Cricket bot

Scenario:

You like the cricket.
There’s live commentary available on the web, but its not in some kind of nice incremental stream, so using it is a bit fiddly.
You’re in IRC all day long at your desk and on your phone.

Half an hour and some Perl later, this :)

#!/usr/bin/env perl

use 5.016;
use warnings;
use strict;

use AnyEvent;
use AnyEvent::IRC::Client;
use AnyEvent::HTTP;
use HTML::TreeBuilder 5 -weak;
use Digest::SHA1 qw(sha1_hex);

if (@ARGV < 5) {
    say "usage: cricinfobot <host> <port> <nick> <channel> <matchid>";
    exit 1;
}

my ($HOST, $PORT, $NICK, $CHANNEL, $MATCHID) = @ARGV;
my $URL = "http://www.espncricinfo.com/netstorage/$MATCHID.html";

my $c = AnyEvent->condvar;

my $timer;
my $con = new AnyEvent::IRC::Client;

$con->reg_cb(
    registered => sub {
        $con->send_srv(JOIN => $CHANNEL);
    },
    disconnect => sub {
        $c->broadcast;
    },
);

$con->connect ($HOST, $PORT, { nick => $NICK });

my %seen;

my $check = AnyEvent->timer(interval => 15, cb => sub {

    http_get($URL, sub {
        my ($body, $hdr) = @_;

        if ($hdr->{Status} !~ m/^2/) {
            say STDERR "fetch failed: $hdr->{Status}";
            return;
        }

        my $tree = HTML::TreeBuilder->new_from_content($body);

        my %new_seen;

        for my $elem (reverse $tree->look_down(class => "commsText")) {
            my $text = $elem->as_text;
            my $checksum = sha1_hex($text);

            $new_seen{$checksum} = 1;

            $con->send_srv(PRIVMSG => $CHANNEL, $text) if not $seen{$checksum};
        }

        %seen = %new_seen;
    });

});

$c->wait;
$con->disconnect;