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