From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric S Fraga <ucecesf@ucl.ac.uk>
Subject: Re: [babel] Error with source block and variable on export	- bug?
Date: Fri, 03 Sep 2010 18:51:58 +0100
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To: Eric Schulte <schulte.eric@gmail.com>
Cc: emacs-orgmode <emacs-orgmode@gnu.org>

On Fri, 03 Sep 2010 09:05:24 -0600, "Eric Schulte" <schulte.eric@gmail.com> wrote:
> 
> Rainer M Krug <r.m.krug@gmail.com> writes:
> 
> > On 03/09/10 16:32, Rainer M Krug wrote:
> >> On 03/09/10 15:40, Eric Schulte wrote:
> >>> Hi Rainer,
> >> 
> >>> As part of the export process Org-mode copies the contents of the
> >>> Org-mode file to a temporary buffer in which the business of exportation
> >>> is performed.  This temporary buffer is not associated with any file so
> >>> (buffer-file-name) returns nil, which is causing the problem you are
> >>> experiencing.  I think the best solution would be to replace the call to
> >>> (buffer-file-name) with the actual name of the file, e.g.
> >> 
> >>> #+begin_src sh :var file=(vc-working-revision "~/src/babel-dev/scraps.org") :exports results
> >>>   echo $file Revision
> >>> #+end_src
> >> 
> >> Hi Eric
> >> 
> >> thanks a lot for the clarification - that makes perfect sense. I will do
> >> as suggested.
> >
> > Thanks - it is working now.
> > But it is a little bit awkward to have the file name (incl. path)
> > somewhere in the document - can create some problems when renaming the
> > file or saving it somewhere else).
> > Is it possible to define it as a kind of variable (property?) in the
> > headers of the file and reference it in the org file later?
> >
> 
> Oh,
> 
> I've just remembered that during export Org-mode saves this file-name
> information in the temporary variable `org-current-export-file'.
> 
> So the following will work, even though it relies upon undocumented
> internals of Org-mode which could change at some point.
> 
> #+begin_src sh :var file=(vc-working-revision (or (buffer-file-name) org-current-export-file)) :exports results
>   echo $file Revision
> #+end_src
> 
> Cheers -- Eric

And this works very well with an inline src snippet (tested with git
and RCS).  Very nice!

,----
| * revision control
|   The version of this file is 
|    src_emacs-lisp{(vc-working-revision (or (buffer-file-name) org-current-: export-file))}.
`----

Thanks!