Add WooCommerce product variations to the WordPress Link Chooser

variations-link-chooser.php

<?php

namespace HWID\Woo;

class LinkChooser {
	static function init() {
		add_filter( 'wp_link_query_args', [ 'HWID\Woo\LinkChooser', 'add_variations_link' ] );
		add_filter( 'wp_link_query', [ 'HWID\Woo\LinkChooser', 'variations_labels' ], 10, 2 );
	}

	/**
	 * Add the `product_variation` post type to the default link chooser
	 *
	 * @param array $args
	 *
	 * @return array mixed
	 */
	static function add_variations_link( $args ) {

		$post_types = $args['post_type'];

		$post_types[] = 'product_variation';

		$args['post_type'] = $post_types;

		return $args;
	}

  /**
	 * Add the `Variation` label to the found link results.
   * 
   * Because the `product_variation` post type
   * is not public it does not properly display the post type label so we have to add it ourselves.
	 *
	 * @param array $results
   * @param $query
	 *
	 * @return array
	 */
	static function variations_labels( $results, $query ) {

		foreach( $results as &$result ) {
			if ( $result['info'] === null ) {
				$result['info'] = 'Variation';
			}
		}

		return $results;
	}


}

LinkChooser::init();