tvl-depot/fun/🕰️/lib.lisp

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Common Lisp
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(defpackage 🕰
(:use :cl)
(:import-from :local-time
:timestamp-subtimezone :*default-timezone* :sec-of)
(:export :))
(in-package :🕰)
(declaim (optimize (safety 3)))
(defparameter *clock-emojis*
(vector #\🕛 #\🕧 ; 00:00 - 00:30
#\🕐 #\🕜 ; 01:00 - 01:30
#\🕑 #\🕝 ; 00:00 - 00:30
#\🕒 #\🕞 ; 00:00 - 00:30
#\🕓 #\🕟 ; 00:00 - 00:30
#\🕔 #\🕠 ; 00:00 - 00:30
#\🕕 #\🕡 ; 00:00 - 00:30
#\🕖 #\🕢 ; 00:00 - 00:30
#\🕗 #\🕣 ; 00:00 - 00:30
#\🕘 #\🕤 ; 00:00 - 00:30
#\🕙 #\🕥 ; 00:00 - 00:30
#\🕚 #\🕦)) ; 11:00 - 11:30
(defun (timestamp &optional (tz *default-timezone*))
"Convert a LOCAL-TIME:TIMESTAMP into the nearest Unicode clock face.
Use TZ (which defaults to LOCAL-TIME:*DEFAULT-TIMEZONE*) to determine
the UTC offset to factor when determining the local clock face."
(let* ((offset (multiple-value-bind (offset-secs _dst _name)
(timestamp-subtimezone timestamp tz)
offset-secs))
(secs (+ (sec-of timestamp) offset)))
(elt *clock-emojis* (mod (round (/ secs 1800)) 24))))