namespaceDupes.php

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

class NamespaceConflictChecker extends Maintenance {

        protected $db;

        public function __construct() {
                parent::__construct();
                $this->mDescription = "";
                $this->addOption( 'fix', 'Attempt to automatically fix errors' );
                $this->addOption( 'suffix', "Dupes will be renamed with correct namespace with " .
                                                                        "<text> appended after the article name", false, true );
                $this->addOption( 'prefix', "Do an explicit check for the given title prefix " .
                                                                        "appended after the article name", false, true );
        }

        public function execute() {
                global $wgTitle;

                $this->db = wfGetDB( DB_MASTER );
                $wgTitle = Title::newFromText( 'Namespace title conflict cleanup script' );

                $fix = $this->hasOption( 'fix' );
                $suffix = $this->getOption( 'suffix', '' );
                $prefix = $this->getOption( 'prefix', '' );
                $key = intval( $this->getOption( 'key', 0 ) );

                if ( $prefix ) {
                        $retval = $this->checkPrefix( $key, $prefix, $fix, $suffix );
                } else {
                        $retval = $this->checkAll( $fix, $suffix );
                }

                if ( $retval ) {
                        $this->output( "\nLooks good!\n" );
                } else {
                        $this->output( "\nOh noeees\n" );
                }
        }

        private function checkAll( $fix, $suffix = '' ) {
                global $wgContLang, $wgNamespaceAliases, $wgCapitalLinks;

                $spaces = array();

                // List interwikis first, so they'll be overridden
                // by any conflicting local namespaces.
                foreach ( $this->getInterwikiList() as $prefix ) {
                        $name = $wgContLang->ucfirst( $prefix );
                        $spaces[$name] = 0;
                }

                // Now pull in all canonical and alias namespaces...
                foreach ( MWNamespace::getCanonicalNamespaces() as $ns => $name ) {
                        // This includes $wgExtraNamespaces
                        if ( $name !== '' ) {
                                $spaces[$name] = $ns;
                        }
                }
                foreach ( $wgContLang->getNamespaces() as $ns => $name ) {
                        if ( $name !== '' ) {
                                $spaces[$name] = $ns;
                        }
                }
                foreach ( $wgNamespaceAliases as $name => $ns ) {
                        $spaces[$name] = $ns;
                }
                foreach ( $wgContLang->getNamespaceAliases() as $name => $ns ) {
                        $spaces[$name] = $ns;
                }

                // We'll need to check for lowercase keys as well,
                // since we're doing case-sensitive searches in the db.
                foreach ( $spaces as $name => $ns ) {
                        $moreNames = array();
                        $moreNames[] = $wgContLang->uc( $name );
                        $moreNames[] = $wgContLang->ucfirst( $wgContLang->lc( $name ) );
                        $moreNames[] = $wgContLang->ucwords( $name );
                        $moreNames[] = $wgContLang->ucwords( $wgContLang->lc( $name ) );
                        $moreNames[] = $wgContLang->ucwordbreaks( $name );
                        $moreNames[] = $wgContLang->ucwordbreaks( $wgContLang->lc( $name ) );
                        if ( !$wgCapitalLinks ) {
                                foreach ( $moreNames as $altName ) {
                                        $moreNames[] = $wgContLang->lcfirst( $altName );
                                }
                                $moreNames[] = $wgContLang->lcfirst( $name );
                        }
                        foreach ( array_unique( $moreNames ) as $altName ) {
                                if ( $altName !== $name ) {
                                        $spaces[$altName] = $ns;
                                }
                        }
                }

                ksort( $spaces );
                asort( $spaces );

                $ok = true;
                foreach ( $spaces as $name => $ns ) {
                        $ok = $this->checkNamespace( $ns, $name, $fix, $suffix ) && $ok;
                }
                return $ok;
        }

        private function getInterwikiList() {
                $result = $this->db->select( 'interwiki', array( 'iw_prefix' ) );
                $prefixes = array();
                foreach ( $result as $row ) {
                        $prefixes[] = $row->iw_prefix;
                }
                return $prefixes;
        }

        private function checkNamespace( $ns, $name, $fix, $suffix = '' ) {
                $conflicts = $this->getConflicts( $ns, $name );
                $count = count( $conflicts );
                if ( $count == 0 ) {
                        return true;
                }

