Rainer M Krug <Rainer <at> krugs.de> writes:
>
> Sebastien Vauban <sva-news@...>
> writes:
>
> > Rainer M Krug wrote:
> >> Charles Berry <ccberry@...> writes:
> >>> Rainer M Krug <Rainer <at> krugs.de> writes:
> >>>>
> >>>> when exporting the fillowing org file, I get an endless loop of
> >>>> evaluations.
> >>>>
> >>>> --8<---------------cut here---------------start------------->8---
> >>>> #+PROPERTY: header-args :exports both
> >>>> #+PROPERTY: header-args+ :results output
> >>>> * The bug
> >>>> This file create an (possibly endless?) loop during export
> >>>> * here exports both
> >>>> #+begin_src R
> >>>> cat(13+14)
> >>>> #+end_src
> >>>>
> >>>> * and here only code
> >>>> :PROPERTIES:
> >>>> :header-args+: exports code
> >>>> :END:
> >>>> #+begin_src R
> >>>> paste(13+14)
> >>>> #+end_src
> >>>> --8<---------------cut here---------------end--------------->8---
> >>>
[discussion of problem, diagnostic methods, and cures deleted]
> 1) I thought that header-args is simply a string, but it already seems
> to be a list?
Depends on which `header-args' one is discussing:
1. A property, as in `(org-entry-get (point) "header-args" t)'
2. The value of `(nth 2 (org-babel-get-src-block-info))'
3. The value of an elisp variable like `org-babel-default-header-args'
4. The 4th string matched by `org-babel-src-block-regexp'
5. The first string matched by `org-babel-multi-line-header-regexp'
1, 4 and 5 are strings. 2 and 3 are lists.
>
[more questions deleted]
>
Exactly what happens and when is a long story, involving a bunch of
functions.
You might start by reading `org-babel-get-src-block-info' and
`org-babel-merge-params'.
I think most of what you need to know really is in
(info "(org) Using header arguments")
and
(info "(org) Property syntax")
Just remember that a property called `header-args' is a string until Babel
starts working on it.
> 5) Is there any way in getting, in this function, the same output
> (header-args) as from the code block suggested by Charles:
>
You might try
#+BEGIN_SRC emacs-lisp :results pp
(cons (org-entry-get (point) "header-args" t)
(nth 2 (org-babel-get-src-block-info)))
#+END_SRC
HTH,
Chuck
