<?php
/*
Plugin Name: Music Collection Post Types
Plugin URI: http://example.com
Description: Creates the music_album post type.
Version: 0.1
*/
 
/* Set up the post types. */
add_action( 'init', 'ssd_music_collection_register_post_types' );
 
/* Registers post types. */
function ssd_music_collection_register_post_types() {
 
    /* Set up the arguments for the 'music_album' post type. */
    $album_args = array(
        'public' => true,
        'query_var' => 'music_album',
        'rewrite' => array(
            'slug' => 'music/albums',
            'with_front' => false,
        ),
        'supports' => array(
            'title',
            'thumbnail'
        ),
        'labels' => array(
            'name' => 'Albums',
            'singular_name' => 'Album',
            'add_new' => 'Add New Album',
            'add_new_item' => 'Add New Album',
            'edit_item' => 'Edit Album',
            'new_item' => 'New Album',
            'view_item' => 'View Album',
            'search_items' => 'Search Albums',
            'not_found' => 'No Albums Found',
            'not_found_in_trash' => 'No Albums Found In Trash'
        ),
    );
 
    /* Register the music album post type. */
    register_post_type( 'music_album', $album_args );
}
 
?>

<?php
 
/* Set up the taxonomies. */
add_action( 'init', 'ssd_music_collection_register_taxonomies' );
 
/* Registers taxonomies. */
function ssd_music_collection_register_taxonomies() {
 
    /* Set up the artist taxonomy arguments. */
    $artist_args = array(
        'hierarchical' => false,
        'query_var' => 'album_artist', 
        'show_tagcloud' => true,
        'rewrite' => array(
            'slug' => 'music/artists',
            'with_front' => false
        ),
        'labels' => array(
            'name' => 'Artists',
            'singular_name' => 'Artist',
            'edit_item' => 'Edit Artist',
            'update_item' => 'Update Artist',
            'add_new_item' => 'Add New Artist',
            'new_item_name' => 'New Artist Name',
            'all_items' => 'All Artists',
            'search_items' => 'Search Artists',
            'popular_items' => 'Popular Artists',
            'separate_items_with_commas' => 'Separate artists with commas',
            'add_or_remove_items' => 'Add or remove artists',
            'choose_from_most_used' => 'Choose from the most popular artists',
        ),
    );
 
    /* Set up the genre taxonomy arguments. */
    $genre_args = array(
        'hierarchical' => true,
        'query_var' => 'album_genre', 
        'show_tagcloud' => true,
        'rewrite' => array(
            'slug' => 'music/genres',
            'with_front' => false
        ),
        'labels' => array(
            'name' => 'Genres',
            'singular_name' => 'Genre',
            'edit_item' => 'Edit Genre',
            'update_item' => 'Update Genre',
            'add_new_item' => 'Add New Genre',
            'new_item_name' => 'New Genre Name',
            'all_items' => 'All Genres',
            'search_items' => 'Search Genres',
            'parent_item' => 'Parent Genre',
            'parent_item_colon' => 'Parent Genre:',
        ),
    );
 
    /* Register the album artist taxonomy. */
    register_taxonomy( 'album_artist', array( 'music_album' ), $artist_args );
 
    /* Register the album genre taxonomy. */
    register_taxonomy( 'album_genre', array( 'music_album' ), $genre_args );
}
 
?>

<?php
 
add_action( 'init', 'ssd_music_album_register_shortcodes' );
 
function ssd_music_album_register_shortcodes() {
 
    /* Register the [music_albums] shortcode. */
    add_shortcode( 'music_albums', 'ssd_music_albums_shortcode' );
}
 
function ssd_music_albums_shortcode() {
 
    /* Query albums from the database. */
    $loop = new WP_Query(
        array(
            'post_type' => 'music_album',
            'orderby' => 'title',
            'order' => 'ASC',
            'posts_per_page' => -1,
        )
    );
 
    /* Check if any albums were returned. */
    if ( $loop->have_posts() ) {
 
        /* Open an unordered list. */
        $output = '<ul class="music-collection">';
 
        /* Loop through the albums (The Loop). */
        while ( $loop->have_posts() ) {
 
            $loop->the_post();
 
            /* Display the album title. */
            $output .= the_title(
                '<li><a href="' . get_permalink() . '">',
                '</a></li>',
                false
            );
 
        }
 
        /* Close the unordered list. */
        $output .= '</ul>';
    }
 
    /* If no albums were found. */
    else {
        $output = '<p>No albums have been published.';
    }
 
    /* Return the music albums list. */
    return $output;
}
 
?>