Emacs Lisp: Insert Random UUID
Here's a emacs command to insert a UUID.
(defun xah-insert-random-uuid () "Insert a UUID. This commands calls “uuidgen” on MacOS, Linux, and calls PowelShell on Microsoft Windows. URL `http://xahlee.info/emacs/emacs/elisp_generate_uuid.html' Version 2020-06-04" (interactive) (cond ((string-equal system-type "windows-nt") (shell-command "pwsh.exe -Command [guid]::NewGuid().toString()" t)) ((string-equal system-type "darwin") ; Mac (shell-command "uuidgen" t)) ((string-equal system-type "gnu/linux") (shell-command "uuidgen" t)) (t ;; code here by Christopher Wellons, 2011-11-18. ;; and editted Hideki Saito further to generate all valid variants for "N" in xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx format. (let ((myStr (md5 (format "%s%s%s%s%s%s%s%s%s%s" (user-uid) (emacs-pid) (system-name) (user-full-name) (current-time) (emacs-uptime) (garbage-collect) (buffer-string) (random) (recent-keys))))) (insert (format "%s-%s-4%s-%s%s-%s" (substring myStr 0 8) (substring myStr 8 12) (substring myStr 13 16) (format "%x" (+ 8 (random 4))) (substring myStr 17 20) (substring myStr 20 32)))))))
Thanks to
Christopher Wellons [http://nullprogram.com/]
,
Hideki Saito
http://hideki.hclippr.com/2014/02/02/on-generating-uuid/
.
And
[Yuri Khan https://plus.google.com/+YuriKhan/posts],
Jon Snader
http://irreal.org/blog/
for discussion about UUID.