undelete.php

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<?php
require_once( dirname( __FILE__ ) . '/Maintenance.php' );

class Undelete extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "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', 'Command line script' );
                $reason = $this->getOption( 'reason', '' );
                $pageName = $this->getArg();

                $title = Title::newFromText( $pageName );
                if ( !$title ) {
                        $this->error( "Invalid title", true );
                }
                $wgUser = User::newFromName( $user );
                if ( !$wgUser ) {
                        $this->error( "Invalid username", true );
                }
                $archive = new PageArchive( $title );
                $this->output( "Undeleting " . $title->getPrefixedDBkey() . '...' );
                $archive->undelete( array(), $reason );
                $this->output( "done\n" );
        }
}

$maintClass = "Undelete";
require_once( RUN_MAINTENANCE_IF_MAIN );