SpecialMovepage.php

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<?php
use MediaWiki\MediaWikiServices;

class MovePageForm extends UnlistedSpecialPage {
    protected $oldTitle = null;

    protected $newTitle;

    protected $reason;

    // Checks

    protected $moveTalk;

    protected $deleteAndMove;

    protected $moveSubpages;

    protected $fixRedirects;

    protected $leaveRedirect;

    protected $moveOverShared;

    private $watch = false;

    public function __construct() {
        parent::__construct( 'Movepage' );
    }

    public function doesWrites() {
        return true;
    }

    public function execute( $par ) {
        $this->useTransactionalTimeLimit();

        $this->checkReadOnly();

        $this->setHeaders();
        $this->outputHeader();

        $request = $this->getRequest();
        $target = $par ?? $request->getVal( 'target' );

        // Yes, the use of getVal() and getText() is wanted, see T22365

        $oldTitleText = $request->getVal( 'wpOldTitle', $target );
        $this->oldTitle = Title::newFromText( $oldTitleText );

        if ( !$this->oldTitle ) {
            // Either oldTitle wasn't passed, or newFromText returned null
            throw new ErrorPageError( 'notargettitle', 'notargettext' );
        }
        if ( !$this->oldTitle->exists() ) {
            throw new ErrorPageError( 'nopagetitle', 'nopagetext' );
        }

        $newTitleTextMain = $request->getText( 'wpNewTitleMain' );
        $newTitleTextNs = $request->getInt( 'wpNewTitleNs', $this->oldTitle->getNamespace() );
        // Backwards compatibility for forms submitting here from other sources
        // which is more common than it should be..
        $newTitleText_bc = $request->getText( 'wpNewTitle' );
        $this->newTitle = strlen( $newTitleText_bc ) > 0
            ? Title::newFromText( $newTitleText_bc )
            : Title::makeTitleSafe( $newTitleTextNs, $newTitleTextMain );

        $user = $this->getUser();

        # Check rights
        $permErrors = $this->oldTitle->getUserPermissionsErrors( 'move', $user );
        if ( count( $permErrors ) ) {
            // Auto-block user's IP if the account was "hard" blocked
            DeferredUpdates::addCallableUpdate( function () use ( $user ) {
                $user->spreadAnyEditBlock();
            } );
            throw new PermissionsError( 'move', $permErrors );
        }

        $def = !$request->wasPosted();

        $this->reason = $request->getText( 'wpReason' );
        $this->moveTalk = $request->getBool( 'wpMovetalk', $def );
        $this->fixRedirects = $request->getBool( 'wpFixRedirects', $def );
        $this->leaveRedirect = $request->getBool( 'wpLeaveRedirect', $def );
        $this->moveSubpages = $request->getBool( 'wpMovesubpages' );
        $this->deleteAndMove = $request->getBool( 'wpDeleteAndMove' );
        $this->moveOverShared = $request->getBool( 'wpMoveOverSharedFile' );
        $this->watch = $request->getCheck( 'wpWatch' ) && $user->isLoggedIn();

        if ( $request->getVal( 'action' ) == 'submit' && $request->wasPosted()
            && $user->matchEditToken( $request->getVal( 'wpEditToken' ) )
        ) {
            $this->doSubmit();
        } else {
            $this->showForm( [] );
        }
    }

    function showForm( $err, $isPermError = false ) {
        $this->getSkin()->setRelevantTitle( $this->oldTitle );

        $out = $this->getOutput();
        $out->setPageTitle( $this->msg( 'move-page', $this->oldTitle->getPrefixedText() ) );
        $out->addModuleStyles( 'mediawiki.special' );
        $out->addModules( 'mediawiki.misc-authed-ooui' );
        $this->addHelpLink( 'Help:Moving a page' );

        $handlerSupportsRedirects = ContentHandler::getForTitle( $this->oldTitle )
            ->supportsRedirects();

        if ( $this->getConfig()->get( 'FixDoubleRedirects' ) ) {
            $out->addWikiMsg( 'movepagetext' );
        } else {
            $out->addWikiMsg( $handlerSupportsRedirects ?
                'movepagetext-noredirectfixer' :
                'movepagetext-noredirectsupport' );
        }

        if ( $this->oldTitle->getNamespace() == NS_USER && !$this->oldTitle->isSubpage() ) {
            $out->wrapWikiMsg(
                "<div class=\"warningbox mw-moveuserpage-warning\">\n$1\n</div>",
                'moveuserpage-warning'
            );
        } elseif ( $this->oldTitle->getNamespace() == NS_CATEGORY ) {
            $out->wrapWikiMsg(
                "<div class=\"warningbox mw-movecategorypage-warning\">\n$1\n</div>",
                'movecategorypage-warning'
            );
        }

