KT-2297 Auto-insert closing brace on typing '{' after '$' in string literal

#KT-2297 fixed

idea/src/META-INF/plugin.xml

@@ -159,6 +159,7 @@
       <extendWordSelectionHandler implementation="org.jetbrains.jet.plugin.editor.wordSelection.JetStatementGroupSelectioner"/>
       <extendWordSelectionHandler implementation="org.jetbrains.jet.plugin.editor.wordSelection.JetCodeBlockSelectioner"/>
       <extendWordSelectionHandler implementation="org.jetbrains.jet.plugin.editor.wordSelection.JetListSelectioner"/>
+      <typedHandler implementation="org.jetbrains.jet.plugin.editor.KotlinTypedHandler" />
 
       <lang.documentationProvider language="JAVA" implementationClass="org.jetbrains.jet.plugin.JetQuickDocumentationProvider" order="first"/>
       <documentationProvider implementation="org.jetbrains.jet.plugin.JetQuickDocumentationProvider"/>

idea/src/org/jetbrains/jet/plugin/editor/KotlinTypedHandler.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2010-2012 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.editor;
+
+import com.intellij.codeInsight.CodeInsightSettings;
+import com.intellij.codeInsight.editorActions.TypedHandlerDelegate;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.project.Project;
+import com.intellij.psi.PsiDocumentManager;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.impl.source.tree.LeafPsiElement;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.psi.JetFile;
+import org.jetbrains.jet.lexer.JetTokens;
+
+/**
+ * @author Evgeny Gerashchenko
+ * @since 7/16/12
+ */
+public class KotlinTypedHandler extends TypedHandlerDelegate {
+    @Override
+    public Result charTyped(char c, Project project, Editor editor, @NotNull PsiFile file) {
+        if (!(file instanceof JetFile) || !CodeInsightSettings.getInstance().AUTOINSERT_PAIR_BRACKET) {
+            return Result.CONTINUE;
+        }
+        if (c == '{') {
+            PsiDocumentManager.getInstance(project).commitAllDocuments();
+            int offset = editor.getCaretModel().getOffset();
+            PsiElement previousElement = file.findElementAt(offset - 1);
+            if (previousElement instanceof LeafPsiElement
+                    && ((LeafPsiElement) previousElement).getElementType() == JetTokens.LONG_TEMPLATE_ENTRY_START) {
+                editor.getDocument().insertString(offset, "}");
+            }
+            return Result.STOP;
+        }
+        return Result.CONTINUE;
+    }
+}

idea/tests/org/jetbrains/jet/editor/TypedHandlerTest.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2010-2012 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.editor;
+
+import com.intellij.testFramework.EditorTestUtil;
+import com.intellij.testFramework.LightCodeInsightTestCase;
+
+/**
+ * @author Evgeny Gerashchenko
+ * @since 7/16/12
+ */
+public class TypedHandlerTest extends LightCodeInsightTestCase {
+    public void testTypeStringTemplateStart() throws Exception {
+        configureFromFileText("a.kt", "val x = \"$<caret>\"");
+        EditorTestUtil.performTypingAction(getEditor(), '{');
+        checkResultByText("val x = \"${}\"");
+    }
+}