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- #!/usr/bin/env bash
- current_rel() {
- brightnessctl i | grep -Po "(?<=\().*?(?=\%)"
- }
- max=$(brightnessctl m)
- factor=3
- brightness_step=$((max * factor / 100 < 1 ? 1 : max * factor / 100))
- icon_low="notification-display-brightness-low"
- icon_high="notification-display-brightness-full"
- current_abs=$(brightnessctl g)
- case $1'' in
- '') ;;
- 'down')
- # if current value <= 3% and absolute value != 1, set brightness to absolute 1
- if [ "$current_abs" -le "$((factor * max / 100))" ] && [ "$current_abs" -gt 0 ] && [ "$current_abs" -ne 1 ]; then
- brightnessctl s 1
- icon=$icon_low
- else
- brightnessctl s $(("$current_abs" - "$brightness_step"))
- icon=$icon_low
- fi
- ;;
- 'up')
- brightnessctl s $(("$current_abs" + "$brightness_step"))
- icon=$icon_high
- ;;
- esac
- brightness_percentage=$(current_rel)
- notify-send -i "$icon" "Brightness Level" "Backlight is at $brightness_percentage%"
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