/brz/remove-bazaar

# Copyright (C) 2008 Jelmer Vernooij <jelmer@samba.org>

#

# 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

"""Foreign branch utilities."""

from bzrlib import errors, registry

from bzrlib.branch import Branch

from bzrlib.commands import Command, Option

from bzrlib.errors import InvalidRevisionId

from bzrlib.revision import Revision

from bzrlib.trace import info

class VcsMapping(object):

    """Describes the mapping between the semantics of Bazaar and a foreign vcs.

    """

    # Whether this is an experimental mapping that is still open to changes.

    experimental = False

    # Whether this mapping supports exporting and importing all bzr semantics.

    roundtripping = False

    # Prefix used when importing native foreign revisions (not roundtripped) 

    # using this mapping.

    revid_prefix = None

    def revision_id_bzr_to_foreign(self, bzr_revid):

        """Parse a bzr revision id and convert it to a foreign revid.

        :param bzr_revid: The bzr revision id (a string).

        :return: A foreign revision id, can be any sort of object.

        """

        raise NotImplementedError(self.revision_id_bzr_to_foreign)

    def revision_id_foreign_to_bzr(self, foreign_revid):

        """Parse a foreign revision id and convert it to a bzr revid.

        :param foreign_revid: Foreign revision id, can be any sort of object.

        :return: A bzr revision id.

        """

        raise NotImplementedError(self.revision_id_foreign_to_bzr)

    def show_foreign_revid(self, foreign_revid):

        """Prepare a foreign revision id for formatting using bzr log.

        :param foreign_revid: Foreign revision id.

        :return: Dictionary mapping string keys to string values.

        """

        return { }

class VcsMappingRegistry(registry.Registry):

    """Registry for Bazaar<->foreign VCS mappings.

    There should be one instance of this registry for every foreign VCS.

    """

    def register(self, key, factory, help):

        """Register a mapping between Bazaar and foreign VCS semantics.

        The factory must be a callable that takes one parameter: the key.

        It must produce an instance of VcsMapping when called.

        """

        registry.Registry.register(self, key, factory, help)

    def set_default(self, key):

        """Set the 'default' key to be a clone of the supplied key.

        This method must be called once and only once.

        """

        self._set_default_key(key)

    def get_default(self):

        """Convenience function for obtaining the default mapping to use."""

        return self.get(self._get_default_key())

class ForeignBranch(Branch):

    """Branch that exists in a foreign version control system."""

    def __init__(self, mapping):

        super(ForeignBranch, self).__init__()

        self.mapping = mapping

    def dpull(self, source, stop_revision=None):

        """Pull deltas from another branch.

        :note: This does not, like pull, retain the revision ids from 

        the source branch.

        :param source: Source branch

        :param stop_revision: Revision to pull, defaults to last revision.

        """

        raise NotImplementedError(self.pull)

class FakeControlFiles(object):

    """Dummy implementation of ControlFiles.

    This is required as some code relies on controlfiles being 

    available."""

    def get_utf8(self, name):

        raise errors.NoSuchFile(name)

    def get(self, name):

        raise errors.NoSuchFile(name)

    def break_lock(self):

        pass

class cmd_dpush(Command):

    """Push diffs into a foreign version control system without any 

    Bazaar-specific metadata.

    This will afterwards rebase the local Bazaar branch on the remote

    branch unless the --no-rebase option is used, in which case 

    the two branches will be out of sync. 

    """

    takes_args = ['location?']

    takes_options = ['remember', Option('directory',

            help='Branch to push from, '

                 'rather than the one containing the working directory.',

            short_name='d',

            type=unicode,

            ),

            Option('no-rebase', help="Don't rebase after push")]

    def run(self, location=None, remember=False, directory=None, 

            no_rebase=False):

        from bzrlib import urlutils

        from bzrlib.bzrdir import BzrDir

        from bzrlib.errors import BzrCommandError, NoWorkingTree

        from bzrlib.workingtree import WorkingTree

        if directory is None:

            directory = "."

        try:

            source_wt = WorkingTree.open_containing(directory)[0]

            source_branch = source_wt.branch

        except NoWorkingTree:

            source_branch = Branch.open_containing(directory)[0]

            source_wt = None

        stored_loc = source_branch.get_push_location()

        if location is None:

            if stored_loc is None:

                raise BzrCommandError("No push location known or specified.")

            else:

                display_url = urlutils.unescape_for_display(stored_loc,

                        self.outf.encoding)

                self.outf.write("Using saved location: %s\n" % display_url)

                location = stored_loc

        bzrdir = BzrDir.open(location)

        target_branch = bzrdir.open_branch()

        target_branch.lock_write()

        if not isinstance(target_branch, ForeignBranch):

            info("target branch is not a foreign branch, using regular push.")

            target_branch.pull(source_branch)

            no_rebase = True

        else:

            revid_map = target_branch.dpull(source_branch)

        # We successfully created the target, remember it

        if source_branch.get_push_location() is None or remember:

            source_branch.set_push_location(target_branch.base)

        if not no_rebase:

            _, old_last_revid = source_branch.last_revision_info()

            new_last_revid = revid_map[old_last_revid]

            if source_wt is not None:

                source_wt.pull(target_branch, overwrite=True, 

                               stop_revision=new_last_revid)

            else:

                source_branch.pull(target_branch, overwrite=True, 

                                   stop_revision=new_last_revid)

def test_suite():

    from unittest import TestSuite

    from bzrlib.tests import TestUtil

    loader = TestUtil.TestLoader()

    suite = TestSuite()

    testmod_names = ['test_versionedfiles', ]

    suite.addTest(loader.loadTestsFromModuleNames(testmod_names))

    return suite

def escape_commit_message(message):

    """Replace xml-incompatible control characters."""

    if message is None:

        return None

    import re

    # FIXME: RBC 20060419 this should be done by the revision

    # serialiser not by commit. Then we can also add an unescaper

    # in the deserializer and start roundtripping revision messages

    # precisely. See repository_implementations/test_repository.py

    # Python strings can include characters that can't be

    # represented in well-formed XML; escape characters that

    # aren't listed in the XML specification

    # (http://www.w3.org/TR/REC-xml/#NT-Char).

    message, _ = re.subn(

        u'[^\x09\x0A\x0D\u0020-\uD7FF\uE000-\uFFFD]+',

        lambda match: match.group(0).encode('unicode_escape'),

        message)

    return message

class ForeignRevision(Revision):

    """A Revision from a Foreign repository. Remembers 

    information about foreign revision id and mapping.

    """

    def __init__(self, foreign_revid, mapping, *args, **kwargs):

        super(ForeignRevision, self).__init__(*args, **kwargs)

        self.foreign_revid = foreign_revid

        self.mapping = mapping

def show_foreign_properties(mapping_registry, rev):

    """Custom log displayer for foreign revision identifiers.

    :param rev: Revision object.

    """

    # Revision comes directly from a foreign repository

    if isinstance(rev, ForeignRevision):

        return rev.mapping.show_foreign_revid(rev.foreign_revid)

    # Revision was once imported from a foreign repository

    try:

        foreign_revid, mapping = mapping_registry.parse_revision_id(rev.revision_id)

    except InvalidRevisionId:

        return {}

    return mapping.show_foreign_revid(foreign_revid)