From: Vincent Beffara <vbeffara@ens-lyon.fr>
To: emacs-orgmode@gnu.org
Subject: Re: Babel, Python and UTF-8
Date: Fri, 03 Dec 2010 16:43:23 +0100 [thread overview]
Message-ID: <m2mxomyi90.fsf@ens-lyon.fr> (raw)
In-Reply-To: 8739qf2ade.fsf@gmail.com
Hi,
>> (and it would be excellent to allow for a code block as a preamble,
>> instead of a string in the header or as an alternative, because
>> preambles once they are allowed tend to grow uncontrollably ;->)
>
> This is currently possible using the `sbe' function. Arbitrary emacs
> lisp can be placed inside of header arguments, and the `sbe' take the
> name of a code block and returns its result.
Very cool ! That does all I want, thanks for the info. For multi-line it
is a bit heavy to write, with lots of \n and preamble .= "lskjd", but I
can live with that. Unless there is a way already to write something
like this ?
--8<---------------cut here---------------start------------->8---
#+source: my-preamble
#+begin_src python :return preamble
# -*- coding: utf-8 -*-"
import os,sys,whatever
#+end_src
#+begin_src python :preamble (org-babel-get-and-expand-source-code-body my-preamble) :return s
s = "é"
#+end_src
--8<---------------cut here---------------end--------------->8---
There is org-babel-get-src-block-info but it looks at the block around
(point), not by name ... so I guess it would not be too hard to write
the extraction method, but it might be somewhere in the code already.
>> One naive question : why is the code path different for tangling and
>> evaluation ? One would think that a natural way for evaluation would be
>> to tangle the current block (plus included noweb stuff etc) into a
>> temporary file and eval that file ... and that would enable shebang for
>> evaluation as well. There must be something I am missing here.
>
> Tangling works for *any* programming language, even those which have yet
> to be created and have no explicit Emacs or Org-mode support, this is
> because on tangling the code block is simply treated as text.
As far as I understood from testing, tangling does adapt to the language
(at least to implement :var in a suitable way), so I was under the
impression that evaluating could be implemented as some kind of wrapping
around the tangled output - and obviously the wrapping would have to be
language-specific even if for the most part the tanglong is not.
I am just discovering all of this, sorry if I have horrible
misconceptions about the thing ...
Regards,
/v
next prev parent reply other threads:[~2010-12-03 15:43 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-01 23:50 Babel, Python and UTF-8 Vincent Beffara
2010-12-02 1:18 ` Eric Schulte
2010-12-02 1:36 ` Vincent Beffara
2010-12-02 9:11 ` Sébastien Vauban
2010-12-02 19:34 ` Eric Schulte
2010-12-02 20:10 ` Sébastien Vauban
2010-12-03 10:27 ` Vincent Beffara
2010-12-03 11:27 ` Sébastien Vauban
2010-12-03 14:30 ` Eric Schulte
2010-12-03 15:43 ` Vincent Beffara [this message]
2010-12-05 15:30 ` Eric Schulte
2010-12-06 9:42 ` Dan Davison
2010-12-06 11:53 ` Eric S Fraga
2010-12-06 16:42 ` Thomas S. Dye
2010-12-06 18:07 ` Achim Gratz
2010-12-06 18:40 ` Thomas S. Dye
2010-12-06 18:23 ` Dan Davison
2010-12-02 14:29 ` Eric Schulte
2010-12-02 16:12 ` Vincent Beffara
2010-12-02 18:23 ` Dan Davison
2010-12-02 19:36 ` Eric Schulte
2010-12-02 20:05 ` Sébastien Vauban
2010-12-02 16:09 ` Sébastien Vauban
2010-12-02 16:44 ` Vincent Beffara
2010-12-03 14:56 ` Christopher Allan Webber
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