Merge "Remove not used private member variable mParserWarnings from OutputPage"

[mediawiki.git] / includes / specials / SpecialRecentchanges.php

<?php
/**
 * Implements Special:Recentchanges
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup SpecialPage
 */

/**
 * A special page that lists last changes made to the wiki
 *
 * @ingroup SpecialPage
 */
class SpecialRecentChanges extends ChangesListSpecialPage {
        // @codingStandardsIgnoreStart Needed "useless" override to change parameters.
        public function __construct( $name = 'Recentchanges', $restriction = '' ) {
                parent::__construct( $name, $restriction );
        }
        // @codingStandardsIgnoreEnd

        /**
         * Main execution point
         *
         * @param string $subpage
         */
        public function execute( $subpage ) {
                // Backwards-compatibility: redirect to new feed URLs
                $feedFormat = $this->getRequest()->getVal( 'feed' );
                if ( !$this->including() && $feedFormat ) {
                        $query = $this->getFeedQuery();
                        $query['feedformat'] = $feedFormat === 'atom' ? 'atom' : 'rss';
                        $this->getOutput()->redirect( wfAppendQuery( wfScript( 'api' ), $query ) );

                        return;
                }

                // 10 seconds server-side caching max
                $this->getOutput()->setCdnMaxage( 10 );
                // Check if the client has a cached version
                $lastmod = $this->checkLastModified();
                if ( $lastmod === false ) {
                        return;
                }

                $this->addHelpLink(
                        '//meta.wikimedia.org/wiki/Special:MyLanguage/Help:Recent_changes',
                        true
                );
                parent::execute( $subpage );
        }

        /**
         * Get a FormOptions object containing the default options
         *
         * @return FormOptions
         */
        public function getDefaultOptions() {
                $opts = parent::getDefaultOptions();
                $user = $this->getUser();
                $config = $this->getConfig();

                $opts->add( 'days', $user->getIntOption( 'rcdays' ) );
                $opts->add( 'limit', $user->getIntOption( 'rclimit' ) );
                $opts->add( 'from', '' );

                $opts->add( 'hideminor', $user->getBoolOption( 'hideminor' ) );
                $opts->add( 'hidebots', true );
                $opts->add( 'hideanons', false );
                $opts->add( 'hideliu', false );
                $opts->add( 'hidepatrolled', $user->getBoolOption( 'hidepatrolled' ) );
                $opts->add( 'hidemyself', false );

                if ( $config->get( 'RCWatchCategoryMembership' ) ) {
                        $opts->add( 'hidecategorization', $user->getBoolOption( 'hidecategorization' ) );
                }

                $opts->add( 'categories', '' );
                $opts->add( 'categories_any', false );
                $opts->add( 'tagfilter', '' );

                return $opts;
        }

        /**
         * Get custom show/hide filters
         *
         * @return array Map of filter URL param names to properties (msg/default)
         */
        protected function getCustomFilters() {
                if ( $this->customFilters === null ) {
                        $this->customFilters = parent::getCustomFilters();
                        Hooks::run( 'SpecialRecentChangesFilters', array( $this, &$this->customFilters ), '1.23' );
                }

                return $this->customFilters;
        }

        /**
         * Process $par and put options found in $opts. Used when including the page.
         *
         * @param string $par
         * @param FormOptions $opts
         */
        public function parseParameters( $par, FormOptions $opts ) {
                $bits = preg_split( '/\s*,\s*/', trim( $par ) );
                foreach ( $bits as $bit ) {
                        if ( 'hidebots' === $bit ) {
                                $opts['hidebots'] = true;
                        }
                        if ( 'bots' === $bit ) {
                                $opts['hidebots'] = false;
                        }
                        if ( 'hideminor' === $bit ) {
                                $opts['hideminor'] = true;
                        }
                        if ( 'minor' === $bit ) {
                                $opts['hideminor'] = false;
                        }
                        if ( 'hideliu' === $bit ) {
                                $opts['hideliu'] = true;
                        }
                        if ( 'hidepatrolled' === $bit ) {
                                $opts['hidepatrolled'] = true;
                        }
                        if ( 'hideanons' === $bit ) {
                                $opts['hideanons'] = true;
                        }
                        if ( 'hidemyself' === $bit ) {
                                $opts['hidemyself'] = true;
                        }
                        if ( 'hidecategorization' === $bit ) {
                                $opts['hidecategorization'] = true;
                        }

