v0.2.0

tinyrelated.php

<?php
/*
Plugin Name: tinyRelated
Plugin URI: http://wordpress.org/plugins/tinyrelated/
Description: A tiny and simple related posts plugin.
Author: Arūnas Liuiza
Version: 0.2.0
Author URI: http://klausk.aruno.lt/
License: GPL2

    Copyright 2014  Arūnas Liuiza  (email : klausk@aruno.lt)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2, as 
    published by the Free Software Foundation.

    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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

// block direct access to plugin file
defined('ABSPATH') or die("No script kiddies please!");

// add filter to automatically show related posts after post content
add_filter( 'the_content', array( 'tinyRelated', 'append_list') );

// main plugin class
class tinyRelated {
  // options
  public static $options = array(
    'general_count'      => 5,
    'general_show_after' => true,
  );

  // add list to the end of post_content
  public static function append_list( $content ) {
    if (is_singular('post')) {
      if ( self::$options['general_show_after'] ) {
        $post_id = get_the_id();
        $related = self::build_list($post_id);
        $content .= "\r\n".$related;
      }
    }
    return $content;
  }
  
  // build html for related post list
  public static function build_list($post) {
    if (is_numeric($post)) {
      $post = get_post($post);
    }
    $posts = tinyRelated::get_list($post);
    $return .= apply_filters( 'tinyrelated_list_title', '<h3>'.'Related posts'.'</h3>' );
    $return .= apply_filters( 'tinyrelated_list_start', '<ul class="tinyrelated">' );
    foreach ($posts as $related_post) {
      if (is_numeric($related_post)) {
        $related_post = get_post($related_post);
      }
      if (!$related_post || $related_post->post_status != 'publish') {
        continue;
      }
      $return .= sprintf(
        apply_filters( 'tinyrelated_list_item', '<li><a href="%1$s">%2$s</a></li>' ), 
        get_permalink($related_post),
        get_the_title($related_post)
      );
    }
    $return .= apply_filters( 'tinyrelated_list_end', '</ul>' );
    return $return;
  }

  // get array of related posts - only dummy for now
  public static function get_list($post) {
    if (is_numeric($post)) {
      $post = get_post($post);
    }
    $args = array(
      'post_type'       => $post->post_type,
      'post_status'     => 'publish',
      'posts_per_page'  => self::$options['general_count'],
      'orderby'         => 'rand',
    );
    $return = new WP_Query($args);
    return $return->posts;
  }
}

?>