Update Check for ilspycmd dotnet tool

ICSharpCode.ILSpyCmd/DotNetToolUpdateChecker.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Linq;
+using System.Reflection;
+using System.Threading;
+using System.Threading.Tasks;
+
+using NuGet.Common;
+using NuGet.Protocol;
+using NuGet.Protocol.Core.Types;
+using NuGet.Versioning;
+
+namespace ICSharpCode.ILSpyCmd
+{
+	// Idea from https://github.com/ErikEJ/EFCorePowerTools/blob/master/src/GUI/efcpt/Services/PackageService.cs
+	internal static class DotNetToolUpdateChecker
+	{
+		static NuGetVersion CurrentPackageVersion()
+		{
+			return new NuGetVersion(Assembly.GetEntryAssembly()!.GetCustomAttribute<AssemblyInformationalVersionAttribute>()!
+				.InformationalVersion);
+		}
+
+		public static async Task<NuGetVersion> CheckForPackageUpdateAsync(string packageId)
+		{
+			try
+			{
+				using var cache = new SourceCacheContext();
+				var repository = Repository.Factory.GetCoreV3("https://api.nuget.org/v3/index.json");
+				var resource = await repository.GetResourceAsync<FindPackageByIdResource>().ConfigureAwait(false);
+
+				var versions = await resource.GetAllVersionsAsync(
+					packageId,
+					cache,
+					new NullLogger(),
+					CancellationToken.None).ConfigureAwait(false);
+
+				var latestVersion = versions.Where(v => v.Release == "").MaxBy(v => v);
+				if (latestVersion > CurrentPackageVersion())
+				{
+					return latestVersion;
+				}
+			}
+#pragma warning disable RCS1075 // Avoid empty catch clause that catches System.Exception.
+			catch (Exception)
+			{
+			}
+#pragma warning restore RCS1075 // Avoid empty catch clause that catches System.Exception.
+
+			return null;
+		}
+	}
+}

ICSharpCode.ILSpyCmd/ICSharpCode.ILSpyCmd.csproj

@@ -49,11 +49,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="3.1.0" />
-    <PackageReference Include="System.IO.FileSystem.Primitives" Version="4.3.0" />
-    <PackageReference Include="System.Runtime.Handles" Version="4.3.0" />
-    <PackageReference Include="System.Runtime.InteropServices" Version="4.3.0" />
-    <PackageReference Include="System.Text.Encoding.Extensions" Version="4.3.0" />
+    <PackageReference Include=" McMaster.Extensions.Hosting.CommandLine" Version="4.0.2" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="6.0.1" />
+    <PackageReference Include="NuGet.Protocol" Version="6.6.1" />
   </ItemGroup>
 
   <Target Name="ILSpyUpdateAssemblyInfo" AfterTargets="ResolveProjectReferences">

ICSharpCode.ILSpyCmd/IlspyCmdProgram.cs

@@ -8,6 +8,7 @@
 using System.Reflection.Metadata;
 using System.Reflection.PortableExecutable;
 using System.Threading;
+using System.Threading.Tasks;
 
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.CSharp;
@@ -21,6 +22,10 @@
 
 using McMaster.Extensions.CommandLineUtils;
 
+using Microsoft.Extensions.Hosting;
+
+using NuGet.Versioning;
+
 namespace ICSharpCode.ILSpyCmd
 {
 	[Command(Name = "ilspycmd", Description = "dotnet tool for decompiling .NET assemblies and generating portable PDBs",
@@ -48,7 +53,9 @@ into nicely nested directories.
 		MemberName = nameof(DecompilerVersion))]
 	class ILSpyCmdProgram
 	{
-		public static int Main(string[] args) => CommandLineApplication.Execute<ILSpyCmdProgram>(args);
+		// https://natemcmaster.github.io/CommandLineUtils/docs/advanced/generic-host.html
+		// https://github.com/natemcmaster/CommandLineUtils/blob/main/docs/samples/dependency-injection/generic-host/Program.cs
+		public static Task<int> Main(string[] args) => new HostBuilder().RunCommandLineApplicationAsync<ILSpyCmdProgram>(args);
 
 		[FilesExist]
 		[Required]
@@ -92,22 +99,37 @@ class ILSpyCmdProgram
 
 		[DirectoryExists]
 		[Option("-r|--referencepath <path>", "Path to a directory containing dependencies of the assembly that is being decompiled.", CommandOptionType.MultipleValue)]
-		public string[] ReferencePaths { get; } = new string[0];
+		public string[] ReferencePaths { get; }
 
 		[Option("--no-dead-code", "Remove dead code.", CommandOptionType.NoValue)]
 		public bool RemoveDeadCode { get; }
 
 		[Option("--no-dead-stores", "Remove dead stores.", CommandOptionType.NoValue)]
 		public bool RemoveDeadStores { get; }
 
-		[Option("-d|--dump-package", "Dump package assembiles into a folder. This requires the output directory option.", CommandOptionType.NoValue)]
+		[Option("-d|--dump-package", "Dump package assemblies into a folder. This requires the output directory option.", CommandOptionType.NoValue)]
 		public bool DumpPackageFlag { get; }
 
 		[Option("--nested-directories", "Use nested directories for namespaces.", CommandOptionType.NoValue)]
 		public bool NestedDirectories { get; }
 
-		private int OnExecute(CommandLineApplication app)
+		[Option("--disable-updatecheck", "If using ilspycmd in a tight loop or fully automated scenario, you might want to disable the automatic update check.", CommandOptionType.NoValue)]
+		public bool DisableUpdateCheck { get; }
+
+		private readonly IHostEnvironment _env;
+		public ILSpyCmdProgram(IHostEnvironment env)
 		{
+			_env = env;
+		}
+
+		private async Task<int> OnExecuteAsync(CommandLineApplication app)
+		{
+			Task<NuGetVersion> updateCheckTask = null;
+			if (!DisableUpdateCheck)
+			{
+				updateCheckTask = DotNetToolUpdateChecker.CheckForPackageUpdateAsync("ilspycmd");
+			}
+
 			TextWriter output = System.Console.Out;
 			string outputDirectory = ResolveOutputDirectory(OutputDirectory);
 
@@ -156,6 +178,16 @@ private int OnExecute(CommandLineApplication app)
 			finally
 			{
 				output.Close();
+
+				if (null != updateCheckTask)
+				{
+					var latestVersion = await updateCheckTask;
+					if (null != latestVersion)
+					{
+						Console.WriteLine("You are not using the latest version of the tool, please update.");
+						Console.WriteLine($"Latest version is '{latestVersion}'");
+					}
+				}
 			}
 
 			int PerformPerFileAction(string fileName)
@@ -240,7 +272,7 @@ CSharpDecompiler GetDecompiler(string assemblyFileName)
 		{
 			var module = new PEFile(assemblyFileName);
 			var resolver = new UniversalAssemblyResolver(assemblyFileName, false, module.Metadata.DetectTargetFrameworkId());
-			foreach (var path in ReferencePaths)
+			foreach (var path in (ReferencePaths ?? Array.Empty<string>()))
 			{
 				resolver.AddSearchDirectory(path);
 			}
@@ -278,7 +310,7 @@ ProjectId DecompileAsProject(string assemblyFileName, string projectFileName)
 		{
 			var module = new PEFile(assemblyFileName);
 			var resolver = new UniversalAssemblyResolver(assemblyFileName, false, module.Metadata.DetectTargetFrameworkId());
-			foreach (var path in ReferencePaths)
+			foreach (var path in (ReferencePaths ?? Array.Empty<string>()))
 			{
 				resolver.AddSearchDirectory(path);
 			}