        $deleteAndMove = false;
        $moveOverShared = false;

        $user = $this->getUser();

        $newTitle = $this->newTitle;

        if ( !$newTitle ) {
            # Show the current title as a default
            # when the form is first opened.
            $newTitle = $this->oldTitle;
        } elseif ( !count( $err ) ) {
            # If a title was supplied, probably from the move log revert
            # link, check for validity. We can then show some diagnostic
            # information and save a click.
            $mp = new MovePage( $this->oldTitle, $newTitle );
            $status = $mp->isValidMove();
            $status->merge( $mp->checkPermissions( $user, null ) );
            if ( $status->getErrors() ) {
                $err = $status->getErrorsArray();
            }
        }

        if ( count( $err ) == 1 && isset( $err[0][0] ) && $err[0][0] == 'articleexists'
            && $newTitle->quickUserCan( 'delete', $user )
        ) {
            $out->wrapWikiMsg(
                "<div class='warningbox'>\n$1\n</div>\n",
                [ 'delete_and_move_text', $newTitle->getPrefixedText() ]
            );
            $deleteAndMove = true;
            $err = [];
        }

        if ( count( $err ) == 1 && isset( $err[0][0] ) && $err[0][0] == 'file-exists-sharedrepo'
            && $user->isAllowed( 'reupload-shared' )
        ) {
            $out->wrapWikiMsg(
                "<div class='warningbox'>\n$1\n</div>\n",
                [
                    'move-over-sharedrepo',
                    $newTitle->getPrefixedText()
                ]
            );
            $moveOverShared = true;
            $err = [];
        }

        $oldTalk = $this->oldTitle->getTalkPage();
        $oldTitleSubpages = $this->oldTitle->hasSubpages();
        $oldTitleTalkSubpages = $this->oldTitle->getTalkPage()->hasSubpages();

        $canMoveSubpage = ( $oldTitleSubpages || $oldTitleTalkSubpages ) &&
            !count( $this->oldTitle->getUserPermissionsErrors( 'move-subpages', $user ) );

        # We also want to be able to move assoc. subpage talk-pages even if base page
        # has no associated talk page, so || with $oldTitleTalkSubpages.
        $considerTalk = !$this->oldTitle->isTalkPage() &&
            ( $oldTalk->exists()
                || ( $oldTitleTalkSubpages && $canMoveSubpage ) );

        $dbr = wfGetDB( DB_REPLICA );
        if ( $this->getConfig()->get( 'FixDoubleRedirects' ) ) {
            $hasRedirects = $dbr->selectField( 'redirect', '1',
                [
                    'rd_namespace' => $this->oldTitle->getNamespace(),
                    'rd_title' => $this->oldTitle->getDBkey(),
                ], __METHOD__ );
        } else {
            $hasRedirects = false;
        }

        if ( count( $err ) ) {
            if ( $isPermError ) {
                $action_desc = $this->msg( 'action-move' )->plain();
                $errMsgHtml = $this->msg( 'permissionserrorstext-withaction',
                    count( $err ), $action_desc )->parseAsBlock();
            } else {
                $errMsgHtml = $this->msg( 'cannotmove', count( $err ) )->parseAsBlock();
            }

            if ( count( $err ) == 1 ) {
                $errMsg = $err[0];
                $errMsgName = array_shift( $errMsg );

                if ( $errMsgName == 'hookaborted' ) {
                    $errMsgHtml .= "<p>{$errMsg[0]}</p>\n";
                } else {
                    $errMsgHtml .= $this->msg( $errMsgName, $errMsg )->parseAsBlock();
                }
            } else {
                $errStr = [];

                foreach ( $err as $errMsg ) {
                    if ( $errMsg[0] == 'hookaborted' ) {
                        $errStr[] = $errMsg[1];
                    } else {
                        $errMsgName = array_shift( $errMsg );
                        $errStr[] = $this->msg( $errMsgName, $errMsg )->parse();
                    }
                }

