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rather-simple-book-custom-post-type.php
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rather-simple-book-custom-post-type.php
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<?php
/**
* Plugin Name: Rather Simple Book Custom Post Type
* Update URI: false
* Version: 1.0
* Requires at least: 5.3
* Requires PHP: 7.4
* Author: Oscar Ciutat
* Author URI: http://oscarciutat.com/code
* Text Domain: rather-simple-book-custom-post-type
* Description: A book custom post type
* License: GPLv2 or later
*
* 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
*
* @package rather_simple_book_custom_post_type
*/
class Rather_Simple_Book_Custom_Post_Type {
/**
* Plugin instance.
*
* @var object $instance
*/
protected static $instance = null;
/**
* Access this plugin’s working instance
*/
public static function get_instance() {
if ( ! self::$instance ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Used for regular plugin work.
*/
public function plugin_setup() {
$this->includes();
add_action( 'init', array( $this, 'load_language' ) );
add_action( 'init', array( $this, 'register_custom_type' ) );
add_action( 'wp_head', array( $this, 'head' ) );
add_filter( 'manage_book_posts_columns', array( $this, 'book_posts_columns' ) );
add_action( 'manage_book_posts_custom_column', array( $this, 'book_posts_custom_column' ) );
add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
add_action( 'post_thumbnail', array( $this, 'post_thumbnail' ) );
add_filter( 'template_include', array( $this, 'template_include' ) );
add_filter( 'pre_get_posts', array( $this, 'pre_get_posts' ) );
add_filter( 'redirect_canonical', array( $this, 'disable_redirect_canonical' ) );
add_shortcode( 'bookindex', array( $this, 'display_shortcode' ) );
}
/**
* Constructor. Intentionally left empty and public.
*/
public function __construct() {}
/**
* Includes required core files used in admin and on the frontend.
*/
protected function includes() {
require_once 'includes/functions.php';
}
/**
* Loads language
*/
public function load_language() {
load_plugin_textdomain( 'rather-simple-book-custom-post-type', false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );
}
/**
* Register custom post type
*/
public function register_custom_type() {
$labels = array(
'name' => __( 'Books', 'rather-simple-book-custom-post-type' ),
'singular_name' => __( 'Book', 'rather-simple-book-custom-post-type' ),
'add_new' => __( 'Add New Book', 'rather-simple-book-custom-post-type' ),
'add_new_item' => __( 'Add New Book', 'rather-simple-book-custom-post-type' ),
'edit_item' => __( 'Edit Book', 'rather-simple-book-custom-post-type' ),
'new_item' => __( 'New Book', 'rather-simple-book-custom-post-type' ),
'view_item' => __( 'View Book', 'rather-simple-book-custom-post-type' ),
'search_items' => __( 'Search Books', 'rather-simple-book-custom-post-type' ),
'not_found' => __( 'No Books found', 'rather-simple-book-custom-post-type' ),
'not_found_in_trash' => __( 'No Books found in Trash', 'rather-simple-book-custom-post-type' ),
);
$args = array(
'show_ui' => true,
'show_in_rest' => true,
'public' => true,
'labels' => $labels,
'menu_position' => 5,
'menu_icon' => 'dashicons-book',
'supports' => array( 'title', 'editor', 'comments', 'thumbnail' ),
'rewrite' => true,
'has_archive' => 'books',
);
register_post_type( 'book', $args );
// Types.
$labels = array(
'name' => __( 'Types', 'rather-simple-book-custom-post-type' ),
'singular_name' => __( 'Type', 'rather-simple-book-custom-post-type' ),
'add_new_item' => __( 'Add New Type', 'rather-simple-book-custom-post-type' ),
'edit_item' => __( 'Edit Type', 'rather-simple-book-custom-post-type' ),
'new_item_name' => __( 'New Type', 'rather-simple-book-custom-post-type' ),
'search_items' => __( 'Search Types', 'rather-simple-book-custom-post-type' ),
'all_items' => __( 'All Types', 'rather-simple-book-custom-post-type' ),
'popular_items' => __( 'Popular Types', 'rather-simple-book-custom-post-type' ),
);
$args = array(
'show_ui' => true,
'show_in_rest' => true,
'public' => true,
'labels' => $labels,
'hierarchical' => true,
'show_admin_column' => true,
);
register_taxonomy( 'book_type', 'book', $args );
// Authors.
