Subcommands with Oakton

Program.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using Lamar;
using Oakton;
using MyApp.Commands;

namespace MyApp
{
    internal class Program
    {
        private static readonly string[] Commands = { "volume", "container", "etc" };

        private static async Task<int> Main(string[] args)
        {
            // Check a valid top-level command was specified
            if (args.Length == 0 || !Commands.Contains(args[0]) || args[0] == "help" || args[0] == "--help")
                ShowHelp();

            var command = args[0];

            // Now we have the command, we only need any remaining arguments
            args = args.Skip(1).ToArray(); 

            var container = Bootstrapper.Initialize();

            CommandExecutor executor;
            switch (command)
            {
                case "volume":
                    executor = GetVolumeCommand(container);
                    break;
                case "container":
                    executor = GetContainerCommand(container);
                    break;
                default:
                    ShowHelp();
                    return 1;
            }

            return await executor.ExecuteAsync(args);
        }

        private static CommandExecutor GetVolumeCommand(IContainer container)
        {
            var executor = CommandExecutor.For(x =>
            {
                x.RegisterCommand<ListVolumeCommand>();
                x.RegisterCommand<CreateVolumeCommand>();
                x.RegisterCommand<RemoveVolumeCommand>();
            }, new LamarCommandCreator(container));

            return executor;
        }

        private static CommandExecutor GetContainerCommand(IContainer container)
        {
            var executor = CommandExecutor.For(x =>
            {
                x.RegisterCommand<ListContainerCommand>();
                x.RegisterCommand<CreateContainerCommand>();
                x.RegisterCommand<RemoveContainerCommand>();
            }, new LamarCommandCreator(container));

            return executor;
        }
        
        private static void ShowHelp()
        {
            ConsoleWriter.Write("Help text here");
            Environment.Exit(1);
        }
    }
}