use Irssi;
use strict;

Irssi::settings_add_int('misc', 'holes_frequency', 30000);
Irssi::settings_add_str('misc', 'holes_separator', "");
my $holes = '';
my $timeout;
my $holes_cmd = << 'HOLES_CMD';
lsof | grep socket | awk '{print $4}' | awk 'BEGIN{FS=":"}{print $2}' | tr -d [] | uniq
HOLES_CMD

sub uniq {
    my %seen;
    grep !$seen{$_}++, @_;
}

sub holes_sub {
    my $result;
    Irssi::timeout_remove($timeout);
    my $output = `$holes_cmd`;
    my $sep = Irssi::settings_get_str('holes_separator');
    my @lines = split /\n/, $output;
    my @lines = uniq(@lines);
    $holes = '';
    foreach my $line (@lines) {
        if ($result == "") {
            $result = $line
        }
        $result = $result.$sep.$line
    }
    $holes= $result;
    $timeout = Irssi::timeout_add_once(Irssi::settings_get_int('holes_frequency'), 'holes_sub' , undef);
}

Irssi::expando_create('holes', sub {
  return $holes;
}, {});

$timeout = Irssi::timeout_add(Irssi::settings_get_int('holes_frequency'), 'holes_sub' , undef);
holes_sub();