nadekobot/NadekoBot.Core/Common/ModuleBehaviors/IModuleBehavior.cs

using Discord;
using Discord.WebSocket;
using System.Threading.Tasks;

namespace NadekoBot.Common.ModuleBehaviors
{
    public struct ModuleBehaviorResult
    {
        public bool Blocked { get; set; }
        public string NewInput { get; set; }

        public static ModuleBehaviorResult None() => new ModuleBehaviorResult
        {
            Blocked = false,
            NewInput = null,
        };

        public static ModuleBehaviorResult FromBlocked(bool blocked) => new ModuleBehaviorResult
        {
            Blocked = blocked,
            NewInput = null,
        };
    }

    public interface IModuleBehavior
    {
        /// <summary>
        /// Negative priority means it will try to apply as early as possible
        /// Positive priority menas it will try to apply as late as possible
        /// </summary>
        int Priority { get; }
        Task<ModuleBehaviorResult> ApplyBehavior(DiscordSocketClient client, IGuild guild, IUserMessage msg);
    }
}