feat: load news and calendars from cache on startup

Also check calendars for cache before trying to load

src/services/calendar.ts

@@ -134,6 +134,7 @@ export default class Calendar extends GObject.Object {
                 icalStr = cal.value;
             } else {
                 console.error(`Failed to get calendar from ${config.webcals.get()[i]}:\n${cal.reason}`);
+                if (GLib.file_test(`${this.#cacheDir}/${webcal}`, GLib.FileTest.EXISTS))
                     icalStr = await readFileAsync(`${this.#cacheDir}/${webcal}`);
             }
 
@@ -202,6 +203,23 @@ export default class Calendar extends GObject.Object {
 
         GLib.mkdir_with_parents(this.#cacheDir, 0o755);
 
+        const cals = config.webcals.get().map(async c => {
+            const webcal = pathToFileName(c);
+
+            if (GLib.file_test(`${this.#cacheDir}/${webcal}`, GLib.FileTest.EXISTS)) {
+                const data = await readFileAsync(`${this.#cacheDir}/${webcal}`);
+                const comp = new ical.Component(ical.parse(data));
+                const name = (comp.getFirstPropertyValue("x-wr-calname") ?? `Calendar ${this.#calCount++}`) as string;
+                this.#calendars[name] = comp;
+            }
+        });
+        Promise.allSettled(cals).then(() => {
+            this.#cachedEvents = {};
+            this.#cachedMonths.clear();
+            this.notify("calendars");
+            this.updateUpcoming();
+        });
+
         this.updateCalendars().catch(console.error);
         config.webcals.subscribe(() => this.updateCalendars().catch(console.error));
         config.upcomingDays.subscribe(() => this.updateUpcoming());

src/services/news.ts

@@ -106,6 +106,13 @@ export default class News extends GObject.Object {
         }
         this.notify("articles");
 
+        this.updateCategories();
+
+        this.#loading = false;
+        this.notify("loading");
+    }
+
+    updateCategories() {
         this.#categories = {};
         for (const article of this.#articles) {
             for (const category of article.category) {
@@ -114,14 +121,20 @@ export default class News extends GObject.Object {
             }
         }
         this.notify("categories");
-
-        this.#loading = false;
-        this.notify("loading");
     }
 
     constructor() {
         super();
 
+        if (GLib.file_test(this.#cachePath, GLib.FileTest.EXISTS))
+            readFileAsync(this.#cachePath)
+                .then(data => {
+                    this.#articles = JSON.parse(data);
+                    this.notify("articles");
+                    this.updateCategories();
+                })
+                .catch(console.error);
+
         this.getNews().catch(console.error);
         config.apiKey.subscribe(() => this.getNews().catch(console.error));
         config.countries.subscribe(() => this.getNews().catch(console.error));