#!/usr/bin/env perl
use strict;
use warnings;
use 5.014;

chomp(my $sink=`pacmd stat | grep 'Default sink name' | sed 's/^Default sink name: //'`);

sub get {
    my $volume;

    for (split "\n", `pacmd list-sinks`) {
        chomp;
        next unless /name: <\Q$sink\E>/../^$/;
        if (/^\s+volume: .* ([0-9]+)% /) {
            if (!defined($volume)) {
                $volume = $1;
            }
        }
        elsif (/^\s+muted: yes/) {
            $volume = 'mute';
            last;
        }
    }

    $volume
}

if ($ARGV[0] eq 'get') {
    say get;
}
elsif ($ARGV[0] eq 'up') {
    my $get = get;
    system("pactl set-sink-mute $sink 0");
    if ($get eq 'mute') {
        exit;
    }
    elsif ($get <= 90) {
        system("pactl set-sink-volume $sink +10%");
    }
    elsif ($get < 100) {
        system("pactl set-sink-volume $sink 100%");
    }
}
elsif ($ARGV[0] eq 'down') {
    system("pactl set-sink-volume $sink -10%");
}
elsif ($ARGV[0] eq 'mute') {
    system("pactl set-sink-mute $sink toggle")
}
else {
    die "unknown command '$ARGV[0]'";
}