Documentation

Hi

this is a simple snippet to use this plugin

// create a new post status
add_action('init','myplugin_init');
function myplugin_init() {
  register_post_status( 'closed',
                         array(
				'label' => 'Closed',
				'public' => false,
			) );
}

// hook to "available_status" to add new status in the select in "publish box"
//add_filter('available_statuses','myplugin_liststatus');  // for a bug this don't work properly. use next hook, instead
add_filter('myposttype_available_statuses','myplugin_liststatus'); // you can use this in you want edit select only for myposttype
function myplugin_liststatus($statuses) {
    $statuses['closed'] = 'Closed';
    return $statuses;
}

// hook to "publish_action" to edit label in publish button when you want go in your new status
add_filter('publish_action','myplugin_publish_action');
//add_filter('myposttype_publish_action','myplugin_publish_action');
function myplugin_publish_action($action) {
global $post;
    switch ($post->post_status) {
    /*
      this is normal work-flow
        case 'draft'     :
        case 'auto-draft':
                           if (current_user_can('publish')) return array('label'=>'Publish', 'action'=>'publish');
                           else                             return array('label'=>'Pending', 'action'=>'publish');
        break;
        case 'pending' :
        					return array('label'=>'Publish', 'action'=>'publish');
        break;
    */
        case 'publish'   : if (current_user_can('publish_myposttype')) return array('label'=>'Close now', 'action'=>'publish');
                           else                                  return array('label'=>'Update', 'action'=>'publish');
        break;
        case 'closed'   :
        					return array('label'=>'Re-open', 'action'=>'publish');
        break;

    }

}
// You can use "save_action" hook to edit label in "save" button
add_filter('save_action','myplugin_save_action');
//add_filter('myposttype_save_action','myplugin_save_action');
function myplugin_save_action($action) {
global $post;
    if ($post->post_status=='closed') return array('label'=>'Save as closed', 'action'=>'save');
 }

// REMEMBER : set the correct status in publish_post action because anoter filter/plugin can reset your status in "publish"
add_action('publish_myposttype','myplugin_workflow');
function myplugin_workflow() {
global $post;

    $new_status = $post->post_status;
    if ($_POST['post_status']=='closed') $post->post_status = 'closed';
    if ($new_status!='publish') wp_update_post($post);

}

of course you can use only the hooks that you need

if you need more explanation post another comment here,

goodnight