~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005-2010 Canonical Ltd

#

# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Helper functions for adding files to working trees."""

import sys

from bzrlib import (

    osutils,

    )

class AddAction(object):

    """A class which defines what action to take when adding a file."""

    def __init__(self, to_file=None, should_print=None):

        """Initialize an action which prints added files to an output stream.

        :param to_file: The stream to write into. This is expected to take

            Unicode paths. If not supplied, it will default to ``sys.stdout``.

        :param should_print: If False, printing will be suppressed.

        """

        self._to_file = to_file

        if to_file is None:

            self._to_file = sys.stdout

        self.should_print = False

        if should_print is not None:

            self.should_print = should_print

    def __call__(self, inv, parent_ie, path, kind, _quote=osutils.quotefn):

        """Add path to inventory.

        The default action does nothing.

        :param inv: The inventory we are working with.

        :param path: The FastPath being added

        :param kind: The kind of the object being added.

        """

        if self.should_print:

            self._to_file.write('adding %s\n' % _quote(path))

        return None

class AddFromBaseAction(AddAction):

    """This class will try to extract file ids from another tree."""

    def __init__(self, base_tree, base_path, to_file=None, should_print=None):

        super(AddFromBaseAction, self).__init__(to_file=to_file,

                                                should_print=should_print)

        self.base_tree = base_tree

        self.base_path = base_path

    def __call__(self, inv, parent_ie, path, kind):

        # Place the parent call

        # Now check to see if we can extract an id for this file

        file_id, base_path = self._get_base_file_id(path, parent_ie)

        if file_id is not None:

            if self.should_print:

                self._to_file.write('adding %s w/ file id from %s\n'

                                    % (path, base_path))

        else:

            # we aren't doing anything special, so let the default

            # reporter happen

            file_id = super(AddFromBaseAction, self).__call__(

                        inv, parent_ie, path, kind)

        return file_id

    def _get_base_file_id(self, path, parent_ie):

        """Look for a file id in the base branch.

        First, if the base tree has the parent directory,

        we look for a file with the same name in that directory.

        Else, we look for an entry in the base tree with the same path.

        """

        if self.base_tree.has_id(parent_ie.file_id):

            base_parent_ie = self.base_tree.inventory[parent_ie.file_id]

            base_child_ie = base_parent_ie.children.get(

                osutils.basename(path))

            if base_child_ie is not None:

                return (base_child_ie.file_id,

                        self.base_tree.id2path(base_child_ie.file_id))

        full_base_path = osutils.pathjoin(self.base_path, path)

        # This may return None, but it is our last attempt

        return self.base_tree.path2id(full_base_path), full_base_path