KEYBOARD LED

#!/bin/bash

if [ "$(id -u)" != "0" ]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

function setBrightness {
    su -c 'echo '$1' > '$B
}

function setAll {
    su -c 'echo '$1' > '$L
    su -c 'echo '$1' > '$R
    su -c 'echo '$1' > '$M
}

function getRandomColor {
    colors="111
    100
    010
    001
    101
    110
    011"

    color=($colors)

    num_colors=${#color[*]}

    echo "${color[$((RANDOM%num_colors))]}"
}

L="/sys/devices/platform/clevo_wmi/kbled/left"
M="/sys/devices/platform/clevo_wmi/kbled/middle"
R="/sys/devices/platform/clevo_wmi/kbled/right"
B="/sys/devices/platform/clevo_wmi/kbled/brightness"

LAST=0

while true
do
    VOL=$(parec --device=1 --latency=1 --channels=16 | od -N2 -td2 | head -n1 | cut -d' ' -f2- | tr -d ' ' | perl -pe 's/^-//')
    MUL=$(printf "%.0f" $(echo "$(printf "%.0f" $(echo "($VOL/16000.0)*10" | bc -l)) * 1.0" | bc))

    if [ "$MUL" == "0" ];
    then
        MUL=1
    fi

    TOOLARGE=$(echo "10 < $MUL" | bc)
    if [ "$TOOLARGE" == "1" ];
    then
        MUL=10
    fi

    EQUAL=$(echo "$MUL==$LAST" | bc)

    if [ "$EQUAL" == "0" ];
    then
        echo $MUL

        setBrightness $MUL &

        LARGER=$(echo "7 < $MUL" | bc)

        if [ "$LARGER" == "1" ];
        then
            PREVPF=$(echo "7     < $LAST" | bc)
            if [ "$PREVPF" == "0" ];
            then
                C=$(getRandomColor)

                setAll "$C" &

                sudo k "$C" "$C" "$C" &
            fi
        fi

        LAST=$MUL
    fi
done