JetEngine Custom macro - Empty terms

code

// place the code in the child theme functions.php or a custom code snippets plugin like FluentSnippets
// how to use
// Create a new Terms Query in the Query builder
// Go to the Include/Exclude section
// click the Include section dynamic icon and choose the Empty terms option, and select whitch terms want to use

add_action( 'jet-engine/register-macros', function() {

    class Empty_Terms_Macro extends \Jet_Engine_Base_Macros {

        public function macros_tag() {
            return 'empty_terms';
        }

        public function macros_name() {
            return 'Empty Terms';
        }

        public function macros_args() {
            $taxonomies = get_taxonomies(array('public' => true), 'objects');
            $taxonomy_options = array();

            foreach ($taxonomies as $taxonomy) {
                $taxonomy_options[$taxonomy->name] = $taxonomy->label . ' (' . $taxonomy->name . ')';
            }

            return array(
                'taxonomy' => array(
                    'label'   => 'Taxonomy',
                    'type'    => 'select',
                    'options' => $taxonomy_options,
                    'default' => key($taxonomy_options)
                ),
            );
        }

        public function macros_callback( $args = array() ) {
            if ( empty( $args['taxonomy'] ) ) {
                return 'No taxonomy specified';
            }

            $taxonomy = $args['taxonomy'];

            $terms = get_terms(array(
                'taxonomy'   => $taxonomy,
                'hide_empty' => false,
            ));

            $empty_terms = array();

            foreach ( $terms as $term ) {
                if ( $term->count == 0 ) {
                    $empty_terms[] = $term->term_id;
                }
            }

            if ( empty( $empty_terms ) ) {
                return 'No empty terms found';
            }

            return implode( ',', $empty_terms );
        }
    }

    new Empty_Terms_Macro();

});