                        if ( is_numeric( $bit ) ) {
                                $opts['limit'] = $bit;
                        }

                        $m = array();
                        if ( preg_match( '/^limit=(\d+)$/', $bit, $m ) ) {
                                $opts['limit'] = $m[1];
                        }
                        if ( preg_match( '/^days=(\d+)$/', $bit, $m ) ) {
                                $opts['days'] = $m[1];
                        }
                        if ( preg_match( '/^namespace=(\d+)$/', $bit, $m ) ) {
                                $opts['namespace'] = $m[1];
                        }
                }
        }

        public function validateOptions( FormOptions $opts ) {
                $opts->validateIntBounds( 'limit', 0, 5000 );
                parent::validateOptions( $opts );
        }

        /**
         * Return an array of conditions depending of options set in $opts
         *
         * @param FormOptions $opts
         * @return array
         */
        public function buildMainQueryConds( FormOptions $opts ) {
                $dbr = $this->getDB();
                $conds = parent::buildMainQueryConds( $opts );

                // Calculate cutoff
                $cutoff_unixtime = time() - ( $opts['days'] * 86400 );
                $cutoff_unixtime = $cutoff_unixtime - ( $cutoff_unixtime % 86400 );
                $cutoff = $dbr->timestamp( $cutoff_unixtime );

                $fromValid = preg_match( '/^[0-9]{14}$/', $opts['from'] );
                if ( $fromValid && $opts['from'] > wfTimestamp( TS_MW, $cutoff ) ) {
                        $cutoff = $dbr->timestamp( $opts['from'] );
                } else {
                        $opts->reset( 'from' );
                }

                $conds[] = 'rc_timestamp >= ' . $dbr->addQuotes( $cutoff );

                return $conds;
        }

        /**
         * Process the query
         *
         * @param array $conds
         * @param FormOptions $opts
         * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
         */
        public function doMainQuery( $conds, $opts ) {
                $dbr = $this->getDB();
                $user = $this->getUser();

                $tables = array( 'recentchanges' );
                $fields = RecentChange::selectFields();
                $query_options = array();
                $join_conds = array();

                // JOIN on watchlist for users
                if ( $user->getId() && $user->isAllowed( 'viewmywatchlist' ) ) {
                        $tables[] = 'watchlist';
                        $fields[] = 'wl_user';
                        $fields[] = 'wl_notificationtimestamp';
                        $join_conds['watchlist'] = array( 'LEFT JOIN', array(
                                'wl_user' => $user->getId(),
                                'wl_title=rc_title',
                                'wl_namespace=rc_namespace'
                        ) );
                }

                if ( $user->isAllowed( 'rollback' ) ) {
                        $tables[] = 'page';
                        $fields[] = 'page_latest';
                        $join_conds['page'] = array( 'LEFT JOIN', 'rc_cur_id=page_id' );
                }

                ChangeTags::modifyDisplayQuery(
                        $tables,
                        $fields,
                        $conds,
                        $join_conds,
                        $query_options,
                        $opts['tagfilter']
                );

                if ( !$this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds,
                        $opts )
                ) {
                        return false;
                }

                // array_merge() is used intentionally here so that hooks can, should
                // they so desire, override the ORDER BY / LIMIT condition(s); prior to
                // MediaWiki 1.26 this used to use the plus operator instead, which meant
                // that extensions weren't able to change these conditions
                $query_options = array_merge( array(
                        'ORDER BY' => 'rc_timestamp DESC',
                        'LIMIT' => $opts['limit'] ), $query_options );
                $rows = $dbr->select(
                        $tables,
                        $fields,
                        // rc_new is not an ENUM, but adding a redundant rc_new IN (0,1) gives mysql enough
                        // knowledge to use an index merge if it wants (it may use some other index though).
                        $conds + array( 'rc_new' => array( 0, 1 ) ),
                        __METHOD__,
                        $query_options,
                        $join_conds
                );

                // Build the final data
                if ( $this->getConfig()->get( 'AllowCategorizedRecentChanges' ) ) {
                        $this->filterByCategories( $rows, $opts );
                }

                return $rows;
        }

        protected function runMainQueryHook( &$tables, &$fields, &$conds,
                &$query_options, &$join_conds, $opts
        ) {
                return parent::runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts )
                        && Hooks::run(
                                'SpecialRecentChangesQuery',
                                array( &$conds, &$tables, &$join_conds, $opts, &$query_options, &$fields ),
                                '1.23'
                        );
        }

        protected function getDB() {
                return wfGetDB( DB_SLAVE, 'recentchanges' );
        }

        public function outputFeedLinks() {
                $this->addFeedLinks( $this->getFeedQuery() );
        }

