feat: pull from hackernews

src/index.ts

@@ -9,6 +9,7 @@ import { scheduleJob } from "node-schedule";
 import { handleMessageCreate } from "./events/handleMessageCreate.js";
 import {
   postFreeCodeCampNews,
+  postHackerNews,
 } from "./modules/postNews.js";
 import { respondToDm } from "./modules/respondToDm.js";
 import { instantiateServer } from "./server/serve.js";
@@ -26,6 +27,7 @@ const amari: Amari = {
   partials: [ Partials.Channel ] }),
   lastRssItems: {
     freeCodeCamp: null,
+    hackerNews:   null,
   },
 };
 
@@ -34,6 +36,7 @@ amari.discord.once(Events.ClientReady, () => {
     `Authenticated to Discord as ${amari.discord.user?.username ?? "unknown"}`);
   scheduleJob("post news", "0 * * * *", async() => {
     await postFreeCodeCampNews(amari);
+    await postHackerNews(amari);
   });
 });
 

src/interfaces/amari.ts

@@ -10,5 +10,6 @@ export interface Amari {
   discord:      Client;
   lastRssItems: {
     freeCodeCamp: string | null;
+    hackerNews:   string | null;
   };
 }

src/interfaces/rss.ts

@@ -37,4 +37,29 @@ interface FreeCodeCampRSS {
   ttl:           string;
 }
 
-export type { FreeCodeCampRSS };
+interface HackerNewsRSS {
+  items: Array<{
+    "creator":        string;
+    "title":          string;
+    "link":           string;
+    "pubDate":        string;
+    "dc:creator":     string;
+    "comments":       string;
+    "content":        string;
+    "contentSnippet": string;
+    "guid":           string;
+    "isoDate":        string;
+  }>;
+  feedUrl:         string;
+  paginationLinks: {
+    self: string;
+  };
+  title:         string;
+  description:   string;
+  generator:     string;
+  link:          string;
+  lastBuildDate: string;
+  docs:          string;
+}
+
+export type { FreeCodeCampRSS, HackerNewsRSS };

src/modules/postNews.ts

@@ -10,7 +10,10 @@ import Parser from "rss-parser";
 import { ids } from "../config/ids.js";
 import { logger } from "../utils/logger.js";
 import type { Amari } from "../interfaces/amari.js";
-import type { FreeCodeCampRSS } from "../interfaces/rss.js";
+import type {
+  FreeCodeCampRSS,
+  HackerNewsRSS,
+} from "../interfaces/rss.js";
 
 /**
  * Fetches the RSS feed from freeCodeCamp News and posts the latest updates.
@@ -54,4 +57,46 @@ const postFreeCodeCampNews = async(amari: Amari): Promise<void> => {
   }
 };
 
-export { postFreeCodeCampNews };
+/**
+ * Fetches the RSS feed from HackerNews and posts the latest updates.
+ * @param amari - Amari's instance.
+ */
+const postHackerNews = async(amari: Amari): Promise<void> => {
+  try {
+    const parser = new Parser<HackerNewsRSS, HackerNewsRSS["items"]>();
+    const { items }
+      = await parser.parseURL("https://hnrss.org/newest?link=comments");
+    if (amari.lastRssItems.hackerNews === null) {
+      amari.lastRssItems.hackerNews = items[0]?.guid ?? null;
+      return;
+    }
+    const lastIndex = items.findIndex((item) => {
+      return item.guid === amari.lastRssItems.hackerNews;
+    });
+    const latestPosts
+      = lastIndex > -1
+        ? items.slice(0, Math.min(lastIndex, 5))
+        : items.slice(0, 5);
+    const channel
+      = amari.discord.channels.cache.get(ids.channels.news)
+      ?? await amari.discord.channels.fetch(ids.channels.news);
+    if (channel === null) {
+      throw new Error("Cannot find news channel.");
+    }
+    if (!channel.isSendable()) {
+      throw new Error("News channel is not sendable.");
+    }
+    await Promise.all(latestPosts.map(async(post) => {
+      const sent = await channel.send(post.link);
+      if (channel.type === ChannelType.GuildAnnouncement) {
+        await sent.crosspost();
+      }
+    }));
+  } catch (error) {
+    if (error instanceof Error) {
+      await logger.error("post hackernews module", error);
+    }
+  }
+};
+
+export { postFreeCodeCampNews, postHackerNews };