ModSupportTunneler.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using Loot.Ext;
using Terraria.ModLoader;

namespace Loot.ModSupport
{
    internal static class ModSupportTunneler
    {
        private static List<ModSupport> _modSupporters;

        public static T GetModSupport<T>() where T : ModSupport
        {
            return (T)_modSupporters?.FirstOrDefault(s => s.GetType() == typeof(T) || s.GetType().IsAssignableFrom(typeof(T)));
        }

        public static void Init()
        {
            foreach (var modSupporter in GetSupporters())
            {
                Mod supportingMod = modSupporter.GetSupportingMod();
                modSupporter.ModIsLoaded = supportingMod != null && modSupporter.CheckValidity(supportingMod);
            }
        }

        public static void AddServerSupport()
        {
            foreach (var modSupporter in GetSupporters())
            {
                Mod supportingMod = modSupporter.GetSupportingMod();
                if (modSupporter.ModIsLoaded)
                {
                    modSupporter.AddServerSupport(supportingMod);
                }
            }
        }

        public static void AddClientSupport()
        {
            foreach (var modSupporter in GetSupporters())
            {
                Mod supportingMod = modSupporter.GetSupportingMod();
                if (modSupporter.ModIsLoaded)
                {
                    modSupporter.AddClientSupport(supportingMod);
                }
            }
        }

        private static IEnumerable<ModSupport> GetSupporters()
        {
            return _modSupporters ??
                   (_modSupporters =
                       ReflectUtils.GetLootNonAbstractClasses(t => t.IsSubclassOf(typeof(ModSupport)))
                       .Select(t => (ModSupport)Activator.CreateInstance(t))
                       .ToList());
        }
    }
}