tmux-specific alert styles

[pataquets]

tmux offers two methods of messaging the user:

• tmux display-message
• tmux display-popup

Both are suitable for using as alert method.
Not sure if I'll make it to code it soon, just dumping the idea. Comments welcome.

[pataquets]

So far, in case anyone might find it useful:

    (alert-define-style 'tmux-message
                        :title    "tmux: display message"
                        :remover  (lambda (info))
                        :notifier (lambda (info)
                                    (async-shell-command
                                     (format
                                      "tmux display-message \"%s - (press any key to close)\""
                                      (plist-get info :message))
                                     )))

Needs set -g display-time 0 setting if you don't want to miss notification while away.
Also, tmux 2.6 does not support display-popup function.