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path: root/bin/setbright
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#!/bin/bash

set -euo pipefail

current=$(brightnessctl -m info | cut -d, -f4 | tr --delete '%')
case $1 in
    up)
        increment=$(( 5 - ( current % 5 ) ))
        new=$(( current + increment ))
        if [ $new -gt 100 ]; then
            new=100
        fi
        brightnessctl set $new% > /dev/null 2>&1
        echo $new;;
    down)
        increment=$(( ( ( current - 1 ) % 5 ) + 1 ))
        new=$(( current - increment ))
        if [ $new -lt 0 ]; then
            new=0
        fi
        brightnessctl set $new% > /dev/null 2>&1
        echo $new;;
esac