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#!/bin/sh
set -eu
BRIGHTNESS_DIFF="$1"
DEVICE="$(cat "$XDG_CONFIG_HOME"/backlight-device)"
HANDLER="/sys/class/backlight/$DEVICE"
OLD_BRIGHTNESS="$(cat "$HANDLER"/brightness)"
MAX_BRIGHTNESS="$(cat "$HANDLER"/max_brightness)"
SUM=$((OLD_BRIGHTNESS + BRIGHTNESS_DIFF))
NEW_BRIGHTNESS="$(clamp -- "$SUM" 0 "$MAX_BRIGHTNESS")"
echo "$NEW_BRIGHTNESS" > "$HANDLER"/brightness || sudo chmod 666 "$HANDLER/brightness"
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