#!/usr/bin/env bash

set -euo pipefail

if [ "$1" = "up" ]; then
    upDown="+$2%"
else
    upDown="$2%-"
fi

newBrightness="$(brightnessctl -m set "$upDown" | cut -d, -f4)"
notify-send -u low \
    -h string:x-canonical-private-synchronous:change-backlight \
    -h "int:value:${newBrightness/\%/}" \
    -- "Set brightness to $newBrightness"