):

        def rollback(self, dryrun=False):

            if os.path.exists(self.join('undo.bookmarks')):

                if not dryrun:

                    util.rename(self.join('undo.bookmarks'), self.join('bookmarks'))

                elif not os.path.exists(self.sjoin("undo")):

                    # avoid "no rollback information available" message

                    return 0

            return super(bookmark_repo, self).rollback(dryrun)

        def lookup(self, key):

            if key in self._bookmarks:

                key = self._bookmarks[key]

            return super(bookmark_repo, self).lookup(key)

        def _bookmarksupdate(self, parents, node):

            marks = self._bookmarks

            update = False

            if ui.configbool('bookmarks', 'track.current'):

                mark = self._bookmarkcurrent

                if mark and marks[mark] in parents:

                    marks[mark] = node

                    update = True

            else:

                for mark, n in marks.items():

                    if n in parents:

                        marks[mark] = node

                        update = True

            if update:

                bookmarks.write(self)

        def commitctx(self, ctx, error=False):

            """Add a revision to the repository and

            move the bookmark"""

            wlock = self.wlock() # do both commit and bookmark with lock held

            try:

                node  = super(bookmark_repo, self).commitctx(ctx, error)

                if node is None:

                    return None

                parents = self.changelog.parents(node)

                if parents[1] == nullid:

                    parents = (parents[0],)

                self._bookmarksupdate(parents, node)

                return node

            finally:

                wlock.release()

        def pull(self, remote, heads=None, force=False):

            result = super(bookmark_repo, self).pull(remote, heads, force)

            self.ui.debug("checking for updated bookmarks\n")

            rb = remote.listkeys('bookmarks')

            changed = False

            for k in rb.keys():

                if k in self._bookmarks:

                    nr, nl = rb[k], self._bookmarks[k]

                    if nr in self:

                        cr = self[nr]

                        cl = self[nl]

                        if cl.rev() >= cr.rev():

                            continue

                        if cr in cl.descendants():

                            self._bookmarks[k] = cr.node()

                            changed = True

                            self.ui.status(_("updating bookmark %s\n") % k)

                        else:

                            self.ui.warn(_("not updating divergent"

                                           " bookmark %s\n") % k)

            if changed:

                bookmarks.write(repo)

            return result

        def push(self, remote, force=False, revs=None, newbranch=False):

            result = super(bookmark_repo, self).push(remote, force, revs,

                                                     newbranch)

            self.ui.debug("checking for updated bookmarks\n")

            rb = remote.listkeys('bookmarks')

            for k in rb.keys():

                if k in self._bookmarks:

                    nr, nl = rb[k], hex(self._bookmarks[k])

                    if nr in self:

                        cr = self[nr]

                        cl = self[nl]

                        if cl in cr.descendants():

                            r = remote.pushkey('bookmarks', k, nr, nl)

                            if r:

                                self.ui.status(_("updating bookmark %s\n") % k)

                            else:

                                self.ui.warn(_('updating bookmark %s'

                                               ' failed!\n') % k)

            return result

        def addchangegroup(self, *args, **kwargs):

            result = super(bookmark_repo, self).addchangegroup(*args, **kwargs)

            if result > 1:

                # We have more heads than before

                return result

            node = self.changelog.tip()

            parents = self.dirstate.parents()

            self._bookmarksupdate(parents, node)

            return result

        def _findtags(self):

            """Merge bookmarks with normal tags"""

            (tags, tagtypes) = super(bookmark_repo, self)._findtags()

            tags.update(self._bookmarks)

            return (tags, tagtypes)

        if hasattr(repo, 'invalidate'):

            def invalidate(self):

                super(bookmark_repo, self).invalidate()

                for attr in ('_bookmarks', '_bookmarkcurrent'):

                    if attr in self.__dict__:

                        delattr(self, attr)

    repo.__class__ = bookmark_repo

def listbookmarks(repo):

    # We may try to list bookmarks on a repo type that does not

    # support it (e.g., statichttprepository).

    if not hasattr(repo, '_bookmarks'):

        return {}

    d = {}

    for k, v in repo._bookmarks.iteritems():

        d[k] = hex(v)

    return d

def pushbookmark(repo, key, old, new):

    w = repo.wlock()

    try:

        marks = repo._bookmarks

        if hex(marks.get(key, '')) != old:

            return False

        if new == '':

            del marks[key]

        else:

            if new not in repo:

                return False

            marks[key] = repo[new].node()

        bookmarks.write(repo)

        return True

    finally:

        w.release()

def pull(oldpull, ui, repo, source="default", **opts):

    # translate bookmark args to rev args for actual pull

    if opts.get('bookmark'):

        # this is an unpleasant hack as pull will do this internally

        source, branches = hg.parseurl(ui.expandpath(source),

                                       opts.get('branch'))

        other = hg.repository(hg.remoteui(repo, opts), source)

        rb = other.listkeys('bookmarks')

        for b in opts['bookmark']:

            if b not in rb:

                raise util.Abort(_('remote bookmark %s not found!') % b)

            opts.setdefault('rev', []).append(b)

    result = oldpull(ui, repo, source, **opts)

    # update specified bookmarks

    if opts.get('bookmark'):

        for b in opts['bookmark']:

            # explicit pull overrides local bookmark if any

            ui.status(_("importing bookmark %s\n") % b)

            repo._bookmarks[b] = repo[rb[b]].node()

        bookmarks.write(repo)

    return result

def push(oldpush, ui, repo, dest=None, **opts):

    dopush = True

    if opts.get('bookmark'):

        dopush = False

        for b in opts['bookmark']:

            if b in repo._bookmarks:

                dopush = True

                opts.setdefault('rev', []).append(b)

    result = 0

    if dopush:

        result = oldpush(ui, repo, dest, **opts)

    if opts.get('bookmark'):

        # this is an unpleasant hack as push will do this internally

        dest = ui.expandpath(dest or 'default-push', dest or 'default')