Autosave

using UnityEditor;
#if UNITY_5_3_OR_NEWER
using UnityEditor.SceneManagement;
#endif
using UnityEngine;

internal class AutosaveUnity {

    private static bool autosaveEnabled {
        get { return EditorPrefs.GetBool("Autosave", true); }
        set { EditorPrefs.SetBool("Autosave", value); }
    }

    [MenuItem("Edit/Autosave", false, -10000000)]
    private static void AutosaveMenu() {
        autosaveEnabled = !autosaveEnabled;
        Menu.SetChecked("Edit/Autosave", autosaveEnabled);
    }

    [MenuItem("Edit/Autosave", true, -10000000)]
    private static bool MenuCheck() {
        Menu.SetChecked("Edit/Autosave", autosaveEnabled);
        return true;
    }

    [InitializeOnLoadMethod]
    private static void Init() {
        EditorApplication.playmodeStateChanged += () => {
            if(EditorApplication.isPlayingOrWillChangePlaymode && !EditorApplication.isPlaying) {
                if(autosaveEnabled) {
                    Debug.Log("Auto-Saving project");

#if UNITY_5_3_OR_NEWER
                    EditorSceneManager.SaveOpenScenes();
#else
                    EditorApplication.SaveScene();
#endif
                    AssetDatabase.SaveAssets();
                }
            }
        };
    }
}