cli-ninject-hosting/CustomHostingDemo/HelloCommand.cs

using CustomHostingDemo.Logging;
using Microsoft.Extensions.Configuration;
using System;
using System.CommandLine;
using System.CommandLine.Invocation;
using System.Threading.Tasks;

namespace CustomHostingDemo
{
    public class HelloCommand : CustomCommand<HelloCommand.HelloArgs>
    {
        public HelloCommand()
            : base("hello", "says hello", typeof(DefaultHandler))
        {
            AddArgument(new Argument<DateTime>("date", () => DateTime.Today));
            AddOption(new Option<bool>("--verbose"));
        }

        public class HelloArgs : IDefaultArgs
        {
            public DateTime Date { get; set; }
            public bool Verbose { get; set; }
        }

        public class DefaultHandler : ICommandHandler<HelloArgs>
        {
            private readonly ICliLogger _logger;
            private readonly IConfiguration _config;

            public DefaultHandler(ICliLogger logger, IConfiguration config)
            {
                _logger = logger;
                _config = config;
            }

            public Task<int> InvokeAsync(InvocationContext context, HelloArgs args)
            {
                _logger.LogContent($"Hello {_config["Hello"]}! How are you?");
                _logger.LogInfo($"P: --date {args.Date}");
                _logger.LogInfo($"P: --verbose {args.Verbose}");

                _logger.LogWarning("This is your last warning!");
                _logger.LogError("Just kidding. This is a test.");

                return Task.FromResult(0);
            }
        }
    }
}