/brz/remove-bazaar

# 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 ...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 = open(filename, 'rb')

    except IOError:

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

                filename)

        return None

    try:

        # Read the revision info

        revision_ids = {}

        line = f.readline()

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

            # Cope with old-style marks files

            # Read the branch info

            branch_names = {}

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

                if not string:

                    continue

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

                branch_names[name] = int(integer)

            line = f.readline()

        while line:

            line = line.rstrip(b'\n')

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

            mark = mark.lstrip(b':')

            revision_ids[mark] = revid

            line = f.readline()

    finally:

        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 = open(filename, 'wb')

    except IOError:

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

                filename)

        return

    try:

        # Write the revision info

        for mark, revid in sorted(revision_ids.items()):

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

    finally:

        f.close()