Peter (Bill) Birch

This being experimental, it should be tried in Lua first.

Can I suggest adding builtin functions for tracing in the style of [set edit:prompt = ](https://elv.sh/ref/edit.html#prompts) . A function, which if defined, is called before an external command is executed?...

Maybe this needs to be in a seperate filter, ie `

This is a good idea because it saves programmer time. However, I had a look at the code changes needed - I will need a proper parser for dot notation,...