Commands.NET.Hosting 1.0.0-alpha2

Commands.NET

Commands.NET is a robust no-nonsense command library that makes creating and processing queries easy for any* interactive platform. It implements a modular, easy to implement pipeline for registering and executing commands, as well as a wide range of customization options to make development on different platforms as easy as possible.

*This includes console-input, game-chat, social platforms like Discord, Slack, Messenger & much, much more.

• Features
• Additional Packages
• Getting Started

Features

Type Conversion

For raw input, automated conversion to fit command signature is supported by TypeConverter's. ValueType, Enum and nullable variant types are automatically parsed by the framework and populate commands as below:

...
[Command("test")]
public void Test(int param1, DateTime param2)
{
    Console.WriteLine("{0}, {1}", param1, param2);
}
...

• This will automatically parse int by using the default int.TryParse implementation, and will do the same for the DateTime.

Outside of this, implementing and adding your own TypeConverter's is also supported to handle command signatures with normally unsupported types.

See feature documentation for more.

Preconditions

Implementing PreconditionAttribute creates a new evaluation to add in the set of attributes defined above command definitions. When a command is attempted to be executed, it will walk through every precondition present and abort execution if any of them fail.

...
[CustomPrecondition]
[Command("test")]
public async Task Test()
{
    
}
...

See feature documentation for more.

Dependency Injection

You can provide an IServiceProvider at execution to inject modules with dependencies, in accordance to the conventions Microsoft.Extensions.DependencyInjection follows. The IServiceProvider has a number of extensions that are suggested to be used when writing your codebase with Commands.NET. These extensions serve you and the program, reducing boilerplate in the application setup.

...
var services = new ServiceCollection()
    .ConfigureCommands(configuration =>
    {
        configuration.WithAssemblies(Assembly.GetEntryAssembly());
    });
...

See feature documentation for more.

Informative Results

Commands.NET will return results for running commands through a ResultResolver. This resolver has a default implementation that can be configured through the CommandConfiguration

    ...
        configuration.ConfigureResultAction(async (context, result, services) =>
        {
            if (result.Success)
            {
                await Task.CompletedTask;
            }
            else
            {
                Console.WriteLine(result.Exception);
            }
        });
    ...

See feature documentation for more.

Customization

While already fully functional out of the box, the framework does not shy away from covering extensive applications with more specific needs, which in turn need more than the base features to function according to its developer's expectations.

Types such as CommandContext, ModuleBase, TypeConverter, PreconditionAttribute and Parser can all be inherited and custom ones created for environmental specifics, custom type conversion and more.

Reflection

The framework saves cached command data in its own reflection types. These types, such as CommandInfo, ArgumentInfo and ModuleInfo store informative data about a command, its root module and any submembers.

The reflection data is accessible in various ways, most commonly in scope during type conversion & precondition evaluation.

Additional Packages

Commands.NET is not without its own dependencies, but it tries its best to keep all dependencies within a trusted atmosphere, using packages only when they outweigh self-written implementations. So far, it only depends on packages published by official channels of the .NET ecosystem.

Dependency Injection

Having grown into a vital part of building effective and modern applications, Dependency Injection (DI) is no less important to be carried along in the equally modern Commands.NET. It integrates this feature deeply into its architecture and depends on it to function from the ground up.

For applications to function with Commands.NET, it is necessary to install DI functionality through Microsoft's publicized package(s):

    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="" />

This and other required packages can also be installed through the Package Manager, .NET CLI or from within your IDE.

Hosting

Carrying out further support within the .NET ecosystem, Commands.NET also introduces a hosting package for deploying apps with the .NET generic host.

For applications to function with Commands.NET.Hosting, it is necessary to install the hosting package that it also implements, also publicized by Microsoft itself:

    <PackageReference Include="Microsoft.Extensions.Hosting" Version="" />

The hosting extensions package publicized by Microsoft implements the packages necessary for the core component of Commands.NET, and does not expect to have its dependencies implemented alongside it.

For each of these packages, the minimum version is determined by Commands.NET itself, usually being the latest or equal to the target framework upon which it was released. It is suggested to choose the latest version at time of installation.

Getting Started

There are various resources available in order to get started with Commands.NET. Below, you can find samples and directions to the quick guide.

Quick Guide

You can find the quick guide here. This guide introduces you to the basics of defining modules, commands, and how to run them.

Samples

Samples are available to learn how to implement Commands.NET in your own programs.

• Commands.Samples.Console
  • Shows how to implement Commands.NET on a basic console application.
• Commands.Samples.Hosting
  • Shows how to implement Commands.NET on a hosted console application.