[O] automatically mark DONE when all sub checkboxes are checked

[Peter Salazar]

Hello everyone! Org-mode is amazing. I've totally fallen in love with it. Glad to be joining the community. 

I'm trying to get org-mode to automatically mark DONE when all sub checkboxes are checked. On http://orgmode.org/worg/org-faq.html, I found a function that purports to do this.

I pasted the function into my .emacs file, but now I'm getting an error message when I launch: "Symbol's value as variable is void: org-checkbox-statistics-hook." 

Any thoughts? Thanks in advance! 

;; see http://thread.gmane.org/gmane.emacs.orgmode/42715

(add-to-list 'org-checkbox-statistics-hook (function ndk/checkbox-list-complete))

(defun ndk/checkbox-list-complete ()

  (save-excursion

    (org-back-to-heading t)

    (let ((beg (point)) end)

      (end-of-line)

      (setq end (point))

      (goto-char beg)

      (if (re-search-forward "\\[\\([0-9]*%\\)\\]\\|\\[\\([0-9]*\\)/\\([0-9]*\\)\\]" end t)

            (if (match-end 1)

                (if (equal (match-string 1) "100%")

                    ;; all done - do the state change

                    (org-todo 'done)

                  (org-todo 'todo))

              (if (and (> (match-end 2) (match-beginning 2))

                       (equal (match-string 2) (match-string 3)))

                  (org-todo 'done)

                (org-todo 'todo))))))))

P.S. Not sure if it's relevant, but I'm on OSX using Aquamacs 2.4.