/usr/lib/meld/meld/util/prefs.py is in meld 1.5.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 | ### Copyright (C) 2002-2006 Stephen Kennedy <stevek@gnome.org>
### Copyright (C) 2011-2012 Kai Willadsen <kai.willadsen@gmail.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 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
"""Module to help implement 'instant-apply' preferences.
Usage:
import prefs
defaults = {
"colour" : prefs.Value(prefs.STRING, "red")
"size" : prefs.Value(prefs.INT, 10)
}
p = prefs.Preferences("/apps/myapp", defaults)
# use variables as if they were normal attributes.
draw(p.colour, p.size)
# settings are persistent
p.color = "blue"
"""
import os
import sys
import glib
class Value(object):
"""Represents a settable preference.
"""
__slots__ = ["type", "default", "current"]
def __init__(self, t, d):
"""Create a value.
t : a string : one of ("bool", "int", "string")
d : the default value, also the initial value
"""
self.type = t
self.default = d
self.current = d
# types of values allowed
BOOL = "bool"
INT = "int"
STRING = "string"
FLOAT = "float"
LIST = "list"
class GConfPreferences(object):
"""Persistent preferences object that handles preferences via gconf.
Example:
import prefs
defaults = {"spacing": prefs.Value(prefs.INT, 4),
"font": prefs.Value(prefs.STRING, "monospace") }
p = prefs.Prefs("myapp", defaults)
print p.font
p.font = "sans" # written to gconf too
p2 = prefs.Prefs("myapp", defaults)
print p.font # prints "sans"
"""
def __init__(self, rootkey, initial):
"""Create a preferences object.
Settings are initialised with 'initial' and then overriden
from values in the gconf database if available.
rootkey : the root gconf key where the values will be stored
initial : a dictionary of string to Value objects.
"""
self.__dict__["_gconf"] = gconf.client_get_default()
self.__dict__["_listeners"] = []
self.__dict__["_rootkey"] = rootkey
self.__dict__["_prefs"] = initial
self._gconf.add_dir(rootkey, gconf.CLIENT_PRELOAD_NONE)
self._gconf.notify_add(rootkey, self._on_preference_changed)
for key, value in self._prefs.items():
gval = self._gconf.get_without_default("%s/%s" % (rootkey, key))
if gval is not None:
if value.type == LIST:
# We only use/support str lists at the moment
val_tuple = getattr(gval, "get_%s" % value.type)()
value.current = [v.get_string() for v in val_tuple]
else:
value.current = getattr(gval, "get_%s" % value.type)()
def __getattr__(self, attr):
return self._prefs[attr].current
def get_default(self, attr):
return self._prefs[attr].default
def __setattr__(self, attr, val):
value = self._prefs[attr]
if value.current != val:
value.current = val
setfunc = getattr(self._gconf, "set_%s" % value.type)
if value.type == LIST:
# We only use/support str lists at the moment
setfunc("%s/%s" % (self._rootkey, attr), gconf.VALUE_STRING,
val)
else:
setfunc("%s/%s" % (self._rootkey, attr), val)
try:
for l in self._listeners:
l(attr, val)
except StopIteration:
pass
def _on_preference_changed(self, client, timestamp, entry, extra):
attr = entry.key[entry.key.rfind("/") + 1:]
try:
value = self._prefs[attr]
# Changes for unknown keys are ignored
except KeyError:
pass
else:
if entry.value is not None:
val = getattr(entry.value, "get_%s" % value.type)()
if value.type == LIST:
# We only use/support str lists at the moment
val = [v.get_string() for v in val]
setattr(self, attr, val)
# Setting a value to None deletes it and uses the default value
else:
setattr(self, attr, value.default)
def notify_add(self, callback):
"""Register a callback to be called when a preference changes.
callback : a callable object which take two parameters, 'attr' the
name of the attribute changed and 'val' the new value.
"""
self._listeners.append(callback)
def dump(self):
"""Print all preferences.
"""
for k, v in self._prefs.items():
print k, v.type, v.current
class ConfigParserPreferences(object):
"""Persistent preferences object that handles preferences via ConfigParser.
This preferences implementation is provided as a fallback for gconf-less
platforms. The ConfigParser library is included in Python and should be
available everywhere. The biggest drawbacks to this backend are lack of
access to desktop-wide settings, and lack of external change notification.
"""
def __init__(self, rootkey, initial):
"""Create a preferences object.
Settings are initialised with 'initial' and then overriden
from values in the ConfigParser database if available.
rootkey : unused (retained for compatibility with existing gconf API)
initial : a dictionary of string to Value objects.
"""
self.__dict__["_parser"] = ConfigParser.SafeConfigParser()
self.__dict__["_listeners"] = []
self.__dict__["_prefs"] = initial
self.__dict__["_type_mappings"] = {
BOOL: self._parser.getboolean,
INT: self._parser.getint,
STRING: self._parser.get,
FLOAT: self._parser.getfloat,
LIST: self._parser.get,
}
if sys.platform == "win32":
pref_dir = os.path.join(os.getenv("APPDATA"), "Meld")
else:
pref_dir = os.path.join(glib.get_user_config_dir(), "meld")
if not os.path.exists(pref_dir):
os.makedirs(pref_dir)
self.__dict__["_file_path"] = os.path.join(pref_dir, "meldrc.ini")
try:
config_file = open(self._file_path, "r")
try:
self._parser.readfp(config_file)
finally:
config_file.close()
except IOError:
# One-way move of old preferences
old_path = os.path.join(os.path.expanduser("~"), ".meld")
old_file_path = os.path.join(old_path, "meldrc.ini")
if os.path.exists(old_file_path):
try:
config_file = open(old_file_path, "r")
try:
self._parser.readfp(config_file)
finally:
config_file.close()
new_config_file = open(self._file_path, "w")
try:
self._parser.write(new_config_file)
finally:
new_config_file.close()
except IOError:
pass
for key, value in self._prefs.items():
if self._parser.has_option("DEFAULT", key):
value.current = self._type_mappings[value.type]("DEFAULT", key)
def __getattr__(self, attr):
return self._prefs[attr].current
def get_default(self, attr):
return self._prefs[attr].default
def __setattr__(self, attr, val):
value = self._prefs[attr]
if value.current != val:
value.current = val
self._parser.set(None, attr, str(val))
try:
fp = open(self._file_path, "w")
try:
self._parser.write(fp)
finally:
fp.close()
except IOError:
pass
try:
for l in self._listeners:
l(attr, val)
except StopIteration:
pass
def notify_add(self, callback):
"""Register a callback to be called when a preference changes.
callback : a callable object which take two parameters, 'attr' the
name of the attribute changed and 'val' the new value.
"""
self._listeners.append(callback)
def dump(self):
"""Print all preferences.
"""
for k, v in self._prefs.items():
print k, v.type, v.current
# Prefer gconf, falling back to ConfigParser
try:
import gconf
Preferences = GConfPreferences
except ImportError:
import ConfigParser
Preferences = ConfigParserPreferences
|