org: show how to implement Kripke structures

* doc/org/tut51.org: New file.
* doc/org/tut.org, doc/Makefile.am, NEWS: Add it.
* elisp/ob-dot.el: New file, to work around old org-mode versions.
* elisp/README, elisp/Makefile.am: Add it.

elisp/Makefile.am

@@ -1,6 +1,6 @@
 ## -*- coding: utf-8 -*-
-## Copyright (C) 2015 Laboratoire de Recherche et Développement de
-## l'Epita (LRDE).
+## Copyright (C) 2015, 2016 Laboratoire de Recherche et Développement
+## de l'Epita (LRDE).
 ##
 ## This file is part of Spot, a model checking library.
 ##
@@ -17,7 +17,7 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-EXTRA_DIST = hoa-mode.el
+EXTRA_DIST = hoa-mode.el ob-dot.el
 
 GIT = https://gitlab.lrde.epita.fr/spot/emacs-modes/raw/master/
 

elisp/README

@@ -1,3 +1,7 @@
 hoa-mode.el is used when building the documentation for syntax
 highlighting the HOA files displayed in the examples.  But you may
 also want to use it for editing and displaying HOA files.
+
+Old versions of org-mode have a version of ob-dot.el that do not
+correctly deal with backslashs in dot output.  This version fixes
+that.

elisp/ob-dot.el

@@ -0,0 +1,91 @@
+;;; ob-dot.el --- org-babel functions for dot evaluation
+
+;; Copyright (C) 2009-2016 Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; 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 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)
+
+(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
+		t
+		t))))
+     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 (or (assoc :file params)
+			    (error "You need to specify a :file parameter"))))
+	 (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)) "")
+    nil)) ;; signal that output has already been written to 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)
+
+
+
+;;; ob-dot.el ends here