From aa0004004b7f7e38e9169b24bcd32dd17f3c2a22 Mon Sep 17 00:00:00 2001
From: David Maus <dmaus@ictsoc.de>
Date: Sun, 16 May 2010 16:27:33 +0200
Subject: [PATCH] Provide function that returns a string with a random (version
 4) UUID.

---
 lisp/ChangeLog |  5 +++++
 lisp/org-id.el | 24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 4fb3aac20..fafe7dbff 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2010-05-16  David Maus  <dmaus@ictsoc.de>
+
+	* org-id.el (org-id-uuid): New function.  Return string with
+	random (version 4) UUID.
+
 2010-05-15  Carsten Dominik  <carsten.dominik@gmail.com>
 
 	* org-latex.el (org-export-latex-format-image): Add support
diff --git a/lisp/org-id.el b/lisp/org-id.el
index 06781613a..6175eee2c 100644
--- a/lisp/org-id.el
+++ b/lisp/org-id.el
@@ -318,6 +318,30 @@ So a typical ID could look like \"Org:4nd91V40HI\"."
      (t (error "Invalid `org-id-method'")))
     (concat prefix unique)))
 
+(defun org-id-uuid ()
+  "Return string with random (version 4) UUID."
+  (let ((rnd (md5 (format "%s%s%s%s%s%s%s"
+			  (random t)
+			  (current-time)
+			  (user-uid)
+			  (emacs-pid)
+			  (user-full-name)
+			  user-mail-address
+			  (recent-keys)))))
+    (format "%s-%s-4%s-%s%s-%s"
+	    (substring rnd 0 8)
+	    (substring rnd 8 12)
+	    (substring rnd 13 16)
+	    (format "%x"
+		    (logior
+		     #B10000000
+		     (logand
+		      #B10111111
+		      (string-to-number
+		       (substring rnd 16 18) 16))))
+	    (substring rnd 18 20)
+	    (substring rnd 20 32))))
+
 (defun org-id-reverse-string (s)
   (mapconcat 'char-to-string (nreverse (string-to-list s)) ""))
 
-- 
2.11.4.GIT