/brz/remove-bazaar

# Copyright (C) 2009 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""An object that maps git ref names to bzr branch names.  Note that it is not

used to map git ref names to bzr tag names."""

import re

class BranchMapper(object):

    _GIT_TRUNK_RE = re.compile('(?:git-)*trunk')

    def git_to_bzr(self, ref_name):

        """Map a git reference name to a Bazaar branch name.

        """

        parts = ref_name.split('/')

        if parts[0] == 'refs':

            parts.pop(0)

        category = parts.pop(0)

        if category == 'heads':

            git_name = '/'.join(parts)

            bazaar_name = self._git_to_bzr_name(git_name)

        else:

            if category == 'remotes' and parts[0] == 'origin':

                parts.pop(0)

            git_name = '/'.join(parts)

            if category.endswith('s'):

                category = category[:-1]

            name_no_ext = self._git_to_bzr_name(git_name)

            bazaar_name = "%s.%s" % (name_no_ext, category)

        return bazaar_name

    def _git_to_bzr_name(self, git_name):

        # Make a simple name more bzr-like, by mapping git 'master' to bzr 'trunk'.

        # To avoid collision, map git 'trunk' to bzr 'git-trunk'.  Likewise

        # 'git-trunk' to 'git-git-trunk' and so on, such that the mapping is

        # one-to-one in both directions.

        if git_name == 'master':

            bazaar_name = 'trunk'

        elif self._GIT_TRUNK_RE.match(git_name):

            bazaar_name = 'git-%s' % (git_name,)

        else:

            bazaar_name = git_name

        return bazaar_name