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#!/bin/bash
# A script to manage screen brightness on my machine
# Depends on: bash, brightnessctl, libnotify
# By David Penkowoj, 2024-09-16
memfile="/tmp/$(whoami)-brightness.memtxt"
monitor_id="amdgpu_bl2"
bctl() {
brightnessctl --device="$monitor_id" "$@"
}
notify_brightness() {
current="$(brightness get)"
max="$(bctl m)"
notify-send -u low -r "110" "Screen brightness: $(( current * 100 / max ))%"
}
case "$1" in
"up")
bctl set +5%
notify_brightness
;;
"down")
bctl set 5-%
notify_brightness
;;
"get")
printf "%s\n" "$(bctl | grep -Eo "[0-9]+" | head -n 2 | tail -n 1)"
;;
*)
printf "[ Error ] Usage: brightness [up|down|get]"
exit 1
;;
esac
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