CustomCommand.cs

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using System;
using System.Threading;
using System.Threading.Tasks;

namespace Tgstation.Server.Host.Components.Chat.Commands
{
    public sealed class CustomCommand : ICommand
    {
        public string Name { get; set; }

        public string HelpText { get; set; }

        public bool AdminOnly { get; set; }

        ICustomCommandHandler handler;

        public void SetHandler(ICustomCommandHandler handler)
        {
            if (this.handler != null)
                throw new InvalidOperationException("SetHandler() already called!");
            this.handler = handler ?? throw new ArgumentNullException(nameof(handler));
        }

        public Task<string> Invoke(string arguments, ChatUser user, CancellationToken cancellationToken)
        {
            if (handler == null)
                throw new InvalidOperationException("SetHandler() has not been called!");
            return handler.HandleChatCommand(Name, arguments, user, cancellationToken);
        }
    }
}