maintenance: Add --dry-run option to deleteDefaultMessages.php

For back-compat, keep the default as-is, because it is also used as a post-update script by the installer. But for convenience and safe manual use, do add a dry-run option. (Ideally this would be a --delete option and dry-run by default.) Change-Id: I3ca70f15f50b66f9d19fa705cef9a4aae2dd4e5c

Author: Krinkle

maintenance/deleteDefaultMessages.php

@@ -35,6 +35,7 @@ public function __construct() {
 parent::__construct();
 $this->addDescription( 'Deletes all pages in the MediaWiki namespace' .
 ' which were last edited by "MediaWiki default"' );
+$this->addOption( 'dry-run', 'Perform a dry run, delete nothing' );
 }
 
 public function execute() {
@@ -52,22 +53,31 @@ public function execute() {
 );
 
 if ( $dbr->numRows( $res ) == 0 ) {
-# No more messages left
+// No more messages left
 $this->output( "done.\n" );
+return;
+}
 
+$dryrun = $this->hasOption( 'dry-run' );
+if ( $dryrun ) {
+foreach ( $res as $row ) {
+$title = Title::makeTitle( $row->page_namespace, $row->page_title );
+$this->output( "\n* [[$title]]" );
+}
+$this->output( "\n\nRun again without --dry-run to delete these pages.\n" );
 return;
 }
 
-# Deletions will be made by $user temporarly added to the bot group
-# in order to hide it in RecentChanges.
+// Deletions will be made by $user temporarly added to the bot group
+// in order to hide it in RecentChanges.
 $user = User::newFromName( 'MediaWiki default' );
 if ( !$user ) {
 $this->error( "Invalid username", true );
 }
 $user->addGroup( 'bot' );
 $wgUser = $user;
 
-# Handle deletion
+// Handle deletion
 $this->output( "\n...deleting old default messages (this may take a long time!)...", 'msg' );
 $dbw = $this->getDB( DB_MASTER );