Register "item" custom taxonomy for woocommerce products

woocommerce-custom-taxonomy-product-item.php

<?php
/**
 * Woocommerce "item" taxonomy
 *
 * This plugin is a template to add a custom taxonomy to products in woocommerce.
 * One should search/replace every "Item" occurence with the taxonomy name.
 *
 * @link              https://gist.github.com/smeric/523c54a16f2ed1870a60
 * @since             1.0.0
 * @package           woocommerce_custom_taxonomy_product_item
 *
 * @wordpress-plugin
 * Plugin Name:       Woocommerce "item" taxonomy
 * Plugin URI:        https://gist.github.com/smeric/523c54a16f2ed1870a60
 * Description:       This plugin is a template to add a custom taxonomy to products in woocommerce. One should search/replace every "Item" occurence with the taxonomy name.
 * Version:           1.0.0
 * Author:            Sébastien Méric <[email protected]>
 * Author URI:        http://www.sebastien-meric.com/
 * License:           GPL-2.0+
 * License URI:       http://www.gnu.org/licenses/gpl-2.0.txt
 * Text Domain:       woocommerce_custom_taxonomy_product_item
 * Domain Path:       /languages
 * 
 * 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 2 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.
 *
 * 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
 */

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * Define the internationalization functionality.
 *
 * Loads and defines the internationalization files for this plugin
 * so that its ready for translation.
 * 
 * @since      1.0.0
 * @package    woocommerce_custom_taxonomy_product_item
 * @author     Sébastien Méric <[email protected]>
 **/
add_action( 'after_setup_theme', 'woocommerce_custom_taxonomy_product_item_after_setup_theme' );
function woocommerce_custom_taxonomy_product_item_after_setup_theme() {
	// Load the plugin text domain for translation.
	$locale = apply_filters( 'woocommerce_custom_taxonomy_product_item_locale', get_locale(), 'woocommerce_custom_taxonomy_product_item' );
	load_textdomain( 'woocommerce_custom_taxonomy_product_item', trailingslashit( WP_LANG_DIR ) . 'woocommerce_custom_taxonomy_product_item/woocommerce_custom_taxonomy_product_item-' . $locale . '.mo' );
	load_plugin_textdomain( 'woocommerce_custom_taxonomy_product_item', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' );
}

/**
 * Register "item" custom taxonomy for woocommerce products
 * 
 * @since      1.0.0
 * @package    woocommerce_custom_taxonomy_product_item
 * @author     Sébastien Méric <[email protected]>
 */
add_action( 'woocommerce_register_taxonomy', 'woocommerce_custom_taxonomy_product_item' );
function woocommerce_custom_taxonomy_product_item() {
	register_taxonomy( 'product_item',
		apply_filters( 'woocommerce_taxonomy_objects_product_item', array( 'product' ) ),
		apply_filters( 'woocommerce_taxonomy_args_product_item', array(
			'hierarchical'          => true,
			'update_count_callback' => '_wc_term_recount',
			'label'                 => __( 'Product Items', 'woocommerce_custom_taxonomy_product_item' ),
			'labels' => array(
				'name'              => __( 'Product Items', 'woocommerce_custom_taxonomy_product_item' ),
				'singular_name'     => __( 'Product Item', 'woocommerce_custom_taxonomy_product_item' ),
				'menu_name'         => _x( 'Items', 'Admin menu name', 'woocommerce_custom_taxonomy_product_item' ),
				'search_items'      => __( 'Search Product Items', 'woocommerce_custom_taxonomy_product_item' ),
				'all_items'         => __( 'All Product Items', 'woocommerce_custom_taxonomy_product_item' ),
				'parent_item'       => __( 'Parent Product Item', 'woocommerce_custom_taxonomy_product_item' ),
				'parent_item_colon' => __( 'Parent Product Item:', 'woocommerce_custom_taxonomy_product_item' ),
				'edit_item'         => __( 'Edit Product Item', 'woocommerce_custom_taxonomy_product_item' ),
				'update_item'       => __( 'Update Product Item', 'woocommerce_custom_taxonomy_product_item' ),
				'add_new_item'      => __( 'Add New Product Item', 'woocommerce_custom_taxonomy_product_item' ),
				'new_item_name'     => __( 'New Product Item Name', 'woocommerce_custom_taxonomy_product_item' ),
				'separate_items_with_commas' => __( 'Separate Product Item with commas', 'woocommerce_custom_taxonomy_product_item' ),
				'search_items'               => __( 'Search Product Items', 'woocommerce_custom_taxonomy_product_item' ),
				'add_or_remove_items'        => __( 'Add or remove Product Items', 'woocommerce_custom_taxonomy_product_item' ),
				'choose_from_most_used'      => __( 'Choose from the most used Product Items', 'woocommerce_custom_taxonomy_product_item' ),
			),
			'show_ui'               => true,
			'query_var'             => true,
			'capabilities'          => array(
				'manage_terms' => 'manage_product_terms',
				'edit_terms'   => 'edit_product_terms',
				'delete_terms' => 'delete_product_terms',
				'assign_terms' => 'assign_product_terms',
			),
			'rewrite'               => array(
				'slug'         => empty( $permalinks['item_base'] ) ? _x( 'product-item', 'slug', 'woocommerce_custom_taxonomy_product_item' ) : $permalinks['item_base'],
				'with_front'   => false,
				'hierarchical' => true,
			),
		) )
	);
}

