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# GNU Solfege - free ear training software
# Copied from http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/473846
# Copyright Christopher Arndt under the Python License.
import _winreg
SHELL_FOLDERS = r'Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders'
HKCU = _winreg.HKEY_CURRENT_USER
# helper functions
def _substenv(m):
return os.environ.get(m.group(1), m.group(0))
_env_rx = None
def expandvars(s):
"""Expand environment variables of form %var%.
Unknown variables are left unchanged.
"""
global _env_rx
if '%' not in s:
return s
if _env_rx is None:
import re
_env_rx = re.compile(r'%([^|<>=^%]+)%')
return _env_rx.sub(_substenv, s)
def _get_reg_value(key, subkey, name):
"""Return registry value specified by key, subkey, and name.
Environment variables in values of type REG_EXPAND_SZ are expanded
if possible.
"""
key = _winreg.OpenKey(key, subkey)
try:
ret = _winreg.QueryValueEx(key, name)
except WindowsError:
return None
else:
key.Close()
if ret[1] == _winreg.REG_EXPAND_SZ:
return expandvars(ret[0])
else:
return ret[0]
def _get_reg_user_value(key, name):
"""Return a windows registry value from the CURRENT_USER branch."""
return _get_reg_value(HKCU, key, name)
def get_appdata():
"""Return path of directory where apps should store user specific data."""
return _get_reg_user_value(SHELL_FOLDERS, 'AppData')
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