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bzrlib/branchbuilder.py
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        committer=None, timezone=None, message_callback=None):
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        """Build a commit, shaped in a specific way.
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        Most of the actions are self-explanatory.  'flush' is special action to
 
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        break a series of actions into discrete steps so that complex changes
 
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        (such as unversioning a file-id and re-adding it with a different kind)
 
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        can be expressed in a way that will clearly work.
 
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        :param revision_id: The handle for the new commit, can be None
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        :param parent_ids: A list of parent_ids to use for the commit.
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            It can be None, which indicates to use the last commit.
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            ('modify', ('file-id', 'new-content'))
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            ('unversion', 'file-id')
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            ('rename', ('orig-path', 'new-path'))
 
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            ('flush', None)
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        :param message: An optional commit message, if not supplied, a default
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            commit message will be written.
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        :param message_callback: A message callback to use for the commit, as
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            # inventory entry. And the only public function to create a
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            # directory is MemoryTree.mkdir() which creates the directory, but
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            # also always adds it. So we have to use a multi-pass setup.
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            to_add_directories = []
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            to_add_files = []
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            to_add_file_ids = []
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            to_add_kinds = []
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            new_contents = {}
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            to_unversion_ids = []
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            to_rename = []
 
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            pending = _PendingActions()
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            for action, info in actions:
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                if action == 'add':
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                    path, file_id, kind, content = info
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                    if kind == 'directory':
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                        to_add_directories.append((path, file_id))
 
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                        pending.to_add_directories.append((path, file_id))
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                    else:
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                        to_add_files.append(path)
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                        to_add_file_ids.append(file_id)
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                        to_add_kinds.append(kind)
 
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                        pending.to_add_files.append(path)
 
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                        pending.to_add_file_ids.append(file_id)
 
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                        pending.to_add_kinds.append(kind)
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                        if content is not None:
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                            new_contents[file_id] = content
 
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                            pending.new_contents[file_id] = content
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                elif action == 'modify':
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                    file_id, content = info
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                    new_contents[file_id] = content
 
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                    pending.new_contents[file_id] = content
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                elif action == 'unversion':
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                    to_unversion_ids.append(info)
 
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                    pending.to_unversion_ids.add(info)
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                elif action == 'rename':
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                    from_relpath, to_relpath = info
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                    to_rename.append((from_relpath, to_relpath))
 
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                    pending.to_rename.append((from_relpath, to_relpath))
 
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                elif action == 'flush':
 
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                    self._flush_pending(tree, pending)
 
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                    pending = _PendingActions()
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                else:
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                    raise ValueError('Unknown build action: "%s"' % (action,))
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            if to_unversion_ids:
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                tree.unversion(to_unversion_ids)
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            for path, file_id in to_add_directories:
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                if path == '':
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                    # Special case, because the path already exists
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                    tree.add([path], [file_id], ['directory'])
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                else:
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                    tree.mkdir(path, file_id)
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            for from_relpath, to_relpath in to_rename:
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                tree.rename_one(from_relpath, to_relpath)
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            tree.add(to_add_files, to_add_file_ids, to_add_kinds)
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            for file_id, content in new_contents.iteritems():
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                tree.put_file_bytes_non_atomic(file_id, content)
 
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            self._flush_pending(tree, pending)
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            return self._do_commit(tree, message=message, rev_id=revision_id,
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                timestamp=timestamp, timezone=timezone, committer=committer,
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                message_callback=message_callback)
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        finally:
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            tree.unlock()
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    def _flush_pending(self, tree, pending):
 
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        """Flush the pending actions in 'pending', i.e. apply them to 'tree'."""
 
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        for path, file_id in pending.to_add_directories:
 
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            if path == '':
 
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                old_id = tree.path2id(path)
 
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                if old_id is not None and old_id in pending.to_unversion_ids:
 
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                    # We're overwriting this path, no need to unversion
 
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                    pending.to_unversion_ids.discard(old_id)
 
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                # Special case, because the path already exists
 
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                tree.add([path], [file_id], ['directory'])
 
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            else:
 
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                tree.mkdir(path, file_id)
 
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        for from_relpath, to_relpath in pending.to_rename:
 
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            tree.rename_one(from_relpath, to_relpath)
 
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        if pending.to_unversion_ids:
 
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            tree.unversion(pending.to_unversion_ids)
 
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        tree.add(pending.to_add_files, pending.to_add_file_ids, pending.to_add_kinds)
 
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        for file_id, content in pending.new_contents.iteritems():
 
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            tree.put_file_bytes_non_atomic(file_id, content)
 
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    def get_branch(self):
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        """Return the branch created by the builder."""
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        return self._branch
 
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class _PendingActions(object):
 
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    """Pending actions for build_snapshot to take.
 
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    This is just a simple class to hold a bunch of the intermediate state of
 
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    build_snapshot in single object.
 
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    """
 
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    def __init__(self):
 
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        self.to_add_directories = []
 
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        self.to_add_files = []
 
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        self.to_add_file_ids = []
 
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        self.to_add_kinds = []
 
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        self.new_contents = {}
 
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        self.to_unversion_ids = set()
 
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        self.to_rename = []
 
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