From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Schulte <schulte.eric@gmail.com>
Subject: Re: Passing values by reference to src-blocks
Date: Tue, 24 Jun 2014 23:01:25 -0400
Message-ID: <87vbrpbsii.fsf@gmail.com>
References: <87wqc5srtf.fsf@gmail.com>
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="=-=-="
Return-path: <emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:47743)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <schulte.eric@gmail.com>) id 1WzdV0-0002QC-Jw
	for emacs-orgmode@gnu.org; Tue, 24 Jun 2014 23:03:55 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <schulte.eric@gmail.com>) id 1WzdUu-0003B0-MV
	for emacs-orgmode@gnu.org; Tue, 24 Jun 2014 23:03:50 -0400
Received: from mail-qg0-x22c.google.com ([2607:f8b0:400d:c04::22c]:48041)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <schulte.eric@gmail.com>) id 1WzdUu-0003Au-HE
	for emacs-orgmode@gnu.org; Tue, 24 Jun 2014 23:03:44 -0400
Received: by mail-qg0-f44.google.com with SMTP id j107so1132401qga.17
	for <emacs-orgmode@gnu.org>; Tue, 24 Jun 2014 20:03:43 -0700 (PDT)
List-Id: "General discussions about Org-mode." <emacs-orgmode.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-orgmode>,
	<mailto:emacs-orgmode-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/emacs-orgmode>
List-Post: <mailto:emacs-orgmode@gnu.org>
List-Help: <mailto:emacs-orgmode-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-orgmode>,
	<mailto:emacs-orgmode-request@gnu.org?subject=subscribe>
Errors-To: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org
Sender: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org
To: Thorsten Jolitz <tjolitz@gmail.com>
Cc: emacs-orgmode@gnu.org

--=-=-=
Content-Type: text/plain

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):
>

I think everything is doing what it is supposed to from an Org-mode
perspective, see below (with different functions).


--=-=-=
Content-Type: text/x-org
Content-Disposition: inline; filename=example.org

#+name: plus-foo
#+header: :var buf-file=(buffer-file-name)
#+begin_src emacs-lisp
(concat buf-file "+foo")
#+end_src

#+RESULTS: plus-foo
: /tmp/example.org+foo

#+name: project-name
#+header: :exports none
#+header: :var root-dir=plus-foo(buf-file=(buffer-file-name))
#+begin_src emacs-lisp
(concat root-dir "+bar")
#+end_src

#+RESULTS: project-name
: /tmp/example.org+foo+bar

--=-=-=
Content-Type: text/plain


>
> ,----
> | #+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 is to be expected.  The two blocks above compose to something like

    #+begin_src emacs-lisp
      (file-name-nondirectory
       (file-name-directory
        (directory-file-name
         (file-name-directory
          (buffer-file-name)))))
    #+end_src

Calling `file-name-nondirectory' on the results of `file-name-directory'
seems like it should give you an empty string.

Best,

-- 
Eric Schulte
https://cs.unm.edu/~eschulte
PGP: 0x614CA05D (see https://u.fsf.org/yw)

--=-=-=--