cpandiff.pl

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

use LWP::Simple;

my ($pkg, $from, $to) = @ARGV;
$pkg =~ s/::/-/g;
my $content = get("http://search.cpan.org/diff/${pkg}-${from}-${pkg}-${to}.-w.diff")
    or die "oops. no content. try again!\n";
print $content;