dotfiles/i3/backlight.sh

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2018-04-03 15:55:41 +02:00
#!/bin/bash
# Don't start a new transition if the previous one isn't done yet
pgrep -u $UID -x xbacklight >/dev/null && exit
# Calculate new target brightness
current_brightness=$(xbacklight -get)
case $1 in
up)
target=$((current_brightness * 15 / 10))
[ $target -ne $current_brightness ] || target=$((target + 1))
;;
down)
target=$((current_brightness * 10 / 15))
[ $target -ne $current_brightness ] || target=$((target - 1))
;;
esac
# Boundaries: can't go higher than 100% or lower than 1%
[ $target -le 1 ] && target=1
[ $target -ge 100 ] && target=100
# Smoothly set the new brightness
xbacklight -time 100 -fps 42 -set $target