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+;;; org-babel-ditaa.el --- org-babel functions for ditaa evaluation
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+
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+;; Copyright (C) 2009 Eric Schulte
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+
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+;; Author: Eric Schulte
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+;; Keywords: literate programming, reproducible research
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+;; Homepage: http://orgmode.org
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+;; Version: 0.01
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+
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+;;; License:
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+
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+;; This program is free software; you can redistribute it and/or modify
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+;; it under the terms of the GNU General Public License as published by
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+;; the Free Software Foundation; either version 3, or (at your option)
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+;; any later version.
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+;;
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+;; This program is distributed in the hope that it will be useful,
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+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+;; GNU General Public License for more details.
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+;;
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+;; You should have received a copy of the GNU General Public License
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+;; along with GNU Emacs; see the file COPYING. If not, write to the
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+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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+;; Boston, MA 02110-1301, USA.
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+
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+;;; Commentary:
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+
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+;; Org-Babel support for evaluating ditaa source code.
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+;;
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+;; This differs from most standard languages in that
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+;;
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+;; 1) there is no such thing as a "session" in ditaa
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+;;
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+;; 2) we are generally only going to return results of type "file"
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+;;
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+;; 3) we are adding the "file" and "cmdline" header arguments
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+;;
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+;; 4) there are no variables (at least for now)
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+
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+;;; Code:
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+(require 'org-babel)
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+
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+(org-babel-add-interpreter "ditaa")
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+
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+(add-to-list 'org-babel-tangle-langs '("ditaa" "ditaa"))
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+
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+(defun org-babel-execute:ditaa (body params)
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+ "Execute a block of Ditaa code with org-babel. This function is
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+called by `org-babel-execute-src-block'."
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+ (message "executing Ditaa source code block")
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+ (let ((result-params (split-string (or (cdr (assoc :results params)) "")))
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+ (out-file (cdr (assoc :file params)))
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+ (cmdline (cdr (assoc :cmdline params)))
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+ (in-file (make-temp-file "org-babel-ditaa")))
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+ (unless (file-exists-p org-ditaa-jar-path)
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+ (error (format "Could not find ditaa.jar at %s" org-ditaa-jar-path)))
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+ (with-temp-file in-file (insert body))
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+ (message (concat "java -jar " org-ditaa-jar-path " " cmdline " " in-file " " out-file))
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+ (shell-command (concat "java -jar " org-ditaa-jar-path " " cmdline " " in-file " " out-file))
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+ out-file))
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+
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+(defun org-babel-prep-session:ditaa (session params)
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+ (error "Ditaa does not support sessions"))
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+
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+(provide 'org-babel-ditaa)
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+;;; org-babel-ditaa.el ends here
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Eric Schulte