show categories in unread as tree

src/categories.js

@@ -292,7 +292,7 @@ var privileges = require('./privileges');
 
 		for (i; i < len; ++i) {
 			category = categories[i];
-			if (!category.hasOwnProperty('parentCid')) {
+			if (!category.hasOwnProperty('parentCid') || category.parentCid === null) {
 				category.parentCid = 0;
 			}
 

src/controllers/unread.js

@@ -100,12 +100,13 @@ function getWatchedCategories(uid, selectedCid, callback) {
 			privileges.categories.filterCids('read', cids, uid, next);
 		},
 		function (cids, next) {
-			categories.getCategoriesFields(cids, ['cid', 'name', 'slug', 'icon', 'link', 'color', 'bgColor'], next);
+			categories.getCategoriesFields(cids, ['cid', 'name', 'slug', 'icon', 'link', 'color', 'bgColor', 'parentCid'], next);
 		},
 		function (categoryData, next) {
 			categoryData = categoryData.filter(function(category) {
 				return category && !category.link;
 			});
+
 			var selectedCategory;
 			categoryData.forEach(function(category) {
 				category.selected = parseInt(category.cid, 10) === parseInt(selectedCid, 10);
@@ -113,11 +114,27 @@ function getWatchedCategories(uid, selectedCid, callback) {
 					selectedCategory = category;
 				}
 			});
-			next(null, {categories: categoryData, selectedCategory: selectedCategory});
+
+			var categoriesData = [];
+			var tree = categories.getTree(categoryData, 0);
+
+			tree.forEach(function(category) {
+				recursive(category, categoriesData, '');
+			});
+
+			next(null, {categories: categoriesData, selectedCategory: selectedCategory});
 		}
 	], callback);
 }
 
+function recursive(category, categoriesData, level) {
+	category.level = level;
+	categoriesData.push(category);
+
+	category.children.forEach(function(child) {
+		recursive(child, categoriesData, '    ' + level);
+	});
+}
 
 unreadController.unreadTotal = function(req, res, next) {
 	var filter = req.params.filter || '';