<?php
/*
Plugin Name: Digital Rust WordPress Plugin
Plugin URI:
Description: This plugin degrades WordPress posts at random over time
Version: 0.2a
Author: Steve Moss & cackhandedly modded by Frank Swain
Author URI: http://stevemoss.ath.cx/
License: GPLv3
*/

/*      
        Digital Rust - Degrades WordPress posts at random over time
    Copyright (C) 2012  Steve Moss (gawbul@gmail.com)

    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/>.
*/

function digital_rust_init() {
        global $wpdb;   
        global $title_len, $content_len, $excerpt_len;
        
        // Get current post ID
        $this_id = get_the_ID();

        // Setup SELECT SQL query
        $sql = "SELECT ID, post_title, post_content, post_excerpt
        FROM $wpdb->posts
        WHERE post_status = 'publish' AND ID <> $this_id
        ORDER BY RAND()
        LIMIT 1";
        
        // Get SQL results
        $posts = $wpdb->get_results($sql);

        // Set variables from SQL results
        $post_id = $posts[0]->ID;
        $post_title = $posts[0]->post_title;
        $post_content = $posts[0]->post_content;
        $post_excerpt = $posts[0]->post_excerpt;

        // Get length of post title and content
        $title_len = strlen($post_title);
        $content_len = strlen($post_content);
        $excerpt_len = strlen($post_excerpt);
        
        // Set decay lens to 5% and 10%
        $decay_title_len = ceil($title_len / 100 * 5); // always round up
        $decay_content_len = round($content_len / 100 * 10); // use standard round
        $decay_excerpt_len = round($excerpt_len / 100 * 10); // use standard round
        
        // Decay title
	$post_title = str_replace("&nbsp;", "_", $post_title); // remove all existing nbsp so next step won't break them

        foreach(range(1, $decay_title_len) as $number):
                $rnd = rand(1, $title_len);
                $post_title = substr_replace($post_title, "_", $rnd, 1);
        endforeach;

	$post_title = str_replace("_", "&nbsp;", $post_title); // change all underscores back into nbsp
        
        // Decay content
	$post_content = str_replace("&nbsp;", "_", $post_content); // remove existing nbsp 

        foreach(range(1, $decay_content_len) as $number):
                $rnd = rand(1, $content_len);
                $post_content = substr_replace($post_content, "_", $rnd, 1);
        endforeach;

	$post_content = str_replace("_", "&nbsp;", $post_content); // change all underscores back into nbsp


        // Decay excerpt
	$post_excerpt = str_replace("&nbsp;", "_", $post_excerpt); // remove existing nbsp 

        foreach(range(1, $decay_excerpt_len) as $number):
                $rnd = rand(1, $excerpt_len);
                $post_excerpt = substr_replace($post_excerpt, "_", $rnd, 1);
        endforeach;

	$post_excerpt = str_replace("_", "&nbsp;", $post_excerpt); // change all underscores back into nbsp



        // Update database
        $wpdb->update(
                                        $wpdb->posts,
                                        array(
                                                        'post_title' => $post_title,
                                                        'post_content' => $post_content,
                                                        'post_excerpt' => $post_excerpt,
                                        ),
                                        array(  'ID' => $post_id),
                                        array(
                                                        '%s',
                                                        '%s'
                                        ), 
                                        array('%d') 
        );
}

add_action('wp_footer', 'digital_rust_init');
?>