// TODO: ctrl etc
static bool onGlobalHotKey(S hotKey, fO r) {
  if (empty(hotKey)) false;
  final Int keyCode = mapGet(jNativeHook_keyCodes(), upper(hotKey));
  if (keyCode == null) ret false with print("Ignoring unknown hotkey: " + hotKey);
  onGlobalKeyPress(voidfunc(NativeKeyEvent e) {
    if (e.getKeyCode() == keyCode && e.getModifiers() == 0)
      callF(r);
  });
  print("Hotkey registered: " + hotKey);
  true;
}