                $errMsgHtml .= '<ul><li>' . implode( "</li>\n<li>", $errStr ) . "</li></ul>\n";
            }
            $out->addHTML( Html::errorBox( $errMsgHtml ) );
        }

        if ( $this->oldTitle->isProtected( 'move' ) ) {
            # Is the title semi-protected?
            if ( $this->oldTitle->isSemiProtected( 'move' ) ) {
                $noticeMsg = 'semiprotectedpagemovewarning';
                $classes[] = 'mw-textarea-sprotected';
            } else {
                # Then it must be protected based on static groups (regular)
                $noticeMsg = 'protectedpagemovewarning';
                $classes[] = 'mw-textarea-protected';
            }
            $out->addHTML( "<div class='mw-warning-with-logexcerpt'>\n" );
            $out->addWikiMsg( $noticeMsg );
            LogEventsList::showLogExtract(
                $out,
                'protect',
                $this->oldTitle,
                '',
                [ 'lim' => 1 ]
            );
            $out->addHTML( "</div>\n" );
        }

        // Length limit for wpReason and wpNewTitleMain is enforced in the
        // mediawiki.special.movePage module

        $immovableNamespaces = [];
        foreach ( array_keys( $this->getLanguage()->getNamespaces() ) as $nsId ) {
            if ( !MediaWikiServices::getInstance()->getNamespaceInfo()->isMovable( $nsId ) ) {
                $immovableNamespaces[] = $nsId;
            }
        }

        $out->enableOOUI();
        $fields = [];

        $fields[] = new OOUI\FieldLayout(
            new MediaWiki\Widget\ComplexTitleInputWidget( [
                'id' => 'wpNewTitle',
                'namespace' => [
                    'id' => 'wpNewTitleNs',
                    'name' => 'wpNewTitleNs',
                    'value' => $newTitle->getNamespace(),
                    'exclude' => $immovableNamespaces,
                ],
                'title' => [
                    'id' => 'wpNewTitleMain',
                    'name' => 'wpNewTitleMain',
                    'value' => $newTitle->getText(),
                    // Inappropriate, since we're expecting the user to input a non-existent page's title
                    'suggestions' => false,
                ],
                'infusable' => true,
            ] ),
            [
                'label' => $this->msg( 'newtitle' )->text(),
                'align' => 'top',
            ]
        );

        // HTML maxlength uses "UTF-16 code units", which means that characters outside BMP
        // (e.g. emojis) count for two each. This limit is overridden in JS to instead count
        // Unicode codepoints.
        $fields[] = new OOUI\FieldLayout(
            new OOUI\TextInputWidget( [
                'name' => 'wpReason',
                'id' => 'wpReason',
                'maxLength' => CommentStore::COMMENT_CHARACTER_LIMIT,
                'infusable' => true,
                'value' => $this->reason,
            ] ),
            [
                'label' => $this->msg( 'movereason' )->text(),
                'align' => 'top',
            ]
        );

        if ( $considerTalk ) {
            $fields[] = new OOUI\FieldLayout(
                new OOUI\CheckboxInputWidget( [
                    'name' => 'wpMovetalk',
                    'id' => 'wpMovetalk',
                    'value' => '1',
                    'selected' => $this->moveTalk,
                ] ),
                [
                    'label' => $this->msg( 'movetalk' )->text(),
                    'help' => new OOUI\HtmlSnippet( $this->msg( 'movepagetalktext' )->parseAsBlock() ),
                    'helpInline' => true,
                    'align' => 'inline',
                    'id' => 'wpMovetalk-field',
                ]
            );
        }

        if ( $user->isAllowed( 'suppressredirect' ) ) {
            if ( $handlerSupportsRedirects ) {
                $isChecked = $this->leaveRedirect;
                $isDisabled = false;
            } else {
                $isChecked = false;
                $isDisabled = true;
            }
            $fields[] = new OOUI\FieldLayout(
                new OOUI\CheckboxInputWidget( [
                    'name' => 'wpLeaveRedirect',
                    'id' => 'wpLeaveRedirect',
                    'value' => '1',
                    'selected' => $isChecked,
                    'disabled' => $isDisabled,
                ] ),
                [
                    'label' => $this->msg( 'move-leave-redirect' )->text(),
                    'align' => 'inline',
                ]
            );
        }

