#!/usr/bin/env clopper-ob-bash
##
# Change brightness and show a notification

multiply-by-10-and-strip-decimals() {
    declare number="$1"
    bc <<<"10 * $number" | sed 's/\..*$//g'
}

current-brightness() {
    xrandr --current --verbose | grep -Pom 1 '(?<=Brightness: ).*'
}

current-output() {
    xrandr --query | grep -Po '^.*(?= connected)'
}

set-brightness() {
    declare output="$1" brightness="$2"
    xrandr --output "$output" --brightness "$brightness"
}

notify-brightness() {
    notify-send.sh -i "$(icon brightness)" \
	--replace-file=$HOME/.cache/clopper-ob/brightness.id \
	"    $(bar $((2 * $(multiply-by-10-and-strip-decimals $(current-brightness)))))"
}

increase-brightness() {
    if [[ $(multiply-by-10-and-strip-decimals $(current-brightness)) -ge 12 ]]; then
	return 0
    fi

    set-brightness "$(current-output)"  "$(bc <<<"$(current-brightness) + 0.1")"
}

decrease-brightness() {
    set-brightness "$(current-output)"  "$(bc <<<"$(current-brightness) - 0.1")"
}    

if [[ $1 == '+' ]]; then
    increase-brightness
elif [[ $1 == '-' ]]; then
    decrease-brightness
fi

notify-brightness