InfoAction.php

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<?php
class InfoAction extends FormlessAction {

        public function getName() {
                return 'info';
        }

        protected function getDescription() {
                return '';
        }

        public function requiresWrite() {
                return false;
        }

        public function requiresUnblock() {
                return false;
        }

        protected function getPageTitle() {
                return $this->msg( 'pageinfo-title', $this->getTitle()->getSubjectPage()->getPrefixedText() )->text();
        }

        public function onView() {
                global $wgDisableCounters;

                $title = $this->getTitle()->getSubjectPage();

                $pageInfo = self::pageCountInfo( $title );
                $talkInfo = self::pageCountInfo( $title->getTalkPage() );

                return Html::rawElement( 'table', array( 'class' => 'wikitable mw-page-info' ),
                        Html::rawElement( 'tr', array(),
                                Html::element( 'th', array(), '' ) .
                                Html::element( 'th', array(), $this->msg( 'pageinfo-subjectpage' )->text() ) .
                                Html::element( 'th', array(), $this->msg( 'pageinfo-talkpage' )->text() )
                        ) .
                        Html::rawElement( 'tr', array(),
                                Html::element( 'th', array( 'colspan' => 3 ), $this->msg( 'pageinfo-header-edits' )->text() )
                        ) .
                        Html::rawElement( 'tr', array(),
                                Html::element( 'td', array(), $this->msg( 'pageinfo-edits' )->text() ) .
                                Html::element( 'td', array(), $this->getLanguage()->formatNum( $pageInfo['edits'] ) ) .
                                Html::element( 'td', array(), $this->getLanguage()->formatNum( $talkInfo['edits'] ) )
                        ) .
                        Html::rawElement( 'tr', array(),
                                Html::element( 'td', array(), $this->msg( 'pageinfo-authors' )->text() ) .
                                Html::element( 'td', array(), $this->getLanguage()->formatNum( $pageInfo['authors'] ) ) .
                                Html::element( 'td', array(), $this->getLanguage()->formatNum( $talkInfo['authors'] ) )
                        ) .
                        ( !$this->getUser()->isAllowed( 'unwatchedpages' ) ? '' :
                                Html::rawElement( 'tr', array(),
                                        Html::element( 'th', array( 'colspan' => 3 ), $this->msg( 'pageinfo-header-watchlist' )->text() )
                                ) .
                                Html::rawElement( 'tr', array(),
                                        Html::element( 'td', array(), $this->msg( 'pageinfo-watchers' )->text() ) .
                                        Html::element( 'td', array( 'colspan' => 2 ), $this->getLanguage()->formatNum( $pageInfo['watchers'] ) )
                                )
                        ).
                        ( $wgDisableCounters ? '' :
                                Html::rawElement( 'tr', array(),
                                        Html::element( 'th', array( 'colspan' => 3 ), $this->msg( 'pageinfo-header-views' )->text() )
                                ) .
                                Html::rawElement( 'tr', array(),
                                        Html::element( 'td', array(), $this->msg( 'pageinfo-views' )->text() ) .
                                        Html::element( 'td', array(), $this->getLanguage()->formatNum( $pageInfo['views'] ) ) .
                                        Html::element( 'td', array(), $this->getLanguage()->formatNum( $talkInfo['views'] ) )
                                ) .
                                Html::rawElement( 'tr', array(),
                                        Html::element( 'td', array(), $this->msg( 'pageinfo-viewsperedit' )->text() ) .
                                        Html::element( 'td', array(), $this->getLanguage()->formatNum( sprintf( '%.2f', $pageInfo['edits'] ? $pageInfo['views'] / $pageInfo['edits'] : 0 ) ) ) .
                                        Html::element( 'td', array(), $this->getLanguage()->formatNum( sprintf( '%.2f', $talkInfo['edits'] ? $talkInfo['views'] / $talkInfo['edits'] : 0 ) ) )
                                )
                        )
                );
        }

        public static function pageCountInfo( $title ) {
                $id = $title->getArticleId();
                $dbr = wfGetDB( DB_SLAVE );

                $watchers = (int)$dbr->selectField(
                        'watchlist',
                        'COUNT(*)',
                        array(
                                'wl_title'     => $title->getDBkey(),
                                'wl_namespace' => $title->getNamespace()
                        ),
                        __METHOD__
                );

                $edits = (int)$dbr->selectField(
                        'revision',
                        'COUNT(rev_page)',
                        array( 'rev_page' => $id ),
                        __METHOD__
                );

                $authors = (int)$dbr->selectField(
                        'revision',
                        'COUNT(DISTINCT rev_user_text)',
                        array( 'rev_page' => $id ),
                        __METHOD__
                );

                $views = (int)$dbr->selectField(
                        'page',
                        'page_counter',
                        array( 'page_id' => $id ),
                        __METHOD__
                );

                return array( 'watchers' => $watchers, 'edits' => $edits,
                        'authors' => $authors, 'views' => $views );
        }
}