From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: Bug: LaTeX source code blocks not exported in Markdown [8.3.1
 (8.3.1-103-g366dc4-elpa @ /home/bitouze/.emacs.d/elpa/org-20150907/)]
Date: Fri, 11 Sep 2015 09:10:24 -0700
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To: =?ISO-8859-15?Q?Denis_Bitouz=E9?= <dbitouze@wanadoo.fr>
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On Fri, 11 Sep 2015, Denis Bitouzé wrote:

>
>
> Remember to cover the basics, that is, what you expected to happen and
> what in fact did happen.  You don't know how to make a good report?  See
>
>     http://orgmode.org/manual/Feedback.html#Feedback
>
> Your bug report will be posted to the Org-mode mailing list.
> ------------------------------------------------------------------------
>
> When exported to Mardown, the following org mode file:
>
> --8<---------------cut here---------------start------------->8---
> * Lisp code
> #+begin_src emacs-lisp
> (some-code)
> #+end_src
>
> * Foo code
> #+BEGIN_SRC foo
> Foo
> #+END_SRC
>
> * \LaTeX code
> #+BEGIN_SRC latex
> latex
> #+END_SRC
>
> (Huh: nothing?)
> --8<---------------cut here---------------end--------------->8---
>
> gives:
>
>  ┌────
>  │ <div id="table-of-contents">
>  │ [...]
>  │ </div>
>  │
>  │ # Lisp code<a id="orgheadline1"></a>
>  │
>  │     (some-code)
>  │
>  │ # Foo code<a id="orgheadline2"></a>
>  │
>  │     Foo
>  │
>  │ # \LaTeX code<a id="orgheadline3"></a>
>  │
>  │ (Huh: nothing?)
>  └────
>
> Expected behavior:
>
>  ┌────
>  │ #+BEGIN_SRC latex
>  │ latex
>  │ #+END_SRC
>  └────
>
> gives:
>
>  ┌────
>  │     latex
>  └────
>

Not a bug.

`org-babel-default-header-args:latex' is

 	'((:results . "latex") (:exports . "results"))

Hence, on export the latex is enclosed in a latex 
export block (#+BEGIN_LATEX ... #+END_LATEX), which markdown (and html) 
will ignore as per

 	(info "(org) results") and
 	(info "(org) Exporting code blocks").

I think you wanted `#+BEGIN_SRC latex :exports code'.

HTH,

Chuck

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