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+;;; ob-dot.el --- org-babel functions for dot evaluation
+
+;; Copyright (C) 2009, 2010  Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+;; Version: 7.4
+
+;; 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 dot source code.
+;;
+;; For information on dot see http://www.graphviz.org/
+;;
+;; This differs from most standard languages in that
+;;
+;; 1) there is no such thing as a "session" in dot
+;;
+;; 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)
+(require 'ob-eval)
+
+(defvar org-babel-default-header-args:dot
+  '((:results . "file") (:exports . "results"))
+  "Default arguments to use when evaluating a dot source block.")
+
+(defun org-babel-expand-body:dot (body params)
+  "Expand BODY according to PARAMS, return the expanded body."
+  (let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
+    (mapc
+     (lambda (pair)
+       (let ((name (symbol-name (car pair)))
+	     (value (cdr pair)))
+	 (setq body
+	       (replace-regexp-in-string
+		(concat "\$" (regexp-quote name))
+		(if (stringp value) value (format "%S" value))
+		body))))
+     vars)
+    body))
+
+(defun org-babel-execute:dot (body params)
+  "Execute a block of Dot code with org-babel.
+This function is called by `org-babel-execute-src-block'."
+  (let* ((result-params (cdr (assoc :result-params params)))
+	 (out-file (cdr (assoc :file params)))
+	 (cmdline (or (cdr (assoc :cmdline params))
+		      (format "-T%s" (file-name-extension out-file))))
+	 (cmd (or (cdr (assoc :cmd params)) "dot"))
+	 (in-file (org-babel-temp-file "dot-")))
+    (with-temp-file in-file
+      (insert (org-babel-expand-body:dot body params)))
+    (org-babel-eval
+     (concat cmd
+	     " " (org-babel-process-file-name in-file)
+	     " " cmdline
+	     " -o " (org-babel-process-file-name out-file)) "")
+    out-file))
+
+(defun org-babel-prep-session:dot (session params)
+  "Return an error because Dot does not support sessions."
+  (error "Dot does not support sessions"))
+
+(provide 'ob-dot)
+
+;; arch-tag: 817d0516-7b47-4f77-a8b2-2aadd8e4d0e2
+
+;;; ob-dot.el ends here