check command line mode before starting solution crawler and remote host.

I didn't make whole language service to not start since I wasn't sure end result of
such big change. that probably should be done by IDE team.

src/VisualStudio/Core/Def/Implementation/LanguageService/AbstractPackage`2.cs

@@ -3,6 +3,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.Design;
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Packaging;
 using Microsoft.CodeAnalysis.Remote;
 using Microsoft.CodeAnalysis.SymbolSearch;
@@ -68,7 +69,7 @@ protected override void Initialize()
             RegisterMiscellaneousFilesWorkspaceInformation(_miscellaneousFilesWorkspace);
 
             this.Workspace = this.CreateWorkspace();
-            if (this.Workspace != null)
+            if (IsInIdeMode(this.Workspace))
             {
                 // make sure solution crawler start once everything has been setup.
                 // this also should be started before any of workspace events start firing
@@ -132,7 +133,7 @@ protected override void Dispose(bool disposing)
                 _miscellaneousFilesWorkspace.StopSolutionCrawler();
             }
 
-            if (this.Workspace != null)
+            if (IsInIdeMode(this.Workspace))
             {
                 this.Workspace.StopSolutionCrawler();
 
@@ -151,6 +152,24 @@ protected override void Dispose(bool disposing)
 
         protected abstract string RoslynLanguageName { get; }
 
+        private bool IsInIdeMode(Workspace workspace)
+        {
+            return workspace != null && !IsInCommandLineMode();
+        }
+
+        private bool IsInCommandLineMode()
+        {
+            var shell = (IVsShell)this.GetService(typeof(SVsShell));
+
+            object result;
+            if (ErrorHandler.Succeeded(shell.GetProperty((int)__VSSPROPID.VSSPROPID_IsInCommandLineMode, out result)))
+            {
+                return (bool)result;
+            }
+
+            return false;
+        }
+
         private void EnableRemoteHostClientService()
         {
             ((RemoteHostClientServiceFactory.RemoteHostClientService)this.Workspace.Services.GetService<IRemoteHostClientService>()).Enable();