# 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, incorporated herein by reference.

'''mercurial bookmarks

Mercurial bookmarks are local moveable pointers to changesets. Every bookmark

points to a changesets identified by it's 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)

'''

from mercurial.commands import templateopts, hex, short

from mercurial.i18n import _

from mercurial import cmdutil, util, commands, changelog

from mercurial.node import 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.

    '''

    util.copyfile(repo.join('bookmarks'), repo.join('undo.bookmarks'))

    file = repo.opener('bookmarks', 'w+')

    for refspec, node in refs.items():

        file.write("%s %s\n" % (hex(node), refspec))

    file.close()

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

    '''mercurial bookmarks

    Bookmarks are pointer 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 second [NAME] the bookmark is

    set to the bookmark that has that name. You can also pass revision

    identifiers to set bookmarks too.

    '''

    hexfn = ui.debugflag and hex or short

    marks = parse(repo)

    cur   = repo.changectx('.').node()

    if move:

        if move not in marks:

            raise util.Abort(_("a bookmark of this name doesnot exists"))

        if mark in marks and not force:

            raise util.Abort(_("a bookmark of the same name already exists"))

        marks[mark] = marks[move]

        del marks[move]

        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 exists"))

        del marks[mark]

        write(repo, marks)

        return

    if mark != None:

        if mark.strip().count("\n") > 0:

            raise Exception("bookmark cannot contain newlines")

        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 len(marks) == 0:

            ui.status("no bookmarks set\n")

        else:

            for bmark, n in marks.iteritems():

                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, changelog.rev(changelog.tip()) + 1):

        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 > striprev:

                        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)

    result = 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

    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)

            parents = repo.changelog.parents(node)

            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 node

        def addchangegroup(self, source, srctype, url, emptyok=False):

            try:

                onode = repo.changectx('.').node()

            except RepoError, inst:

                pass

            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 == onode:

                    marks[mark] = node

                    update = True

            if update:

                write(repo, marks)

            return result

    repo.__class__ = bookmark_repo

cmdtable = {

    "bookmarks":

        (bookmark,

         [('f', 'force', False, _('force')),

          ('r', 'rev', '', _('revision')),

          ('d', 'delete', False, _('delete a given bookmark')),

          ('m', 'move', '', _('move a given bookmark'))],

         _('hg bookmarks [-d] [-m NAME] [-r NAME] [NAME]')),

}