From a5028bfe5f638e53ab002114435e8e480ef4bbc9 Mon Sep 17 00:00:00 2001
From: Timo Tijhof <ttijhof@wikimedia.org>
Date: Sun, 13 Jan 2013 02:06:15 +0100
Subject: [PATCH] (bug 43915) Implement deleteEqualMessages.php

Change-Id: I97529b775d4db4f996c40395c891a0049d2e43c5
---
 RELEASE-NOTES-1.21                  |   3 +-
 maintenance/deleteEqualMessages.php | 143 ++++++++++++++++++++++++++++
 2 files changed, 145 insertions(+), 1 deletion(-)
 create mode 100644 maintenance/deleteEqualMessages.php

diff --git a/RELEASE-NOTES-1.21 b/RELEASE-NOTES-1.21
index a831310aba..9852162c93 100644
--- a/RELEASE-NOTES-1.21
+++ b/RELEASE-NOTES-1.21
@@ -85,9 +85,10 @@ production.
   a security fix (bug 42202).
 * Added the ability to limit the wall clock time used by shell processes,
   as well as the CPU time. Configurable with $wgMaxShellWallClockTime.
-* Added $wgWhitelistReadRegexp for regex whitelisting
+* Added $wgWhitelistReadRegexp for regex whitelisting.
 * (bug 5346) Categories that are redirects will be displayed italic in
   the category links section at the bottom of a page.
+* (bug 43915) New maintenance script deleteEqualMessages.php.
 
 === Bug fixes in 1.21 ===
 * (bug 40353) SpecialDoubleRedirect should support interwiki redirects.
diff --git a/maintenance/deleteEqualMessages.php b/maintenance/deleteEqualMessages.php
new file mode 100644
index 0000000000..38e6956e9b
--- /dev/null
+++ b/maintenance/deleteEqualMessages.php
@@ -0,0 +1,143 @@
+<?php
+/**
+ * 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 Maintenance
+ */
+
+require_once( __DIR__ . '/Maintenance.php' );
+
+/**
+ * Maintenance script that deletes all pages in the MediaWiki namespace
+ * of which the content is equal to the system default.
+ *
+ * @ingroup Maintenance
+ */
+class DeleteEqualMessages extends Maintenance {
+	public function __construct() {
+		parent::__construct();
+		$this->mDescription = "Deletes all pages in the MediaWiki namespace that are equal to the default message";
+		$this->addOption( 'delete', 'Actually delete the pages' );
+		$this->addOption( 'delete-talk', 'Don\'t leave orphaned talk pages behind' );
+		$this->addOption( 'lang-code', 'Check for subpages of this lang-code (default: root page against content language)', false, true );
+	}
+
+	public function execute() {
+		global $wgUser, $wgContLang;
+
+		$doDelete = $this->hasOption( 'delete' );
+		$doDeleteTalk = $this->hasOption( 'delete-talk' );
+		$forLangCode = $this->getOption( 'lang-code' );
+
+		if ( $forLangCode ) {
+			$langObj = Language::factory( $forLangCode );
+			$langCode = $langObj->getCode();
+			$nonContLang = true;
+		} else {
+			$langObj = $wgContLang;
+			$langCode = $wgContLang->getCode();
+			$nonContLang = false;
+		}
+
+		$this->output( "Checking for pages with default message..." );
+
+		/* Based on SpecialAllmessages::reallyDoQuery #filter=modified */
+
+		$messageNames = Language::getLocalisationCache()->getSubitemList( 'en', 'messages' );
+		// Normalise message names for NS_MEDIAWIKI page_title
+		$messageNames = array_map( array( $langObj, 'ucfirst' ), $messageNames );
+		// TODO: Do the below for each language code (e.g. delete /xxx subpage if equal to MessagesXxx)
+		// Right now it only takes care of the root override, which is enough since most wikis aren't multi-lang wikis.
+		$statuses = AllmessagesTablePager::getCustomisedStatuses( $messageNames, $langCode, $nonContLang );
+
+		$relevantPages = 0;
+		$equalPages = 0;
+		$equalPagesTalks = 0;
+		$results = array();
+		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();
+
+				$relevantPages++;
+				if ( $actual === $default ) {
+					$hasTalk = isset( $statuses['talks'][$key] );
+					$results[] = array(
+						'title' => $key,
+						'hasTalk' => $hasTalk,
+					);
+					$equalPages++;
+					if ( $hasTalk ) {
+						$equalPagesTalks++;
+					}
+				}
+			}
+		}
+
+		if ( $equalPages === 0 ) {
+			// No more equal messages left
+			$this->output( "done.\n" );
+			return;
+		}
+
+		$this->output( "\n{$relevantPages} pages in the MediaWiki namespace override messages." );
+		$this->output( "\n{$equalPages} pages are equal to the default message ({$equalPagesTalks} talk pages).\n" );
+
+		if ( !$doDelete ) {
+			$this->output( "\nRun the script again with --delete to delete these pages" );
+			if ( $equalPagesTalks !== 0 ) {
+				$this->output( " (include --delete-talk to also delete the talk pages)" );
+			}
+			$this->output( "\n" );
+			return;
+		}
+
+		$user = User::newFromName( 'MediaWiki default' );
+		if ( !$user ) {
+			$this->error( "Invalid username", true );
+		}
+		$wgUser = $user;
+
+		// Hide deletions from RecentChanges
+		$user->addGroup( 'bot' );
+
+		// Handle deletion
+		$this->output( "\n...deleting equal messages (this may take a long time!)...", 'msg' );
+		$dbw = wfGetDB( DB_MASTER );
+		foreach ( $results as $result ) {
+			wfWaitForSlaves();
+			$dbw->ping();
+			$dbw->begin( __METHOD__ );
+			$title = Title::makeTitle( NS_MEDIAWIKI, $result['title'] );
+			$page = WikiPage::factory( $title );
+			$error = ''; // Passed by ref
+			$page->doDeleteArticle( 'No longer required', false, 0, false, $error, $user );
+			if ( $result['hasTalk'] && $doDeleteTalk ) {
+				$title = Title::makeTitle( NS_MEDIAWIKI_TALK, $result['title'] );
+				$page = WikiPage::factory( $title );
+				$error = ''; // Passed by ref
+				$page->doDeleteArticle( 'Orphaned talk page of no longer required message', false, 0, false, $error, $user );
+			}
+			$dbw->commit( __METHOD__ );
+		}
+		$this->output( "done!\n", 'msg' );
+	}
+}
+
+$maintClass = "DeleteEqualMessages";
+require_once( RUN_MAINTENANCE_IF_MAIN );
-- 
2.20.1