From 4a04bbca9a0b6141371fa0cd6fd9eff32264ff3c Mon Sep 17 00:00:00 2001
From: Jan Luca Naumann <jan@users.mediawiki.org>
Date: Mon, 18 May 2009 14:20:46 +0000
Subject: [PATCH] (bug 18834) Commit Patch from User Joshua C. Lerner
 <jlerner@gmail.com> for include/Linker.php

---
 includes/Linker.php | 51 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/includes/Linker.php b/includes/Linker.php
index f3fdb549b3..e93598e1b5 100644
--- a/includes/Linker.php
+++ b/includes/Linker.php
@@ -1621,7 +1621,56 @@ class Linker {
 		}
 		$query['token'] = $wgUser->editToken( array( $title->getPrefixedText(),
 			$rev->getUserText() ) );
-		return $this->link( $title, wfMsgHtml( 'rollbacklink' ),
+
+		$dbr = wfGetDB( DB_MASTER );
+
+		// Latest edits by this user, up to 10; if too expensive, use only on smaller wikis
+		$res = $dbr->select( 'revision',
+			array( 'rev_id' ),
+			array(  'rev_page' => $rev->getPage(), 
+				'rev_user_text' => $rev->getUserText()
+			), __METHOD__, 
+			array(  'USE INDEX' => 'page_timestamp',
+				'ORDER BY' => 'rev_timestamp DESC',
+				'LIMIT' => 10 ) 
+			);
+
+		// Swiped from Article::commitRollback()
+		$user = intval( $rev->getUser() );
+		$user_text = $dbr->addQuotes( $rev->getUserText() );
+
+		// Get the last edit not by this guy
+		$s = $dbr->selectRow( 'revision',
+			array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
+			array(  'rev_page' => $rev->getPage(),
+				"rev_user != {$user} OR rev_user_text != {$user_text}"
+			), __METHOD__,
+			array(  'USE INDEX' => 'page_timestamp',
+				'ORDER BY'  => 'rev_timestamp DESC' )
+			);
+
+		if( $s === false ) {
+			// No one else ever edited this page
+			return false;
+		} 
+		elseif( $s->rev_deleted & REVISION::DELETED_TEXT || $s->rev_deleted & REVISION::DELETED_USER ) {
+			// Only admins can see this text
+			return false;
+		}
+
+		$editCount = 0;
+		while( $row = $dbr->fetchObject( $res ) ) {
+			$editCount++;
+			if( $s->rev_id > $row->rev_id ) {
+				break;
+			}
+		}
+
+		// We only bother to count up to 10
+		if( $editCount == 10 )
+			$editCount = '10+';
+
+		return $this->link( $title, wfMsgHtml( 'rollbacklink', $editCount ),
 			array( 'title' => wfMsg( 'tooltip-rollback' ) ),
 			$query,	array( 'known', 'noclasses' ) );
 	}
-- 
2.20.1