~zyga/bzr-fastimport/fixes

# Copyright (C) 2009 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 reading/writing a marks file."""

from bzrlib.trace import warning

def import_marks(filename):

    """Read the mapping of marks to revision-ids from a file.

    :param filename: the file to read from

    :return: None if an error is encountered or a dictionary with marks

        as keys and revision-ids as values

    """

    # Check that the file is readable and in the right format

    try:

        f = file(filename)

    except IOError:

        warning("Could not import marks file %s - not importing marks",

            filename)

        return None

    # Read the revision info

    revision_ids = {}

    line = f.readline()

    if line == 'format=1\n':

        # Cope with old-style marks files

        # Read the branch info

        branch_names = {}

        for string in f.readline().rstrip('\n').split('\0'):

            if not string:

                continue

            name, integer = string.rsplit('.', 1)

            branch_names[name] = int(integer)

        line = f.readline()

    while line:

        line = line.rstrip('\n')

        mark, revid = line.split(' ', 1)

        mark = mark.lstrip(':')

        revision_ids[mark] = revid

        line = f.readline()

    f.close()

    return revision_ids

def export_marks(filename, revision_ids):

    """Save marks to a file.

    :param filename: filename to save data to

    :param revision_ids: dictionary mapping marks -> bzr revision-ids

    """

    try:

        f = file(filename, 'w')

    except IOError:

        warning("Could not open export-marks file %s - not exporting marks",

            filename)

        return

    # Write the revision info

    for mark, revid in revision_ids.iteritems():

        f.write(':%s %s\n' % (str(mark).lstrip(':'), revid))

    f.close()