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Re: [O] Problems with capture and lisp code

From: Thomas Holst
Subject: Re: [O] Problems with capture and lisp code
Date: Thu, 21 Jan 2016 15:33:25 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (windows-nt)

Hi Nicolas,

· Nicolas Goaziou <address@hidden> wrote:

> Hello,
> Thomas Holst <address@hidden> writes:
>> for my work flow I would like to set up a capture template based on the
>> ideas described in:
>> http://www.jboecker.de/2010/04/14/general-reference-filing-with-org-mode.html#sec-5
>> The original is based on remember but I want to use capture. The
>> principle is as follows:
>> In the capture template run some lisp code which appends a function to
>> `org-capture-before-finalize-hook' which calls `org-attach-mv' to attach
>> a file.
>> The function run from capture template looks like this:
>> #+begin_src emacs-lisp
>> (defun th:filing-install-attach-mv-hook ()
>>   "call this from a capture template to install th:filing-attach-mv-hook"
>>   (add-hook 'org-capture-before-finalize-hook 'th:filing-attach-mv-hook)
>>   (make-local-variable 'kill-buffer-hook)
>>   (add-hook 'kill-buffer-hook 'th:filing-uninstall-attach-mv-hook)
>>   (add-hook 'org-capture-mode-hook 'th:filing-uninstall-attach-mv-hook)
>>   (message "finalize-hook: %s" org-capture-before-finalize-hook))
>> #+end_src
>> In the messages buffer I can see that at run time of the function
>> `th:filing-attach-mv-hook' is in `org-capture-before-finalize-hook'.
>> Now when I look at `org-capture-before-finalize-hook' in the final
>> capture buffer `th:filing-attach-mv-hook' is not there.
>> The same happens with `kill-buffer-hook'. I also tried
>> `org-capture-prepare-finalize-hook'. Same result.
>> So I am puzzled here :-(. Is there some caching mechanism involved? For
>> the author of the article stated above this worked with remember - but
>> why does it not work with capture.
> Wild guess: capture template is expanded in a temporary buffer, which is
> killed once the process is complete. Therefore, the uninstall hook
> installed in `kill-hook-buffer' removes your function before it is
> actually used.

that's it! your guess is right! Seems that is what is going on!

The function in `kill-buffer-hook' was to remove
`th:filing-attach-mv-hook' when capture buffer was killed with C-c C-k.

Is there another way to execute lisp code when capture buffer is killed
with C-c C-k?

I could alter `kill-buffer-hook' globally, but then if another buffer is
killed while capture buffer still is there the function is also removed.

Hmm ... - I have to think it over maybe I find a solution for that.

Anyway thanks a lot for the pointer!

Mit freundlichen Grüßen / Best regards 

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