Simple class generator for Unity

TemplateGenerator.cs

using UnityEditor;
using UnityEngine;
using System.IO;

namespace MPF.Editor
{
    public class TemplateGenerator: EditorWindow
    {
        readonly string GeneralTemplate =
            "using System.Collections;" + System.Environment.NewLine +
            "using System.Collections.Generic;" + System.Environment.NewLine +
            "using UnityEngine;" + System.Environment.NewLine + System.Environment.NewLine +
            "namespace {0}" + System.Environment.NewLine +
            "{{" + System.Environment.NewLine +
            "    public class {1}" + System.Environment.NewLine +
            "    {{" + System.Environment.NewLine +
            "    }}" + System.Environment.NewLine +
            "}}";

        string namespaceName = "MPFTemplate";
        string className = "MPFClass";

        [MenuItem("MPF/Template")]
        public static void CreateGeneralTemplate()
        {
            EditorWindow.GetWindow<TemplateGenerator>("Template");
        }

        void OnGUI()
        {
            namespaceName = EditorGUILayout.TextField("Namespace", namespaceName);
            className = EditorGUILayout.TextField("Class", className);

            if (GUILayout.Button("Generate"))
            {
                string path = FileManager.FormatPath(Path.Combine(Application.dataPath, className + ".cs"));
                Debug.Log("Generate file: " + path);

                if(File.Exists(path))
                {
                    EditorUtility.DisplayDialog("Error", "File already exists." + System.Environment.NewLine + path, "OK");
                    return;
                }

                if (string.IsNullOrEmpty(namespaceName))
                {
                    EditorUtility.DisplayDialog("Error", "Namespace is empty.", "OK");
                    return;
                }

                if (string.IsNullOrEmpty(className))
                {
                    EditorUtility.DisplayDialog("Error", "Class name is empty.", "OK");
                    return;
                }

                var fs = File.Create(path);
                var sw = new StreamWriter(fs);
                sw.Write(string.Format(GeneralTemplate, namespaceName, className));
                sw.Close();
                fs.Close();

                AssetDatabase.SaveAssets();
                AssetDatabase.Refresh();
            }
        }
    }
}