[PATCH 1/2] Provide function that returns a string with a random (version 4) UUID.

[PATCH 1/2] Provide function that returns a string with a random (version 4) UUID.

[David Maus]

---
 lisp/ChangeLog |    5 +++++
 lisp/org-id.el |   24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 4fb3aac..fafe7db 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 0678161..6175eee 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)) ""))
 
-- 
1.7.1