/**
  * Main method.
  *
  * @since 0.1
  *
  * @param string|null $arg
  */
 public function execute($subPage)
 {
     parent::execute($subPage);
     if ($this->subPage === '') {
         $this->displayNavigation();
         EPTerm::displayAddNewRegion($this->getContext());
         EPTerm::displayPager($this->getContext());
     } else {
         $this->getOutput()->redirect(SpecialPage::getTitleFor('Term', $this->subPage)->getLocalURL());
     }
 }
 /**
  * Main method.
  *
  * @since 0.1
  *
  * @param string $subPage
  */
 public function execute($subPage)
 {
     parent::execute($subPage);
     $out = $this->getOutput();
     if (trim($subPage) === '') {
         $this->getOutput()->redirect(SpecialPage::getTitleFor('Terms')->getLocalURL());
     } else {
         $out->setPageTitle(wfMsgExt('ep-term-title', 'parsemag', $this->subPage));
         $term = EPTerm::selectRow(null, array('id' => $this->subPage));
         if ($term === false) {
             $this->displayNavigation();
             if ($this->getUser()->isAllowed('ep-term')) {
                 $out->addWikiMsg('ep-term-create', $this->subPage);
                 EPTerm::displayAddNewRegion($this->getContext(), array('id' => $this->subPage));
             } else {
                 $out->addWikiMsg('ep-term-none', $this->subPage);
             }
         } else {
             $links = array();
             if ($this->getUser()->isAllowed('ep-term')) {
                 $links[wfMsg('ep-term-nav-edit')] = SpecialPage::getTitleFor('EditTerm', $this->subPage);
             }
             $this->displayNavigation($links);
             $this->displaySummary($term);
             $out->addHTML(Html::element('h2', array(), wfMsg('ep-term-description')));
             $out->addHTML($this->getOutput()->parse($term->getField('description')));
             $studentIds = array_map(function (EPStudent $student) {
                 return $student->getId();
             }, $term->getStudents('id'));
             if (count($studentIds) > 0) {
                 $out->addHTML(Html::element('h2', array(), wfMsg('ep-term-students')));
                 EPStudent::displayPager($this->getContext(), array('id' => $studentIds));
             } else {
                 // TODO
             }
         }
     }
 }