class Option (optparse.Option):
ATTRS = optparse.Option.ATTRS + ['required']
def _check_required (self):
if self.required and not self.takes_value():
raise OptionError(
"required flag set for option that doesn't take a value",
self)
# Make sure _check_required() is called from the constructor!
CHECK_METHODS = optparse.Option.CHECK_METHODS + [_check_required]
def check_values (self, values, args):
for option in self.option_list:
if (isinstance(option, Option) and
option.required and
not self.option_seen.has_key(option)):
self.error("%s not supplied" % option)
return (values, args)