+;;; ob-ditaa-eps.el --- org-babel functions for ditaa evaluation
+;; Copyright (C) 2009-2012 Free Software Foundation, Inc.
+;; Author: Eric Schulte und Arne Babenhauserheide
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+;; 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/>.
+;; Org-Babel support for evaluating ditaa source code as eps/pdf.
+;; Almost verbatim copy from ob-ditaa, but with ditaa-eps and epstopdf
+;; as intermediate step.
+;; Ditaa 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)
+ '((:results . "file") (:exports . "results") (:java . "-Dfile.encoding=UTF-8"))
+ "Default arguments for evaluating a ditaa source block.")
+(defcustom org-ditaa-eps-jar-path (expand-file-name
+ (file-name-directory (find-library-name "org")))))))
+ "Path to the ditaa-eps jar executable."
+(defun org-babel-execute:ditaa-eps (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)
+ "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-"))
+ (cmd0 (concat "java " java " -jar "
+ (expand-file-name org-ditaa-eps-jar-path))
+ " " (org-babel-process-file-name in-file)
+ " " (org-babel-process-file-name (concat in-file ".eps"))))
+ (cmd1 (concat "epstopdf"
+ " " (org-babel-process-file-name (concat in-file ".eps"))
+ " -o=" (org-babel-process-file-name out-file))))
+ (unless (file-exists-p org-ditaa-eps-jar-path)
+ (error "Could not find ditaa.jar at %s" org-ditaa-eps-jar-path))
+ (with-temp-file in-file (insert body))
+ (message cmd0) (shell-command cmd0)
+ (message cmd1) (shell-command cmd1)
+ nil)) ;; signal that output has already been written to file
+(defun org-babel-prep-session:ditaa-eps (session params)
+ "Return an error because ditaa does not support sessions."
+ (error "Ditaa does not support sessions"))
+(defun ditaa-eps-mode ()
+;;; ob-ditaa-eps.el ends here