#!/usr/bin/perl
# Copyright (C) 2009, 2012  Alex Schroeder <alex@gnu.org>
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.

use CGI qw/:standard/;
use CGI::Carp qw(fatalsToBrowser);
use LWP::UserAgent;
use XML::RSS;

if (not param('feed')) {
  print header(),
    start_html('Description Stripping'),
    h1('Description Stripping'),
    p('Removes the description of an article if it matches the title. This is most useful for Twitter and other microblogging services.'),
    p('Example input:', code('http://api.twitter.com/1/statuses/user_timeline.rss?screen_name=kensanata')),
    start_form(-method=>'GET'),
    p('Feed: ', textfield('feed', '', 40), checkbox('Strip username'),
      submit()),
    end_form(),
    end_html();
  exit;
}

$ua = LWP::UserAgent->new;
$request = HTTP::Request->new('GET', param('feed'));
$response = $ua->request($request);
$data = $response->content;
exit unless $data;

print header(-type=>$response->content_type);

$rss = new XML::RSS;
$rss->parse($data);

foreach my $i (@{$rss->{items}}) {
  $i->{description} = undef if $i->{description} eq $i->{title};
  $i->{title} =~ s/^.*?: // if param('Strip username');
}

print $rss->as_string;