1 files changed, 80 insertions, 0 deletions
diff --git a/packages/anastasis-webui/src/hooks/useLocalStorage.ts b/packages/anastasis-webui/src/hooks/useLocalStorage.ts
new file mode 100644
index 000000000..ed5b491f2
--- /dev/null
+++ b/packages/anastasis-webui/src/hooks/useLocalStorage.ts
@@ -0,0 +1,80 @@
+/*
+ This file is part of GNU Anastasis
+ (C) 2021-2022 Anastasis SARL
+
+ GNU Anastasis is free software; you can redistribute it and/or modify it under the
+ terms of the GNU Affero General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License along with
+ GNU Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ *
+ * @author Sebastian Javier Marchano (sebasjm)
+ */
+
+import { StateUpdater, useState } from "preact/hooks";
+
+export function useLocalStorage(
+  key: string,
+  initialValue?: string,
+): [string | undefined, StateUpdater<string | undefined>] {
+  const [storedValue, setStoredValue] = useState<string | undefined>(
+    (): string | undefined => {
+      return typeof window !== "undefined"
+        ? window.localStorage.getItem(key) || initialValue
+        : initialValue;
+    },
+  );
+
+  const setValue = (
+    value?: string | ((val?: string) => string | undefined),
+  ): void => {
+    setStoredValue((p) => {
+      const toStore = value instanceof Function ? value(p) : value;
+      if (typeof window !== "undefined") {
+        if (!toStore) {
+          window.localStorage.removeItem(key);
+        } else {
+          window.localStorage.setItem(key, toStore);
+        }
+      }
+      return toStore;
+    });
+  };
+
+  return [storedValue, setValue];
+}
+
+//TODO: merge with the above function
+export function useNotNullLocalStorage(
+  key: string,
+  initialValue: string,
+): [string, StateUpdater<string>, boolean] {
+  const [storedValue, setStoredValue] = useState<string>((): string => {
+    return typeof window !== "undefined"
+      ? window.localStorage.getItem(key) || initialValue
+      : initialValue;
+  });
+
+  const setValue = (value: string | ((val: string) => string)): void => {
+    const valueToStore = value instanceof Function ? value(storedValue) : value;
+    setStoredValue(valueToStore);
+    if (typeof window !== "undefined") {
+      if (!valueToStore) {
+        window.localStorage.removeItem(key);
+      } else {
+        window.localStorage.setItem(key, valueToStore);
+      }
+    }
+  };
+
+  const isSaved = window.localStorage.getItem(key) !== null;
+  return [storedValue, setValue, isSaved];
+}