From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <n.goaziou@gmail.com>
Subject: Re: API problem
Date: Wed, 22 Jan 2014 21:40:36 +0100
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	(Cecil Westerhof's message of "Wed, 22 Jan 2014 21:28:11 +0100")
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To: Cecil Westerhof <cldwesterhof@gmail.com>
Cc: emacs-orgmode@gnu.org

Cecil Westerhof <cldwesterhof@gmail.com> writes:

> I have an org-file wth the folowing:
> - [ ] A (setq struct (org-list-struct))
> - [-] B (org-list-get-checkbox 41 struct)
> - [ ] C (org-list-set-checkbox 41 struct "[X]")
> - [ ] D (org-list-get-checkbox 41 struct)
> - [ ] E (org-list-write-struct struct (org-list-parents-alist struct))
>
> In A I fill the struct.
> B displays "[-]"
> C displays "[X]"
> D displays "[X]", so the struct is correctly updated.
> E gives: #<marker in no buffer>
>
> What is going wrong here?

See `org-list-write-struct' docstring. Basically, STRUCT doesn't match
real structure anymore since step C. You need to provide the original
structure as a third argument so `org-list-write-struct' can modify
buffer by set difference.

  (let* ((struct (org-list-struct))
         (old (copy-tree struct)))
    (org-list-set-checkbox (line-beginning-position) struct "[X]")
    (org-list-write-struct struct (org-list-parents-alist struct) old))


Regards,

-- 
Nicolas Goaziou