How to add named commands when using CreateHostBuilder

[brady-kelly]

Your DI example with CreateHostBuilder only includes a public method command, and other examples use CreateBuilder and app.AddCommand(), but I can't find any api on the host to add commands in a similar way. Is this possible?

[marschelpoet]

Are you referring to this example?
https://github.com/mayuki/Cocona/blob/3ff50b0fc8569b9b7c75ecfdcae4cbb08f44e4d1/samples/InAction.DependencyInjection/Program.cs

From what I can deduct, the currently release package 2.2.0 does not have an overload available to add commands to the CoconaAppHostBuilder in a function like manner like app.AddCommand. (Actually there is not even a Build() that would return the configurable app).

However, the way that the Run<T> function works, is that it turns the public methods into commands. If you only have a single public method, that will always be the entrypoint it seems, but if you add multiple, they become named commands:

using Cocona;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace CoconaSample.InAction.DependencyInjection;

class Program
{
    public Program(ILogger<Program> logger)
    {
        logger.LogInformation("Create Instance");
    }

    static void Main(string[] args)
    {
        CoconaApp.CreateHostBuilder()
            .ConfigureLogging(logging =>
            {
                logging.AddDebug();
            })
            .ConfigureServices(services =>
            {
                services.AddTransient<MyService>();
            })
            .Run<Program>(args);
    }

    public void Hello([FromService]MyService myService)
    {
        myService.Hello("Hello Konnichiwa!");
    }

    public void HelloAgain([FromService]MyService myService)
    {
        myService.Hello("Hello again Konnichiwa!");
    }
}

class MyService
{
    private readonly ILogger _logger;

    public MyService(ILogger<MyService> logger)
    {
        _logger = logger;
    }

    public void Hello(string message)
    {
        _logger.LogInformation(message);
    }
}