        if ( $hasRedirects ) {
            $fields[] = new OOUI\FieldLayout(
                new OOUI\CheckboxInputWidget( [
                    'name' => 'wpFixRedirects',
                    'id' => 'wpFixRedirects',
                    'value' => '1',
                    'selected' => $this->fixRedirects,
                ] ),
                [
                    'label' => $this->msg( 'fix-double-redirects' )->text(),
                    'align' => 'inline',
                ]
            );
        }

        if ( $canMoveSubpage ) {
            $maximumMovedPages = $this->getConfig()->get( 'MaximumMovedPages' );
            $fields[] = new OOUI\FieldLayout(
                new OOUI\CheckboxInputWidget( [
                    'name' => 'wpMovesubpages',
                    'id' => 'wpMovesubpages',
                    'value' => '1',
                    # Don't check the box if we only have talk subpages to
                    # move and we aren't moving the talk page.
                    'selected' => $this->moveSubpages && ( $this->oldTitle->hasSubpages() || $this->moveTalk ),
                ] ),
                [
                    'label' => new OOUI\HtmlSnippet(
                        $this->msg(
                            ( $this->oldTitle->hasSubpages()
                                ? 'move-subpages'
                                : 'move-talk-subpages' )
                        )->numParams( $maximumMovedPages )->params( $maximumMovedPages )->parse()
                    ),
                    'align' => 'inline',
                ]
            );
        }

        # Don't allow watching if user is not logged in
        if ( $user->isLoggedIn() ) {
            $watchChecked = $user->isLoggedIn() && ( $this->watch || $user->getBoolOption( 'watchmoves' )
                || $user->isWatched( $this->oldTitle ) );
            $fields[] = new OOUI\FieldLayout(
                new OOUI\CheckboxInputWidget( [
                    'name' => 'wpWatch',
                    'id' => 'watch', # ew
                    'value' => '1',
                    'selected' => $watchChecked,
                ] ),
                [
                    'label' => $this->msg( 'move-watch' )->text(),
                    'align' => 'inline',
                ]
            );
        }

        $hiddenFields = '';
        if ( $moveOverShared ) {
            $hiddenFields .= Html::hidden( 'wpMoveOverSharedFile', '1' );
        }

        if ( $deleteAndMove ) {
            $fields[] = new OOUI\FieldLayout(
                new OOUI\CheckboxInputWidget( [
                    'name' => 'wpDeleteAndMove',
                    'id' => 'wpDeleteAndMove',
                    'value' => '1',
                ] ),
                [
                    'label' => $this->msg( 'delete_and_move_confirm' )->text(),
                    'align' => 'inline',
                ]
            );
        }

        $fields[] = new OOUI\FieldLayout(
            new OOUI\ButtonInputWidget( [
                'name' => 'wpMove',
                'value' => $this->msg( 'movepagebtn' )->text(),
                'label' => $this->msg( 'movepagebtn' )->text(),
                'flags' => [ 'primary', 'progressive' ],
                'type' => 'submit',
            ] ),
            [
                'align' => 'top',
            ]
        );

        $fieldset = new OOUI\FieldsetLayout( [
            'label' => $this->msg( 'move-page-legend' )->text(),
            'id' => 'mw-movepage-table',
            'items' => $fields,
        ] );

        $form = new OOUI\FormLayout( [
            'method' => 'post',
            'action' => $this->getPageTitle()->getLocalURL( 'action=submit' ),
            'id' => 'movepage',
        ] );
        $form->appendContent(
            $fieldset,
            new OOUI\HtmlSnippet(
                $hiddenFields .
                Html::hidden( 'wpOldTitle', $this->oldTitle->getPrefixedText() ) .
                Html::hidden( 'wpEditToken', $user->getEditToken() )
            )
        );

        $out->addHTML(
            new OOUI\PanelLayout( [
                'classes' => [ 'movepage-wrapper' ],
                'expanded' => false,
                'padded' => true,
                'framed' => true,
                'content' => $form,
            ] )
        );

        $this->showLogFragment( $this->oldTitle );
        $this->showSubpages( $this->oldTitle );
    }

    function doSubmit() {
        $user = $this->getUser();

        if ( $user->pingLimiter( 'move' ) ) {
            throw new ThrottledError;
        }

