CiteThisPage.hooks.php

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<?php
 
class CiteThisPageHooks {
 
    public static function onSkinTemplateBuildNavUrlsNav_urlsAfterPermalink(
        &$skintemplate, &$nav_urls, &$oldid, &$revid
    ) {
        // check whether we’re in the right namespace, the $revid has the correct type and is not empty
        // (which would mean that the current page doesn’t exist)
        $title = $skintemplate->getTitle();
        if ( self::shouldAddLink( $title ) && $revid !== 0 && !empty( $revid ) ) {
            $nav_urls['citethispage'] = [
                'text' => $skintemplate->msg( 'citethispage-link' )->text(),
                'href' => SpecialPage::getTitleFor( 'CiteThisPage' )
                    ->getLocalURL( [ 'page' => $title->getPrefixedDBkey(), 'id' => $revid ] ),
                'id' => 't-cite',
                # Used message keys: 'tooltip-citethispage', 'accesskey-citethispage'
                'single-id' => 'citethispage',
            ];
        }
 
        return true;
    }
 
    private static function shouldAddLink( Title $title ) {
        global $wgCiteThisPageAdditionalNamespaces;
 
        return $title->isContentPage() ||
            (
                isset( $wgCiteThisPageAdditionalNamespaces[$title->getNamespace()] ) &&
                $wgCiteThisPageAdditionalNamespaces[$title->getNamespace()]
            );
    }
 
    public static function onBaseTemplateToolbox( BaseTemplate $baseTemplate, array &$toolbox ) {
        if ( isset( $baseTemplate->data['nav_urls']['citethispage'] ) ) {
            $toolbox['citethispage'] = $baseTemplate->data['nav_urls']['citethispage'];
        }
 
        return true;
    }
}