Get configuration for the current used listing.

def _config(self, args, config):
        """ Get configuration for the current used listing.
        """
        listings = dict((x.args, x) for x in config.subsections('listing'))
        listing = listings.get(args.listing)
        if listing is None:
            if args.listing == u'default':
                return {'pattern': self._profile.list_default_pattern,
                        'order': self._profile.list_default_order}
            else:
                raise KolektoRuntimeError('Unknown listing %r' % args.listing)
        else:
            return {'pattern': listing.get('pattern'),
                    'order': listing.get('order')}