        $ot = $this->oldTitle;
        $nt = $this->newTitle;

        # don't allow moving to pages with # in
        if ( !$nt || $nt->hasFragment() ) {
            $this->showForm( [ [ 'badtitletext' ] ] );

            return;
        }

        # Show a warning if the target file exists on a shared repo
        if ( $nt->getNamespace() == NS_FILE
            && !( $this->moveOverShared && $user->isAllowed( 'reupload-shared' ) )
            && !RepoGroup::singleton()->getLocalRepo()->findFile( $nt )
            && MediaWikiServices::getInstance()->getRepoGroup()->findFile( $nt )
        ) {
            $this->showForm( [ [ 'file-exists-sharedrepo' ] ] );

            return;
        }

        # Delete to make way if requested
        if ( $this->deleteAndMove ) {
            $permErrors = $nt->getUserPermissionsErrors( 'delete', $user );
            if ( count( $permErrors ) ) {
                # Only show the first error
                $this->showForm( $permErrors, true );

                return;
            }

            $page = WikiPage::factory( $nt );

            // Small safety margin to guard against concurrent edits
            if ( $page->isBatchedDelete( 5 ) ) {
                $this->showForm( [ [ 'movepage-delete-first' ] ] );

                return;
            }

            $reason = $this->msg( 'delete_and_move_reason', $ot )->inContentLanguage()->text();

            // Delete an associated image if there is
            if ( $nt->getNamespace() == NS_FILE ) {
                $file = MediaWikiServices::getInstance()->getRepoGroup()->getLocalRepo()
                    ->newFile( $nt );
                $file->load( File::READ_LATEST );
                if ( $file->exists() ) {
                    $file->delete( $reason, false, $user );
                }
            }

            $error = ''; // passed by ref
            $deleteStatus = $page->doDeleteArticleReal( $reason, false, 0, true, $error, $user );
            if ( !$deleteStatus->isGood() ) {
                $this->showForm( $deleteStatus->getErrorsArray() );

                return;
            }
        }

        $handler = ContentHandler::getForTitle( $ot );

        if ( !$handler->supportsRedirects() ) {
            $createRedirect = false;
        } elseif ( $user->isAllowed( 'suppressredirect' ) ) {
            $createRedirect = $this->leaveRedirect;
        } else {
            $createRedirect = true;
        }

        # Do the actual move.
        $mp = new MovePage( $ot, $nt );

        # check whether the requested actions are permitted / possible
        $userPermitted = $mp->checkPermissions( $user, $this->reason )->isOK();
        if ( $ot->isTalkPage() || $nt->isTalkPage() ) {
            $this->moveTalk = false;
        }
        if ( $this->moveSubpages ) {
            $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
            $this->moveSubpages = $permissionManager->userCan( 'move-subpages', $user, $ot );
        }

        $status = $mp->moveIfAllowed( $user, $this->reason, $createRedirect );
        if ( !$status->isOK() ) {
            $this->showForm( $status->getErrorsArray(), !$userPermitted );
            return;
        }

        if ( $this->getConfig()->get( 'FixDoubleRedirects' ) && $this->fixRedirects ) {
            DoubleRedirectJob::fixRedirects( 'move', $ot, $nt );
        }

        $out = $this->getOutput();
        $out->setPageTitle( $this->msg( 'pagemovedsub' ) );

        $linkRenderer = $this->getLinkRenderer();
        $oldLink = $linkRenderer->makeLink(
            $ot,
            null,
            [ 'id' => 'movepage-oldlink' ],
            [ 'redirect' => 'no' ]
        );
        $newLink = $linkRenderer->makeKnownLink(
            $nt,
            null,
            [ 'id' => 'movepage-newlink' ]
        );
        $oldText = $ot->getPrefixedText();
        $newText = $nt->getPrefixedText();

        if ( $ot->exists() ) {
            // NOTE: we assume that if the old title exists, it's because it was re-created as
            // a redirect to the new title. This is not safe, but what we did before was
            // even worse: we just determined whether a redirect should have been created,
            // and reported that it was created if it should have, without any checks.
            // Also note that isRedirect() is unreliable because of T39209.
            $msgName = 'movepage-moved-redirect';
        } else {
            $msgName = 'movepage-moved-noredirect';
        }

