Make update check explicit, see #3101

ICSharpCode.ILSpyCmd/DotNetToolUpdateChecker.cs

@@ -11,6 +11,8 @@ using NuGet.Versioning;
 
 namespace ICSharpCode.ILSpyCmd
 {
+	internal record PackageCheckResult(NuGetVersion RunningVersion, NuGetVersion LatestVersion, bool UpdateRecommendation);
+
 	// Idea from https://github.com/ErikEJ/EFCorePowerTools/blob/master/src/GUI/efcpt/Services/PackageService.cs
 	internal static class DotNetToolUpdateChecker
 	{
@@ -20,7 +22,7 @@ namespace ICSharpCode.ILSpyCmd
 				.InformationalVersion);
 		}
 
-		public static async Task<NuGetVersion> CheckForPackageUpdateAsync(string packageId)
+		public static async Task<PackageCheckResult> CheckForPackageUpdateAsync(string packageId)
 		{
 			try
 			{
@@ -35,10 +37,10 @@ namespace ICSharpCode.ILSpyCmd
 					CancellationToken.None).ConfigureAwait(false);
 
 				var latestVersion = versions.Where(v => v.Release == "").MaxBy(v => v);
-				if (latestVersion > CurrentPackageVersion())
-				{
-					return latestVersion;
-				}
+				var runningVersion = CurrentPackageVersion();
+				int comparisonResult = latestVersion.CompareTo(runningVersion, VersionComparison.Version);
+
+				return new PackageCheckResult(runningVersion, latestVersion, comparisonResult > 0);
 			}
 #pragma warning disable RCS1075 // Avoid empty catch clause that catches System.Exception.
 			catch (Exception)

ICSharpCode.ILSpyCmd/IlspyCmdProgram.cs

@@ -124,7 +124,7 @@ Examples:
 
 		private async Task<int> OnExecuteAsync(CommandLineApplication app)
 		{
-			Task<NuGetVersion> updateCheckTask = null;
+			Task<PackageCheckResult> updateCheckTask = null;
 			if (!DisableUpdateCheck)
 			{
 				updateCheckTask = DotNetToolUpdateChecker.CheckForPackageUpdateAsync("ilspycmd");
@@ -181,11 +181,11 @@ Examples:
 
 				if (null != updateCheckTask)
 				{
-					var latestVersion = await updateCheckTask;
-					if (null != latestVersion)
+					var checkResult = await updateCheckTask;
+					if (null != checkResult && checkResult.UpdateRecommendation)
 					{
 						Console.WriteLine("You are not using the latest version of the tool, please update.");
-						Console.WriteLine($"Latest version is '{latestVersion}'");
+						Console.WriteLine($"Latest version is '{checkResult.LatestVersion}' (yours is '{checkResult.RunningVersion}')");
 					}
 				}
 			}