OSC 7 is an escape sequence to notify the terminal emulator of the program's current working directory. There is no formal spec for this. Efforts were made in freedesktop.org's terminal-wg, but these seem stalled.

However, OSC 7 is widely supported.

Here's macOS Sequoia's description of it:

Here's a summary of findings I made of wider adoption (trying to justify why an existing application should print OSC 7):

There also exist the related OSC 1337 proprietary to iTerm2, and OSC 633 proprietary to VSCode, and OSC 9;9 supported on Windows by ConEmu and Windows Terminal.

Not sure if it makes sense to support OSC 1337 and OSC 633, maybe it does make sense to support OSC 9;9 too?

I started work on a PR for just OSC 7, but it seems like to write unit tests charmbracelet/x/ansi also needs to support this, so I'll create this ticket first for referencing.