Got rid of "jet" file extension.

compiler/android-tests/tests/org/jetbrains/jet/compiler/android/CodegenTestsOnAndroidGenerator.java

@@ -155,7 +155,7 @@ public class CodegenTestsOnAndroidGenerator extends UsefulTestCase {
     }
 
     private static ClassFileFactory getFactoryFromText(String filePath, String text, JetCoreEnvironment jetEnvironment) {
-        JetFile psiFile = JetTestUtils.createFile("dummy.jet", text, jetEnvironment.getProject());
+        JetFile psiFile = JetTestUtils.createFile("dummy.kt", text, jetEnvironment.getProject());
         ClassFileFactory factory;
         try {
             factory = GenerationUtils.compileFileGetClassFileFactoryForTest(psiFile);

compiler/cli/src/org/jetbrains/jet/cli/jvm/compiler/JetCoreEnvironment.java

@@ -86,7 +86,6 @@ public class JetCoreEnvironment {
         applicationEnvironment.registerFileType(JetFileType.INSTANCE, "kts");
         applicationEnvironment.registerFileType(JetFileType.INSTANCE, "ktm");
         applicationEnvironment.registerFileType(JetFileType.INSTANCE, JetParserDefinition.KTSCRIPT_FILE_SUFFIX); // should be renamed to kts
-        applicationEnvironment.registerFileType(JetFileType.INSTANCE, "jet");
         applicationEnvironment.registerParserDefinition(new JavaParserDefinition());
         applicationEnvironment.registerParserDefinition(new JetParserDefinition());
 

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiFactory.java

@@ -154,7 +154,7 @@ public class JetPsiFactory {
 
     @NotNull
     public static JetFile createFile(Project project, String text) {
-        return createFile(project, "dummy.jet", text);
+        return createFile(project, "dummy.kt", text);
     }
 
     @NotNull

compiler/jet.as.java.psi/src/org/jetbrains/jet/asJava/LightClassUtil.java

@@ -87,7 +87,7 @@ public class LightClassUtil {
 
     @NotNull
     public static URL getBuiltInsDirUrl() {
-        String builtInFilePath = "/" + KotlinBuiltIns.BUILT_INS_PACKAGE_NAME_STRING + "/Library.jet";
+        String builtInFilePath = "/" + KotlinBuiltIns.BUILT_INS_PACKAGE_NAME_STRING + "/Library.kt";
 
         URL url = KotlinBuiltIns.class.getResource(builtInFilePath);
 

compiler/tests/org/jetbrains/jet/JetLiteFixture.java

@@ -70,7 +70,7 @@ public abstract class JetLiteFixture extends KotlinTestWithEnvironment {
     protected JetFile createPsiFile(@Nullable String testName, @Nullable String fileName, String text) {
         if (fileName == null) {
             Assert.assertNotNull(testName);
-            fileName = testName + ".jet";
+            fileName = testName + ".kt";
         }
         return JetTestUtils.createFile(fileName, text, getProject());
     }
@@ -93,7 +93,7 @@ public abstract class JetLiteFixture extends KotlinTestWithEnvironment {
     }
 
     protected void prepareForTest(String name) throws IOException {
-        String text = loadFile(name + ".jet");
+        String text = loadFile(name + ".kt");
         createAndCheckPsiFile(name, text);
     }
 

compiler/tests/org/jetbrains/jet/JetTestCaseBuilder.java

@@ -34,7 +34,7 @@ import static com.intellij.openapi.util.io.FileUtil.toSystemIndependentName;
 
 public abstract class JetTestCaseBuilder {
 
-    public static final FilenameFilter KOTLIN_FILTER = filterByExtension("kt", "jet", JetParserDefinition.KTSCRIPT_FILE_SUFFIX);
+    public static final FilenameFilter KOTLIN_FILTER = filterByExtension("kt", JetParserDefinition.KTSCRIPT_FILE_SUFFIX);
 
     @NotNull
     public static FilenameFilter filterByExtension(@NotNull final String... extensions) {

compiler/tests/org/jetbrains/jet/cfg/JetControlFlowTest.java

@@ -67,7 +67,7 @@ public class JetControlFlowTest extends JetLiteFixture {
     
     @Override
     protected void runTest() throws Throwable {
-        JetFile file = loadPsiFile(myName + ".jet");
+        JetFile file = loadPsiFile(myName + ".kt");
 
         Map<JetElement, Pseudocode> data = new LinkedHashMap<JetElement, Pseudocode>();
         AnalyzeExhaust analyzeExhaust = JetTestUtils.analyzeFile(file);