修改Unity中Lua文件的默认打开程序

using UnityEngine;
using UnityEditor;
using System;

public class LuaTxtEditor
{

    //http://www.xuanyusong.com/archives/3702 

    [UnityEditor.Callbacks.OnOpenAssetAttribute(1)]
    public static bool step1(int instanceID, int line)
    {
        //string name = EditorUtility.InstanceIDToObject(instanceID).name;
        //Debug.Log("Open Asset step: 1 (" + name + ")");

        return false;
    }

    [UnityEditor.Callbacks.OnOpenAssetAttribute(2)]
    public static bool step2(int instanceID, int line)
    {
        string strFilePath = AssetDatabase.GetAssetPath(EditorUtility.InstanceIDToObject(instanceID));
        string strFileName = Application.dataPath + "/" + strFilePath.Replace("Assets/", "");

        if (strFileName.EndsWith(".txt"))
        {
            string strZBStudioPath = Environment.GetEnvironmentVariable("ZEROBRANESTUDIO_PATH");

            if (strZBStudioPath != null && strZBStudioPath.Length > 0)
            {
                System.Diagnostics.Process process = new System.Diagnostics.Process();
                System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
                startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
                startInfo.FileName = strZBStudioPath + (strZBStudioPath.EndsWith("/") ? "" : "/") +  "zbstudio.exe";
                startInfo.Arguments = strFileName;
                process.StartInfo = startInfo;
                process.Start();

                //Debug.Log(startInfo.FileName + " \t " + startInfo.Arguments);

                return true;
            }
            else
            {
                Debug.Log("Not Found Enviroment Variable 'ZEROBRANESTUDIO_PATH'.");

                return false;
            }            
        }

        //string name = EditorUtility.InstanceIDToObject(instanceID).name;
        //Debug.Log("Open Asset step: 1 (" + name + ")");

        return false;
    }

}