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#!/usr/bin/env bash
# Craig Jennings <c@cjennings.net>
# DWM convenience script for changing backlight
# depends on xbacklight
increment=10
case $1 in
"max")
sudo xbacklight -set 100%;
;;
"min")
sudo xbacklight -set 5%;
;;
"up")
# get current setting as an int
current=$( printf "%.0f" "$(xbacklight -get)" )
# add the increment
newvalue=$(("$current" + "$increment"))
# don't let the brightness go above 100
[ "$newvalue" -ge 100 ] && newvalue=100;
# set the value
xbacklight -set "$newvalue";
;;
"down")
current=$( printf "%.0f" "$(xbacklight -get)" )
newvalue=$(("$current" - "$increment"))
[ "$newvalue" -le 5 ] && newvalue=5;
xbacklight -set "$newvalue";
;;
esac
newvalue=$( printf "%.0f" "$(xbacklight -get)")
notify-send "backlight" "backlight now set to $newvalue"
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