# Mercurial bookmark support code

#

# 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.

from mercurial.i18n import _

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

from mercurial import encoding

import os

def write(repo):

    '''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.

    '''

    refs = repo._bookmarks

    try:

        bms = repo.opener('bookmarks').read()

    except IOError:

        bms = ''

    repo.opener('undo.bookmarks', 'w').write(bms)

    if repo._bookmarkcurrent not in refs:

        setcurrent(repo, None)

    wlock = repo.wlock()

    try:

        file = repo.opener('bookmarks', 'w', atomictemp=True)

        for refspec, node in refs.iteritems():

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

        file.rename()

        # touch 00changelog.i so hgweb reloads bookmarks (no lock needed)

        try:

            os.utime(repo.sjoin('00changelog.i'), None)

        except OSError:

            pass

    finally:

        wlock.release()

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 recorded in .hg/bookmarks.current

    '''

    current = repo._bookmarkcurrent

    if current == mark:

        return

    refs = repo._bookmarks

    # do not update if we do update to a rev equal to the current bookmark

    if (mark and mark not in refs and

        current and refs[current] == repo.changectx('.').node()):

        return

    if mark not in refs:

        mark = ''

    wlock = repo.wlock()

    try:

        file = repo.opener('bookmarks.current', 'w', atomictemp=True)

        file.write(mark)

        file.rename()

    finally:

        wlock.release()

    repo._bookmarkcurrent = mark