macos: add AppleScript front window and focused terminal properties

[mitchellh]

This adds two new propeties to make it easy to get the frontmost (main) window and the focused terminal within a tab. We already had a property to get the selected tab of a tab group.

Examples

Send Input to Focused Terminal

tell application "Ghostty"
  set term to focused terminal of selected tab of front window
  input text "pwd\n" to term
end tell

Split the Focused Terminal

tell application "Ghostty"
  set currentTerm to focused terminal of selected tab of front window
  set newTerm to split currentTerm direction right
  input text "echo split-ready\n" to newTerm
end tell

[8bittts]

I was doing some tests of Applescript and the possibilities are so many! Excited that this was a focus for the team.

[mitchellh]

I was doing some tests of Applescript and the possibilities are so many! Excited that this was a focus for the team.

Yes! Awesome! Please let me know any weaknesses you find. This PR for example was thanks to some feedback I got from someone writing scripts on X. :)

[zachdaniel]

Last thing I need to perfect my riced up pane switching is a way to run an arbitrary script when pressing a key bind in Ghostty. The specific shape of my problem is that Claude Code consumes all input while open, so nushell never sees my CTRL+hjkl keys typed in to call my AppleScript that intelligently changes windows. If, however, I could execute an AppleScript on a key bind being pressed, then I could check the window title to see if I'm running nvim and if so I could send keys to neovim otherwise tell Ghostty to navigate.

As it stands now I can't find a way to navigate out of a Claude Code window 😢