Add escape codes for shell integration (OSC 133)

[ybc37]

It seems to get more common for terminal emulators/multiplexers [1] to have support for shell integration, e.g. having shortcuts to jump from prompt to prompt. This requires that the shell prompt to print some escape codes, see:

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

It would be great to have pure print those escape codes so it's possible to use these features. Or is there an easy way to print those codes via pure's configuration?

(There is a separate fish plugin, which adds those codes: https://github.com/acomagu/fish-osc133. Still it would be great to have it in the prompt and not rely on another plugin.)

[1]

• tmux has next-prompt/previous-prompt to go to OSC 133 command output
• foot
• kitty
• wezterm
• konsole
• Windows Terminal
• ...I guess there are more :)