replace old client with new client from commafeed-ui repository

commafeed-client/src/app/utils.ts

@@ -0,0 +1,21 @@
+import { Category } from "./types"
+
+export function visitCategoryTree(category: Category, visitor: (category: Category) => void): void {
+    visitor(category)
+    category.children.forEach(child => visitCategoryTree(child, visitor))
+}
+
+export function flattenCategoryTree(category: Category): Category[] {
+    const categories: Category[] = []
+    visitCategoryTree(category, c => categories.push(c))
+    return categories
+}
+
+export function categoryUnreadCount(category?: Category): number {
+    if (!category) return 0
+
+    return flattenCategoryTree(category)
+        .flatMap(c => c.feeds)
+        .map(f => f.unread)
+        .reduce((total, current) => total + current, 0)
+}