SpecialUnusedtemplates.php

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<?php
class UnusedtemplatesPage extends QueryPage {

        function __construct( $name = 'Unusedtemplates' ) {
                parent::__construct( $name );
        }

        function isExpensive() {
                return true;
        }

        function isSyndicated() {
                return false;
        }

        function sortDescending() {
                return false;
        }

        function getQueryInfo() {
                return array (
                        'tables' => array ( 'page', 'templatelinks' ),
                        'fields' => array ( 'namespace' => 'page_namespace',
                                        'title' => 'page_title',
                                        'value' => 'page_title' ),
                        'conds' => array ( 'page_namespace' => NS_TEMPLATE,
                                        'tl_from IS NULL',
                                        'page_is_redirect' => 0 ),
                        'join_conds' => array ( 'templatelinks' => array (
                                'LEFT JOIN', array ( 'tl_title = page_title',
                                        'tl_namespace = page_namespace' ) ) )
                );
        }

        function formatResult( $skin, $result ) {
                $title = Title::makeTitle( NS_TEMPLATE, $result->title );
                $pageLink = Linker::linkKnown(
                        $title,
                        null,
                        array(),
                        array( 'redirect' => 'no' )
                );
                $wlhLink = Linker::linkKnown(
                        SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() ),
                        $this->msg( 'unusedtemplateswlh' )->escaped()
                );
                return $this->getLanguage()->specialList( $pageLink, $wlhLink );
        }

        function getPageHeader() {
                return $this->msg( 'unusedtemplatestext' )->parseAsBlock();
        }

        protected function getGroupName() {
                return 'maintenance';
        }
}