Because of various personal issues I stopped using IRC a while ago. Once in a while I am still joinng the #perl6 channel on, when I have an urgent question, but usually I have enough other distractions.
As I publish articles about Perl 6, once in a while people mention my name, or paste a link to my web site. I don't have time to follow the channel, but I'd like to know when something related to my work is mentioned.
Or just smile I was mentioned on ze Internets!
Luckily Moritz Lenz runs an IRC bot that creates beautiful logs of various IRC channels. Including that of Perl 6.
We are going to write a script that downloads the page containing today's log and check if certain strings were mentioned. If they were, we can dispatch an e-mail.
Thanks to the LWP::Simple module of Cosimo Streppone, this is a simple task.
(Check here how to install Perl 6 modules.)
use v6;
use LWP::Simple;
sub MAIN($day = 0) {
my $d = Date.today() - $day;
say $d;
my @strings = <szabgab maven>;
my $html = LWP::Simple.get('irclog.perlgeek.de/perl6/' ~ $d);
if @strings.grep(-> $p { $html ~~ m:i/$p/ }) {
say 'found';
my @rows = split /\n/, $html;
say @rows.elems;
for @strings -> $s {
for @rows.grep({ m:i/$s/ }) -> $r {
say "$s -- $r";
}
}
}
}
Checking out the web site of the Perl 6 IRC logs, you will see that every day has its own page. The name of the page is built from the date in YYYY-MM-DD format.
How can we get that?
Perl 6 has a Date class which has a constructor called today It returns a Date object, which happens to be in that exact format, when stringified. So generating of today's URL is just a matter of
my $d = Date.today(); my $url = 'irclog.perlgeek.de/perl6/' ~ $d;
As I wanted to be able to check earlier dates as well, I let the MAIN subroutine define a command line argument for $day. That should represent the number of days in the past. It defaults to 0, which means today.
LWP::Simple.get() download the content of a page and we assign it to the $html variable.
As we allow for multiple strings to look for we use grep to check the original HTML with each one of the expected strings. The m:i prefix makes our regex to be case insensitive.
@strings.grep(-> $p { $html ~~ m:i/$p/ })
Then we split the html to work on rows and print out the rows that have any of the strings we are monitoring.
A better approach would be to parse the HTML and check the strings in the right places, but for now this works well enough.
Sending e-mail was left as an exercise to you.
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Published on 2012-09-21