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Diffstat (limited to 'packages/demobank-ui/src/hooks/settings.ts')
-rw-r--r-- | packages/demobank-ui/src/hooks/settings.ts | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/packages/demobank-ui/src/hooks/settings.ts b/packages/demobank-ui/src/hooks/settings.ts new file mode 100644 index 000000000..5115f9959 --- /dev/null +++ b/packages/demobank-ui/src/hooks/settings.ts @@ -0,0 +1,49 @@ +/* + This file is part of GNU Taler + (C) 2022 Taler Systems S.A. + + GNU Taler is free software; you can redistribute it and/or modify it under the + terms of the GNU General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + GNU Taler 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 General Public License for more details. + + You should have received a copy of the GNU General Public License along with + GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/> + */ + +import { useLocalStorage } from "@gnu-taler/web-util/lib/index.browser"; + +interface Settings { + currentWithdrawalOperationId: string | undefined; +} + +const defaultSettings: Settings = { + currentWithdrawalOperationId: undefined, +}; + +function parse_json_or_undefined<T>(str: string | undefined): T | undefined { + if (str === undefined) return undefined; + try { + return JSON.parse(str); + } catch { + return undefined; + } +} + +export function useSettings(): [ + Readonly<Settings>, + <T extends keyof Settings>(key: T, value: Settings[T]) => void, +] { + const { value, update } = useLocalStorage("demobank-settings"); + + const parsed: Settings = parse_json_or_undefined(value) ?? defaultSettings; + function updateField<T extends keyof Settings>(k: T, v: Settings[T]) { + const newValue = { ...parsed, [k]: v }; + const json = JSON.stringify(newValue); + update(json); + } + return [parsed, updateField]; +} |