Index: HideRevision.i18n.php
===================================================================
--- HideRevision.i18n.php	(revision 19540)
+++ HideRevision.i18n.php	(working copy)
@@ -37,11 +37,19 @@
 'hiderevision-error-current' => 'Cannot delete the latest edit to a page. Revert this change first.',
 'hiderevision-error-delete' => 'Could not archive; was it previously deleted?',
 'hiderevision-archive-status' => 'Deleted revision from $1: $2',
+'oversight-nodiff' => 'Unable to track changes as there is currently no previous revision for the page. Either:	
+*The page was deleted
+*This hidden revision was the first revision',
 // Logging
 'oversight-log-hiderev' => 'removed an edit from $1',
 // Oversight review page
 'oversight' => 'Oversight',
 'oversight-view' => 'details',
+'oversight-difference' => '(Difference from previous remaining revision)',
+'oversight-prev' => 'Last previous revision',
+'oversight-hidden' => 'Hidden revision',
+'oversight-header' => 'Below is a list of revisions permanantly hidden from public view.
+Releasing this information can result in permanent loss of Oversight priviledges.',
 ),
 
 /* German (Raymond) */
@@ -108,11 +116,18 @@
 'hiderevision-error-current' => 'Ne peut supprimer la dernière révision dans une page. Faites une annulation d’édition auparavant.',
 'hiderevision-error-delete' => 'Ne peut être archivé ; la page a peut-être été supprimée ?',
 'hiderevision-archive-status' => 'Modification supprimée de $1 : $2',
+'oversight-nodiff' => 'Incapable de dépister des changements en tant que là n\'est actuellement aucune révision précédente pour la page. L\'un ou l\'autre:
+*La page a été supprimée
+*Cette révision cachée était la première révision de la page',
 // Logging
 'oversight-log-hiderev' => 'a supprimé une édition de $1',
 // Oversight review page
 'oversight' => 'Oversight',
 'oversight-view' => 'détails',
+'oversight-difference' => '(Différence de révision restante précédente)',
+'oversight-prev' => 'Dernière révision précédente',
+'oversight-hidden' => 'Révision cachée',
+'oversight-header' => 'Au-dessous de est une liste de révisions cachées de manière permanente de la vue publique. Libérer cette information peut avoir comme conséquence la perte permanente de priviledges d\'Oversight.',
 ),
 
 /* Portuguese (Lugusto) */
Index: HideRevision.php
===================================================================
--- HideRevision.php	(revision 18857)
+++ HideRevision.php	(working copy)
@@ -56,10 +56,8 @@
 	require_once( dirname( __FILE__ ) . '/HideRevision.i18n.php' );
 	foreach( hrHideRevisionMessages() as $lang => $messages )
 		$GLOBALS['wgMessageCache']->addMessages( $messages, $lang );
-	
 }
 
-
 /**
  * Hook for article view, giving us a chance to insert a removal
  * tab on old version views.
@@ -195,11 +193,11 @@
 				'method' => 'post' ) ) .
 			
 			// Visible fields
-			wfInputLabel( wfMsg( 'hiderevision-prompt' ), 'revision[]', 'wpRevision', 10 ) .
+			wfInputLabel( wfMsgHTML( 'hiderevision-prompt' ), 'revision[]', 'wpRevision', 10 ) .
 			"<br />" .
-			wfInputLabel( wfMsg( 'hiderevision-reason' ), 'wpReason', 'wpReason', 60 ) .
+			wfInputLabel( wfMsgHTML( 'hiderevision-reason' ), 'wpReason', 'wpReason', 60 ) .
 			"<br />" .
-			wfSubmitButton( wfMsg( 'hiderevision-continue' ) ) .
+			wfSubmitButton( wfMsgHTML( 'hiderevision-continue' ) ) .
 			
 			wfCloseElement( 'form' ) );
 	}
@@ -224,9 +222,9 @@
 			
 			// Visible fields
 			"<br />" .
-			wfInputLabel( wfMsg( 'hiderevision-reason' ), 'wpReason', 'wpReason', 60, $this->mReason ) .
+			wfInputLabel( wfMsgHTML( 'hiderevision-reason' ), 'wpReason', 'wpReason', 60, $this->mReason ) .
 			"<br />" .
-			wfSubmitButton( wfMsg( 'hiderevision-submit' ) ) .
+			wfSubmitButton( wfMsgHTML( 'hiderevision-submit' ) ) .
 			
 			// Hidden fields
 			$this->revisionFields() .
@@ -352,16 +350,16 @@
 function hrHideRevisions( $dbw, $title, $revisions, $timestamps, $reason ) {
 	// Live revisions
 	foreach( $revisions as $id ) {
-		$success[] = wfMsg( 'hiderevision-status', $id,
-			wfMsg( hrHideRevision( $dbw, $id, $reason ) ) );
+		$success[] = wfMsgHTML( 'hiderevision-status', $id,
+			wfMsgHTML (hrHideRevision( $dbw, $id, $reason ) ) );
 	}
 	
