improves handling of user data

src/lib/user/progress.ts

@@ -0,0 +1,27 @@
+import { episode_audio, episode_progress } from '$lib/audio';
+import type { UserProgress } from '$lib/types';
+import { get_pathname_from_url } from '$lib/utility/get-pathname-from-url';
+import { info } from '$lib/utility/package/log';
+import { persisted } from 'svelte-local-storage-store';
+import { get } from 'svelte/store';
+
+const _default_user_progress = {} satisfies UserProgress;
+const _user_progress = persisted<UserProgress>('USER_PROGRESS', _default_user_progress);
+
+const save = () => {
+	const audio = get(episode_audio);
+	if (!audio?.src) return;
+
+	info('saving progress: ', audio.src);
+
+	const pathname = get_pathname_from_url(audio.src);
+	const current_time = get(episode_progress).current_time;
+	_user_progress.update((prev) => ({ ...prev, [pathname]: current_time }));
+};
+
+export const user_progress = {
+	subscribe: _user_progress.subscribe,
+	get: (src: string) => get(_user_progress)[get_pathname_from_url(src)],
+	save,
+	clear: () => _user_progress.set(_default_user_progress),
+};