SpecialUnusedTemplates.php

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<?php
class SpecialUnusedTemplates extends QueryPage {
    public function __construct( $name = 'Unusedtemplates' ) {
        parent::__construct( $name );
    }
 
    public function isExpensive() {
        return true;
    }
 
    public function isSyndicated() {
        return false;
    }
 
    protected function sortDescending() {
        return false;
    }
 
    protected function getOrderFields() {
        return [ 'title' ];
    }
 
    public function getQueryInfo() {
        return [
            'tables' => [ 'page', 'templatelinks' ],
            'fields' => [
                'namespace' => 'page_namespace',
                'title' => 'page_title',
            ],
            'conds' => [
                'page_namespace' => NS_TEMPLATE,
                'tl_from IS NULL',
                'page_is_redirect' => 0
            ],
            'join_conds' => [ 'templatelinks' => [
                'LEFT JOIN', [ 'tl_title = page_title',
                    'tl_namespace = page_namespace' ] ] ]
        ];
    }
 
    public function formatResult( $skin, $result ) {
        $linkRenderer = $this->getLinkRenderer();
        $title = Title::makeTitle( NS_TEMPLATE, $result->title );
        $pageLink = $linkRenderer->makeKnownLink(
            $title,
            null,
            [],
            [ 'redirect' => 'no' ]
        );
        $wlhLink = $linkRenderer->makeKnownLink(
            SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() ),
            $this->msg( 'unusedtemplateswlh' )->text()
        );
 
        return $this->getLanguage()->specialList( $pageLink, $wlhLink );
    }
 
    protected function getPageHeader() {
        return $this->msg( 'unusedtemplatestext' )->parseAsBlock();
    }
 
    protected function getGroupName() {
        return 'maintenance';
    }
}