Add basic logging infrastructure

ICSharpCode.Decompiler/DecompilerEventSource.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Diagnostics.Tracing;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ICSharpCode.Decompiler.TypeSystem;
+using ICSharpCode.Decompiler.TypeSystem.Implementation;
+using Mono.Cecil;
+
+namespace ICSharpCode.Decompiler
+{
+	[EventSource(Name = "DecompilerEventSource")]
+	public sealed class DecompilerEventSource : EventSource
+	{
+		public static DecompilerEventSource Log = new DecompilerEventSource();
+
+		[Event(1, Level = EventLevel.Informational)]
+		public void Info(string text)
+		{
+			WriteEvent(1, text);
+		}
+	}
+}

ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj

@@ -46,6 +46,7 @@
 
   <ItemGroup>
     <PackageReference Include="System.Collections.Immutable" Version="1.3.0" />
+    <PackageReference Include="System.Diagnostics.Tracing" Version="4.3.0" />
     <PackageReference Include="System.ValueTuple" Version="4.3.0" />
   </ItemGroup>
 
@@ -257,6 +258,7 @@
     <Compile Include="Documentation\IdStringMemberReference.cs" />
     <Compile Include="Documentation\IdStringProvider.cs" />
     <Compile Include="Documentation\XmlDocumentationProvider.cs" />
+    <Compile Include="DecompilerEventSource.cs" />
     <Compile Include="IL\ControlFlow\AsyncAwaitDecompiler.cs" />
     <Compile Include="IL\ControlFlow\ControlFlowGraph.cs" />
     <Compile Include="IL\ControlFlow\StateRangeAnalysis.cs" />

ILSpy/Commands/SortAssemblyListCommand.cs

@@ -36,4 +36,13 @@ namespace ICSharpCode.ILSpy
 			return string.Compare(x.ShortName, y.ShortName, StringComparison.CurrentCulture);
 		}
 	}
+
+	[ExportMainMenuCommand(Menu = "_View", Header = "_Output", MenuIcon = "Images/ViewCode.png", MenuCategory = "View")]
+	sealed class ShowLog : SimpleCommand
+	{
+		public override void Execute(object parameter)
+		{
+			LogWindow.Instance.Show();
+		}
+	}
 }

ILSpy/ILSpy.csproj

@@ -126,6 +126,7 @@
     <Compile Include="Languages\Language.cs" />
     <Compile Include="Languages\Languages.cs" />
     <Compile Include="LoadedAssembly.cs" />
+    <Compile Include="LogWindow.xaml.cs" />
     <Compile Include="NativeMethods.cs" />
     <Compile Include="NavigationHistory.cs" />
     <Compile Include="NavigationState.cs" />
@@ -303,6 +304,9 @@
     <Page Include="SearchPane.xaml">
       <DependentUpon>SearchPane.cs</DependentUpon>
     </Page>
+    <Page Include="LogWindow.xaml">
+      <DependentUpon>LogWindow.xaml.cs</DependentUpon>
+    </Page>
     <Page Include="TextView\DecompilerTextView.xaml">
       <DependentUpon>DecompilerTextView.cs</DependentUpon>
     </Page>

ILSpy/LogWindow.xaml

@@ -0,0 +1,13 @@
+<UserControl x:Class="ICSharpCode.ILSpy.LogWindow"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:local="clr-namespace:ICSharpCode.ILSpy"
+			 xmlns:ae="http://icsharpcode.net/sharpdevelop/avalonedit"
+             mc:Ignorable="d" 
+             d:DesignHeight="300" d:DesignWidth="300">
+	<Grid>
+		<ae:TextEditor x:Name="log" FontFamily="Consolas" FontSize="10pt" IsReadOnly="True" />
+	</Grid>
+</UserControl>

ILSpy/LogWindow.xaml.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.Tracing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using ICSharpCode.AvalonEdit;
+
+namespace ICSharpCode.ILSpy
+{
+	partial class LogWindow : UserControl, IPane
+	{
+		static LogWindow instance;
+
+		public static LogWindow Instance {
+			get {
+				if (instance == null) {
+					App.Current.VerifyAccess();
+					instance = new LogWindow();
+				}
+				return instance;
+			}
+		}
+
+		readonly AvalonEditEventListener listener;
+
+		private LogWindow()
+		{
+			InitializeComponent();
+			this.listener = new AvalonEditEventListener(this.log);
+		}
+
+		public void Show()
+		{
+			if (!IsVisible) {
+				MainWindow.Instance.ShowInBottomPane("Output", this);
+			}
+		}
+
+		public void Closed()
+		{
+
+		}
+
+		class AvalonEditEventListener : EventListener
+		{
+			private TextEditor editor;
+
+			public AvalonEditEventListener(TextEditor editor)
+			{
+				this.editor = editor ?? throw new ArgumentNullException(nameof(editor));
+			}
+
+			protected override void OnEventSourceCreated(EventSource eventSource)
+			{
+				if (eventSource.Name == "DecompilerEventSource")
+					EnableEvents(eventSource, EventLevel.LogAlways, EventKeywords.All);
+			}
+
+			protected override void OnEventWritten(EventWrittenEventArgs eventData)
+			{
+				editor.Dispatcher.InvokeAsync(() => WriteToLog(eventData));
+			}
+
+			private void WriteToLog(EventWrittenEventArgs eventData)
+			{
+				editor.AppendText(eventData.Payload[0] + Environment.NewLine);
+				editor.ScrollToEnd();
+			}
+		}
+	}
+}

ILSpy/TextView/DecompilerTextView.cs

@@ -498,6 +498,7 @@ namespace ICSharpCode.ILSpy.TextView
 				if (i > 0)
 					textOutput.WriteLine();
 				
+				DecompilerEventSource.Log.Info($"Decompilation started...");
 				context.Options.CancellationToken.ThrowIfCancellationRequested();
 				nodes[i].Decompile(context.Language, textOutput, context.Options);
 			}