        /**
         * Get URL query parameters for action=feedrecentchanges API feed of current recent changes view.
         *
         * @return array
         */
        protected function getFeedQuery() {
                $query = array_filter( $this->getOptions()->getAllValues(), function ( $value ) {
                        // API handles empty parameters in a different way
                        return $value !== '';
                } );
                $query['action'] = 'feedrecentchanges';
                $feedLimit = $this->getConfig()->get( 'FeedLimit' );
                if ( $query['limit'] > $feedLimit ) {
                        $query['limit'] = $feedLimit;
                }

                return $query;
        }

        /**
         * Build and output the actual changes list.
         *
         * @param array $rows Database rows
         * @param FormOptions $opts
         */
        public function outputChangesList( $rows, $opts ) {
                $limit = $opts['limit'];

                $showWatcherCount = $this->getConfig()->get( 'RCShowWatchingUsers' )
                        && $this->getUser()->getOption( 'shownumberswatching' );
                $watcherCache = array();

                $dbr = $this->getDB();

                $counter = 1;
                $list = ChangesList::newFromContext( $this->getContext() );
                $list->initChangesListRows( $rows );

                $rclistOutput = $list->beginRecentChangesList();
                foreach ( $rows as $obj ) {
                        if ( $limit == 0 ) {
                                break;
                        }
                        $rc = RecentChange::newFromRow( $obj );
                        $rc->counter = $counter++;
                        # Check if the page has been updated since the last visit
                        if ( $this->getConfig()->get( 'ShowUpdatedMarker' )
                                && !empty( $obj->wl_notificationtimestamp )
                        ) {
                                $rc->notificationtimestamp = ( $obj->rc_timestamp >= $obj->wl_notificationtimestamp );
                        } else {
                                $rc->notificationtimestamp = false; // Default
                        }
                        # Check the number of users watching the page
                        $rc->numberofWatchingusers = 0; // Default
                        if ( $showWatcherCount && $obj->rc_namespace >= 0 ) {
                                if ( !isset( $watcherCache[$obj->rc_namespace][$obj->rc_title] ) ) {
                                        $watcherCache[$obj->rc_namespace][$obj->rc_title] =
                                                $dbr->selectField(
                                                        'watchlist',
                                                        'COUNT(*)',
                                                        array(
                                                                'wl_namespace' => $obj->rc_namespace,
                                                                'wl_title' => $obj->rc_title,
                                                        ),
                                                        __METHOD__ . '-watchers'
                                                );
                                }
                                $rc->numberofWatchingusers = $watcherCache[$obj->rc_namespace][$obj->rc_title];
                        }

                        $changeLine = $list->recentChangesLine( $rc, !empty( $obj->wl_user ), $counter );
                        if ( $changeLine !== false ) {
                                $rclistOutput .= $changeLine;
                                --$limit;
                        }
                }
                $rclistOutput .= $list->endRecentChangesList();

                if ( $rows->numRows() === 0 ) {
                        $this->getOutput()->addHtml(
                                '<div class="mw-changeslist-empty">' .
                                $this->msg( 'recentchanges-noresult' )->parse() .
                                '</div>'
                        );
                        if ( !$this->including() ) {
                                $this->getOutput()->setStatusCode( 404 );
                        }
                } else {
                        $this->getOutput()->addHTML( $rclistOutput );
                }
        }

        /**
         * Set the text to be displayed above the changes
         *
         * @param FormOptions $opts
         * @param int $numRows Number of rows in the result to show after this header
         */
        public function doHeader( $opts, $numRows ) {
                $this->setTopText( $opts );

                $defaults = $opts->getAllValues();
                $nondefaults = $opts->getChangedValues();

                $panel = array();
                $panel[] = self::makeLegend( $this->getContext() );
                $panel[] = $this->optionsPanel( $defaults, $nondefaults, $numRows );
                $panel[] = '<hr />';

                $extraOpts = $this->getExtraOptions( $opts );
                $extraOptsCount = count( $extraOpts );
                $count = 0;
                $submit = ' ' . Xml::submitbutton( $this->msg( 'recentchanges-submit' )->text() );

