80 lines
2.2 KiB
TypeScript
80 lines
2.2 KiB
TypeScript
// Copyright: Ankitects Pty Ltd and contributors
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// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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import { Writable, writable, get } from "svelte/store";
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export interface CustomStore<T> extends Writable<T> {
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subscribe: (getter: (value: T) => void) => () => void;
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set: (value: T) => void;
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}
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export type PreferenceStore<T> = {
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[K in keyof Omit<T, "toJSON">]: CustomStore<T[K]>;
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};
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export type PreferencePayload<T> = {
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[K in keyof Omit<T, "toJSON">]: T[K];
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};
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export type PreferenceRaw<T> = {
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[K in keyof T]: T[K];
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};
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function createPreference<T>(
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initialValue: T,
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savePreferences: () => void,
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): CustomStore<T> {
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const { subscribe, set, update } = writable(initialValue);
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return {
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subscribe,
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set: (value: T): void => {
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set(value);
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savePreferences();
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},
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update: (updater: (value: T) => T): void => {
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update(updater);
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savePreferences();
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},
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};
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}
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function preparePreferences<T>(
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Preferences: T,
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setter: (payload: PreferencePayload<T>) => Promise<void>,
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toObject: (preferences: T, options: { defaults: boolean }) => PreferenceRaw<T>,
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): PreferenceStore<T> {
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const preferences: Partial<PreferenceStore<T>> = {};
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function constructPreferences(): PreferencePayload<T> {
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const payload: Partial<PreferencePayload<T>> = {};
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for (const key in preferences as PreferenceStore<T>) {
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payload[key] = get(preferences[key]);
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}
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return payload as PreferencePayload<T>;
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}
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function savePreferences(): void {
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setter(constructPreferences());
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}
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for (const [key, value] of Object.entries(
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toObject(Preferences, { defaults: true }),
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)) {
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preferences[key] = createPreference(value, savePreferences);
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}
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return preferences as PreferenceStore<T>;
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}
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export async function getPreferences<T>(
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getter: () => Promise<T>,
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setter: (payload: PreferencePayload<T>) => Promise<void>,
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toObject: (preferences: T, options: { defaults: boolean }) => PreferenceRaw<T>,
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): Promise<PreferenceStore<T>> {
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const initialPreferences = await getter();
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return preparePreferences(initialPreferences, setter, toObject);
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}
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