I'm guessing that we'd support such a functionality. You can see all the commandline commands now with help commandline in nushell. maybe a commandline set-selection and commandline get-selection to follow the current commands?

Just checked the source code on the main branch. Only get-cursor and set-cursor are implemented. I'd like to have 2-int (start, end) version of them.

Right, I was suggesting that you write some new commands to support the functionality you're describing.

Hi @fdncred , I'd like to discuss the design choice here. Why we use a ReplState instead of just a Reedline editor in struct EngineState? Seems that the set-selection function (or any other feature that requires reedline editor involved) is impossible to implement in trait Command?

I'm not sure. I don't understand reedline's internals enough to help answer.