+
+# Environment variables should be decoded with filesystem encoding
+# otherwise this results in issues like #3854 #2918 #3217
+if sys.version_info >= (3, 0):
+ compat_getenv = os.getenv
+ compat_expanduser = os.path.expanduser
+else:
+ def compat_getenv(key, default=None):
+ env = os.getenv(key, default)
+ if env:
+ env = env.decode(get_filesystem_encoding())
+ return env
+
+ def compat_expanduser(path):
+ """Expand ~ and ~user constructs.
+
+ If user or $HOME is unknown, do nothing."""
+ if path[:1] != '~':
+ return path
+ i, n = 1, len(path)
+ while i < n and path[i] not in '/\\':
+ i += 1
+
+ if 'HOME' in os.environ:
+ userhome = compat_getenv('HOME')
+ elif 'USERPROFILE' in os.environ:
+ userhome = compat_getenv('USERPROFILE')
+ elif not 'HOMEPATH' in os.environ:
+ return path
+ else:
+ try:
+ drive = compat_getenv('HOMEDRIVE')
+ except KeyError:
+ drive = ''
+ userhome = os.path.join(drive, compat_getenv('HOMEPATH'))
+
+ if i != 1: # ~user
+ userhome = os.path.join(os.path.dirname(userhome), path[1:i])
+
+ return userhome + path[i:]
+
+