code optimizations and readme

Author: buggyzap

Readme.md

@@ -1 +1,51 @@
-# Open Saas Core
+# Override default php module Prestashop behaviours
+
+Are you searching for a method that let you override php modules behaviours of Prestashop?
+
+---
+
+## Module Download
+
+➡️ [Last release download](https://replaceme)
+
+---
+
+## What this module do
+
+This module let you override every module .php files you want in your shop.
+
+Native Prestashop override system, only let you override default .js and .tpl files via themes/modules sub-folders, or default Prestashop classes via override folder.
+
+Thats way I decided to create a module that let you to override .php files too!
+
+Sometimes you want to replace specific module behaviours and you don't want to touch original code, this module let you do exactly that!
+
+---
+
+## How it works
+
+1. Download and install last module release
+2. Create a module structure you need to override inside the *module_overrides* folder, following the schema (You will duplicate existing sample as starter point)
+
+```
+- module_name
+  - module_version
+    - .override
+    - file_to_override_2.php
+    - file_to_override_1.php
+    - src
+      - class_to_override.php
+```
+3. Go to module configuration page and switch from Active/Inactive override.
+
+<span style="color:#ff4444">.override</span> file is mandatory and contain the override state.
+
+The module automatically detect if is your first override and create *.original* file version that is used in case you want to reverse the changes.
+
+Note that you will see only overrides of modules you have installed of the specific version you want to override.
+
+---
+
+## Report a bug
+
+Please open an issue if you found a bug.

module_override.php

@@ -101,6 +101,15 @@ public function getContent()
         return $output;
     }
 
+    public function existOriginal($item)
+    {
+        return file_exists($item.".original");
+    }
+
+    public function createOriginal($item)
+    {
+        file_put_contents($item.".original", file_get_contents($item));
+    }
 
     protected function toggleOverride()
     {
@@ -125,6 +134,7 @@ protected function toggleOverride()
                     if(strpos($item, ".override") !== false) continue;
                     if($new_overriden){
                         if(strpos($item, ".original") !== false) continue;
+                        if(!$this->existOriginal($item)) $this->createOriginal($item);
                     }else{
                         if(strpos($item, ".original") === false) continue;
                         $sub_path = str_replace(".original", "", $sub_path);