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';
    }
}