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# Copyright (C) 2009, 2010, 2011 Roman Zimbelmann <romanz@lavabit.com>
# This software is distributed under the terms of the GNU GPL version 3.
from os.path import isdir, exists, dirname, abspath, realpath, expanduser
import string
ALLOWED_KEYS = string.ascii_letters + string.digits + string.punctuation
class Tags(object):
default_tag = '*'
def __init__(self, filename):
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, **others):
if 'tag' in others:
tag = others['tag']
else:
tag = self.default_tag
self.sync()
for item in items:
self.tags[item] = tag
self.dump()
def remove(self, *items):
self.sync()
for item in items:
try:
del(self.tags[item])
except KeyError:
pass
self.dump()
def toggle(self, *items, **others):
if 'tag' in others:
tag = others['tag']
else:
tag = self.default_tag
tag = str(tag)
if tag not in ALLOWED_KEYS:
return
self.sync()
for item in items:
try:
if item in self and tag in (self.tags[item], self.default_tag):
del(self.tags[item])
else:
self.tags[item] = tag
except KeyError:
pass
self.dump()
def marker(self, item):
if item in self.tags:
return self.tags[item]
else:
return self.default_tag
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 path, tag in self.tags.items():
if tag == self.default_tag:
# COMPAT: keep the old format if the default tag is used
f.write(path + '\n')
elif tag in ALLOWED_KEYS:
f.write('{0}:{1}\n'.format(tag, path))
def _parse(self, f):
result = dict()
for line in f:
line = line.strip()
if len(line) > 2 and line[1] == ':':
tag, path = line[0], line[2:]
if tag in ALLOWED_KEYS:
result[path] = tag
else:
result[line] = self.default_tag
return result
def __nonzero__(self):
return True
__bool__ = __nonzero__
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