DONE dot

added support for the dot graphing language
  (http://www.graphviz.org/)

lisp/langs/org-babel-dot.el

@@ -0,0 +1,70 @@
+;;; org-babel-dot.el --- org-babel functions for dot evaluation
+
+;; Copyright (C) 2009 Eric Schulte
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+;; Version: 0.01
+
+;;; License:
+
+;; This program 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, or (at your option)
+;; any later version.
+;;
+;; This program 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; 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 'org-babel)
+
+(org-babel-add-interpreter "dot")
+
+(add-to-list 'org-babel-tangle-langs '("dot" "dot"))
+
+(defvar org-babel-default-header-args:dot '((:results . "file") (:exports . "results"))
+  "Default arguments to use when evaluating a dot source block.")
+
+(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'."
+  (message "executing Dot source code block")
+  (let ((result-params (split-string (or (cdr (assoc :results params)) "")))
+        (out-file (cdr (assoc :file params)))
+        (cmdline (cdr (assoc :cmdline params)))
+        (in-file (make-temp-file "org-babel-dot")))
+    (with-temp-file in-file (insert body))
+    (message (concat "dot " in-file " " cmdline " -o " out-file))
+    (shell-command (concat "dot " in-file " " cmdline " -o " out-file))
+    out-file))
+
+(defun org-babel-prep-session:dot (session params)
+  (error "Dot does not support sessions"))
+
+(provide 'org-babel-dot)
+;;; org-babel-dot.el ends here

org-babel.org

@@ -2141,7 +2141,7 @@ This is currently working only with emacs lisp as in the following
 example in the [[* emacs lisp source reference][emacs lisp source reference]].
 
 
-** TODO Add languages [2/6]
+** TODO Add languages [3/6]
 I'm sure there are many more that aren't listed here.  Please add
 them, and bubble any that you particularly care about up to the top.
 
@@ -2277,9 +2277,21 @@ plot data using 1:2 with lines
 #+resname:
 [[file:session.png][session.png]]
 
-*** TODO dot
+*** DONE dot
 (see [[* file result types][file result types]])
 
+#+srcname: implementing-dot-support
+#+begin_src dot :file test-dot.png :cmdline -Tpng
+digraph data_relationships {
+  "data_requirement" [shape=Mrecord, label="{DataRequirement|description\lformat\l}"]
+  "data_product" [shape=Mrecord, label="{DataProduct|name\lversion\lpoc\lformat\l}"]
+  "data_requirement" -> "data_product"
+}
+#+end_src
+
+#+resname:
+[[file:test-dot.png][test-dot.png]]
+
 *** TODO asymptote
 (see [[* file result types][file result types]])