deleteEqualMessages.php

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<?php
use MediaWiki\MediaWikiServices;

require_once __DIR__ . '/Maintenance.php';

class DeleteEqualMessages extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Deletes all pages in the MediaWiki namespace that are equal to '
            . 'the default message' );
        $this->addOption( 'delete', 'Actually delete the pages (default: dry run)' );
        $this->addOption( 'delete-talk', 'Don\'t leave orphaned talk pages behind during deletion' );
        $this->addOption( 'lang-code', 'Check for subpages of this language code (default: root '
            . 'page against content language). Use value "*" to run for all mwfile language code '
            . 'subpages (including the base pages that override content language).', false, true );
    }

    protected function fetchMessageInfo( $langCode, array &$messageInfo ) {
        $contLang = MediaWikiServices::getInstance()->getContentLanguage();
        if ( $langCode ) {
            $this->output( "\n... fetching message info for language: $langCode" );
            $nonContentLanguage = true;
        } else {
            $this->output( "\n... fetching message info for content language" );
            $langCode = $contLang->getCode();
            $nonContentLanguage = false;
        }

        /* Based on SpecialAllmessages::reallyDoQuery #filter=modified */

        $l10nCache = Language::getLocalisationCache();
        $messageNames = $l10nCache->getSubitemList( 'en', 'messages' );
        // Normalise message names for NS_MEDIAWIKI page_title
        $messageNames = array_map( [ $contLang, 'ucfirst' ], $messageNames );

        $statuses = AllMessagesTablePager::getCustomisedStatuses(
            $messageNames, $langCode, $nonContentLanguage );
        // getCustomisedStatuses is stripping the sub page from the page titles, add it back
        $titleSuffix = $nonContentLanguage ? "/$langCode" : '';

        foreach ( $messageNames as $key ) {
            $customised = isset( $statuses['pages'][$key] );
            if ( $customised ) {
                $actual = wfMessage( $key )->inLanguage( $langCode )->plain();
                $default = wfMessage( $key )->inLanguage( $langCode )->useDatabase( false )->plain();

                $messageInfo['relevantPages']++;

                if (
                    // Exclude messages that are empty by default, such as sitenotice, specialpage
                    // summaries and accesskeys.
                    $default !== '' && $default !== '-' &&
                        $actual === $default
                ) {
                    $hasTalk = isset( $statuses['talks'][$key] );
                    $messageInfo['results'][] = [
                        'title' => $key . $titleSuffix,
                        'hasTalk' => $hasTalk,
                    ];
                    $messageInfo['equalPages']++;
                    if ( $hasTalk ) {
                        $messageInfo['equalPagesTalks']++;
                    }
                }
            }
        }
    }

    public function execute() {
        $doDelete = $this->hasOption( 'delete' );
        $doDeleteTalk = $this->hasOption( 'delete-talk' );
        $langCode = $this->getOption( 'lang-code' );

        $messageInfo = [
            'relevantPages' => 0,
            'equalPages' => 0,
            'equalPagesTalks' => 0,
            'results' => [],
        ];

        $this->output( 'Checking for pages with default message...' );

        // Load message information
        if ( $langCode ) {
            $langCodes = Language::fetchLanguageNames( null, 'mwfile' );
            if ( $langCode === '*' ) {
                // All valid lang-code subpages in NS_MEDIAWIKI that
                // override the messsages in that language
                foreach ( $langCodes as $key => $value ) {
                    $this->fetchMessageInfo( $key, $messageInfo );
                }
                // Lastly, the base pages in NS_MEDIAWIKI that override
                // messages in content language
                $this->fetchMessageInfo( false, $messageInfo );
            } else {
                if ( !isset( $langCodes[$langCode] ) ) {
                    $this->fatalError( 'Invalid language code: ' . $langCode );
                }
                $this->fetchMessageInfo( $langCode, $messageInfo );
            }
        } else {
            $this->fetchMessageInfo( false, $messageInfo );
        }

        if ( $messageInfo['equalPages'] === 0 ) {
            // No more equal messages left
            $this->output( "\ndone.\n" );

            return;
        }

        $this->output( "\n{$messageInfo['relevantPages']} pages in the MediaWiki namespace "
            . "override messages." );
        $this->output( "\n{$messageInfo['equalPages']} pages are equal to the default message "
            . "(+ {$messageInfo['equalPagesTalks']} talk pages).\n" );

        if ( !$doDelete ) {
            $list = '';
            foreach ( $messageInfo['results'] as $result ) {
                $title = Title::makeTitle( NS_MEDIAWIKI, $result['title'] );
                $list .= "* [[$title]]\n";
                if ( $result['hasTalk'] ) {
                    $title = Title::makeTitle( NS_MEDIAWIKI_TALK, $result['title'] );
                    $list .= "* [[$title]]\n";
                }
            }
            $this->output( "\nList:\n$list\nRun the script again with --delete to delete these pages" );
            if ( $messageInfo['equalPagesTalks'] !== 0 ) {
                $this->output( " (include --delete-talk to also delete the talk pages)" );
            }
            $this->output( "\n" );

            return;
        }

        $user = User::newSystemUser( 'MediaWiki default', [ 'steal' => true ] );
        if ( !$user ) {
            $this->fatalError( "Invalid username" );
        }
        global $wgUser;
        $wgUser = $user;

        // Hide deletions from RecentChanges
        $user->addGroup( 'bot' );

        // Handle deletion
        $this->output( "\n...deleting equal messages (this may take a long time!)..." );
        $dbw = $this->getDB( DB_MASTER );
        foreach ( $messageInfo['results'] as $result ) {
            wfWaitForSlaves();
            $dbw->ping();
            $title = Title::makeTitle( NS_MEDIAWIKI, $result['title'] );
            $this->output( "\n* [[$title]]" );
            $page = WikiPage::factory( $title );
            $error = ''; // Passed by ref
            $success = $page->doDeleteArticle( 'No longer required', false, 0, true, $error, $user );
            if ( !$success ) {
                $this->output( " (Failed!)" );
            }
            if ( $result['hasTalk'] && $doDeleteTalk ) {
                $title = Title::makeTitle( NS_MEDIAWIKI_TALK, $result['title'] );
                $this->output( "\n* [[$title]]" );
                $page = WikiPage::factory( $title );
                $error = ''; // Passed by ref
                $success = $page->doDeleteArticle( 'Orphaned talk page of no longer required message',
                    false, 0, true, $error, $user );
                if ( !$success ) {
                    $this->output( " (Failed!)" );
                }
            }
        }
        $this->output( "\n\ndone!\n" );
    }
}

$maintClass = DeleteEqualMessages::class;
require_once RUN_MAINTENANCE_IF_MAIN;