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path: root/.config/swayrbar/scripts/brightness-status
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#!/usr/bin/env sh

brightness_path=/sys/class/backlight/*/brightness
brightness_max_path=/sys/class/backlight/*/max_brightness

if [ -f "${brightness_path}" ]
then
	brightness="$(cat $brightness_path)"
fi

if [ -f "${brightness_max_path}" ]
then
	brightness_max="$(cat /sys/class/backlight/*/max_brightness)"
fi

if [ -n "${brightness}" ] && [ -n "${brightness_max}" ]
then
	level=$(echo "scale=2; $brightness / $brightness_max * 100" | bc)

	printf "  "
	printf "%.0f\n" $level
fi