/brz/remove-bazaar

# Copyright (C) 2008 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, see <http://www.gnu.org/licenses/>.

"""Routines for saving and loading the id-map file."""

from __future__ import absolute_import

import os

def save_id_map(filename, revision_ids):

    """Save the mapping of commit ids to revision ids to a file.

    Throws the usual exceptions if the file cannot be opened,

    written to or closed.

    :param filename: name of the file to save the data to

    :param revision_ids: a dictionary of commit ids to revision ids.

    """

    with open(filename, 'wb') as f:

        for commit_id in revision_ids:

            f.write("%s %s\n" % (commit_id, revision_ids[commit_id]))

def load_id_map(filename):

    """Load the mapping of commit ids to revision ids from a file.

    If the file does not exist, an empty result is returned.

    If the file does exists but cannot be opened, read or closed,

    the normal exceptions are thrown.

    NOTE: It is assumed that commit-ids do not have embedded spaces.

    :param filename: name of the file to save the data to

    :result: map, count where:

      map = a dictionary of commit ids to revision ids;

      count = the number of keys in map

    """

    result = {}

    count = 0

    if os.path.exists(filename):

        f = open(filename)

        try:

            for line in f:

                parts = line[:-1].split(' ', 1)

                result[parts[0]] = parts[1]

                count += 1

        finally:

            f.close()

    return result, count