/**
  * Guess the HREF for a button.
  *
  * @param ControlPanelBuilder $builder
  */
 public function guess(ControlPanelBuilder $builder)
 {
     $buttons = $builder->getButtons();
     $sections = $builder->getControlPanelSections();
     $active = $sections->active();
     $module = $this->modules->active();
     foreach ($buttons as &$button) {
         // If we already have an HREF then skip it.
         if (isset($button['attributes']['href'])) {
             continue;
         }
         // Determine the HREF based on the button type.
         switch (array_get($button, 'button')) {
             case 'add':
             case 'new':
             case 'create':
                 $button['attributes']['href'] = $active->getHref('create');
                 break;
             case 'export':
                 if ($module) {
                     $button['attributes']['href'] = $this->url->to('entry/handle/export/' . $module->getNamespace() . '/' . array_get($button, 'namespace') . '/' . array_get($button, 'stream'));
                 }
                 break;
         }
         $type = array_get($button, 'segment', array_get($button, 'button'));
         if (!isset($button['attributes']['href']) && $type) {
             $button['attributes']['href'] = $active->getHref($type);
         }
     }
     $builder->setButtons($buttons);
 }