Added an ExitCode to Autorest.exe (Azure#966)

AutoRest/AutoRest/AutoRest.csproj

@@ -31,6 +31,7 @@
     <Compile Include="..\..\Tools\AssemblyVersionInfo.cs">
       <Link>Properties\AssemblyVersionInfo.cs</Link>
     </Compile>
+    <Compile Include="ExitCode.cs" />
     <Compile Include="GlobalSuppressions.cs" />
     <Compile Include="HelpExample.cs" />
     <Compile Include="HelpGenerator.cs" />
@@ -70,4 +71,4 @@
     </Content>
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
-</Project>
+</Project>

AutoRest/AutoRest/ExitCode.cs

@@ -0,0 +1,14 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+namespace Microsoft.Rest.Generator.Cli
+{
+    /// <summary>
+    /// Available exit codes.
+    /// </summary>
+    public enum ExitCode : int
+    {
+        Success = 0,
+        Error = 1
+    }
+}

AutoRest/AutoRest/Program.cs

@@ -12,8 +12,10 @@ namespace Microsoft.Rest.Generator.Cli
 {
     internal class Program
     {
-        private static void Main(string[] args)
+        private static int Main(string[] args)
         {
+            int exitCode = (int)ExitCode.Error;
+
             try
             {
                 Settings settings = null;
@@ -69,6 +71,7 @@ private static void Main(string[] args)
                         {
                             Console.WriteLine(Resources.GenerationComplete,
                                 settings.CodeGenerator, settings.Input);
+                            exitCode = (int)ExitCode.Success;
                         }
                     }
 
@@ -91,6 +94,7 @@ private static void Main(string[] args)
                 Console.Error.WriteLine(Resources.ConsoleErrorMessage, exception.Message);
                 Console.Error.WriteLine(Resources.ConsoleErrorStackTrace, exception.StackTrace);
             }
+            return exitCode;
         }
 
         /// <summary>