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+;;; ob-msc.el --- org-babel functions for mscgen evaluation
+
+;; Copyright (C) 2010-2012  Free Software Foundation, Inc.
+
+;; Author: Juan Pechiar
+;; 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:
+;;
+;; This software provides EMACS org-babel export support for message
+;; sequence charts.  The mscgen utility is used for processing the
+;; sequence definition, and must therefore be installed in the system.
+;;
+;; Mscgen is available and documented at
+;; http://www.mcternan.me.uk/mscgen/index.html
+;;
+;; This code is directly inspired by Eric Schulte's ob-dot.el
+;;
+;; Example:
+;;
+;; #+begin_src mscgen :file example.png
+;; msc {
+;;  A,B;
+;;  A -> B [ label = "send message" ];
+;;  A <- B [ label = "get answer" ];
+;; }
+;; #+end_src
+;;
+;; Header for alternative file type:
+;;
+;; #+begin_src mscgen :file ex2.svg :filetype svg
+
+;; This differs from most standard languages in that
+;;
+;; 1) there is no such thing as a "session" in mscgen
+;; 2) we are generally only going to return results of type "file"
+;; 3) we are adding the "file" and "filetype" header arguments
+;; 4) there are no variables
+
+;;; Code:
+(require 'ob)
+(require 'ob-eval)
+
+(defvar org-babel-default-header-args:mscgen
+  '((:results . "file") (:exports . "results"))
+  "Default arguments to use when evaluating a mscgen source block.")
+
+(defun org-babel-execute:mscgen (body params)
+  "Execute a block of Mscgen code with Babel.
+This function is called by `org-babel-execute-src-block'.
+Default filetype is png.  Modify by setting :filetype parameter to
+mscgen supported formats."
+  (let* ((out-file (or (cdr (assoc :file params)) "output.png" ))
+         (filetype (or (cdr (assoc :filetype params)) "png" )))
+    (unless (cdr (assoc :file params))
+      (error "
+ERROR: no output file specified.  Add \":file name.png\" to the src header"))
+    (org-babel-eval (concat "mscgen -T " filetype " -o " out-file) body)
+    nil)) ;; signal that output has already been written to file
+
+(defun org-babel-prep-session:mscgen (session params)
+  "Raise an error because Mscgen doesn't support sessions."
+  (error "Mscgen does not support sessions"))
+
+(provide 'ob-mscgen)
+
+
+
+;;; ob-msc.el ends here