class RepoError(Exception):

    pass

class repository(object):

    def capable(self, name):

        '''tell whether repo supports named capability.

        return False if not supported.

        if boolean capability, return True.

        if string capability, return string.'''

        name_eq = name + '='

        for cap in self.capabilities:

            if name == cap:

                return True

            if cap.startswith(name_eq):

                return cap[len(name_eq):]

        return False