spotify-volume.sh

#!/bin/bash

increase=0
if [ $# -lt 1 ] || [ $1 -gt 0 ];then
    increase=1
else
    increase=-1
fi

spotify_at=-1
i=1
for name in `pactl list sink-inputs | grep 'application.name' | cut -d= -f2`;do
    if [[ $name =~ "spotify" ]];then
        spotify_at=$i
    fi
    i=`expr $i + 1`
done

spotify_id=`pactl list sink-inputs | grep 'Sink Input' | cut -d# -f2`

if [ ! $spotify_at -eq -1 ];then
    curr_volume=`pactl list sink-inputs | grep 'Volume' | cut -d'/' -f2 | sed "${spotify_at}!d" | sed 's/%//g'`
    
    new_volume=`expr $curr_volume + \`expr $increase \\\* 10\``
    if [ $new_volume -gt 100 ];then
        new_volume=100
    elif [ $new_volume -lt 0 ];then
        new_volume=0
    fi
    
    pactl set-sink-input-volume $spotify_id "${new_volume}%"
fi