Add list-features, --enable-features, & --disable-features (#93)

* Add list-features, --enable-features, & --disable-features

* Update command description to include full name (GitHub Actions Importer)

Co-authored-by: Ethan Dennis <ethanis@github.com>

* Fix typo in enable features option

---------

Co-authored-by: Ethan Dennis <ethanis@github.com>

src/ActionsImporter/Commands/Common.cs

@@ -63,7 +63,25 @@ public static Command AppendTransformerOptions(this Command command)
         command.AddGlobalOption(
             new Option<string>(new[] { "--features" })
             {
-                Description = "Features to enable in transformed workflows."
+                Description = "GHES features to enable in transformed workflows."
+            }
+        );
+
+        command.AddGlobalOption(
+            new Option<string[]>(new[] { "--enable-features" })
+            {
+                Description = "A list of features to enable by name. Use `gh actions-importer list-features` to see available features.",
+                IsRequired = false,
+                AllowMultipleArgumentsPerToken = true
+            }
+        );
+
+        command.AddGlobalOption(
+            new Option<string[]>(new[] { "--disable-features" })
+            {
+                Description = "A list of features to disable by name. Use `gh actions-importer list-features` to see available features.",
+                IsRequired = false,
+                AllowMultipleArgumentsPerToken = true
             }
         );
 

src/ActionsImporter/Commands/ListFeatures.cs

@@ -0,0 +1,16 @@
+using System.Collections.Immutable;
+using System.CommandLine;
+
+namespace ActionsImporter.Commands;
+
+public class ListFeatures : ContainerCommand
+{
+    public ListFeatures(string[] args) : base(args)
+    {
+    }
+
+    protected override string Name => "list-features";
+    protected override string Description => "List the available feature flags for GitHub Actions Importer.";
+
+    protected override ImmutableArray<Option> Options => ImmutableArray.Create<Option>();
+}

src/ActionsImporter/Program.cs

@@ -28,7 +28,8 @@
     new Audit(args).Command(app),
     new Forecast(args).Command(app),
     new DryRun(args).Command(app),
-    new Migrate(args).Command(app)
+    new Migrate(args).Command(app),
+    new ListFeatures(args).Command(app)
 };
 
 var parser = new CommandLineBuilder(command)