Invoke mac notifier to display a message

mac-notify.el

(defun mac-notify (&optional content title)
  "Invoke mac notifier to display a message
using terminal-notifier(https://github.com/alloy/terminal-notifier)
brew install terminal-notifier "
  (let ((title (or title "Emacs"))
        (content (or content "No Content")))

    (call-process-shell-command
     (format "terminal-notifier -title '%s' -message '%s'"
             title
             content))))