Forgive me if I haven't kept up with the Pd 0.45 improvements, but is there/will there be a vanilla mechanism to get the full path of the current patch/parent etc?

Basically, I'd like to be able to use the "pd open patch.pd /path/to/dir" open message in pure vanilla without hardcoding the path or relying on an external (ggee [getdir] does the job). As far as I know, there is no vanilla only way to do this, or am I wrong?