                $out = Xml::openElement( 'table', array( 'class' => 'mw-recentchanges-table' ) );
                foreach ( $extraOpts as $name => $optionRow ) {
                        # Add submit button to the last row only
                        ++$count;
                        $addSubmit = ( $count === $extraOptsCount ) ? $submit : '';

                        $out .= Xml::openElement( 'tr' );
                        if ( is_array( $optionRow ) ) {
                                $out .= Xml::tags(
                                        'td',
                                        array( 'class' => 'mw-label mw-' . $name . '-label' ),
                                        $optionRow[0]
                                );
                                $out .= Xml::tags(
                                        'td',
                                        array( 'class' => 'mw-input' ),
                                        $optionRow[1] . $addSubmit
                                );
                        } else {
                                $out .= Xml::tags(
                                        'td',
                                        array( 'class' => 'mw-input', 'colspan' => 2 ),
                                        $optionRow . $addSubmit
                                );
                        }
                        $out .= Xml::closeElement( 'tr' );
                }
                $out .= Xml::closeElement( 'table' );

                $unconsumed = $opts->getUnconsumedValues();
                foreach ( $unconsumed as $key => $value ) {
                        $out .= Html::hidden( $key, $value );
                }

                $t = $this->getPageTitle();
                $out .= Html::hidden( 'title', $t->getPrefixedText() );
                $form = Xml::tags( 'form', array( 'action' => wfScript() ), $out );
                $panel[] = $form;
                $panelString = implode( "\n", $panel );

                $this->getOutput()->addHTML(
                        Xml::fieldset(
                                $this->msg( 'recentchanges-legend' )->text(),
                                $panelString,
                                array( 'class' => 'rcoptions' )
                        )
                );

                $this->setBottomText( $opts );
        }

        /**
         * Send the text to be displayed above the options
         *
         * @param FormOptions $opts Unused
         */
        function setTopText( FormOptions $opts ) {
                global $wgContLang;

                $message = $this->msg( 'recentchangestext' )->inContentLanguage();
                if ( !$message->isDisabled() ) {
                        $this->getOutput()->addWikiText(
                                Html::rawElement( 'div',
                                        array( 'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ),
                                        "\n" . $message->plain() . "\n"
                                ),
                                /* $lineStart */ true,
                                /* $interface */ false
                        );
                }
        }

        /**
         * Get options to be displayed in a form
         *
         * @param FormOptions $opts
         * @return array
         */
        function getExtraOptions( $opts ) {
                $opts->consumeValues( array(
                        'namespace', 'invert', 'associated', 'tagfilter', 'categories', 'categories_any'
                ) );

                $extraOpts = array();
                $extraOpts['namespace'] = $this->namespaceFilterForm( $opts );

                if ( $this->getConfig()->get( 'AllowCategorizedRecentChanges' ) ) {
                        $extraOpts['category'] = $this->categoryFilterForm( $opts );
                }

                $tagFilter = ChangeTags::buildTagFilterSelector( $opts['tagfilter'] );
                if ( count( $tagFilter ) ) {
                        $extraOpts['tagfilter'] = $tagFilter;
                }

                // Don't fire the hook for subclasses. (Or should we?)
                if ( $this->getName() === 'Recentchanges' ) {
                        Hooks::run( 'SpecialRecentChangesPanel', array( &$extraOpts, $opts ) );
                }

                return $extraOpts;
        }

        /**
         * Add page-specific modules.
         */
        protected function addModules() {
                parent::addModules();
                $out = $this->getOutput();
                $out->addModules( 'mediawiki.special.recentchanges' );
        }

        /**
         * Get last modified date, for client caching
         * Don't use this if we are using the patrol feature, patrol changes don't
         * update the timestamp
         *
         * @return string|bool
         */
        public function checkLastModified() {
                $dbr = $this->getDB();
                $lastmod = $dbr->selectField( 'recentchanges', 'MAX(rc_timestamp)', false, __METHOD__ );

                return $lastmod;
        }

        /**
         * Creates the choose namespace selection
         *
         * @param FormOptions $opts
         * @return string
         */
        protected function namespaceFilterForm( FormOptions $opts ) {
                $nsSelect = Html::namespaceSelector(
                        array( 'selected' => $opts['namespace'], 'all' => '' ),
                        array( 'name' => 'namespace', 'id' => 'namespace' )
                );
                $nsLabel = Xml::label( $this->msg( 'namespace' )->text(), 'namespace' );
                $invert = Xml::checkLabel(
                        $this->msg( 'invert' )->text(), 'invert', 'nsinvert',
                        $opts['invert'],
                        array( 'title' => $this->msg( 'tooltip-invert' )->text() )
                );
                $associated = Xml::checkLabel(
                        $this->msg( 'namespace_association' )->text(), 'associated', 'nsassociated',
                        $opts['associated'],
                        array( 'title' => $this->msg( 'tooltip-namespace_association' )->text() )
                );

