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+;;; ob-plantuml.el --- org-babel functions for plantuml evaluation
+
+;; Copyright (C) 2010-2012  Free Software Foundation, Inc.
+
+;; Author: Zhang Weize
+;; 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/>.
+
+;;; Commentary:
+
+;; Org-Babel support for evaluating plantuml script.
+;;
+;; Inspired by Ian Yang's org-export-blocks-format-plantuml
+;; http://www.emacswiki.org/emacs/org-export-blocks-format-plantuml.el
+
+;;; Requirements:
+
+;; plantuml     | http://plantuml.sourceforge.net/
+;; plantuml.jar | `org-plantuml-jar-path' should point to the jar file
+
+;;; Code:
+(require 'ob)
+(require 'ob-eval)
+
+(defvar org-babel-default-header-args:plantuml
+  '((:results . "file") (:exports . "results"))
+  "Default arguments for evaluating a plantuml source block.")
+
+(defcustom org-plantuml-jar-path nil
+  "Path to the plantuml.jar file."
+  :group 'org-babel
+  :version "24.1"
+  :type 'string)
+
+(defun org-babel-execute:plantuml (body params)
+  "Execute a block of plantuml 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 (or (cdr (assoc :file params))
+		       (error "PlantUML requires a \":file\" header argument")))
+	 (cmdline (cdr (assoc :cmdline params)))
+	 (in-file (org-babel-temp-file "plantuml-"))
+	 (java (or (cdr (assoc :java params)) ""))
+	 (cmd (if (not org-plantuml-jar-path)
+		  (error "`org-plantuml-jar-path' is not set")
+		(concat "java " java " -jar "
+			(shell-quote-argument
+			 (expand-file-name org-plantuml-jar-path))
+			(if (string= (file-name-extension out-file) "svg")
+			    " -tsvg" "")
+			(if (string= (file-name-extension out-file) "eps")
+			    " -teps" "")
+			" -p " cmdline " < "
+			(org-babel-process-file-name in-file)
+			" > "
+			(org-babel-process-file-name out-file)))))
+    (unless (file-exists-p org-plantuml-jar-path)
+      (error "Could not find plantuml.jar at %s" org-plantuml-jar-path))
+    (with-temp-file in-file (insert (concat "@startuml\n" body "\n@enduml")))
+    (message "%s" cmd) (org-babel-eval cmd "")
+    nil)) ;; signal that output has already been written to file
+
+(defun org-babel-prep-session:plantuml (session params)
+  "Return an error because plantuml does not support sessions."
+  (error "Plantuml does not support sessions"))
+
+(provide 'ob-plantuml)
+
+
+
+;;; ob-plantuml.el ends here