Rename JetClass should rename file too.

idea/src/META-INF/plugin.xml

@@ -94,6 +94,8 @@
 
       <psi.referenceContributor language="jet" order="after JetCompletionContributor" implementation="org.jetbrains.jet.plugin.references.JetReferenceContributor"/>
 
+      <renamePsiElementProcessor implementation="org.jetbrains.jet.plugin.refactoring.rename.RenameJetClassProcessor"/>
+
       <liveTemplateContext implementation="org.jetbrains.jet.plugin.liveTemplates.JetTemplateContextType$Generic"/>
       <liveTemplateContext implementation="org.jetbrains.jet.plugin.liveTemplates.JetTemplateContextType$Namespace"/>
       <liveTemplateContext implementation="org.jetbrains.jet.plugin.liveTemplates.JetTemplateContextType$Statement"/>

idea/src/org/jetbrains/jet/plugin/refactoring/rename/RenameJetClassProcessor.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2000-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.plugin.refactoring.rename;
+
+import com.intellij.openapi.util.text.StringUtil;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.refactoring.rename.RenamePsiElementProcessor;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.psi.JetClassOrObject;
+import org.jetbrains.jet.lang.psi.JetFile;
+
+import java.util.Map;
+
+/**
+ * User: Alefas
+ * Date: 21.02.12
+ */
+public class RenameJetClassProcessor extends RenamePsiElementProcessor {
+    @Override
+    public boolean canProcessElement(@NotNull PsiElement element) {
+        return element instanceof JetClassOrObject;
+    }
+
+    @Override
+    public void prepareRenaming(PsiElement element, String newName, Map<PsiElement, String> allRenames) {
+        JetClassOrObject clazz = (JetClassOrObject) element;
+        JetFile file = (JetFile) clazz.getContainingFile();
+
+        VirtualFile virtualFile = file.getVirtualFile();
+        if (virtualFile != null) {
+            String nameWithoutExtensions = virtualFile.getNameWithoutExtension();
+            if (nameWithoutExtensions.equals(clazz.getName())) {
+                allRenames.put(file, newName + "." + virtualFile.getExtension());
+            }
+        }
+        super.prepareRenaming(element, newName, allRenames);
+    }
+}