CustomCommand.cs

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using System;
using System.Threading;
using System.Threading.Tasks;
 
using Tgstation.Server.Host.Components.Interop;
 
namespace Tgstation.Server.Host.Components.Chat.Commands
{
    public sealed class CustomCommand : ICommand
    {
        public string Name { get; }
 
        public string HelpText { get; }
 
        public bool AdminOnly { get; }
 
        ICustomCommandHandler? handler;
 
        public CustomCommand(string name, string helpText, bool adminOnly)
        {
            Name = name ?? throw new ArgumentNullException(nameof(name));
            HelpText = helpText ?? throw new ArgumentNullException(nameof(helpText));
            AdminOnly = adminOnly;
        }
 
        public void SetHandler(ICustomCommandHandler handler)
        {
            if (this.handler != null)
                throw new InvalidOperationException("SetHandler() already called!");
            this.handler = handler ?? throw new ArgumentNullException(nameof(handler));
        }
 
        public ValueTask<MessageContent> 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);
        }
    }
}