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+++ b/pytouhou/utils/xdg.py
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+# -*- encoding: utf-8
+"""
+This module is based on a rox module (LGPL):
+
+http://cvs.sourceforge.net/viewcvs.py/rox/ROX-Lib2/python/rox/basedir.py?rev=1.9&view=log
+
+The freedesktop.org Base Directory specification provides a way for
+applications to locate shared data and configuration:
+
+    http://standards.freedesktop.org/basedir-spec/
+
+(based on version 0.6)
+
+This module can be used to load and save from and to these directories.
+
+Typical usage:
+
+    from rox import basedir
+    
+    for dir in basedir.load_config_paths('mydomain.org', 'MyProg', 'Options'):
+        print "Load settings from", dir
+
+    dir = basedir.save_config_path('mydomain.org', 'MyProg')
+    print >>file(os.path.join(dir, 'Options'), 'w'), "foo=2"
+
+Note: see the rox.Options module for a higher-level API for managing options.
+"""
+
+import os
+
+_home = os.path.expanduser('~')
+xdg_config_home = os.environ.get('XDG_CONFIG_HOME') or \
+    os.path.join(_home, '.config')
+
+xdg_config_dirs = [xdg_config_home] + \
+    (os.environ.get('XDG_CONFIG_DIRS') or '/etc/xdg').split(':')
+
+xdg_config_dirs = [x for x in xdg_config_dirs if x]
+
+
+def save_config_path(*resource):
+    resource = os.path.join(*resource)
+    assert not resource.startswith('/')
+    path = os.path.join(xdg_config_home, resource)
+    if not os.path.isdir(path):
+        os.makedirs(path, 0o700)
+    return path
+
+
+def load_config_paths(*resource):
+    resource = os.path.join(*resource)
+    for config_dir in xdg_config_dirs:
+        path = os.path.join(config_dir, resource)
+        if os.path.exists(path):
+            yield path