// Register the custom taxonomy for tootip
$labels = array(
    'name' => __('Tooltip Categories', 'wordpress-tooltips-ultimate'),
    'singular_name' => __('Tooltip Category', 'wordpress-tooltips-ultimate'),
    'search_items' => __('Search Tooltip Categories', 'wordpress-tooltips-ultimate'),
    'all_items' => __('All Tooltip Categories', 'wordpress-tooltips-ultimate'),
    'edit_item' => __('Edit Tooltip Category', 'wordpress-tooltips-ultimate'),
    'update_item' => __('Update Tooltip Category', 'wordpress-tooltips-ultimate'),
    'add_new_item' => __('Add New Tooltip Category', 'wordpress-tooltips-ultimate'),
    'new_item_name' => __('New Tooltip Category Name', 'wordpress-tooltips-ultimate'),
    'menu_name' => __('Tooltip Categories', 'wordpress-tooltips-ultimate'),
);
register_taxonomy('tooltip_selector_category', array('tooltip_selectors'), array(
    'hierarchical' => true,
    'parent_item_colon' => null,
    'labels' => $labels,
    'show_ui' => true,
    'show_admin_column' => true,
    'show_in_nav_menus' => true,
    'query_var' => true,
    'rewrite' => array('slug' => 'tooltip-category'),
));

// Show the custom taxonomy as a column in tooltips page
add_filter('manage_edit-tooltip_selectors_columns', 'edit_tooltip_columns', 20);
add_action('manage_tooltip_selectors_posts_custom_column', 'manage_tooltip_columns', 20, 2);

function edit_tooltip_columns($columns) {
    $columns['category_2'] = __('Category');
    return $columns;
}

function manage_tooltip_columns($column, $post_id) {
    global $post;
    if ($column == 'category_2') {
        $terms = get_the_terms($post_id, 'tooltip_selector_category');
        if (!empty($terms)) {
            $out = array();
            foreach ($terms as $term) {
                $out[] = sprintf('<a href="%s">%s</a>', esc_url(add_query_arg(array('post_type' => $post->post_type, 'page' => 'customize-tooltip-style', 'tooltip_style_id' => $term->term_id), 'edit.php')), esc_html(sanitize_term_field('name', $term->name, $term->term_id, 'genre', 'display'))
                );
            }
            echo join(', ', $out);
        }
    }
}