backlight

#!/bin/env bash

function _help() {
    echo "Usage: $(basename "$0") COMMAND VALUE [image]
    
    Simple script to manage cases in which when actual brightness value is set in a value between 0 and 10
    the it seams to be multiplied with no reason leading to 10% be equals to 100% and 11% (the next step) is effectively dark.

COMMANDS:
    up      Increase brightness level
    down    Decrease brightness level
    
VALUE:
    This value is parsed by brightnessctl, possible values are integers or perentage
    
    Example:
        $(basename "$0") up 10
        $(basename "$0") down 10%
        
IMAGE:
    This represent the full path to the image to use in notifications, this is optional.
    By default the first element containing the name \"brightness.svg\" enumerating /usr/share/icons/ is selected.
    
    Example:
        $(basename "$0") up 10 ~/.icons/my-brightness-icon.svg"
}

function notify() {
    notify-send -t 1000 -h string:x-canonical-private-synchronous:sys-notify -u low \
        -i "$IMAGE" \
        "Backlight $ACTION" "Brightness : $(brightnessctl g)"
}

function handle() {

    local ACTION="$1"
    local QUANTITY="$2"
    local IMAGE=${3:-$(find /usr/share/icons/ -type f -iname '*brightness*.svg' | head -1)}

    case "$ACTION" in
    up)
        brightnessctl -q set +"$QUANTITY"
        notify
        ;;
    down)
        if [[ $(brightnessctl g) -ge 15 ]]; then
            brightnessctl -q set "$QUANTITY"-
            notify
        else
            :
        fi
        ;;
    *)
        _help
        ;;
    esac
}

handle "$@"