How to add custom post type archive page links to nav menu?

I cannot figure this out. There seems to be no checkbox or anything similar in function to add the newly created custom post type archive page into the menu.

Also the link must be active, if you are on the page. This probably isn’t possible, but is there some plugin for it? For the love of me, I cannot find it 🙁

I only found this plugin called Custom Post Type Archives in Nav Menus, that doesn’t really do anything, but add custom link to the menu..with the full site-url. It doesn’t go active or isn’t very dynamic.

I thought that, probably the easiest way would be to override wp_nav_menu() and add my links manually and then use $_GET information to control the “currently active link”.

This is one method that I think should work (though it’s not tested).

//Hook on to the filter for the (custom) main menu
// 'wp_list_pages' filter is a fallback, when a custom menu isn't being used 
add_filter( 'wp_list_pages', 'new_nav_menu_items' );
add_filter( 'wp_nav_menu_items', 'new_nav_menu_items' );
//Can also hook into a specific menu...
//add_filter( 'wp_nav_menu_{$menu->slug}_items', 'new_nav_menu_items' );

function new_nav_menu_items($items) {
    global $wp_query;
    $class="";

    //Checks if we are viewing CPT 'myposttype', if so give it the 'active' class.
    if(isset($wp_query->query_vars['post_type'])&& $wp_query->query_vars['post_type']=='myposttype') 
        $class="current_page_item";

    //This generates the url of the CPT archive page
    $url = add_query_arg('post_type','myposttype',site_url());

    $myitem = '<li class="'.$class.'"><a href="'.$url.'">My Custom Post Type</a></li>';

    $items = $items . $myitem;
    return $items;
}

This doesn’t seem to me, to be the cleanest of solution, but I don’t know of any other way. If there is, I’d like to see it!

Finally, the link url the custom item links to is not ‘pretty’ – but you could make it so if you new the slug of the CPT (assuming custom permalinks are being used….)