From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thorsten Jolitz <tjolitz@gmail.com>
Subject: Re: Passing values by reference to src-blocks
Date: Wed, 25 Jun 2014 05:12:31 +0200
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Thorsten Jolitz <tjolitz@gmail.com> writes:

> Hi List, 
>
> this does not work, although I would think it should (at least if there
> is no typo or so):
>
> ,----
> | #+name: project-root
> | #+header: :var buf-file=(buffer-file-name)
> | #+begin_src emacs-lisp
> | (file-name-directory
> |  (directory-file-name
> |   (file-name-directory buf-file)))
> | #+end_src
> `----
>
> #+results: project-root
> : /home/tj/News/drafts/
>
> ,----
> | #+name: project-name
> | #+header: :exports none
> | #+header: :var root-dir=project-root(buf-file=(buffer-file-name))
> | #+begin_src emacs-lisp
> |   (mapconcat
> |    'capitalize
> |    (split-string
> |     (file-name-nondirectory root-dir)
> |     "-" 'OMIT-NULLS)
> |    " ")
> | #+end_src
> `----
>
> #+results: project-name
>
> Wrong usage of :var or limitations of header arguments?

This works

,----
| #+name: project-root
| #+header: :var buf-file=(buffer-file-name)
| #+begin_src emacs-lisp
| (file-name-directory
|  (directory-file-name
|   (file-name-directory buf-file)))
| #+end_src
| 
| #+name: project-name
| #+header: :exports none
| #+header: :var root=project-root
| #+begin_src emacs-lisp
|   (mapconcat
|    'capitalize
|    (split-string
|     (file-name-nondirectory
|     (directory-file-name root))
|     "-" 'OMIT-NULLS)
|    " ")
| #+end_src
`----

so it was just wrong usage ... sorry for the noise

-- 
cheers,
Thorsten