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mapping.py
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# Copyright (C) 2007 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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"""Converters, etc for going between Bazaar and Git ids."""
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from bzrlib import errors, foreign
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from bzrlib.inventory import ROOT_ID
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from bzrlib.foreign import (
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        ForeignVcs, 
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        VcsMappingRegistry, 
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        ForeignRevision,
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        )
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def escape_file_id(file_id):
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    return file_id.replace('_', '__').replace(' ', '_s')
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def unescape_file_id(file_id):
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    return file_id.replace("_s", " ").replace("__", "_")
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class BzrGitMapping(foreign.VcsMapping):
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    """Class that maps between Git and Bazaar semantics."""
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    experimental = False
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    def __eq__(self, other):
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        return type(self) == type(other) and self.revid_prefix == other.revid_prefix
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    @classmethod
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    def revision_id_foreign_to_bzr(cls, git_rev_id):
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        """Convert a git revision id handle to a Bazaar revision id."""
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        return "%s:%s" % (cls.revid_prefix, git_rev_id)
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    @classmethod
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    def revision_id_bzr_to_foreign(cls, bzr_rev_id):
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        """Convert a Bazaar revision id to a git revision id handle."""
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        if not bzr_rev_id.startswith("%s:" % cls.revid_prefix):
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            raise errors.InvalidRevisionId(bzr_rev_id, cls)
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        return bzr_rev_id[len(cls.revid_prefix)+1:], cls()
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    @classmethod
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    def show_foreign_revid(cls, foreign_revid):
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        return { "git commit": foreign_revid }
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    def generate_file_id(self, path):
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        if path == "":
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            return ROOT_ID
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        return escape_file_id(path.encode('utf-8'))
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    def import_commit(self, commit):
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        """Convert a git commit to a bzr revision.
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        :return: a `bzrlib.revision.Revision` object.
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        """
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        if commit is None:
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            raise AssertionError("Commit object can't be None")
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        rev = ForeignRevision(commit.id, self, self.revision_id_foreign_to_bzr(commit.id))
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        rev.parent_ids = tuple([self.revision_id_foreign_to_bzr(p) for p in commit.parents])
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        rev.message = commit.message.decode("utf-8", "replace")
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        rev.committer = str(commit.committer).decode("utf-8", "replace")
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        if commit.committer != commit.author:
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            rev.properties['author'] = str(commit.author).decode("utf-8", "replace")
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        rev.timestamp = commit.commit_time
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        rev.timezone = 0
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        return rev
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class BzrGitMappingv1(BzrGitMapping):
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    revid_prefix = 'git-v1'
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    experimental = False
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class BzrGitMappingExperimental(BzrGitMappingv1):
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    revid_prefix = 'git-experimental'
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    experimental = True
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class GitMappingRegistry(VcsMappingRegistry):
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    def revision_id_bzr_to_foreign(self, bzr_revid):
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        if not bzr_revid.startswith("git-"):
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            raise errors.InvalidRevisionId(bzr_revid, None)
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        (mapping_version, git_sha) = bzr_revid.split(":", 1)
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        mapping = self.get(mapping_version)
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        return mapping.revision_id_bzr_to_foreign(bzr_revid)
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    parse_revision_id = revision_id_bzr_to_foreign
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mapping_registry = GitMappingRegistry()
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mapping_registry.register_lazy('git-v1', "bzrlib.plugins.git.mapping",
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                                   "BzrGitMappingv1")
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mapping_registry.register_lazy('git-experimental', "bzrlib.plugins.git.mapping",
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                                   "BzrGitMappingExperimental")
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class ForeignGit(ForeignVcs):
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    """Foreign Git."""
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    def __init__(self):
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        super(ForeignGit, self).__init__(mapping_registry)
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default_mapping = BzrGitMappingv1()
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foreign_git = ForeignGit()