* support an event triggered when a message appear

* WIP Quotes

src/events/message/messageCreate.ts

@@ -0,0 +1,64 @@
+import { GuildBasedChannel, Message } from 'discord.js';
+
+/** https://discord.js.org/#/docs/discord.js/main/class/Client?scrollTo=e-messageCreate */
+export default (message: Message) => {
+	// Ignore message if
+	if (
+		// Author is a bot
+		message.author.bot ||
+		// Author is Discord
+		message.author.system ||
+		// Message isn't a message
+		message.system ||
+		// Message is in PM (future-proof if we add Intents.FLAGS.DIRECT_MESSAGES)
+		!message.guild ||
+		// Guild is offline
+		!message.guild.available
+	) {
+		return;
+	}
+
+	/* Citation */
+	const regex = 'https://(?:canary\\.|ptb\\.)?discord(?:app)?\\.com/channels/(\\d{17,19})/(\\d{17,19})/(\\d{17,19})';
+	const urls = message.content.match(new RegExp(regex, 'g'));
+
+	// Ignore message if there is no URLs
+	if (!urls) {
+		return;
+	}
+
+	const messages = (
+		urls.reduce(
+			(data: {
+				message_id: string;
+				found_channel: GuildBasedChannel;
+			}[] = [], match) => {
+				const [,
+					guild_id,
+					channel_id,
+					message_id,
+				] = new RegExp(regex).exec(match) as RegExpExecArray;
+
+				// If message posted in another guild
+				if (guild_id !== message.guild?.id) {
+					return data;
+				}
+
+				const found_channel =
+					message.guild.channels.cache.get(channel_id);
+
+				// If channel doesn't exist in the guild
+				if (!found_channel) {
+					return data;
+				}
+
+				data.push({ message_id, found_channel });
+
+				return data;
+			},
+			[]
+		)
+	);
+
+	console.log(messages);
+};

src/utils/client.ts

@@ -45,6 +45,7 @@ export default async () => {
 	const client: Client = new Client({
 		intents: [
 			Intents.FLAGS.GUILDS,
+			Intents.FLAGS.GUILD_MESSAGES,
 		],
 	});