At Sat, 19 Jul 2008 08:27:21 -0700,
Carsten Dominik wrote:
>
>
> On Jul 18, 2008, at 7:19 AM, Max Mikhanosha wrote:
>
> > If I press 't' in the agenda buffer and the state change is logged
> > with a note, undo in the agenda buffer only undoes a note line in the
> > org buffer, leaving the item state changed, and now being out of sync
> > with agenda.
> >
> > If there is no note, then undo works fine.
>
>
> Hmmm. yes. This is hard to fix, but I will take a look.
>
I've tried to fix it myself, and yes its non-trivial because one has
to adjust the undo boundary somehow after addinga a note.. After a few
hours of hacking I gave up on that, and instead came up with the
following:
You seem to be playing with (undo-boundary) which records nil in the
buffer-undo-list, which makes (undo-more) stop.
It seems that one can use arbitrary markers in the undo list, not just
nil. The (primitive-undo) function ignores anything in the undo list
that is not a consp.
Therefore the following code that implements named/storable undo-boundaries
seems to work, you can test it in scratch buffer
(defun make-undo-checkpoint ()
(let ((checkpoint (gensym)))
(push checkpoint buffer-undo-list)
checkpoint))
(defun do-undo-until-checkpoint (checkpoint)
(let ((ptr buffer-undo-list) prev found rest-of-undo)
(while (and ptr (not found))
(if (not (eq (car ptr) checkpoint))
(setq prev ptr ptr (cdr ptr))
(setq found t)))
(when found
;; rest of undo list after our tag
(setq rest-of-undo (cdr ptr))
;; split the undo list by putting NIL at the place of
;; our tag
(if (not prev)
(setq buffer-undo-list nil)) ;; our tag was the 1st element
(setcdr prev nil) ;; previous elemen is now last
(undo-start)
(while (listp pending-undo-list)
(undo-more 1)))))
(defvar checkpoints nil)
(make-variable-buffer-local 'checkpoints)
(defun record-undo-checkpoint (&optional arg)
(interactive)
(push (make-undo-checkpoint) checkpoints))
(defun undo-until-checkpoint (&optional arg)
(interactive)
(do-undo-until-checkpoint (pop checkpoints)))
Now if you do M-x record-undo-checkpoint in the buffer it pushes into
a stack of undo checkpoints. The M-x undo-until-checkpoint does undo
until that checkpoint. The checkpoint itself is a unique gensym.
Would it be possible to use this in the org-agenda undo functionality?
You can simply create an undo checkpoint before doing any agenda
command, and then call (undo-until-checkpoint) and it will undo all
the changes in between regardless of undo boundaries?
Regards,
Max
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