                $ok = true;
                foreach ( $conflicts as $row ) {
                        $resolvable = $this->reportConflict( $row, $suffix );
                        $ok = $ok && $resolvable;
                        if ( $fix && ( $resolvable || $suffix != '' ) ) {
                                $ok = $this->resolveConflict( $row, $resolvable, $suffix ) && $ok;
                        }
                }
                return $ok;
        }

        private function checkPrefix( $key, $prefix, $fix, $suffix = '' ) {
                $this->output( "Checking prefix \"$prefix\" vs namespace $key\n" );
                return $this->checkNamespace( $key, $prefix, $fix, $suffix );
        }

        private function getConflicts( $ns, $name ) {
                $page  = 'page';
                $table = $this->db->tableName( $page );

                $prefix     = $this->db->strencode( $name );
                $encNamespace = $this->db->addQuotes( $ns );

                $titleSql = "TRIM(LEADING '$prefix:' FROM {$page}_title)";
                if ( $ns == 0 ) {
                        // An interwiki; try an alternate encoding with '-' for ':'
                        $titleSql = $this->db->buildConcat( array( "'$prefix-'", $titleSql ) );
                }

                $sql = "SELECT {$page}_id    AS id,
                                           {$page}_title AS oldtitle,
                                           $encNamespace + {$page}_namespace AS namespace,
                                   $titleSql     AS title,
                                   {$page}_namespace AS oldnamespace
                                  FROM {$table}
                                 WHERE ( {$page}_namespace=0 OR {$page}_namespace=1 )
                                   AND {$page}_title " . $this->db->buildLike( $name . ':', $this->db->anyString() );

                $result = $this->db->query( $sql, __METHOD__ );

                $set = array();
                foreach ( $result as $row ) {
                        $set[] = $row;
                }
                return $set;
        }

        private function reportConflict( $row, $suffix ) {
                $newTitle = Title::makeTitleSafe( $row->namespace, $row->title );
                if ( is_null( $newTitle ) || !$newTitle->canExist() ) {
                        // Title is also an illegal title...
                        // For the moment we'll let these slide to cleanupTitles or whoever.
                        $this->output( sprintf( "... %d (%d,\"%s\")\n",
                                $row->id,
                                $row->oldnamespace,
                                $row->oldtitle ) );
                        $this->output( "...  *** cannot resolve automatically; illegal title ***\n" );
                        return false;
                }

                $this->output( sprintf( "... %d (%d,\"%s\") -> (%d,\"%s\") [[%s]]\n",
                        $row->id,
                        $row->oldnamespace,
                        $row->oldtitle,
                        $newTitle->getNamespace(),
                        $newTitle->getDBkey(),
                        $newTitle->getPrefixedText() ) );

                $id = $newTitle->getArticleID();
                if ( $id ) {
                        $this->output( "...  *** cannot resolve automatically; page exists with ID $id ***\n" );
                        return false;
                } else {
                        return true;
                }
        }

        private function resolveConflict( $row, $resolvable, $suffix ) {
                if ( !$resolvable ) {
                        $this->output( "...  *** old title {$row->title}\n" );
                        while ( true ) {
                                $row->title .= $suffix;
                                $this->output( "...  *** new title {$row->title}\n" );
                                $title = Title::makeTitleSafe( $row->namespace, $row->title );
                                if ( !$title ) {
                                        $this->output( "... !!! invalid title\n" );
                                        return false;
                                }
                                $id = $title->getArticleID();
                                if ( $id ) {
                                        $this->output( "...  *** page exists with ID $id ***\n" );
                                } else {
                                        break;
                                }
                        }
                        $this->output( "...  *** using suffixed form [[" . $title->getPrefixedText() . "]] ***\n" );
                }
                $this->resolveConflictOn( $row, 'page', 'page' );
                return true;
        }

        private function resolveConflictOn( $row, $table, $prefix ) {
                $this->output( "... resolving on $table... " );
                $newTitle = Title::makeTitleSafe( $row->namespace, $row->title );
                $this->db->update( $table,
                        array(
                                "{$prefix}_namespace" => $newTitle->getNamespace(),
                                "{$prefix}_title"     => $newTitle->getDBkey(),
                        ),
                        array(
                                // "{$prefix}_namespace" => 0,
                                // "{$prefix}_title"     => $row->oldtitle,
                                "{$prefix}_id"           => $row->id,
                        ),
                        __METHOD__ );
                $this->output( "ok.\n" );
                return true;
        }
}

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