From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: shorter syntax for both latex and html export of a figure
Date: Mon, 7 Mar 2016 08:34:36 -0800
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To: Alan Schmitt <alan.schmitt@polytechnique.org>
Cc: emacs-orgmode <emacs-orgmode@gnu.org>

On Mon, 7 Mar 2016, Alan Schmitt wrote:

> Hello,
>
> I'm trying to adapt the example that allows to export a figure both to
> tikz and to png so that I don't have to manually add all the header
> lines.
>

Maybe this gets you a step closer

#+begin_src emacs-lisp :results silent
     (defmacro by-backend (&rest body)
       `(case (org-bound-and-true-p org-export-current-backend)
 	 ,@body))

     (org-babel-do-load-languages
      'org-babel-load-languages
      '((latex . t)))

     (defalias 'org-babel-execute:tikz 'org-babel-execute:latex)
     (defalias 'org-babel-expand-body:tikz 'org-babel-expand-body:latex)

     (add-to-list 'org-src-lang-modes '("tikz" . latex))

   (defvar org-babel-default-header-args:tikz
     '((:imagemagick . "yes")
       (:iminoptions . "-density 600")
       (:imoutoptions . "-geometry 800")
       (:results . "file raw")
       (:fit . "yes")
       (:headers . "(\\usepackage{tikz})")
       (:exports . "results")))
#+end_src


When I run your tikz src block  interactively I get two files created. Not 
sure why and I haven't time to edebug step thru the code. But maybe you 
can handle that bit.

HTH,

Chuck