                return array( $nsLabel, "$nsSelect $invert $associated" );
        }

        /**
         * Create an input to filter changes by categories
         *
         * @param FormOptions $opts
         * @return array
         */
        protected function categoryFilterForm( FormOptions $opts ) {
                list( $label, $input ) = Xml::inputLabelSep( $this->msg( 'rc_categories' )->text(),
                        'categories', 'mw-categories', false, $opts['categories'] );

                $input .= ' ' . Xml::checkLabel( $this->msg( 'rc_categories_any' )->text(),
                        'categories_any', 'mw-categories_any', $opts['categories_any'] );

                return array( $label, $input );
        }

        /**
         * Filter $rows by categories set in $opts
         *
         * @param ResultWrapper $rows Database rows
         * @param FormOptions $opts
         */
        function filterByCategories( &$rows, FormOptions $opts ) {
                $categories = array_map( 'trim', explode( '|', $opts['categories'] ) );

                if ( !count( $categories ) ) {
                        return;
                }

                # Filter categories
                $cats = array();
                foreach ( $categories as $cat ) {
                        $cat = trim( $cat );
                        if ( $cat == '' ) {
                                continue;
                        }
                        $cats[] = $cat;
                }

                # Filter articles
                $articles = array();
                $a2r = array();
                $rowsarr = array();
                foreach ( $rows as $k => $r ) {
                        $nt = Title::makeTitle( $r->rc_namespace, $r->rc_title );
                        $id = $nt->getArticleID();
                        if ( $id == 0 ) {
                                continue; # Page might have been deleted...
                        }
                        if ( !in_array( $id, $articles ) ) {
                                $articles[] = $id;
                        }
                        if ( !isset( $a2r[$id] ) ) {
                                $a2r[$id] = array();
                        }
                        $a2r[$id][] = $k;
                        $rowsarr[$k] = $r;
                }

                # Shortcut?
                if ( !count( $articles ) || !count( $cats ) ) {
                        return;
                }

                # Look up
                $catFind = new CategoryFinder;
                $catFind->seed( $articles, $cats, $opts['categories_any'] ? 'OR' : 'AND' );
                $match = $catFind->run();

                # Filter
                $newrows = array();
                foreach ( $match as $id ) {
                        foreach ( $a2r[$id] as $rev ) {
                                $k = $rev;
                                $newrows[$k] = $rowsarr[$k];
                        }
                }
                $rows = $newrows;
        }

        /**
         * Makes change an option link which carries all the other options
         *
         * @param string $title Title
         * @param array $override Options to override
         * @param array $options Current options
         * @param bool $active Whether to show the link in bold
         * @return string
         */
        function makeOptionsLink( $title, $override, $options, $active = false ) {
                $params = $override + $options;

                // Bug 36524: false values have be converted to "0" otherwise
                // wfArrayToCgi() will omit it them.
                foreach ( $params as &$value ) {
                        if ( $value === false ) {
                                $value = '0';
                        }
                }
                unset( $value );

                $text = htmlspecialchars( $title );
                if ( $active ) {
                        $text = '<strong>' . $text . '</strong>';
                }

                return Linker::linkKnown( $this->getPageTitle(), $text, array(), $params );
        }

        /**
         * Creates the options panel.
         *
         * @param array $defaults
         * @param array $nondefaults
         * @param int $numRows Number of rows in the result to show after this header
         * @return string
         */
        function optionsPanel( $defaults, $nondefaults, $numRows ) {
                $options = $nondefaults + $defaults;

                $note = '';
                $msg = $this->msg( 'rclegend' );
                if ( !$msg->isDisabled() ) {
                        $note .= '<div class="mw-rclegend">' . $msg->parse() . "</div>\n";
                }

