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dotfiles/bin/.bin/fade

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#!/bin/bash
hostname=`hostname`
max_brightness=`cat /sys/class/backlight/intel_backlight/max_brightness`
brightness=`cat /sys/class/backlight/intel_backlight/brightness`
step=$(( max_brightness / 8 ))
inc=2
low_delta=$(( brightness - step ))
high_delta=$(( brightness + step ))
if ( [ $1 = 'down' ] && [ $low_delta -ge $step ] ) || ( [ $1 = 'up' ] && [ $high_delta -le $max_brightness ] )
then
for i in $(seq $step); do
case $1 in
'up')
brightnessctl s +$inc 1> /dev/null
;;
'down')
brightnessctl s $inc- 1> /dev/null
;;
esac
done
else
echo 'Brightness too high. Use `off` parameter to turn backlight off'
fi