/**
 * Display product items after product categories and tags on product page.
 * 
 * @since      1.0.0
 * @package    woocommerce_custom_taxonomy_product_item
 * @author     Sébastien Méric <[email protected]>
 */
add_action( 'woocommerce_product_meta_end', 'woocommerce_custom_taxonomy_product_item_display' );
function woocommerce_custom_taxonomy_product_item_display(){
	global $post;

	$item_count = sizeof( get_the_terms( $post->ID, 'product_item' ) );

	echo get_the_term_list( $post->ID, 'product_item', '<span class="itemed_as">' . _n( 'Item:', 'Items:', $item_count, 'woocommerce_custom_taxonomy_product_item' ) . ' ', ', ', '.</span>' );
}

/**
 * Init our settings
 * 
 * @since      1.0.0
 * @package    woocommerce_custom_taxonomy_product_item
 * @author     Sébastien Méric <[email protected]>
 */
add_action( 'admin_init', 'woocommerce_custom_taxonomy_product_item_initialize_theme_options' );  
function woocommerce_custom_taxonomy_product_item_initialize_theme_options() {  
	// Add our settings
	add_settings_field(
		'woocommerce_custom_taxonomy_product_item_slug',    // id
		__( 'Product item base', 'woocommerce_custom_taxonomy_product_item' ),    // setting title
		'woocommerce_custom_taxonomy_product_item_slug_input',    // display callback
		'permalink',    // settings page
		'optional'    // settings section
	);

	// We need to save the options ourselves; settings api does not trigger save for the permalinks page
	if ( isset( $_POST['permalink_structure'] ) || isset( $_POST['item_base'] ) ) {
		// Item base
		$woocommerce_product_item_slug = wc_clean( $_POST['woocommerce_product_item_slug'] );

		$permalinks = get_option( 'woocommerce_permalinks' );

		if ( ! $permalinks ) {
			$permalinks = array();
		}

		$permalinks['item_base'] = untrailingslashit( $woocommerce_product_item_slug );

		update_option( 'woocommerce_permalinks', $permalinks );
	}

}

/**
 * Show a slug input box on permalinks page.
 * 
 * @since      1.0.0
 * @package    woocommerce_custom_taxonomy_product_item
 * @author     Sébastien Méric <[email protected]>
 */
function woocommerce_custom_taxonomy_product_item_slug_input() {
	$permalinks = get_option( 'woocommerce_permalinks' );
?>
	<input name="woocommerce_product_item_slug" type="text" class="regular-text code" value="<?php if ( isset( $permalinks['item_base'] ) ) echo esc_attr( $permalinks['item_base'] ); ?>" placeholder="<?php echo _x( 'product-item', 'slug', 'woocommerce_custom_taxonomy_product_item' ) ?>" />
<?php
}