def get_package_url(cls, package, session=None, silent=False):
        response = get("{}/packages/{}".format(cls.bower_base_uri, package))
        return response.json().get("url", None)
def matchfn(self, f):
        # XXX: is_dir is set to True here for performance.
        # It should be set to whether "f" is actually a directory or not.
        return self._matcher.match_relative(f, True)