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#!/bin/sh
help() { echo "brightness - change screen brightness
USAGE: brightness <up|down>"; }
[ "$#" -lt 1 ] && help >&2 && exit 1
brightness="$(brightnessctl --machine-readable | cut -d, -f4 | tr -d %)"
step="$(( brightness / 10 + 1))"
case "$1" in
up) brightnessctl --quiet set +${step}% ;;
down) brightnessctl --quiet set ${step}%- ;;
*) help >&2; exit 1 ;;
esac
brightness="$(brightnessctl --machine-readable | cut -d, -f4)"
if [ -n "$TMUX" ]; then
tmux display "Brightness: $brightness"
exit
fi
notify() { [ -n "$DISPLAY" ] && notify-send -r 45234 "$1" "$2"; }
case "${brightness%\%}" in
[0-9]) notify "💡 Brightness: $brightness" ;;
[1-7][0-9]) notify "🔅 Brightness: $brightness" ;;
[89][0-9]) notify "🔆 Brightness: $brightness" ;;
100) notify "🔆 MAX Brightness: $brightness" ;;
*) notify "brightness" "can't determine brightness"
esac
exit 0
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