#!/bin/fish

set backlight_device $argv[1]
set action $argv[2]
set dvalue $argv[3]

echo Backlight device: $backlight_device Bumping: $action By: $dvalue
set current_value (cat $backlight_device)

if test $action = up
	echo (math $current_value + $dvalue) > $backlight_device
else if test $action = down
	set newVal (math $current_value - $dvalue)
	if test $newVal -lt 2424
		set newVal 2424
	end
	echo New brightness value: $newVal
	echo $newVal > $backlight_device
else
	exit 2
end