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Add simple HACKING document.

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repository.py
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# Copyright (C) 2007 Canonical Ltd
 
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# Copyright (C) 2008-2009 Jelmer Vernooij <jelmer@samba.org>
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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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"""An adapter between a Git Repository and a Bazaar Branch"""
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import dulwich as git
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import os
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import time
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from bzrlib.plugins.git.foreign import (
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    versionedfiles,
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    )
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from bzrlib.plugins.git.mapping import default_mapping, mapping_registry, inventory_to_tree_and_blobs, revision_to_commit
 
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from bzrlib.plugins.git.mapping import (
 
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    default_mapping,
 
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    inventory_to_tree_and_blobs,
 
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    mapping_registry,
 
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    revision_to_commit,
 
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    )
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from bzrlib.plugins.git.versionedfiles import GitTexts
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import dulwich as git
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class GitTags(object):
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    def all_revision_ids(self):
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        ret = set([revision.NULL_REVISION])
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        if self._git.heads() == []:
 
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        heads = self._git.heads()
 
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        if heads == {}:
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            return ret
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        bzr_heads = [self.get_mapping().revision_id_foreign_to_bzr(h) for h in self._git.heads()]
 
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        bzr_heads = [self.get_mapping().revision_id_foreign_to_bzr(h) for h in heads.itervalues()]
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        ret = set(bzr_heads)
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        graph = self.get_graph()
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        for rev, parents in graph.iter_ancestry(bzr_heads):
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        """See Repository.get_ancestry().
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        """
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        if revision_id is None:
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            return self._all_revision_ids()
 
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            return [None, revision.NULL_REVISION] + self._all_revision_ids()
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        assert isinstance(revision_id, str)
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        ancestry = []
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        graph = self.get_graph()
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        for rev, parents in graph.iter_ancestry([revision_id]):
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            if rev == revision.NULL_REVISION:
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                rev = None
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            ancestry.append(rev)
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        ancestry.reverse()
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        return ancestry
 
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        return [None] + ancestry
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    def import_revision_gist(self, source, revid, parent_lookup):
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        """Impor the gist of another revision into this Git repository.
 
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        """Import the gist of a revision into this Git repository.
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        """
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        objects = []
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        return commit.sha().hexdigest()
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    def dfetch(self, source, stop_revision):
 
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        """Import the gist of the ancestry of a particular revision."""
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        if stop_revision is None:
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            raise NotImplementedError
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        revidmap = {}