Turn EvolDir categories into RSS feeds

EvolDir-RSSifier.php

<?php
header('Content-Type: application/rss+xml; charset=UTF-8');

$list_name = htmlspecialchars($_GET['lname']);
$list_url = 'http://life.mcmaster.ca/cgi-bin/my_wrap/brian/evoldir/'.$list_name.'/';


$month_num = array ( 
	"Jan" => 1,
	"Feb" => 2,
	"Mar" => 3,
	"Apr" => 4,
	"May" => 5,
	"Jun" => 6,
	"Jul" => 7,
	"Aug" => 8,
	"Sep" => 9,
	"Oct" => 10,
	"Nov" => 11,
	"Dec" => 12
	);

function nl2p($string) {
    $paragraphs = '';

    foreach (explode(PHP_EOL.PHP_EOL, $string) as $block) {
        	$paragraphs .= '<p>' . $block . ' </p>';
    }

    return $paragraphs;
}


$html = file_get_contents($list_url);

$pre_block = explode( '<pre>', $html ); $pre_block = explode( PHP_EOL.'</pre>', $pre_block[1] ); $pre_block = $pre_block[0];

$lines = explode(PHP_EOL, $pre_block); $lines = array_slice($lines, 0, 20);

$prev_post_year = date('Y'); //now
$prev_post_month = date('n'); //now


foreach ($lines as $line) {

	$post_url = 'http://life.mcmaster.ca'.preg_replace('/<a href="(.*)">.*/', '$1', $line);

	$post_title = preg_replace('/<a href=".*">(.*)<\/a>.*/', '$1', $line); $post_title = preg_replace('/\./', ' ', $post_title);

	$post_content = file_get_contents($post_url); $post_content = preg_replace('/[^\PC\s]/u', '', $post_content); $post_content = utf8_encode($post_content);

	$post_time_str = preg_replace('/.*<\/a>\s+\d+ \w+\s+(\w+)\s{1,2}(\d+) (\d\d:\d\d)/', '$1 $2 $3', $line); // Month Day Time
	$post_month = $month_num[explode(' ', $post_time_str )[0]];

	if ($post_month > $prev_post_month) {
		$post_year = $prev_post_year - 1;
	} else {
		$post_year = $prev_post_year;
	}

	$post_pubdate_int =  strtotime($post_time_str . $post_year); 


	$posts[] = array(
		'post_url'     => $post_url,
		'post_title'   => $post_title,
		'post_desc'    => substr($post_content, 0, 300),
		'post_content' => nl2p($post_content),
		'post_pubdate' => date('r', $post_pubdate_int)
		);


	$prev_post_year = $post_year;
	$prev_post_month = $post_month;
}

?>
<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
>

<channel>
	<title><?php echo 'EvolDir: '.$list_name; ?></title>
	<link><?php echo $list_url; ?></link>
	<description><?php echo 'RSS feed for EvolDir: '.$list_name; ?></description>

<?php
// item loop stuff goes here
foreach ($posts as $post) {

	echo "<item>\n";
		echo "<title>";
		echo $post['post_title'];
		echo "</title>\n";
	
		echo "<link>";
		echo $post['post_url'];
		echo "</link>\n";
	
		echo "<description>";
		echo '<![CDATA['. $post['post_desc'] .']]>';
		echo "</description>\n";
	
		echo "<content:encoded>";
		echo '<![CDATA['. $post['post_content'] .']]>';
		echo "</content:encoded>\n";

		echo "<pubDate>";
		echo $post['post_pubdate'];
		echo "</pubDate>\n";
	echo "</item>\n";
}

?>

</channel>
</rss>