        $out->addHTML( $this->msg( 'movepage-moved' )->rawParams( $oldLink,
            $newLink )->params( $oldText, $newText )->parseAsBlock() );
        $out->addWikiMsg( $msgName );

        // Avoid PHP 7.1 warning from passing $this by reference
        $movePage = $this;
        Hooks::run( 'SpecialMovepageAfterMove', [ &$movePage, &$ot, &$nt ] );

        /*
         * Now we move extra pages we've been asked to move: subpages and talk
         * pages.
         *
         * First, make a list of id's.  This might be marginally less efficient
         * than a more direct method, but this is not a highly performance-cri-
         * tical code path and readable code is more important here.
         *
         * If the target namespace doesn't allow subpages, moving with subpages
         * would mean that you couldn't move them back in one operation, which
         * is bad.
         * @todo FIXME: A specific error message should be given in this case.
         */

        // @todo FIXME: Use Title::moveSubpages() here
        $nsInfo = MediaWikiServices::getInstance()->getNamespaceInfo();
        $dbr = wfGetDB( DB_MASTER );
        if ( $this->moveSubpages && (
            $nsInfo->hasSubpages( $nt->getNamespace() ) || (
                $this->moveTalk
                    && $nsInfo->hasSubpages( $nt->getTalkPage()->getNamespace() )
            )
        ) ) {
            $conds = [
                'page_title' . $dbr->buildLike( $ot->getDBkey() . '/', $dbr->anyString() )
                    . ' OR page_title = ' . $dbr->addQuotes( $ot->getDBkey() )
            ];
            $conds['page_namespace'] = [];
            if ( $nsInfo->hasSubpages( $nt->getNamespace() ) ) {
                $conds['page_namespace'][] = $ot->getNamespace();
            }
            if ( $this->moveTalk &&
                $nsInfo->hasSubpages( $nt->getTalkPage()->getNamespace() )
            ) {
                $conds['page_namespace'][] = $ot->getTalkPage()->getNamespace();
            }
        } elseif ( $this->moveTalk ) {
            $conds = [
                'page_namespace' => $ot->getTalkPage()->getNamespace(),
                'page_title' => $ot->getDBkey()
            ];
        } else {
            # Skip the query
            $conds = null;
        }

        $extraPages = [];
        if ( !is_null( $conds ) ) {
            $extraPages = TitleArray::newFromResult(
                $dbr->select( 'page',
                    [ 'page_id', 'page_namespace', 'page_title' ],
                    $conds,
                    __METHOD__
                )
            );
        }

        $extraOutput = [];
        $count = 1;
        foreach ( $extraPages as $oldSubpage ) {
            if ( $ot->equals( $oldSubpage ) || $nt->equals( $oldSubpage ) ) {
                # Already did this one.
                continue;
            }

            $newPageName = preg_replace(
                '#^' . preg_quote( $ot->getDBkey(), '#' ) . '#',
                StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # T23234
                $oldSubpage->getDBkey()
            );

            if ( $oldSubpage->isSubpage() && ( $ot->isTalkPage() xor $nt->isTalkPage() ) ) {
                // Moving a subpage from a subject namespace to a talk namespace or vice-versa
                $newNs = $nt->getNamespace();
            } elseif ( $oldSubpage->isTalkPage() ) {
                $newNs = $nt->getTalkPage()->getNamespace();
            } else {
                $newNs = $nt->getSubjectPage()->getNamespace();
            }

            # T16385: we need makeTitleSafe because the new page names may
            # be longer than 255 characters.
            $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
            if ( !$newSubpage ) {
                $oldLink = $linkRenderer->makeKnownLink( $oldSubpage );
                $extraOutput[] = $this->msg( 'movepage-page-unmoved' )->rawParams( $oldLink )
                    ->params( Title::makeName( $newNs, $newPageName ) )->escaped();
                continue;
            }

