Write to an output window pane to avoid opening two files

CHANGELOG.md

@@ -7,7 +7,7 @@ All notable changes to the code converter will be documented here.
 ### Visual studio extension
 * Works reliably in VS2017
 * Instead of copy to clipboard, opens result as Visual Studio window for quick viewing
-* Opens conversion summary window to explain what's happened
+* Writes summary to output window to explain what's happened
 * Project context used for all conversions
 
 ### VB -> C# specific

Vsix/CodeConversion.cs

@@ -72,12 +72,12 @@ namespace CodeConverter.VsExtension
 
         private void ShowFirstResultAndConversionSummary(List<string> files, List<string> errors)
         {
-            if (files.Any()) {
-                VisualStudioInteraction.OpenFile(new FileInfo(files.First()));
-                files[0] = files[0] + " (opened in adjacent code window)";
-            }
+            VisualStudioInteraction.OutputWindow.ShowMessageToUser(GetConversionSummary(files, errors));
 
-            VisualStudioInteraction.NewTextWindow("Conversion result summary", GetConversionSummary(files, errors));
+            if (files.Any()) {
+                VisualStudioInteraction.OpenFile(new FileInfo(files.First())).SelectAll();
+                files[0] = files[0] + " (opened in code window)";
+            }
         }
 
         private string GetConversionSummary(IReadOnlyCollection<string> files, IReadOnlyCollection<string> errors)
@@ -90,7 +90,7 @@ namespace CodeConverter.VsExtension
             var summaryOfSuccesses = "";
             if (files.Any()) {
                 introSummary = "Code conversion completed";
-                summaryOfSuccesses = "The following files have been written to disk (but are not part of the solution):"
+                summaryOfSuccesses = "The following files have been written to disk:"
                     + Environment.NewLine + "* " + string.Join(Environment.NewLine + "* ", relativeFilePaths);
             }
 
@@ -103,7 +103,7 @@ namespace CodeConverter.VsExtension
                        + Environment.NewLine
                        + string.Join(Environment.NewLine, errors);
             } else {
-                WriteStatusBarText(introSummary);
+                WriteStatusBarText(introSummary + " - see output window for details");
                 return introSummary
                        + Environment.NewLine
                        + summaryOfSuccesses;

Vsix/VisualStudioInteraction.cs

@@ -18,7 +18,7 @@ using Microsoft.VisualStudio.TextManager.Interop;
 
 namespace CodeConverter.VsExtension
 {
-    static class VisualStudioInteraction
+    internal static class VisualStudioInteraction
     {
         public static VsDocument GetSingleSelectedItemOrDefault()
         {
@@ -76,24 +76,13 @@ namespace CodeConverter.VsExtension
             return Dte.ItemOperations.OpenFile(fileInfo.FullName, EnvDTE.Constants.vsViewKindTextView);
         }
 
-        public static Window NewTextWindow(string windowTitle, string windowContents)
+        public static void SelectAll(this Window window)
         {
-            var newTextWindow = Dte.ItemOperations.NewFile(Name: windowTitle, ViewKind: EnvDTE.Constants.vsViewKindTextView);
-            newTextWindow.AppendLine(windowContents);
-            return newTextWindow;
-        }
-
-        private static void AppendLine(this Window newTextWindow, string textToAppend)
-        {
-            var textSelection = (TextSelection) newTextWindow.Document.Selection;
-            textSelection.EndOfDocument();
-            textSelection.Text = Environment.NewLine + textToAppend;
-            textSelection.StartOfDocument();
+            ((TextSelection)window.Document.Selection).SelectAll();
         }
 
         private static DTE2 Dte => Package.GetGlobalService(typeof(DTE)) as DTE2;
 
-
         public static IReadOnlyCollection<Project> GetSelectedProjects(string projectExtension)
         {
             var items = GetSelectedSolutionExplorerItems<Solution>()
@@ -144,5 +133,40 @@ namespace CodeConverter.VsExtension
                 OLEMSGBUTTON.OLEMSGBUTTON_OK,
                 OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST);
         }
+
+        public static class OutputWindow
+        {
+            private const string PaneName = "Code Converter";
+            private static readonly Guid PaneGuid = new Guid("44F575C6-36B5-4CDB-AAAE-E096E6A446BF");
+            private static readonly Lazy<IVsOutputWindowPane> _outputPane = new Lazy<IVsOutputWindowPane>(CreateOutputPane);
+            
+            private static IVsOutputWindow GetOutputWindow()
+            {
+                IServiceProvider serviceProvider = new ServiceProvider(Dte as Microsoft.VisualStudio.OLE.Interop.IServiceProvider);
+                return serviceProvider.GetService(typeof(SVsOutputWindow)) as IVsOutputWindow;
+            }
+            private static IVsOutputWindowPane CreateOutputPane()
+            {
+                Guid generalPaneGuid = PaneGuid;
+                IVsOutputWindowPane pane;
+                var outputWindow = GetOutputWindow();
+                outputWindow.GetPane(ref generalPaneGuid, out pane);
+
+                if (pane == null) {
+                    outputWindow.CreatePane(ref generalPaneGuid, PaneName, 1, 1);
+                    outputWindow.GetPane(ref generalPaneGuid, out pane);
+                }
+
+                return pane;
+            }
+
+            public static void ShowMessageToUser(string message)
+            {
+                Dte.Windows.Item(EnvDTE.Constants.vsWindowKindOutput).Visible = true;
+                var ourOutputPane = _outputPane.Value;
+                ourOutputPane.OutputString(message);
+                ourOutputPane.Activate();
+            }
+        }
     }
 }