add -version app starter

platform/platform-impl/src/com/intellij/help/impl/ShowProductVersion.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2000-2016 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 com.intellij.help.impl;
+
+import com.intellij.openapi.application.ApplicationStarter;
+import com.intellij.openapi.application.ex.ApplicationInfoEx;
+
+/**
+ * @author Konstantin Bulenkov
+ */
+public class ShowProductVersion implements ApplicationStarter {
+  @Override
+  public String getCommandName() {
+    return "-version";
+  }
+
+  @Override
+  public void premain(String[] args) {
+
+  }
+
+  @SuppressWarnings("UseOfSystemOutOrSystemErr")
+  @Override
+  public void main(String[] args) {
+    System.out.println(ApplicationInfoEx.getInstanceEx().getFullVersion());
+    System.exit(0);
+  }
+}

platform/platform-resources/src/META-INF/PlatformExtensions.xml

@@ -7,6 +7,7 @@
     <appStarter implementation="com.intellij.help.impl.KeymapGenerator"/>
     <appStarter implementation="com.intellij.help.impl.IntentionDump"/>
     <appStarter implementation="com.intellij.help.impl.InspectionDump"/>
+    <appStarter implementation="com.intellij.help.impl.ShowProductVersion"/>
 
     <applicationService serviceInterface="com.intellij.openapi.components.impl.stores.IComponentStore"
                         serviceImplementation="com.intellij.configurationStore.ApplicationStoreImpl"/>