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# 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()
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