Make a get_category utility

Author: jeremy-rifkin

src/bot-utilities.ts

@@ -242,4 +242,13 @@ export class BotUtilities {
         assert(channel instanceof Discord.ThreadChannel, `Channel ${channel} (${id}) not of the expected type`);
         return channel;
     }
+
+    async get_category(id: string) {
+        const category = await this.wheatley.client.channels.fetch(id);
+        if (!category) {
+            throw Error(`Category ${id} not found`);
+        }
+        assert(category instanceof Discord.CategoryChannel, `Category ${category} (${id}) not of the expected type`);
+        return category;
+    }
 }

src/modules/tccpp/components/permissions-manager.ts

@@ -391,13 +391,7 @@ export default class PermissionManager extends BotComponent {
     async sync_permissions() {
         await Promise.all(
             Object.entries(this.category_permissions).map(async ([id, permissions]) => {
-                const category = await this.wheatley.client.channels.fetch(id);
-                if (!category) {
-                    throw Error(`Category ${id} not found`);
-                }
-                if (!(category instanceof Discord.CategoryChannel)) {
-                    throw Error(`Category ${id} not of the expected type`);
-                }
+                const category = await this.utilities.get_category(id);
                 await this.sync_category_permissions(category, permissions);
             }),
         );