SpecialTrackingCategories.php

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

    private static $coreTrackingCategories = [
        'index-category',
        'noindex-category',
        'duplicate-args-category',
        'expensive-parserfunction-category',
        'post-expand-template-argument-category',
        'post-expand-template-inclusion-category',
        'hidden-category-category',
        'broken-file-category',
        'node-count-exceeded-category',
        'expansion-depth-exceeded-category',
    ];

    function execute( $par ) {
        $this->setHeaders();
        $this->outputHeader();
        $this->getOutput()->allowClickjacking();
        $this->getOutput()->addHTML(
            Html::openElement( 'table', [ 'class' => 'mw-datatable',
                '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 = $this->prepareTrackingCategoriesData();

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

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

            $catMsgTitleText = Linker::link(
                $data['msg'],
                htmlspecialchars( $catMsg )
            );

            foreach ( $data['cats'] as $catTitle ) {
                $catTitleText = Linker::link(
                    $catTitle,
                    htmlspecialchars( $catTitle->getText() )
                );
                $allMsgs[] = $catTitleText;
            }

            # Extra message, when no category was found
            if ( !count( $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' ) );
    }

    private function prepareTrackingCategoriesData() {
        $categories = array_merge(
            self::$coreTrackingCategories,
            ExtensionRegistry::getInstance()->getAttribute( 'TrackingCategories' ),
            $this->getConfig()->get( 'TrackingCategories' ) // deprecated
        );
        $trackingCategories = [];
        foreach ( $categories as $catMsg ) {
            /*
             * Check if the tracking category varies by namespace
             * Otherwise only pages in the current namespace will be displayed
             * If it does vary, show pages considering all namespaces
             */
            $msgObj = $this->msg( $catMsg )->inContentLanguage();
            $allCats = [];
            $catMsgTitle = Title::makeTitleSafe( NS_MEDIAWIKI, $catMsg );
            if ( !$catMsgTitle ) {
                continue;
            }

            // Match things like {{NAMESPACE}} and {{NAMESPACENUMBER}}.
            // False positives are ok, this is just an efficiency shortcut
            if ( strpos( $msgObj->plain(), '{{' ) !== false ) {
                $ns = MWNamespace::getValidNamespaces();
                foreach ( $ns as $namesp ) {
                    $tempTitle = Title::makeTitleSafe( $namesp, $catMsg );
                    if ( !$tempTitle ) {
                        continue;
                    }
                    $catName = $msgObj->title( $tempTitle )->text();
                    # Allow tracking categories to be disabled by setting them to "-"
                    if ( $catName !== '-' ) {
                        $catTitle = Title::makeTitleSafe( NS_CATEGORY, $catName );
                        if ( $catTitle ) {
                            $allCats[] = $catTitle;
                        }
                    }
                }
            } else {
                $catName = $msgObj->text();
                # Allow tracking categories to be disabled by setting them to "-"
                if ( $catName !== '-' ) {
                    $catTitle = Title::makeTitleSafe( NS_CATEGORY, $catName );
                    if ( $catTitle ) {
                        $allCats[] = $catTitle;
                    }
                }
            }
            $trackingCategories[$catMsg] = [
                'cats' => $allCats,
                'msg' => $catMsgTitle,
            ];
        }

        return $trackingCategories;
    }

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