Add Ghostty.app support

[weijing24]

Summary

• Add Ghostty as a supported terminal on macOS, alongside Terminal.app and iTerm2.app
• Ghostty is automated via its native AppleScript API (introduced in v1.3.0), using surface configuration objects for working directory and initial input
• Supports new windows, new tabs, horizontal/vertical splits (-h/-v), tab titles (-t), background mode (-g/-G), and auto-detection via $TERM_PROGRAM
• Named profiles (-s) are not supported in Ghostty; a warning is emitted if specified

Implementation details

• Detection: $TERM_PROGRAM == 'ghostty', explicit via -a Ghostty, or fallback via mdfind with bundle ID com.mitchellh.ghostty
• Tab/window creation: new tab in front window / new window with surface configuration
• Splits: split right (vertical) / split down (horizontal) on the focused terminal
• Working directory: Set via initial working directory on the surface configuration (no cd prepend needed)
• Commands: Sent via initial input on the surface configuration with & return
• Tab titles: set name of selected tab of front window
• Background (-G): Save/restore via select tab and AXRaise GUI scripting

Test plan

• ttab — open new tab (inherits working directory)
• ttab -w — open new window
• ttab -v / ttab -h — vertical/horizontal splits
• ttab -G <cmd> — background tab with command
• ttab -t "title" — custom tab title
• ttab -d /path — explicit working directory
• ttab -s profile — warns that profiles are unsupported
• --dry-run output verified for all combinations

[mklement0]

@weijing24, I appreciate your contribution, but there are a number of problems:

• Some of the commands don't work:

  • ttab -h / ttab -v yields: Ghostty got an error: Can’t make down into type specifier. (-1700)

  • ttab -t foo yields: 322:371: execution error: Ghostty got an error: Can’t set name of tab to "foo". (-10006)

• The -c and -l options should result in a fatal error (dieSyntax) when targeting Ghostty, due to non-support; an attempt to use the unsupported -s option - which in your code currently yields a warning - should also yield a fatal error, for consistency with how existing non-supported options are treated.

  • The source-code comments in your code suggest that -c is supported, but it currently yields 321:334: syntax error: Expected “timeout” or “transaction” but found identifier. (-2741) - if there is a way to make -c work, that's preferable.

• Re --help text:

  • It doesn't note that -g and -G are also supported in Ghostty.

• Re --man text:

  • It hasn't been updated to reflect Ghostty support, notably with respect to it not being covered by automated tests.
  • The 2 trailing spaces that some lines end in must be retained, as they signal an intentional line break to Markdown rendering.