            $mp = new MovePage( $oldSubpage, $newSubpage );
            # This was copy-pasted from Renameuser, bleh.
            if ( $newSubpage->exists() && !$mp->isValidMove()->isOk() ) {
                $link = $linkRenderer->makeKnownLink( $newSubpage );
                $extraOutput[] = $this->msg( 'movepage-page-exists' )->rawParams( $link )->escaped();
            } else {
                $status = $mp->moveIfAllowed( $user, $this->reason, $createRedirect );

                if ( $status->isOK() ) {
                    if ( $this->fixRedirects ) {
                        DoubleRedirectJob::fixRedirects( 'move', $oldSubpage, $newSubpage );
                    }
                    $oldLink = $linkRenderer->makeLink(
                        $oldSubpage,
                        null,
                        [],
                        [ 'redirect' => 'no' ]
                    );

                    $newLink = $linkRenderer->makeKnownLink( $newSubpage );
                    $extraOutput[] = $this->msg( 'movepage-page-moved' )
                        ->rawParams( $oldLink, $newLink )->escaped();
                    ++$count;

                    $maximumMovedPages = $this->getConfig()->get( 'MaximumMovedPages' );
                    if ( $count >= $maximumMovedPages ) {
                        $extraOutput[] = $this->msg( 'movepage-max-pages' )
                            ->numParams( $maximumMovedPages )->escaped();
                        break;
                    }
                } else {
                    $oldLink = $linkRenderer->makeKnownLink( $oldSubpage );
                    $newLink = $linkRenderer->makeLink( $newSubpage );
                    $extraOutput[] = $this->msg( 'movepage-page-unmoved' )
                        ->rawParams( $oldLink, $newLink )->escaped();
                }
            }
        }

        if ( $extraOutput !== [] ) {
            $out->addHTML( "<ul>\n<li>" . implode( "</li>\n<li>", $extraOutput ) . "</li>\n</ul>" );
        }

        # Deal with watches (we don't watch subpages)
        WatchAction::doWatchOrUnwatch( $this->watch, $ot, $user );
        WatchAction::doWatchOrUnwatch( $this->watch, $nt, $user );
    }

    function showLogFragment( $title ) {
        $moveLogPage = new LogPage( 'move' );
        $out = $this->getOutput();
        $out->addHTML( Xml::element( 'h2', null, $moveLogPage->getName()->text() ) );
        LogEventsList::showLogExtract( $out, 'move', $title );
    }

    function showSubpages( $title ) {
        $nsHasSubpages = MediaWikiServices::getInstance()->getNamespaceInfo()->
            hasSubpages( $title->getNamespace() );
        $subpages = $title->getSubpages();
        $count = $subpages instanceof TitleArray ? $subpages->count() : 0;

        $titleIsTalk = $title->isTalkPage();
        $subpagesTalk = $title->getTalkPage()->getSubpages();
        $countTalk = $subpagesTalk instanceof TitleArray ? $subpagesTalk->count() : 0;
        $totalCount = $count + $countTalk;

        if ( !$nsHasSubpages && $countTalk == 0 ) {
            return;
        }

        $this->getOutput()->wrapWikiMsg(
            '== $1 ==',
            [ 'movesubpage', ( $titleIsTalk ? $count : $totalCount ) ]
        );

        if ( $nsHasSubpages ) {
            $this->showSubpagesList( $subpages, $count, 'movesubpagetext', true );
        }

        if ( !$titleIsTalk && $countTalk > 0 ) {
            $this->showSubpagesList( $subpagesTalk, $countTalk, 'movesubpagetalktext' );
        }
    }

    function showSubpagesList( $subpages, $pagecount, $wikiMsg, $noSubpageMsg = false ) {
        $out = $this->getOutput();

        # No subpages.
        if ( $pagecount == 0 && $noSubpageMsg ) {
            $out->addWikiMsg( 'movenosubpage' );
            return;
        }

        $out->addWikiMsg( $wikiMsg, $this->getLanguage()->formatNum( $pagecount ) );
        $out->addHTML( "<ul>\n" );

        $linkBatch = new LinkBatch( $subpages );
        $linkBatch->setCaller( __METHOD__ );
        $linkBatch->execute();
        $linkRenderer = $this->getLinkRenderer();

        foreach ( $subpages as $subpage ) {
            $link = $linkRenderer->makeLink( $subpage );
            $out->addHTML( "<li>$link</li>\n" );
        }
        $out->addHTML( "</ul>\n" );
    }

    public function prefixSearchSubpages( $search, $limit, $offset ) {
        return $this->prefixSearchString( $search, $limit, $offset );
    }

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