Life is such an ephemeral thing. When you really think about it, the time spent on the planet we are destroying day after day is not that much, especially compared to the entire history of humankind. Luckily enough, I can allow myself to indulge in thoughts about life and time. I tend to avoid laziness as much as possible, saving spare time for gratifying leisure: morning runs and basic workout, books, cinema, collecting vinyls, occasional cooking. I like to think of myself as someone who is not set on a predictable path for the rest of his life.

Lassi Kortela’s memento-mori has recently appeared on MELPA. It’s a small package which aims to display your age in the mode-line. The age is displayed with two decimals and it gets updated after a few days once you turned on memento-mori-mode. Thus you have a reminder of how long you have been on Earth, a somehow inspirational indicator to question the time at your disposal. We are entering philosophical worlds here.

However, I don’t like having too much stuff in my mode-line. I want it simple and with only the information I need. That’s why I use minions to hide all the minor-modes. But I can still use memento-mori to display a message on Emacs startup.

(defun mu-display-memento-mori ()
"Display my current age by leveraging memento-mori-age-string'."
(interactive)
(let ((first-name (car (s-split-words user-full-name)))
(age (s-trim memento-mori-age-string))
(msg "%s, you are %s, don't waste your time!"))
(run-with-timer 2 nil
(lambda ()
(message msg first-name age)
(run-with-timer 3 nil
(lambda ()
(message nil)))))))


I am using s facilities to manipulate strings, but more importantly the trick is using run-with-timer as explained on this answer on Emacs.StackExchange. After two seconds, the message is shown, and three seconds after being visible it will disappear.

Provided you set memento-mori-birth-date and activate memento-mori-mode, adding the function to after-init-hook does the rest.

Note that you need to activate Lexical Binding in your init file to use mu-display-memento-mori`1.

## Notes

1. Thanks to Martin Buchmann for pointing this out.