add uuidgen.el

uuidgen.el

@@ -0,0 +1,42 @@
+;;; uuidgen.el --- generate and insert random UUIDs
+
+;; Copyright (C) 2011  Jonathan Rockway
+
+;; Author: Jonathan Rockway <jon@jrock.us>
+;; Keywords: processes
+
+;; 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 of the License, 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(defun uuidgen (&optional time-p)
+  "When called interactively, insert a UUID at the point.  When called from a program, return the UUID.
+Optional argument TIME-P generates a time-based UUID instead of a random UUID."
+  (interactive "P")
+  (let ((uuid
+         (with-temp-buffer
+           (shell-command
+            (format "uuidgen%s" (if time-p " -t" ""))
+            (current-buffer))
+           (buffer-substring-no-properties (point-min) (line-end-position)))))
+    (if (called-interactively-p)
+        (insert uuid)
+      uuid)))
+
+(provide 'uuidgen)
+;;; uuidgen.el ends here