Get the bounds of the selected frame using an applescript.

get-bounds.el

Feature request 18283 was previously added to Emacs 25 and the master branch in
conjunction with feature request 21415.  In a nutshell, it is now possible to act
upon Emacs (to some degree) using an applescript.

CAVEAT:  Feature request 18283 was implemented primarily to facilitate debugging,
and not to control Emacs per se using applescripts.

(defun get-bounds ()
"Return the bounds of the selected frame."
  (let* ((script (concat "tell front window of application \"Emacs\"\n"
                           "return get bounds\n"
                          "end tell"))
         (command (format "osascript -e '%s'" script)))
    (car (split-string (shell-command-to-string command) "\n"))))