feat: add --version CLI flag

src/PatchLight.Cli/CliApp.cs

@@ -21,6 +21,12 @@ public static async Task<int> RunAsync(string[] args)
                 return 0;
             }
 
+            if (command == "--version")
+            {
+                Render.Version(console);
+                return 0;
+            }
+
             var windows = SystemInfo.Read();
             if (!windows.IsWindows11 || windows.DisplayVersion is null)
                 throw new PatchLightException("PatchLight works on Windows 11 only for now.");

src/PatchLight.Cli/CliArgs.cs

@@ -11,7 +11,7 @@ public static string Command(string[] args)
     {
         if (args.Length == 0) return "check";
         var first = args[0].ToLowerInvariant();
-        if (first is "--help" or "-h" or "/?") return first;
+        if (first is "--help" or "-h" or "/?" or "--version") return first;
         return first.StartsWith('-') ? "check" : first;
     }
 

src/PatchLight.Cli/Render.cs

@@ -1,3 +1,4 @@
+using System.Reflection;
 using PatchLight.Core;
 using Spectre.Console;
 
@@ -136,10 +137,20 @@ public static void Help(IAnsiConsole console)
         console.MarkupLine("  [bold]patchlight history[/]              Recent updates and which one likely broke something");
         console.MarkupLine("  [bold]patchlight uninstall KB5124008[/]  Remove an installed update and keep it paused until it's fixed");
         console.MarkupLine("  [bold]patchlight --no-news[/]            Check without reading tech news sites");
+        console.MarkupLine("  [bold]patchlight --version[/]            Show the installed PatchLight version");
         console.WriteLine();
         console.MarkupLine("[grey]Pausing, resuming and removing need a terminal opened as administrator.[/]");
     }
 
+    public static void Version(IAnsiConsole console)
+    {
+        var assembly = typeof(CliApp).Assembly;
+        var version = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>()?.InformationalVersion
+            ?? assembly.GetName().Version?.ToString(3)
+            ?? "unknown";
+        console.MarkupLine($"PatchLight {Markup.Escape(version)}");
+    }
+
     private static string Why(ReleaseReason reason) => reason switch
     {
         ReleaseReason.Fixed => "Microsoft fixed its known problems",

tests/PatchLight.Tests/CliArgsTests.cs

@@ -50,6 +50,7 @@ public void Days_rejects_absurdly_long_periods(string value)
     [InlineData(new[] { "--no-news" }, "check")]
     [InlineData(new[] { "hold", "KB5127648" }, "hold")]
     [InlineData(new[] { "--help" }, "--help")]
+    [InlineData(new[] { "--version" }, "--version")]
     public void Command_defaults_to_check_when_only_options_are_given(string[] args, string command) =>
         Assert.Equal(command, CliArgs.Command(args));
 }

tests/PatchLight.Tests/RenderTests.cs

@@ -26,6 +26,13 @@ private static string Output(Action<TestConsole> render)
         return console.Output;
     }
 
+    [Fact]
+    public void Version_shows_the_product_and_build_version()
+    {
+        var text = Output(Render.Version);
+        Assert.Matches(@"^PatchLight \d+\.\d+\.\d+", text);
+    }
+
     [Fact]
     public void Red_update_shows_the_problem_and_how_to_pause_it()
     {