/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, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Routines for reading/writing a marks file."""

import re

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 (revision_ids, branch_names)

      where

      * revision_ids is a dictionary with marks as keys and revision-ids

        as values

      * branch_names is a dictionary mapping branch names to some magic #

    """

    # 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

    firstline = f.readline()

    match = re.match(r'^format=(\d+)$', firstline)

    if not match:

        warning("%r doesn't look like a marks file - not importing marks",

            filename)

        return None

    elif match.group(1) != '1':

        warning('format version in marks file %s not supported - not importing'

            'marks', filename)

        return None

    # 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)

    # Read the revision info

    revision_ids = {}

    for line in f:

        line = line.rstrip('\n')

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

        revision_ids[mark] = revid

    f.close()

    return (revision_ids, branch_names)

def export_marks(filename, revision_ids, branch_names=None):

    """Save marks to a file.

    :param filename: filename to save data to

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

    :param branch_names: dictionary mapping branch names to some magic #

    """

    try:

        f = file(filename, 'w')

    except IOError:

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

            filename)

        return

    f.write('format=1\n')

    # Write the branch names line

    if branch_names:

        branch_names = [ '%s.%d' % x for x in branch_names.iteritems() ]

        f.write('\0'.join(branch_names) + '\n')

    else:

        f.write('\0tmp.0\n')

    # Write the revision info

    for mark, revid in revision_ids.iteritems():

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

    f.close()