Add Bulk Renamer Editor Utility

[zuedev]

Integrate a utility window script to allow bulk renaming (prepending or appending custom strings) of assets inside a selected folder. This speeds up asset management and organization workflows directly within the Unity Editor without breaking asset GUID connections.

Prototype

using UnityEngine;
using UnityEditor;
using System.IO;

public class BulkRenamer : EditorWindow
{
    private string customString = "";
    private bool isPrepend = true;

    [MenuItem("Tools/Bulk Renamer")]
    public static void ShowWindow()
    {
        GetWindow<BulkRenamer>("Bulk Renamer");
    }

    private void OnGUI()
    {
        GUILayout.Label("Bulk Rename Assets", EditorStyles.boldLabel);
        EditorGUILayout.Space();

        string selectedFolderPath = GetSelectedFolderPath();
        if (string.IsNullOrEmpty(selectedFolderPath))
        {
            EditorGUILayout.HelpBox("Please select a folder in your Project window.", MessageType.Warning);
        }
        else
        {
            EditorGUILayout.HelpBox($"Target Folder: {selectedFolderPath}", MessageType.Info);
        }

        EditorGUILayout.Space();
        customString = EditorGUILayout.TextField("Custom String", customString);

        string[] options = { "Prepend (Prefix)", "Append (Suffix)" };
        isPrepend = EditorGUILayout.Popup("Placement", isPrepend ? 0 : 1, options) == 0;

        EditorGUILayout.Space();

        EditorGUI.BeginDisabledGroup(string.IsNullOrEmpty(selectedFolderPath) || string.IsNullOrEmpty(customString));
        if (GUILayout.Button("Rename Assets Inside Folder"))
        {
            RenameAssets(selectedFolderPath);
        }
        EditorGUI.EndDisabledGroup();
    }

    private string GetSelectedFolderPath()
    {
        var selectedObject = Selection.activeObject;
        if (selectedObject == null) return null;

        string path = AssetDatabase.GetAssetPath(selectedObject);
        if (AssetDatabase.IsValidFolder(path))
        {
            return path;
        }

        return null;
    }

    private void RenameAssets(string folderPath)
    {
        string[] guids = AssetDatabase.FindAssets("", new[] { folderPath });
        int renamedCount = 0;

        AssetDatabase.StartAssetEditing();

        try
        {
            foreach (string guid in guids)
            {
                string assetPath = AssetDatabase.GUIDToAssetPath(guid);

                if (AssetDatabase.IsValidFolder(assetPath))
                    continue;

                string parentFolder = Path.GetDirectoryName(assetPath).Replace('\\', '/');
                if (parentFolder != folderPath)
                    continue;

                string filename = Path.GetFileNameWithoutExtension(assetPath);
                string newName = isPrepend ? customString + filename : filename + customString;

                string error = AssetDatabase.RenameAsset(assetPath, newName);
                if (string.IsNullOrEmpty(error))
                {
                    renamedCount++;
                }
                else
                {
                    Debug.LogError($"Failed to rename {filename}: {error}");
                }
            }
        }
        finally
        {
            AssetDatabase.StopAssetEditing();
        }

        AssetDatabase.Refresh();
        EditorUtility.DisplayDialog("Success", $"Successfully renamed {renamedCount} assets.", "OK");
    }
}