Added more functionality to the react command

src/commands/utilities/react.ts

@@ -1,18 +1,72 @@
 import Command from "../../core/command";
 import {CommonLibrary} from "../../core/lib";
+import {Message, Channel, TextChannel} from "discord.js";
 
 export default new Command({
     description:
         "Reacts to the a previous message in your place. You have to react with the same emote before the bot removes that reaction.",
-    usage: "react <emote name> (<message ID / distance>)",
+    usage: 'react <emotes...> (<distance / message ID / "Copy ID" / "Copy Message Link">)',
     async run($: CommonLibrary): Promise<any> {
-        let target;
+        let target: Message | undefined;
         let distance = 1;
 
         if ($.args.length >= 2) {
-            const last = $.args[$.args.length - 1];
+            const last = $.args[$.args.length - 1]; // Because this is optional, do not .pop() unless you're sure it's a message link indicator.
+            const URLPattern = /^(?:https:\/\/discord.com\/channels\/(\d{17,19})\/(\d{17,19})\/(\d{17,19}))$/;
+            const copyIDPattern = /^(?:(\d{17,19})-(\d{17,19}))$/;
 
-            if (/\d{17,19}/g.test(last)) {
+            // https://discord.com/channels/<Guild ID>/<Channel ID>/<Message ID> ("Copy Message Link" Button)
+            if (URLPattern.test(last)) {
+                const match = URLPattern.exec(last)!;
+                const guildID = match[1];
+                const channelID = match[2];
+                const messageID = match[3];
+                let guild = $.guild;
+                let channel: Channel | undefined = $.channel;
+
+                if (guild?.id !== guildID) {
+                    try {
+                        guild = await $.client.guilds.fetch(guildID);
+                    } catch {
+                        return $.channel.send(`\`${guildID}\` is an invalid guild ID!`);
+                    }
+                }
+
+                if (channel.id !== channelID) channel = guild.channels.cache.get(channelID);
+                if (!channel) return $.channel.send(`\`${channelID}\` is an invalid channel ID!`);
+
+                if ($.message.id !== messageID) {
+                    try {
+                        target = await (channel as TextChannel).messages.fetch(messageID);
+                    } catch {
+                        return $.channel.send(`\`${messageID}\` is an invalid message ID!`);
+                    }
+                }
+
+                $.args.pop();
+            }
+            // <Channel ID>-<Message ID> ("Copy ID" Button)
+            else if (copyIDPattern.test(last)) {
+                const match = copyIDPattern.exec(last)!;
+                const channelID = match[1];
+                const messageID = match[2];
+                let channel: Channel | undefined = $.channel;
+
+                if (channel.id !== channelID) channel = $.guild?.channels.cache.get(channelID);
+                if (!channel) return $.channel.send(`\`${channelID}\` is an invalid channel ID!`);
+
+                if ($.message.id !== messageID) {
+                    try {
+                        target = await (channel as TextChannel).messages.fetch(messageID);
+                    } catch {
+                        return $.channel.send(`\`${messageID}\` is an invalid message ID!`);
+                    }
+                }
+
+                $.args.pop();
+            }
+            // <Message ID>
+            else if (/^\d{17,19}$/.test(last)) {
                 try {
                     target = await $.channel.messages.fetch(last);
                 } catch {
@@ -22,7 +76,7 @@ export default new Command({
                 $.args.pop();
             }
             // The entire string has to be a number for this to match. Prevents leaCheeseAmerican1 from triggering this.
-            else if (/^\d+$/g.test(last)) {
+            else if (/^\d+$/.test(last)) {
                 distance = parseInt(last);
 
                 if (distance >= 0 && distance <= 99) $.args.pop();