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#!/bin/sh
# Check darkness by computing luminance of the current terminal.
trap "stty $(stty -g)" EXIT
stty raw -echo min 0 time 0
printf '\e]11;?\e\\'
sleep 0.01
awk -v FS='' -v hex=123456789abcdef '{
r = (16 * index(hex, $10) + index(hex, $11)) / 255
g = (16 * index(hex, $15) + index(hex, $16)) / 255
b = (16 * index(hex, $20) + index(hex, $21)) / 255
# print 0.33 * r + 0.5 * g + 0.16 * b
exit (0.33 * r + 0.5 * g + 0.16 * b > 0.5)
}'
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