ugh - works great in kitty. stinks in iterm and terminal.app. not sure why.

This is aggravating. I think what the problem is that Kitty uses one thing to mark, iTerm2 uses another, WezTerm uses another. We may have to remove this functionality altogether and allow people to use it in the pre-prompt and pre-execute hooks.

Research (K=Kitty, I=iTerm2, W=WezTerm) -

1. just before starting to draw the PS1 prompt
   K - 133;A
   I - OSC 133 ; A ST
   W - printf "\033]133;A;cl=m;aid=%s\007" "$$"

2. Just before starting to draw the PS2 prompt
   K - 133;A;k=s (k=s is for contiuation line)
   I - OSC 133 ; B ST
   W - PS1='[\e]133;P;k=i\a]'$PS1'[\e]133;B\a]' (k=i means default prompt)
   PS2='[\e]133;P;k=r\a]'$PS2'[\e]133;B\a]' (k=r means right prompt )

3. Just before running command
   K - 133;C
   I - OSC 133 ; C ST
   W - printf "\033]133;C;\007"

4. Command has finished
   K - ? maybe the same as iterm2 since it refers to the iterm2 docs?
   I - OSC 133 ; D ST
   W - printf "\033]133;D;%s;aid=%s\007" "$ret" "$$"

Docs on semantic prompts
https://gitlab.freedesktop.org/Per_Bothner/specifications/blob/master/proposals/semantic-prompts.md

I was looking into this in a TDD way. My idea was that the nu! macro can be invoked without -c and types the commands through stdin so that it renders the prompt into the output. That would enable the capturing of all chars (including the prompt) and could be used to run some assertions. However, I was unable to make that working.

@schrieveslaach I have just had a minor breakthrough with the latest main. I was able to use the pre-execute hook and the pre-command hook, to get this to work. So, I'm contemplating now whether this needs to be in nushell at all, epecially given that some terminals use different ways of doing this marking. Ping me here if you want to know what blocks I used so you can try it out yourself.

I think I finally figured it out. Markers are working in terminal.app, iterm2, wezterm, and kitty.

@fdncred, I tested the current main branch. Its working fine. Thanks for fixing!

@schrieveslaach you don't know how happy that makes me feel. this was a real battle for me to figure out how to do it. I would've given up if it weren't for the new hooks functionality.

I'm happy to use Nushell. 😉 Thanks for working on it.