Add overload to allow one to set default command within the configuration delegate.

[AraHaan]

Is your feature request related to a problem? Please describe.
For basic apps one can set the default command outside of the .Configure function.
That is alright until you want for:

• An overload of .Configure that requires to pass in TSettings as a type parameter, which is then used for Action<IConfiguator<TSettings> to make use of the generic version of that interface, which can be used to configure additional things that is normally not possible without the generic version.

Describe the solution you'd like
For a change like this to be accepted, AraHaan@636ddb5

Describe alternatives you've considered
Perhaps having it as an extension method that extends CommandApp?

Additional context

// set the console title.
Console.Title = "Elskom workload cross-platform installer";

// Need to register the code pages provider for code that parses
// and later needs ISO-8859-2
Encoding.RegisterProvider(
    CodePagesEncodingProvider.Instance);

// Test that it loads
_ = Encoding.GetEncoding("ISO-8859-2");
var app = new CommandApp();
app.Configure(config =>
{
    _ = config.AddCommand<InstallCommand>("install").WithDescription("Installs the Workload.");
    _ = config.AddCommand<UninstallCommand>("uninstall").WithDescription("Uninstalls the Workload.");
    _ = config.AddCommand<UpdateCommand>("update").WithDescription("Updates the Workload.");
});

var finalArgs = new List<string>();
var firstArg = args.FirstOrDefault()?.Trim().ToLowerInvariant() ?? string.Empty;
if (firstArg is not "install" and not "uninstall" and not "update")
{
    finalArgs.Add("install");
}

if (args.Length != 0)
{
    finalArgs.AddRange(args);
}

using (NuGetHelper.HttpClient = new HttpClient())
{
    var result = await app.RunAsync(finalArgs).ConfigureAwait(false);
    Console.Title = "";
    return result;
}

This code above could be greatly simplified if I could configure using the overload version proposed here to set the default command instead of making a dummy list and possibly having bugs in my code, I then could also directly pass in args to app.RunAsync which will also improve performance of my application for free as well.

[AraHaan]

I guess another alternative would be adding a way to have AddCommand where one can specify it to be a default command (bool value with default of it being false) as well, with a name different from the default name for said default command. 😄

[patriksvensson]

@AraHaan You can set the default command by using CommandApp<T>.

var app = new CommandApp<MyDefaultCommand>();

[AraHaan]

@AraHaan You can set the default command by using CommandApp<T>.

var app = new CommandApp<MyDefaultCommand>();

Could, but that does not allow one to specify a specific name for the default command either. So I am thinking of ways around that as well.

[patriksvensson]

@AraHaan I'm sorry, but I don't quite follow what you mean.

[patriksvensson]

This is how Spectre.Console default commands are designed to work. If you want to add a named command as well, you do it in the configure phase.

var app = new CommandApp<InstallCommand>(); // Default command
app.Configure(config =>
{
    _ = config.AddCommand<InstallCommand>("install").WithDescription("Installs the Workload.");
    _ = config.AddCommand<UninstallCommand>("uninstall").WithDescription("Uninstalls the Workload.");
    _ = config.AddCommand<UpdateCommand>("update").WithDescription("Updates the Workload.");
});

[FrankRay78]

This is how Spectre.Console default commands are designed to work. If you want to add a named command as well, you do it in the configure phase.

Has this now cleared up your issue @AraHaan?

[AraHaan]

Yes, but I would like a way to do it with and without the generic version of CommandApp which would be great (not to mention help unify both versions similarly which would help make it more maintainable as then the generic version could be defined as this exactly:

public class CommandApp<T> : CommandApp
{
   // ctor that bootstraps setting the passed in T as the default command.
}

[patriksvensson]

You can do that now as well:

var app = new CommandApp();
app.SetDefaultCommand<InstallCommand>();
app.Configure(config =>
{
    _ = config.AddCommand<InstallCommand>("install").WithDescription("Installs the Workload.");
    _ = config.AddCommand<UninstallCommand>("uninstall").WithDescription("Uninstalls the Workload.");
    _ = config.AddCommand<UpdateCommand>("update").WithDescription("Updates the Workload.");
});

[FrankRay78]

Hi @AraHaan, I'm just triaging the open CLI issues. Has Patrik's response fully addressed your ask?

[FrankRay78]

Closing. Feel free to reopen if something remains outstanding.