I've always thought about integrating this functionality into elvish https://github.com/elves/elvish https://github.com/elves/elvish but cannot cone up with a g

I've always thought about integrating this functionality into elvish https://github.com/elves/elvish https://github.com/elves/elvish but cannot cone up with a good syntax. dgsh has a good one, but unfortunately using & breaks its traditional semantics. Does anyone has some idea of a tradition-compatible grammar? Also, to nitpick, this is more accurately called a directed acyclic graph shell, or simply a DAG shell. The language doesn't seem to allow cycles. dagsh reads nicer than dgsh too.