                $lang = $this->getLanguage();
                $user = $this->getUser();
                $config = $this->getConfig();
                if ( $options['from'] ) {
                        $note .= $this->msg( 'rcnotefrom' )
                                ->numParams( $options['limit'] )
                                ->params(
                                        $lang->userTimeAndDate( $options['from'], $user ),
                                        $lang->userDate( $options['from'], $user ),
                                        $lang->userTime( $options['from'], $user )
                                )
                                ->numParams( $numRows )
                                ->parse() . '<br />';
                }

                # Sort data for display and make sure it's unique after we've added user data.
                $linkLimits = $config->get( 'RCLinkLimits' );
                $linkLimits[] = $options['limit'];
                sort( $linkLimits );
                $linkLimits = array_unique( $linkLimits );

                $linkDays = $config->get( 'RCLinkDays' );
                $linkDays[] = $options['days'];
                sort( $linkDays );
                $linkDays = array_unique( $linkDays );

                // limit links
                $cl = array();
                foreach ( $linkLimits as $value ) {
                        $cl[] = $this->makeOptionsLink( $lang->formatNum( $value ),
                                array( 'limit' => $value ), $nondefaults, $value == $options['limit'] );
                }
                $cl = $lang->pipeList( $cl );

                // day links, reset 'from' to none
                $dl = array();
                foreach ( $linkDays as $value ) {
                        $dl[] = $this->makeOptionsLink( $lang->formatNum( $value ),
                                array( 'days' => $value, 'from' => '' ), $nondefaults, $value == $options['days'] );
                }
                $dl = $lang->pipeList( $dl );

                // show/hide links
                $filters = array(
                        'hideminor' => 'rcshowhideminor',
                        'hidebots' => 'rcshowhidebots',
                        'hideanons' => 'rcshowhideanons',
                        'hideliu' => 'rcshowhideliu',
                        'hidepatrolled' => 'rcshowhidepatr',
                        'hidemyself' => 'rcshowhidemine'
                );

                if ( $config->get( 'RCWatchCategoryMembership' ) ) {
                        $filters['hidecategorization'] = 'rcshowhidecategorization';
                }

                $showhide = array( 'show', 'hide' );

                foreach ( $this->getCustomFilters() as $key => $params ) {
                        $filters[$key] = $params['msg'];
                }
                // Disable some if needed
                if ( !$user->useRCPatrol() ) {
                        unset( $filters['hidepatrolled'] );
                }

                $links = array();
                foreach ( $filters as $key => $msg ) {
                        // The following messages are used here:
                        // rcshowhideminor-show, rcshowhideminor-hide, rcshowhidebots-show, rcshowhidebots-hide,
                        // rcshowhideanons-show, rcshowhideanons-hide, rcshowhideliu-show, rcshowhideliu-hide,
                        // rcshowhidepatr-show, rcshowhidepatr-hide, rcshowhidemine-show, rcshowhidemine-hide,
                        // rcshowhidecategorization-show, rcshowhidecategorization-hide.
                        $linkMessage = $this->msg( $msg . '-' . $showhide[1 - $options[$key]] );
                        // Extensions can define additional filters, but don't need to define the corresponding
                        // messages. If they don't exist, just fall back to 'show' and 'hide'.
                        if ( !$linkMessage->exists() ) {
                                $linkMessage = $this->msg( $showhide[1 - $options[$key]] );
                        }

                        $link = $this->makeOptionsLink( $linkMessage->text(),
                                array( $key => 1 - $options[$key] ), $nondefaults );
                        $links[] = "<span class=\"$msg rcshowhideoption\">"
                                . $this->msg( $msg )->rawParams( $link )->escaped() . '</span>';
                }

                // show from this onward link
                $timestamp = wfTimestampNow();
                $now = $lang->userTimeAndDate( $timestamp, $user );
                $timenow = $lang->userTime( $timestamp, $user );
                $datenow = $lang->userDate( $timestamp, $user );
                $pipedLinks = '<span class="rcshowhide">' . $lang->pipeList( $links ) . '</span>';

                $rclinks = '<span class="rclinks">' . $this->msg( 'rclinks' )->rawParams( $cl, $dl, $pipedLinks )
                        ->parse() . '</span>';

                $rclistfrom = '<span class="rclistfrom">' . $this->makeOptionsLink(
                        $this->msg( 'rclistfrom' )->rawParams( $now, $timenow, $datenow )->parse(),
                        array( 'from' => $timestamp ),
                        $nondefaults
                ) . '</span>';

                return "{$note}$rclinks<br />$rclistfrom";
        }

        public function isIncludable() {
                return true;
        }
}