configs/arch-config/scripts/dunst/dunst-backlight.sh

#!/usr/bin/env bash

# You can call this script like this:
# $./dunst-backlight.sh up
# $./dunst-backlight.sh down

get_light() {
    #xbacklight -get | cut -f1 -d"."
    xbacklight -get
}

send_notification() {
    light=$(get_light)
    # Make the bar with the special character ─ (it's not dash -)
    # https://en.wikipedia.org/wiki/Box-drawing_character
    bar=$(seq -s "─" $(($light / 5)) | sed 's/[0-9]//g')
    # Send the notification
    dunstify -i whitebalance -r 2489 -a backlight-script "$light    $bar    "
}

case $1 in
    up)
        # Increase backlight
        xbacklight -inc 10 >/dev/null
        #xbacklight -inc 10% > /dev/null # legacy xorg-xbacklight
        send_notification
        #backlightraw=$(xbacklight -get)
        #backlight=${backlightraw::-8}
        #xbacklight -set "${backlight}0"
        ;;
    down)
        # Decrease backlight
        xbacklight -dec 10 >/dev/null
        #xbacklight -dec 9% > /dev/null # legacy xorg-xbacklight
        send_notification
        #backlightraw=$(xbacklight -get)
        #backlight=${backlightraw::-8}
        #xbacklight -set "${backlight}0"
        ;;
esac