CreateScriptableObjectInstance script (removes the need for [CreateAssetMenu] attribute)

CreateScriptableObjectInstance.cs

using System.IO;
using UnityEditor;
using UnityEngine;

namespace ChrisDirkis.Utility.Editor {
    public class CreateScriptableObjectInstance : MonoBehaviour {
        private const string MenuItemAddress = "Assets/Create/Scriptable Object Instance";
        private const int Priority = int.MaxValue;

        [MenuItem(MenuItemAddress, priority = Priority)]
        private static void Create() {
            var selected = Selection.activeObject as MonoScript;
            if (selected && typeof(ScriptableObject).IsAssignableFrom(selected.GetClass())) {
                var newInstance = ScriptableObject.CreateInstance(selected.GetClass());

                var scriptPath = AssetDatabase.GetAssetPath(selected);
                var assetPath = Path.Combine(Path.GetDirectoryName(scriptPath), $"New {selected.GetClass().Name}.asset");

                // if this path is taken, we search for a new one
                var counter = 0;
                while (AssetDatabase.LoadMainAssetAtPath(assetPath)) {
                    counter++;
                    assetPath = Path.Combine(Path.GetDirectoryName(scriptPath), $"New {selected.GetClass().Name} ({counter}).asset");
                }

                AssetDatabase.CreateAsset(newInstance, assetPath);
                Selection.activeObject = newInstance;
            }
        }

        [MenuItem(MenuItemAddress, validate = true)]
        private static bool Validate() {
            var selected = Selection.activeObject as MonoScript;
            return selected && typeof(ScriptableObject).IsAssignableFrom(selected.GetClass());
        }
    }
}