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;;; ob-ditaa.el --- org-babel functions for ditaa evaluation
;; Copyright (C) 2009-2011 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; Version: 7.7
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating ditaa source code.
;;
;; This differs from most standard languages in that
;;
;; 1) there is no such thing as a "session" in ditaa
;;
;; 2) we are generally only going to return results of type "file"
;;
;; 3) we are adding the "file" and "cmdline" header arguments
;;
;; 4) there are no variables (at least for now)
;;; Code:
(require 'ob)
(defvar org-babel-default-header-args:ditaa
'((:results . "file") (:exports . "results") (:java . "-Dfile.encoding=UTF-8"))
"Default arguments for evaluating a ditaa source block.")
(defvar org-ditaa-jar-path)
(defun org-babel-execute:ditaa (body params)
"Execute a block of Ditaa 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 ((lambda (el)
(or el
(error
"ditaa code block requires :file header argument")))
(cdr (assoc :file params))))
(cmdline (cdr (assoc :cmdline params)))
(java (cdr (assoc :java params)))
(in-file (org-babel-temp-file "ditaa-"))
(cmd (concat "java " java " -jar "
(shell-quote-argument
(expand-file-name org-ditaa-jar-path))
" " cmdline
" " (org-babel-process-file-name in-file)
" " (org-babel-process-file-name out-file))))
(unless (file-exists-p org-ditaa-jar-path)
(error "Could not find ditaa.jar at %s" org-ditaa-jar-path))
(with-temp-file in-file (insert body))
(message cmd) (shell-command cmd)
nil)) ;; signal that output has already been written to file
(defun org-babel-prep-session:ditaa (session params)
"Return an error because ditaa does not support sessions."
(error "Ditaa does not support sessions"))
(provide 'ob-ditaa)
;;; ob-ditaa.el ends here
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