$labels = array(
'name' => __( 'Authors', 'rather-simple-book-custom-post-type' ),
'singular_name' => __( 'Author', 'rather-simple-book-custom-post-type' ),
'add_new_item' => __( 'Add New Author', 'rather-simple-book-custom-post-type' ),
'edit_item' => __( 'Edit Author', 'rather-simple-book-custom-post-type' ),
'new_item_name' => __( 'New Author', 'rather-simple-book-custom-post-type' ),
'search_items' => __( 'Search Authors', 'rather-simple-book-custom-post-type' ),
'all_items' => __( 'All Authors', 'rather-simple-book-custom-post-type' ),
'popular_items' => __( 'Popular Authors', 'rather-simple-book-custom-post-type' ),
);
$args = array(
'show_ui' => true,
'show_in_rest' => true,
'public' => true,
'labels' => $labels,
'hierarchical' => true,
'show_admin_column' => true,
);
register_taxonomy( 'book_author', 'book', $args );
// Publishers.
$labels = array(
'name' => __( 'Publishers', 'rather-simple-book-custom-post-type' ),
'singular_name' => __( 'Publisher', 'rather-simple-book-custom-post-type' ),
'add_new_item' => __( 'Add New Publisher', 'rather-simple-book-custom-post-type' ),
'edit_item' => __( 'Edit Publisher', 'rather-simple-book-custom-post-type' ),
'new_item_name' => __( 'New Publisher', 'rather-simple-book-custom-post-type' ),
'search_items' => __( 'Search Publishers', 'rather-simple-book-custom-post-type' ),
'all_items' => __( 'All Publishers', 'rather-simple-book-custom-post-type' ),
'popular_items' => __( 'Popular Publishers', 'rather-simple-book-custom-post-type' ),
);
$args = array(
'show_ui' => true,
'show_in_rest' => true,
'public' => true,
'labels' => $labels,
'hierarchical' => true,
'show_admin_column' => true,
);
register_taxonomy( 'book_publisher', 'book', $args );
}
/**
* Enqueue scripts
*/
public function enqueue_scripts() {
// Load styles.
wp_enqueue_style(
'bcpt-style',
plugins_url( '/style.css', __FILE__ ),
array(),
filemtime( plugin_dir_path( __FILE__ ) . '/style.css' )
);
}
/**
* Head
*/
public function head() {
$content = '<link rel="alternate" type="application/rss+xml" href="';
$content .= get_post_type_archive_feed_link( 'book' );
$content .= '" title="';
$content .= esc_attr( get_bloginfo( 'name' ) );
$content .= ' » ' . __( 'Books Feed', 'rather-simple-book-custom-post-type' );
$content .= '" />';
$content .= "\n";
echo $content;
}
/**
* Book posts columns
*/
public function book_posts_columns( $columns ) {
$new = array();
foreach ( $columns as $key => $value ) {
if ( 'title' === $key ) {
// Put the columns before the Title column.
$new['thumbnail'] = __( 'Cover', 'rather-simple-book-custom-post-type' );
}
$new[ $key ] = $value;
}
return $new;
}
/**
* Book posts custom column
*/
public function book_posts_custom_column( $column ) {
global $post;
switch ( $column ) {
case 'thumbnail':
if ( has_post_thumbnail( $post->ID ) ) {
$thumb = get_the_post_thumbnail( $post->ID, array( 100, 100 ) );
}
if ( isset( $thumb ) && $thumb ) {
echo $thumb;
} else {
echo __( 'None', 'rather-simple-book-custom-post-type' );
}
break;
}
}
/**
* Display shortcode
*/
public function display_shortcode( $attr ) {
$atts = shortcode_atts(
array(
'group_by' => 'books',
),
$attr,
'bookindex'
);
if ( 'publishers' === $atts['group_by'] ) {
ob_start();
$this->get_template_part( 'index-publisher' );
return ob_get_clean();
} elseif ( 'authors' === $atts['group_by'] ) {
ob_start();
$this->get_template_part( 'index-author' );
return ob_get_clean();
} else {
ob_start();
$this->get_template_part( 'index-book' );
return ob_get_clean();
}
$html .= '</div>';
return $html;
}
/**
* Post thumbnail
*/
public function post_thumbnail( $size ) {
global $_wp_additional_image_sizes;
if ( has_post_thumbnail() ) {
$html = '<a href="' . get_permalink() . '">';
$html .= wp_get_attachment_image( get_post_thumbnail_id( get_the_ID() ), $size );
$html .= '</a>';
} else {
