<?php
/*
Plugin Name: Old-style permalinks redirect
Version: 0.1
Plugin URI: http://www.fabriziotarizzo.org/sw/sw-en/#wpredir
Description: This plugin translates old-style permalinks in 301-redirects to new-style permalinks 
Author: Fabrizio Tarizzo
Author URI: http://www.fabriziotarizzo.org/
*/
/*  Copyright (C) 2005  Fabrizio Tarizzo

    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 2 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, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

function ftr_old_plinks_redirect () {
	global $wp_query;
	
	if (preg_match("/^p\=([0-9]*)$/", $wp_query->query, $matches)) {
		$post_ID = $matches[1];
		$plink = get_permalink($post_ID);
		header("HTTP/1.1 301 Moved Permanently");
		header("Location: $plink");
		exit(); 
	} elseif (preg_match("/^m\=([0-9]{4})([0-9]{2})$/", $wp_query->query, $matches)) {
		$year = $matches[1];
		$month = $matches[2];
		$plink = get_settings('home') . "/" . $year . "/" . $month . "/";
		header("HTTP/1.1 301 Moved Permanently");
		header("Location: $plink");
		exit(); 
	} 
}

add_action ('template_redirect', 'ftr_old_plinks_redirect');
?>