[1.2] Migration mechanism put in place

backgroundScripts/background.js

@@ -1,4 +1,5 @@
-var categories = [{
+var defaults = {
+    defaultCategories: [{
         name: "tv_show",
         season: true,
         urls: ["/filmvid%C3%A9o/s%C3%A9rie-tv/", "/filmvideo/serie-tv/"],
@@ -15,15 +16,41 @@ var categories = [{
             "/filmvid%C3%A9o/animation/",
             "/filmvideo/animation/"
         ],
+    }],
     },
 ];
+    storageSchema: 1 // Increment this when data format changes
+};
 
 chrome.runtime.onInstalled.addListener(function(details){
+    if(details.reason === "install"){
+        chrome.storage.sync.set(defaults);
+        chrome.storage.sync.set({ 'categories': defaults.defaultCategories});
+    } else if(details.reason === "update"){
+        migrateData();
+    }
+});
+
+function migrateData() {
     if(details.reason == "install"){
         chrome.storage.sync.set({ 'defaultCategories': categories});
         chrome.storage.sync.set({ 'categories': categories});
+    // This pulls stored values, falling back to defaults, if none
+    chrome.storage.sync.get(defaults, function (data) {
+        var migrated = false;
+        while (!migrated) {
+            switch (data.storageSchema) {
+                // case 1:
+                //     /* modify data to migrate from 1.0-1.2 to 1.3 */
+                //     data.storageSchema = 2;
+                //     break;
+                case defaults.storageSchema: // Expected; we're done migrating
+                    migrated = true;
+                    break;
+                default:
+                    throw new Error(`Unrecognized storage schema ${data.storageSchema}!`);
+            }
     }
-    if(details.reason == "update"){
+        chrome.storage.sync.set(defaults);
-        chrome.storage.sync.set({ 'defaultCategories': categories});
-    }
 });
+}

manifest.json

@@ -1,6 +1,6 @@
 {
     "name": "BetterYGG",
-    "version": "1.1",
+    "version": "1.2",
     "description": "Téléchargez des torrents sur YGG sans ètre connecté et autres !!!",
     "icons": {
       "16": "img/flexgg16.png",