if ( isset( $_wp_additional_image_sizes ) &&
count( $_wp_additional_image_sizes ) &&
in_array( $size, array_keys( $_wp_additional_image_sizes ), true ) ) {
$width = $_wp_additional_image_sizes[ $size ]['width'];
$height = $_wp_additional_image_sizes[ $size ]['height'];
} else {
$width = get_option( $size . '_size_w' );
$height = get_option( $size . '_size_h' );
}
$html = '<a href="' . esc_url( get_permalink() ) . '">';
$html .= '<img src="' . esc_url( plugins_url( 'assets/images/placeholder.png', __FILE__ ) ) . '" width="' . esc_attr( $width ) . '" height="' . esc_attr( $height ) . '" alt="' . esc_attr( get_the_title() ) . '" />';
$html .= '</a>';
}
echo $html;
}
/**
* Disable redirect canonical
*/
public function disable_redirect_canonical( $redirect_url ) {
// if ( is_singular( 'book' ) ) {
// $redirect_url = false;
// }
return $redirect_url;
}
/**
* Pre get posts
*/
public function pre_get_posts( $query ) {
if ( is_feed() ) {
$query->set( 'post_type', array( 'post', 'book' ) );
}
return $query;
}
/**
* Template include
*/
public function template_include( $template ) {
global $post;
if ( is_front_page() ) {
if ( $file = locate_template( array( 'front-page.php' ) ) ) {
$template = $file;
} else {
$template = plugin_dir_path( __FILE__ ) . '/templates/front-page.php';
}
}
if ( is_post_type_archive( 'book' ) ) {
if ( $file = locate_template( array( 'archive-book.php' ) ) ) {
$template = $file;
} else {
$template = plugin_dir_path( __FILE__ ) . '/templates/archive-book.php';
}
}
if ( is_singular( 'book' ) ) {
if ( $file = locate_template( array( 'single-book.php' ) ) ) {
$template = $file;
} else {
$template = plugin_dir_path( __FILE__ ) . '/templates/single-book.php';
}
}
if ( is_tax( 'book_author' ) ) {
if ( $file = locate_template( array( 'taxonomy-book_author.php' ) ) ) {
$template = $file;
} else {
$template = plugin_dir_path( __FILE__ ) . '/templates/taxonomy-book_author.php';
}
}
if ( is_tax( 'book_publisher' ) ) {
if ( $file = locate_template( array( 'taxonomy-book_publisher.php' ) ) ) {
$template = $file;
} else {
$template = plugin_dir_path( __FILE__ ) . '/templates/taxonomy-book_publisher.php';
}
}
if ( is_tax( 'book_type' ) ) {
if ( $file = locate_template( array( 'taxonomy-book_type.php' ) ) ) {
$template = $file;
} else {
$template = plugin_dir_path( __FILE__ ) . '/templates/taxonomy-book_type.php';
}
}
if ( is_search() ) {
if ( $file = locate_template( array( 'search.php' ) ) ) {
$template = $file;
} else {
$template = plugin_dir_path( __FILE__ ) . '/templates/search.php';
}
}
return $template;
}
/**
* Get template part
*/
public function get_template_part( $slug, $name = null ) {
$templates = array();
$name = (string) $name;
if ( '' !== $name ) {
$templates[] = "{$slug}-{$name}.php";
}
$templates[] = "{$slug}.php";
$this->locate_template( $templates, true, false );
}
/**
* Locate template
*/
public function locate_template( $template_names, $load = false, $require_once = true ) {
if ( ! is_array( $template_names ) ) {
return '';
}
$located = '';
$ep_plugin_templates_dir = plugin_dir_path( __FILE__ ) . 'templates';
foreach ( $template_names as $template_name ) {
if ( ! $template_name ) {
continue;
}
if ( file_exists( get_stylesheet_directory() . '/' . $template_name ) ) {
$located = get_stylesheet_directory() . '/' . $template_name;
break;
} elseif ( file_exists( get_template_directory() . '/' . $template_name ) ) {
$located = get_template_directory() . '/' . $template_name;
break;
} elseif ( file_exists( $ep_plugin_templates_dir . '/' . $template_name ) ) {
$located = $ep_plugin_templates_dir . '/' . $template_name;
break;
}
}
if ( $load && '' !== $located ) {
load_template( $located, $require_once );
}
return $located;
}
}
add_action( 'plugins_loaded', array( Rather_Simple_Book_Custom_Post_Type::get_instance(), 'plugin_setup' ) );