Untitled

using UnityEngine;
using UnityEditor;
using System.IO;
using System;

public class BuildGame : MonoBehaviour {

    public static string appName = "msd";

    [MenuItem("Build/Build All")]
    public static void BuildAll() {
        BuildWindows();
        BuildOSX();
        BuildLinux();
    }

    [MenuItem("Build/Build Windows")]
    public static void BuildWindows() {
        MakeBuild(BuildTarget.StandaloneWindows, "win", "exe");
    }

    [MenuItem("Build/Build OSX")]
    public static void BuildOSX() {
        MakeBuild(BuildTarget.StandaloneOSX, "osx", "app");
    }

    [MenuItem("Build/Build Linux")]
    public static void BuildLinux() {
        MakeBuild(BuildTarget.StandaloneLinux, "linux", "x86");
    }

    public static void MakeBuild(BuildTarget target, string platform, string extension) {
        FileUtil.DeleteFileOrDirectory("Builds/"+platform);
        BuildPlayerOptions bpo = new BuildPlayerOptions();
        bpo.locationPathName = "Builds/"+platform+"/"+appName+"."+extension;
        bpo.target = target;
        BuildPipeline.BuildPlayer(bpo);

        FileUtil.DeleteFileOrDirectory("Builds/"+platform+"/extrafile.txt");
        FileUtil.CopyFileOrDirectory(appName+".wad", "Builds/"+platform+"/extrafile.txt");
    }
}