Handle error looking for init.ps1 in NuGet packages directory.

If there is an exception finding init.ps1 files when the solution is
opened then the unhandled exception dialog is shown. This can happen
if a NuGet package requires NuGet 3.0. This results in an
NuGetVersionNotSatisfiedException being thrown. Now when this happens
the error message is reported in the PowerShell console if it is open.

src/AddIns/Misc/PackageManagement/Project/Src/Scripting/PackageInitializationScriptsConsole.cs

@@ -17,12 +17,13 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System;
+using ICSharpCode.Scripting;
 
 namespace ICSharpCode.PackageManagement.Scripting
 {
 	public class PackageInitializationScriptsConsole
 	{
-		IPackageManagementConsoleHost consoleHost;
+		readonly IPackageManagementConsoleHost consoleHost;
 
 		public PackageInitializationScriptsConsole(
 			IPackageManagementConsoleHost consoleHost)
@@ -36,5 +37,13 @@ public void ExecuteCommand(string command)
 				consoleHost.ExecuteCommand(command);
 			}
 		}
+
+		public void WriteError(string message)
+		{
+			if (consoleHost.IsRunning) {
+				consoleHost.ScriptingConsole.WriteLine(message, ScriptingStyle.Error);
+				consoleHost.WritePrompt();
+			}
+		}
 	}
 }

src/AddIns/Misc/PackageManagement/Project/Src/Scripting/RunPackageInitializationScriptsOnSolutionOpen.cs

@@ -47,7 +47,11 @@ public class RunPackageInitializationScriptsOnSolutionOpen
 
 		void SolutionOpened(object sender, SolutionEventArgs e)
 		{
-			RunPackageInitializationScripts(e.Solution);
+			try {
+				RunPackageInitializationScripts(e.Solution);
+			} catch (Exception ex) {
+				scriptsConsole.WriteError(ex.Message);
+			}
 		}
 
 		void RunPackageInitializationScripts(ISolution solution)

src/AddIns/Misc/PackageManagement/Test/Src/Helpers/FakePackageInitializationScriptsInSolutionFactory.cs

@@ -28,10 +28,15 @@ public class FakePackageInitializationScriptsFactory : IPackageInitializationScr
 			new FakePackageInitializationScripts();
 
 		public ISolution SolutionPassedToCreatePackageInitializationScripts;
+
+		public Exception ExceptionToThrow;
 
 		public IPackageInitializationScripts CreatePackageInitializationScripts(
 			ISolution solution)
 		{
+			if (ExceptionToThrow != null)
+				throw ExceptionToThrow;
+
 			SolutionPassedToCreatePackageInitializationScripts = solution;
 			return FakePackageInitializationScripts;
 		}

src/AddIns/Misc/PackageManagement/Test/Src/Scripting/RunPackageInitializationScriptsOnSolutionOpenTests.cs

@@ -19,6 +19,7 @@
 using System;
 using ICSharpCode.PackageManagement.Design;
 using ICSharpCode.PackageManagement.Scripting;
+using ICSharpCode.Scripting;
 using ICSharpCode.Scripting.Tests.Utils;
 using ICSharpCode.SharpDevelop.Project;
 using NUnit.Framework;
@@ -102,5 +103,33 @@ public void Instance_SolutionOpenedAndHasNoPackageInitializationScripts_InvokeIn
 
 			Assert.IsFalse(contains);
 		}
+
+		[Test]
+		public void Instance_ExceptionThrownByScriptsFactory_ErrorMessageLoggedToConsole()
+		{
+			CreateRunner();
+			SolutionHasPackageInitializationScripts();
+			fakeConsoleHost.IsRunning = true;
+			fakeScriptsFactory.ExceptionToThrow = new Exception("Error");
+
+			OpenSolution();
+
+			Assert.AreEqual("Error", fakeScriptingConsole.TextPassedToWriteLine);
+			Assert.AreEqual(ScriptingStyle.Error, fakeScriptingConsole.ScriptingStylePassedToWriteLine);
+			Assert.IsTrue(fakeConsoleHost.IsWritePromptCalled);
+		}
+
+		[Test]
+		public void Instance_ExceptionThrownByScriptsFactoryButConsoleIsNotRunning_NoErrorMessageLoggedToConsole()
+		{
+			CreateRunner();
+			SolutionHasPackageInitializationScripts();
+			fakeConsoleHost.IsRunning = false;
+			fakeScriptsFactory.ExceptionToThrow = new Exception("Error");
+
+			OpenSolution();
+
+			Assert.IsNull(fakeScriptingConsole.TextPassedToWriteLine);
+		}
 	}
 }