shorter syntax for both latex and html export of a figure

[Alan Schmitt <alan.schmitt@polytechnique.org>]

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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.

Here is what I tried:

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#+LATEX_HEADER: \usepackage{tikz}

* Tikz test
Here's a tree, exported to both html and pdf.

#+header: :file (by-backend (latex "tree.tikz") (t "tree.png"))
#+header: :imagemagick yes :iminoptions -density 600 :imoutoptions -geometry 800
#+header: :results file raw
#+header: :fit yes
#+header: :headers '("\\usepackage{tikz}")
#+begin_src latex
  \usetikzlibrary{trees}
  \begin{tikzpicture}
    \node [circle, draw, fill=red!20] at (0,0) {1}
    child { node [circle, draw, fill=blue!30] {2}
      child { node [circle, draw, fill=green!30] {3} }
      child { node [circle, draw, fill=yellow!30] {4} }};
  \end{tikzpicture}
#+end_src

The same, with shorter syntax

#+header: :file (by-backend (latex "tree2.tikz") (t "tree2.png"))
#+begin_src tikz
  \usetikzlibrary{trees}
  \begin{tikzpicture}
    \node [circle, draw, fill=red!20] at (0,0) {1}
    child { node [circle, draw, fill=blue!30] {2}
      child { node [circle, draw, fill=green!30] {3} }
      child { node [circle, draw, fill=yellow!30] {4} }};
  \end{tikzpicture}
#+end_src

* COMMENT evaluate this first
#+begin_src emacs-lisp :results silent
(defmacro by-backend (&rest body)
  `(case 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)

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

(defvar org-babel-default-header-args:tikz
  '((:imagemagick . "yes")
    (:iminoptions . "-density 600")
    (:imoutoptions . "-geometry 300")
    (:results . "file raw")
    (:fit . "yes")
    (:headers . "'(\"\\\\usepackage{tikz}\")")))
#+end_src

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The first part, where all the headers line are there, works great, but
the second source block for a newly defined language tikz (an alias to
latex with some default headers) does not work unfortunately. In the
exported version, I get a minted source block and not a link.

Am I doing something wrong? Is it possible to have a shorter syntax for
these blocks, or do I have to put all the header lines all the time?

Thanks,

Alan

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