How to automatically save all org files after marking a repeating item as DONE in the org agenda?

Question

How to automatically save all org files after marking a repeating item as DONE in the org agenda? I'm using this to automatically save my org buffers after every change to TODO status:

(advice-add 'org-todo :after (η #'org-save-all-org-buffers))

(Where η ignores all arguments and calls the given function.)

This however doesn't work for repeating tasks, scheduled like this:

SCHEDULED: <2016-04-22 Fri +1d>

The org document is still modified after changing the state from TODO to DONE. I've tried a number of hook variables and methods, all without success.

Answer 1

OK, after some investigation it looks like after calling the org-todo, the Org mode tries to store some sort of a “note” using the org-store-log-note function. So the chain of events is roughly the following:

• org-todo is called.
• The advice runs org-save-all-org-buffers without problems, everything gets saved.
• If it's a repeating task, org-store-log-note gets called, which edits the org file again leaving the buffer in a modified state.

Knowing that, the solutions is obvious—just add an :after advice to the org-store-log-note function. My current setup is thus:

(advice-add 'org-deadline       :after (η #'org-save-all-org-buffers))
(advice-add 'org-schedule       :after (η #'org-save-all-org-buffers))
(advice-add 'org-store-log-note :after (η #'org-save-all-org-buffers))
(advice-add 'org-todo           :after (η #'org-save-all-org-buffers))

This η thing is just a helper I defined:

(defmacro η (fnc)
  "Return function that ignores its arguments and invokes FNC."
  `(lambda (&rest _rest)
     (funcall ,fnc)))