From mboxrd@z Thu Jan  1 00:00:00 1970
From: tsd@tsdye.com (Thomas S. Dye)
Subject: Re: [babel] eval code only once :eval once
Date: Tue, 10 Apr 2012 08:31:32 -1000
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In-Reply-To: <CAPaq-gOGfQvPrt+sPV9__XDvEKuMmB9xKRJ2dFCp0YdWNg+hww@mail.gmail.com>
	(Torsten Wagner's message of "Tue, 10 Apr 2012 19:08:22 +0900")
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To: Torsten Wagner <torsten.wagner@gmail.com>
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Torsten Wagner <torsten.wagner@gmail.com> writes:

> Hi,
> I started to use lisp (as well as other) code blocks more and more to
> modify my work environment (emacs) for a particular (buffer-based)
> task.
> That is I change some variables, add some stuff etc.
> A real world example is for example the section below
>
> * Set-up							  :nonexport:
> #+source: setup-minted
> #+begin_src emacs-lisp :exports none :results silent
>     (setq org-export-latex-listings 'minted)
>     (setq org-export-latex-custom-lang-environments
>           '(
>            (emacs-lisp "common-lispcode")
>             ))
>     (setq org-export-latex-minted-options
>           '(("frame" "lines")
>             ("fontsize" "\\scriptsize")
>             ("linenos" "")))
>     (setq org-latex-to-pdf-process
>           '("pdflatex -shell-escape -interaction nonstopmode
> -output-directory %o %f"
>             "pdflatex -shell-escape -interaction nonstopmode
> -output-directory %o %f"
>             "pdflatex -shell-escape -interaction nonstopmode
> -output-directory %o %f"))
> #+end_src
>
> This are settings from worg, which I use only during my work on that
> particular file/buffer e.g. to modify the export of the following
> beamer presentation.
> Whenever I load the buffer I jump to set-up and hit C-c C-C to execute
> it once. After that exports will do what I want.
> If I would change the above to :exports results and :results silent I
> would be asked to execute the code block on every export.
> Thanks to the new auto completion feature, I came across :eval and
> wonder if it makes sense to add
> :eval once
> and
> :eval once-query
>
> Which would allow to execute it only once (with query) if not called
> before and otherwise keeps quite.
> That would make *Set-up blocks much more efficient.
> Was thinking why there is no 'no-query' resp. 'always' flag which
> would execute code blocks without query even if asked for it in
> general but that would be somehow against safety measures ;)
>
> Totti
>
>
Aloha Totti,

Will :cache yes do what you want?

Tom

-- 
Thomas S. Dye
http://www.tsdye.com