Implement Unread Filter for Library (#54)

src/util/useLibraryOptions.ts

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { BooleanParam, useQueryParams } from 'use-query-params';
+
+export type NullAndUndefined<T> = T | null | undefined;
+
+interface IUseLibraryOptions {
+    unread: NullAndUndefined<boolean>
+    setUnread: (unread: NullAndUndefined<boolean>) => void
+    active: boolean
+}
+
+export default function useLibraryOptions(): IUseLibraryOptions {
+    const [query, setQuery] = useQueryParams({
+        unread: BooleanParam,
+    });
+    const { unread } = query;
+    const setUnread = (newUnread: NullAndUndefined<boolean>) => {
+        setQuery(Object.assign(query, { unread: newUnread }), 'replace');
+    };
+    // eslint-disable-next-line eqeqeq
+    const active = !(unread == undefined);
+    return {
+        unread, setUnread, active,
+    };
+}