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# Copyright (C) 2009, 2010 Roman Zimbelmann <romanz@lavabit.com>
#
# 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 3 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/>.
class Tags(object):
def __init__(self, filename):
from os.path import isdir, exists, dirname, abspath, realpath, expanduser
self._filename = realpath(abspath(expanduser(filename)))
if isdir(dirname(self._filename)) and not exists(self._filename):
open(self._filename, 'w')
self.sync()
def __contains__(self, item):
return item in self.tags
def add(self, *items):
self.sync()
for item in items:
self.tags.add(item)
self.dump()
def remove(self, *items):
self.sync()
for item in items:
try:
self.tags.remove(item)
except KeyError:
pass
self.dump()
def toggle(self, *items):
self.sync()
for item in items:
if item in self:
try:
self.tags.remove(item)
except KeyError:
pass
else:
self.tags.add(item)
self.dump()
def sync(self):
try:
f = open(self._filename, 'r')
except OSError:
pass
else:
self.tags = self._parse(f)
f.close()
def dump(self):
try:
f = open(self._filename, 'w')
except OSError:
pass
else:
self._compile(f)
f.close()
def _compile(self, f):
for line in self.tags:
f.write(line + '\n')
def _parse(self, f):
result = set()
for line in f:
result.add(line.strip())
return result
def __nonzero__(self):
return True
__bool__ = __nonzero__
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