SpecialTrackingCategories.php

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<?php
class SpecialTrackingCategories extends SpecialPage {
    function __construct() {
        parent::__construct( 'TrackingCategories' );
    }

    function execute( $par ) {
        $this->setHeaders();
        $this->outputHeader();
        $this->getOutput()->allowClickjacking();
        $this->getOutput()->addModuleStyles( 'jquery.tablesorter.styles' );
        $this->getOutput()->addModules( 'jquery.tablesorter' );
        $this->getOutput()->addHTML(
            Html::openElement( 'table', [ 'class' => 'mw-datatable sortable',
                'id' => 'mw-trackingcategories-table' ] ) . "\n" .
            "<thead><tr>
            <th>" .
                $this->msg( 'trackingcategories-msg' )->escaped() . "
            </th>
            <th>" .
                $this->msg( 'trackingcategories-name' )->escaped() .
            "</th>
            <th>" .
                $this->msg( 'trackingcategories-desc' )->escaped() . "
            </th>
            </tr></thead>"
        );

        $trackingCategories = new TrackingCategories( $this->getConfig() );
        $categoryList = $trackingCategories->getTrackingCategories();

        $batch = new LinkBatch();
        foreach ( $categoryList as $catMsg => $data ) {
            $batch->addObj( $data['msg'] );
            foreach ( $data['cats'] as $catTitle ) {
                $batch->addObj( $catTitle );
            }
        }
        $batch->execute();

        Hooks::run( 'SpecialTrackingCategories::preprocess', [ $this, $categoryList ] );

        $linkRenderer = $this->getLinkRenderer();

        foreach ( $categoryList as $catMsg => $data ) {
            $allMsgs = [];
            $catDesc = $catMsg . '-desc';

            $catMsgTitleText = $linkRenderer->makeLink(
                $data['msg'],
                $catMsg
            );

            foreach ( $data['cats'] as $catTitle ) {
                $html = $linkRenderer->makeLink(
                    $catTitle,
                    $catTitle->getText()
                );

                Hooks::run( 'SpecialTrackingCategories::generateCatLink',
                    [ $this, $catTitle, &$html ] );

                $allMsgs[] = $html;
            }

            # Extra message, when no category was found
            if ( $allMsgs === [] ) {
                $allMsgs[] = $this->msg( 'trackingcategories-disabled' )->parse();
            }

            /*
             * Show category description if it exists as a system message
             * as category-name-desc
             */
            $descMsg = $this->msg( $catDesc );
            if ( $descMsg->isBlank() ) {
                $descMsg = $this->msg( 'trackingcategories-nodesc' );
            }

            $this->getOutput()->addHTML(
                Html::openElement( 'tr' ) .
                Html::openElement( 'td', [ 'class' => 'mw-trackingcategories-name' ] ) .
                    $this->getLanguage()->commaList( array_unique( $allMsgs ) ) .
                Html::closeElement( 'td' ) .
                Html::openElement( 'td', [ 'class' => 'mw-trackingcategories-msg' ] ) .
                    $catMsgTitleText .
                Html::closeElement( 'td' ) .
                Html::openElement( 'td', [ 'class' => 'mw-trackingcategories-desc' ] ) .
                    $descMsg->parse() .
                Html::closeElement( 'td' ) .
                Html::closeElement( 'tr' )
            );
        }
        $this->getOutput()->addHTML( Html::closeElement( 'table' ) );
    }

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