Issue 2192 - Added notification opt-out mechanism (Core)

lib/notification.js

Index: lib/notification.js
===================================================================
--- a/lib/notification.js
+++ b/lib/notification.js
@@ -191,9 +191,12 @@
     let notificationToShow = null;
     for (let notification of notifications)
     {
-      if ((typeof notification.type === "undefined" || notification.type !== "critical")
-          && Prefs.notificationdata.shown.indexOf(notification.id) !== -1)
-        continue;
+      if (typeof notification.type === "undefined" || notification.type !== "critical")
+      {
+        if (Prefs.notificationdata.shown.indexOf(notification.id) !== -1
+            || Prefs.notifications_ignoredcategories.indexOf("*") !== -1)
+          continue;
+      }
 
       if (typeof url === "string" || notification.urlFilters instanceof Array)
       {
@@ -332,6 +335,27 @@
     let questionListeners = listeners[id];
     for (let listener of questionListeners)
       listener(approved);
+  },
+  
+  /**
+   * Toggles whether notifications of a specific category should be ignored
+   * @param {String} category notification category identifier
+   * @param {Boolean} [forceValue] force specified value
+   */
+  toggleIgnoreCategory: function(category, forceValue)
+  {
+    let categories = Prefs.notifications_ignoredcategories;
+    let index = categories.indexOf(category);
+    if (index == -1 && forceValue !== false)
+    {
+      categories.push(category);
+      Prefs.notifications_showui = true;
+    }
+    else if (index != -1 && forceValue !== true)
+      categories.splice(index, 1);
+
+    // HACK: JSON values aren't saved unless they are assigned a different object.
+    Prefs.notifications_ignoredcategories = JSON.parse(JSON.stringify(categories));
   }
 };
 Notification.init();