undelete.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class Undelete extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Undelete a page' );
        $this->addOption( 'user', 'The user to perform the undeletion', false, true, 'u' );
        $this->addOption( 'reason', 'The reason to undelete', false, true, 'r' );
        $this->addArg( 'pagename', 'Page to undelete' );
    }

    public function execute() {
        global $wgUser;

        $user = $this->getOption( 'user', false );
        $reason = $this->getOption( 'reason', '' );
        $pageName = $this->getArg();

        $title = Title::newFromText( $pageName );
        if ( !$title ) {
            $this->error( "Invalid title", true );
        }
        if ( $user === false ) {
            $wgUser = User::newSystemUser( 'Command line script', [ 'steal' => true ] );
        } else {
            $wgUser = User::newFromName( $user );
        }
        if ( !$wgUser ) {
            $this->error( "Invalid username", true );
        }
        $archive = new PageArchive( $title, RequestContext::getMain()->getConfig() );
        $this->output( "Undeleting " . $title->getPrefixedDBkey() . '...' );
        $archive->undelete( [], $reason );
        $this->output( "done\n" );
    }
}

$maintClass = "Undelete";
require_once RUN_MAINTENANCE_IF_MAIN;