Ticket #18346: post-index-shortcode.php

<?php
/*
Plugin Name: Post Index Shortcode
Plugin URI: http://jobjorn.se/
Description: Gives you a shortcode to display an alphabetized index, with a heading for each letter, either for all posts ([post-index]) or in a given category ([post-index category=ID]). For example useful if you run a cooking blog and want an index of your recipes.
Version: 0.1
Author: Jobjörn Folkesson
Author URI: http://jobjorn.se/
License: GPL3
*/


function post_index_init() {
        wp_register_style('post-index-stylesheet', plugins_url() . '/post-index-shortcode/style.css');
        wp_enqueue_style( 'post-index-stylesheet');
}
add_action('init', 'post_index_init');

add_shortcode('post-index', 'post_index_function');

function post_index_function ($atts) {
        extract(shortcode_atts(array('category' => ''), $atts));

        $query = array();
        if(is_numeric($atts['category'])){
                $query['cat'] = $atts['category'];
        }
        $query['posts_per_page'] = -1;
        $query['orderby'] = "title";
        $query['order'] = "ASC";
        
        $results = get_posts( $query ); // run the query

        $i = 0;
        foreach($results as $post){
                $i++;
                if($i == 1){
                        echo '<div class="post-index">';
                }
                $first_letter = strtoupper(mb_substr($post->post_title, 0, 1));
                if($previous_letter != $first_letter){
                        if($previous_letter != ""){
                                echo "</ul>";
                        }
                        echo "<h4>" . $first_letter . "</h4><ul>";
                }
                echo '<li><a class="recipe_link" href="' . get_permalink($post->ID) . '" rel="bookmark">' .  $post->post_title . '</a></li>';
                $previous_letter = $first_letter;
        }
        if($i > 0){
                echo "</ul></div>";
        }

        return $content;
}
?>