Support notify on macOS with the alert package

[gsingh93]

As far as I know the notifications package doesn't support macOS. alert is an alternative that does work on macOS and other platforms. Would you accept a PR that allows customizing whether notifications or alert is used depending on some configuration option (i.e. (setq hammy-use-alert t), feel free to suggest a better name)?

This isn't really preventing me from using the package, as I can just use some other lisp code to work around this, but it would be nice to use the built-in notify pseudo-function.

I don't think we would need to add alert as a dependency, as this option would be off by default, but open to your thoughts about this.

[alphapapa]

Hi,

Generally I'd prefer not to add options for integrations with specific other packages. In this case, if notifications-notify is truly useless for a Mac user, it would seem appropriate for that user to do something like:

(define-advice notifications-notify
    (:override (&rest params) using-alert)
  (alert (plist-get params :body)
         :title (plist-get params :title)))

That would solve the problem for any library that calls notifications-notify, wouldn't it? If so, it might be appropriate to propose an addition to alert that would implement advice like that as a minor mode that Mac users could activate.

What do you think? Thanks.

[gsingh93]

This makes sense to me, I'll open an issue on the alert repo. Thanks!