[Bootstrapper] System.CommandLine: Add help text and command (#388)

* Remove LocalizableStrings.Designer.cs

* Use System.CommandLine

* Add real command parser

---------

Co-authored-by: Forgind <[email protected]>

Author: edvilme

src/dotnet-bootstrapper/BootstrapperCommandParser.cs

@@ -0,0 +1,50 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.CommandLine;
+using System.CommandLine.Builder;
+using System.CommandLine.Invocation;
+using System.CommandLine.Parsing;
+using System.Reflection;
+
+namespace Microsoft.DotNet.Tools.Bootstrapper
+{
+    internal static class BootstrapperCommandParser
+    {
+        public static Parser BootstrapParser;
+
+        public static RootCommand BootstrapperRootCommand = new RootCommand("dotnet bootstrapper");
+
+        public static readonly Command VersionCommand = new Command("--version");
+
+        private static readonly Lazy<string> _assemblyVersion =
+            new Lazy<string>(() =>
+            {
+                var assembly = Assembly.GetEntryAssembly() ?? Assembly.GetExecutingAssembly();
+                var assemblyVersionAttribute = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+                if (assemblyVersionAttribute == null)
+                {
+                    return assembly.GetName().Version.ToString();
+                }
+                else
+                {
+                    return assemblyVersionAttribute.InformationalVersion;
+                }
+            });
+
+        static BootstrapperCommandParser()
+        {
+            BootstrapperRootCommand.AddCommand(VersionCommand);
+            VersionCommand.Handler = CommandHandler.Create(() =>
+            {
+                Console.WriteLine(_assemblyVersion.Value);
+            });
+
+            BootstrapParser = new CommandLineBuilder(BootstrapperRootCommand)
+                .UseDefaults()
+                //  .UseHelpBuilder(context => new UninstallHelpBuilder(context.Console))
+                .Build();
+        }
+    }
+}

src/dotnet-bootstrapper/LocalizableStrings.Designer.cs

@@ -1,13 +1,17 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-namespace Microsoft.DotNet.Tools.Bootstrapper
+using System.CommandLine;
+using System.CommandLine.Builder;
+using System.CommandLine.Parsing;
+using System.IO;
+using System.Threading.Tasks;
+namespace Microsoft.DotNet.Tools.Bootstrapper;
+
+class Program
 {
-    internal class Program
+    static int Main(string[] args)
     {
-        internal static int Main(string[] args)
-        {
-            return 0;
-        }
+        return BootstrapperCommandParser.BootstrapParser.InvokeAsync(args).Result;
     }
 }

src/dotnet-bootstrapper/Program.cs

@@ -31,7 +31,8 @@ internal void ItReturnsZeroOnExit()
                     RedirectStandardOutput = true,
                     RedirectStandardError = true,
                     UseShellExecute = false,
-                    CreateNoWindow = true
+                    CreateNoWindow = true,
+                    Arguments = "--version"
                 }
             };