From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jianing Yang <jianingy.yang@gmail.com>
Subject: [Babel] How to find out export format in a babel plugin
Date: Fri, 25 Mar 2011 11:09:46 +0800
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To: emacs-orgmode@gnu.org

Hi, all

I've recently written a babel plugin which does syntax highlighting
using pygment.
However, I have to specify a '-f html' option every time I use it. It looks like


#+begin_src pygment :cmdline -l bash -O linenos -f html
exec 3<&0 # copies STDIN, it prevents 'read' stealing STDIN from '$command'
while read FN; do
  test -e "$FN" || rm -iv "$FN" <&3
done < <(find . $level -type l)
#+end_src

Therefore, my question is that is there a way that a babel plugin can
be aware about the export
format? If there is, not only I can omit the '-f html' but it could
also support for other export format,
like latex, transparently.


The following is my code:

(require 'ob)
(require 'ob-eval)

(defvar org-babel-default-header-args:pygment
  '((:results . "html") (:exports . "results"))
  "Default arguments to use when evaluating a pygment source block.")

(defun org-babel-execute:pygment (body params)
  "Execute a block of Dot code with org-babel.
This function is called by `org-babel-execute-src-block'."
  (let* ((result-params (split-string (or (cdr (assoc :results params)) "")))
     (out-file (cdr (assoc :file params)))
     (cmdline (cdr (assoc :cmdline params)))
     (in-file (org-babel-temp-file "pygment-"))
     (cmd (concat org-pygment-path
             " " cmdline
             " " (org-babel-process-file-name in-file)
  )))
    (unless (file-exists-p org-pygment-path)
      (error "Could not find pygment at %s" org-pygment-path))
    (message (concat "Running Pygment: " cmd))
    (with-temp-file in-file (insert body))
    (org-babel-eval cmd "")
  ))

(defun org-babel-prep-session:pygment (session params)
  "Return an error because Dot does not support sessions."
  (error "Dot does not support sessions"))

(provide 'ob-pygment)


Thanks very much

Regards,
Jianing Yang