 	// Archived revisions
 	foreach( $timestamps as $timestamp ) {
 		global $wgLang;
-		$success[] = wfMsg( 'hiderevision-archive-status',
+		$success[] = wfMsgHTML( 'hiderevision-archive-status',
 			$wgLang->timeanddate( $timestamp ),
-			wfMsg( hrHideArchivedRevision( $dbw, $title,
+			wfMsgHTML( hrHideArchivedRevision( $dbw, $title,
 				$timestamp, $reason ) ) );
 	}
 	return $success;
@@ -483,7 +481,9 @@
 function wfSpecialOversight( $par=null ) {
 	global $wgRequest, $wgUser;
 	$revision = $wgRequest->getIntOrNull( 'revision' );
-	if( is_null( $revision ) ) {
+	if ( $wgRequest->getCheck( 'diff' ) && !is_null( $revision )) {
+		sosShowDiff( $revision);
+	} else if( is_null( $revision ) ) {
 		sosShowList();
 	} else {
 		sosShowRevision( $revision );
@@ -498,6 +498,7 @@
 		array( 'hidden_on_timestamp < ' . $dbr->addQuotes( $fromTime ) ) );
 	
 	global $wgOut;
+	$wgOut->addWikiText( wfMsgNoTrans( 'oversight-header' ) );
 	$wgOut->addHtml( '<ul>' );
 	while( $row = $dbr->fetchObject( $result ) ) {
 		$wgOut->addHtml( sosListRow( $row ) );
@@ -548,14 +549,18 @@
 	$userPage = Title::makeTitle( NS_USER, $row->user_name );
 	$victim = Title::makeTitle( $row->page_namespace, $row->page_title );
 	return "<li>(" .
-		$skin->makeLinkObj( $self, wfMsgHtml( 'oversight-view' ),
+		$skin->makeKnownLinkObj( $self, wfMsgHTML( 'oversight-view' ),
 			'revision=' . $row->rev_id ) .
 		") " .
+		"(" .
+		$skin->makeKnownLinkObj( $self, wfMsgHTML( 'diff' ),
+			'revision=' . $row->rev_id . '&diff=1') .
+		") " .
 		$wgLang->timeanddate( $row->hidden_on_timestamp ) .
 		" " .
 		$skin->makeLinkObj( $userPage, htmlspecialchars( $userPage->getText() ) ) .
 		" " .
-		wfMsgHtml( 'oversight-log-hiderev', $skin->makeLinkObj( $victim ) ) .
+		wfMsgHTML( 'oversight-log-hiderev', $skin->makeLinkObj( $victim ) ) .
 		" " .
 		$skin->commentBlock( $row->hidden_reason ) .
 		"</li>\n";
@@ -571,12 +576,16 @@
 		$info = sosListRow( $row );
 		$list = sosRevisionInfo( $row );
 		$rev = new Revision( $row );
-		
+		$text = $rev->getText();
 		$wgOut->addHtml(
 			"<ul>" .
 			$info .
 			"</ul>\n" .
-			$list .
+			$list );
+	    if ( $text === false ) {
+		$wgOut->addWikiText(wfmsg('hiderevision-error-missing')); 
+		} else {
+		$wgOut->addHtml(
 			"<div>" .
 			wfElement( 'textarea',
 				array(
@@ -584,8 +593,9 @@
 					'rows' => 25,
 					'wrap' => 'virtual',
 					'readonly' => 'readonly' ),
-				strval( $rev->getText() ) ) .
-			"</div>\n" );
+				$text) .
+			"</div>" );
+		}
 	}
 	$dbr->freeResult( $result );
 }
@@ -601,4 +611,52 @@
 	return $out;
 }
 
+function sosShowDiff( $revision )
+{
+	global $wgOut;
+	
+	$dbr = wfGetDB( DB_SLAVE );
+	$result = sosGetRevisions( $dbr, array( 'hidden_rev_id' => $revision ) );
+	
+	while( $row = $dbr->fetchObject( $result ) ) {
+		$info = sosListRow( $row );
+		$list = sosRevisionInfo( $row );
+		$rev = new Revision( $row );
+		$rev->mTitle = Title::makeTitle( $row->page_namespace, $row->page_title );
+		$prevId = $rev->mTitle->getPreviousRevisionID( $row->rev_id );
+		if ( $prevId ) {
+			$prev = Revision::newFromTitle( $rev->mTitle, $prevId );
+			$otext = strval( $prev->getText());
+		} else {
+			$wgOut->addHtml(
+			"<ul>" .
+			$info .
+			"</ul>\n" .
+			$list );
+			$wgOut->addWikiText( wfMsgNoTrans( 'oversight-nodiff' ) );
+			return;
+		}
+		$ntext = strval( $rev->getText());
+		
+		$wgOut->addHtml(
+			"<ul>" .
+			$info .
+			"</ul>\n" .
+			$list .
+			"<p><strong>" .
+			wfMsgHTML('oversight-difference') .
+			"</strong>" . 
+			"</p>" . 
+			"<div>" .
+			"<table border='0' width='98%' cellpadding='0' cellspacing='4' class='diff'>" . 
+			"<tr>" . 
+				"<td colspan='2' width='50%' align='center' class='diff-otitle'>" . wfMsgHTML('oversight-prev') . " (#$prevId)" . "</td>" . 
+				"<td colspan='2' width='50%' align='center' class='diff-ntitle'>" . wfMsgHTML('oversight-hidden') . "</td>" . 
+			"</tr>" .
+			DifferenceEngine::generateDiffBody( $otext, $ntext ) .
+			"</table>" . 
+			"</div>\n" );
+	}
+	$dbr->freeResult( $result );
+}
 ?>