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Add NEWS entry about hg-git support.

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versionedfiles.py
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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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from bzrlib.revision import NULL_REVISION
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from bzrlib.versionedfile import VersionedFiles, AbsentContentFactory
 
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from dulwich.object_store import (
 
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    tree_lookup_path,
 
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    )
 
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from dulwich.objects import (
 
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    Blob,
 
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    Commit,
 
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    Tree,
 
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    )
 
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from bzrlib.versionedfile import (
 
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    AbsentContentFactory,
 
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    FulltextContentFactory,
 
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    VersionedFiles,
 
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    )
 
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class GitRevisions(VersionedFiles):
 
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    def __init__(self, object_store):
 
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        self.object_store = object_store
 
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    def check(self, progressbar=None):
 
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        return True
 
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    def iterkeys(self):
 
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        for sha in self.object_store:
 
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            if type(sha) == Commit:
 
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                yield (sha,)
 
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    def keys(self):
 
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        return list(self.iterkeys())
 
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    def add_mpdiffs(self, records):
 
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        raise NotImplementedError(self.add_mpdiffs)
 
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    def get_record_stream(self, keys, ordering, include_delta_closure):
 
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        for key in keys:
 
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            (sha,) = key
 
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            try:
 
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                commit = self.object_store[sha]
 
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            except KeyError:
 
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                yield AbsentContentFactory(key)
 
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            else:
 
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                yield FulltextContentFactory(key, 
 
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                    tuple([(p,) for p in commit.parents]), None, 
 
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                    commit.as_raw_string())
 
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    def get_parent_map(self, keys):
 
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        ret = {}
 
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        for (key,) in keys:
 
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            try:
 
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                ret[(key,)] = [(p,) for p in self.object_store[key].parents]
 
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            except KeyError:
 
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                ret[(key,)] = None
 
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        return ret
 
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class GitTexts(VersionedFiles):
 
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    """A texts VersionedFiles instance that is backed onto a Git object store."""
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    def __init__(self, repository):
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        self.repository = repository
 
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        self.object_store = self.repository._git.object_store
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    def check(self, progressbar=None):
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        return True
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    def get_record_stream(self, keys, ordering, include_delta_closure):
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        for key in keys:
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            yield AbsentContentFactory(key)
 
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            (fileid, revid) = key
 
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            (commit_id, mapping) = self.repository.lookup_git_revid(revid)
 
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            root_tree = self.object_store[commit_id].tree
 
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            path = mapping.parse_file_id(fileid)
 
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            try:
 
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                (mode, item_id) = tree_lookup_path(
 
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                    self.object_store.__getitem__, root_tree, path)
 
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                obj = self.object_store[item_id]
 
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            except KeyError:
 
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                yield AbsentContentFactory(key)
 
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            else:
 
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                if isinstance(obj, Tree):
 
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                    yield FulltextContentFactory(key, None, None, "")
 
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                elif isinstance(obj, Blob):
 
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                    yield FulltextContentFactory(key, None, None, obj.data)
 
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                else:
 
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                    raise AssertionError("file text resolved to %r" % obj)
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    def get_parent_map(self, keys):
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        raise NotImplementedError(self.get_parent_map)
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