osc/notify: add support for OSC-99, kitty desktop notifications

This adds limited support for OSC-99, kitty desktop notifications[^1]. We
support everything defined by the "protocol", except:

* 'a': action to perform on notification activation. Since we don't
  trigger the notification ourselves (over D-Bus), we don't know a)
  which ID the notification got, or b) when it is clicked.
* ... and that's it. Everything else is supported

To be explicit, we *do* support:

* Chunked notifications (d=0|1), allowing the application to append
  data to a notification in chunks, before it's finally displayed.
* Plain UTF-8, or base64-encoded UTF-8 payload (e=0|1).
* Notification identifier (i=xyz).
* Payload type (p=title|body).
* When to honor the notification (o=always|unfocused|invisible), with
  the following quirks:
    - we don't know when the window is invisible, thus it's treated as
      'unfocused'.
    - the foot option 'notify-focus-inhibit' overrides 'always'
* Urgency (u=0|1|2)

[^1]: https://sw.kovidgoyal.net/kitty/desktop-notifications/
This commit is contained in:
Daniel Eklöf 2024-07-19 15:04:28 +02:00
parent 45c7cd3f74
commit b0bf8ca5f7
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10 changed files with 322 additions and 15 deletions

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@ -360,7 +360,7 @@ empty string to be set, but it must be quoted: *KEY=""*)
By default, notifications are *inhibited* if the foot window
has keyboard focus. See _notify-focus-inhibit_.
Default: _notify-send -a ${app-id} -i ${app-id} ${title} ${body}_.
Default: _notify-send -a ${app-id} -i ${app-id} -u ${urgency} ${title} ${body}_.
*notify-focus-inhibit*
Boolean. If enabled, foot will not display notifications if the