Re: time-warping - retroactively marking DONE?

[Adam Spiers]

Three years later, I finally tried this:

On Wed, 8 Jul 2020 at 05:53, Kyle Meyer <kyle@kyleam.com> wrote:
> Adam Spiers writes:
> > I'm looking for a way to retroactively mark a task as having been done
> > at a previous time/date.  I know that I can just change the keyword to
> > DONE and then edit the timestamp, but this is tedious when it's a
> > repeating event, e.g.:
> [...]
>
> I'm not aware of any built-in support for this.
>
> > If this is not currently possible, would it make sense to write a
> > wrapper around `org-todo', e.g. `org-todo-timewarp' or
> > `org-retroactive-todo', which interactively prompts for a timestamp
> > before invoking `org-todo'?
>
> I think this is the easiest approach, though I'm not sure such a wrapper
> needs to live in Org proper.  Here's a snippet from a recent thread [*]
> that should get you most of the way there:
>
>     (defun my-org-todo-time-machine ()
>       (interactive)
>       (cl-letf (((symbol-function 'current-time)
>                  (lambda ()
>                    (apply #'encode-time (org-parse-time-string
>                                          "2019-11-27 Mi 16:44")))))
>         (call-interactively #'org-todo)))
>
>
> [*] 
> https://orgmode.org/list/875zj42rpx.fsf@passepartout.tim-landscheidt.de/T/#u

I made it read a time interactively:

    (defun as-org-todo-time-machine (arg)
      (interactive "P")
      (let ((fake-time
             (apply #'encode-time (org-parse-time-string
                                   (org-read-date)
                                   ))))
        (cl-letf (((symbol-function 'current-time)
                   (lambda () fake-time)))
          (call-interactively #'org-todo))))

It almost works perfectly, although monkey-patching current-time doesn't affect
the code in org-auto-repeat-maybe which sets LAST_REPEAT, since that uses
the built-in format-time-string:

    (org-entry-put nil "LAST_REPEAT" (format-time-string
      (org-time-stamp-format t t))))

I found that adding (current-time) as the optional time parameter fixed it:

    (org-entry-put nil "LAST_REPEAT" (format-time-string
      (org-time-stamp-format t t)
      (current-time))))

since that allows the monkey-patching to apply there too.  Is it worth
submitting
a patch for this?