[Unity] Resourcesロードのパス指定を自動化する

ResourceReferer.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Unity 5.5.0p3

namespace TSKT
{
    public class ResourceReferer<T> : ScriptableObject
        where T : Object
    {
        [SerializeField]
        string path;

        public ResourceLoader<T> Load()
        {
            return new ResourceLoader<T>(path);
        }

        [SerializeField]
        T asset;

        [HideInInspector]
        [SerializeField]
        string guid;

#if UNITY_EDITOR

        void OnValidate()
        {
            string fullPath = null;

            if (asset)
            {
                fullPath = UnityEditor.AssetDatabase.GetAssetPath(asset);
                guid = UnityEditor.AssetDatabase.AssetPathToGUID(fullPath);
            }
            else if (!string.IsNullOrEmpty(guid))
            {
                fullPath = UnityEditor.AssetDatabase.GUIDToAssetPath(guid);
            }

            if (!string.IsNullOrEmpty(fullPath))
            {
                var i = fullPath.IndexOf("/Resources/");
                if (i < 0)
                {
                    UnityEngine.Assertions.Assert.IsTrue(false, "asset has to be in Resources : " + fullPath);
                }
                else
                {
                    asset = null;
                    var resourcePath = fullPath.Remove(0, i + "/Resources/".Length);
                    var dir = System.IO.Path.GetDirectoryName(resourcePath);
                    var file = System.IO.Path.GetFileNameWithoutExtension(resourcePath);

                    var newPath = dir + "/" + file;
                    if (path != newPath)
                    {
                        path = newPath;
                        UnityEditor.EditorUtility.SetDirty(this);
                    }
                }
            }
        }
#endif
    }
}