com.alicizax.unity.animationflow/Editor/Misc/EditorResourceTool.cs

using System.Collections.Generic;
using UnityEngine;

namespace AlicizaX.AnimationFlow.Editor
{
    public static class EditorResourceTool
    {
        public static string editorAssets;

        public static bool LocateEditorAssets()
        {
            string projectPath = Application.dataPath;
            if (projectPath.EndsWith("/Assets"))
            {
                projectPath = projectPath.Remove(projectPath.Length - ("Assets".Length));
            }

            editorAssets = "Packages/com.alicizax.unity.animationflow/Editor/Styles";
            if (!System.IO.File.Exists(projectPath + editorAssets + "/AnimationFlowStyles.uss"))
            {
                var sdir = new System.IO.DirectoryInfo(Application.dataPath);
                var dirQueue = new Queue<System.IO.DirectoryInfo>();
                dirQueue.Enqueue(sdir);
                bool found = false;
                while (dirQueue.Count > 0)
                {
                    System.IO.DirectoryInfo dir = dirQueue.Dequeue();
                    if (System.IO.File.Exists(dir.FullName + "/AnimationFlowStyles.uss"))
                    {
                        string path = dir.FullName.Replace('\\', '/');
                        found = true;
                        path = path.Replace(projectPath, "");
                        if (path.StartsWith("/"))
                        {
                            path = path.Remove(0, 1);
                        }

                        editorAssets = path;
                        return true;
                    }

                    var dirs = dir.GetDirectories();
                    for (int i = 0; i < dirs.Length; i++)
                    {
                        dirQueue.Enqueue(dirs[i]);
                    }
                }

                if (!found)
                {
                    Debug.LogWarning("Could not locate editor assets folder. Make sure you have imported the package correctly.");
                    return false;
                }
            }

            return true;
        }
    }
}