command to get message ids from bot's dms

structure/commands/MessageIds.js

@@ -0,0 +1,54 @@
+const { MessageAttachment } = require('discord.js');
+const Command = require('../Command');
+
+class MessageIds extends Command {
+
+    constructor (client) {
+        super(client, {
+            name: 'messageids',
+            aliases: [ 'msgids', 'mmids' ]
+        });
+    }
+
+    async execute (message, { args }) {
+
+        let channel = null;
+        if (args?.length) channel = await this.client.resolveChannel(args[0]);
+        else ({ channel } = message);
+
+        const result = this.client.getUserFromChannel(channel);
+        if (result.error) return result;
+        const [ userId ] = result;
+        
+        const user = await this.client.users.fetch(userId);
+
+        const history = await this.client.cache.loadModmailHistory(userId);
+        const sorted = history.sort((a, b) => b.timestamp - a.timestamp);
+        const idContentPairs = [];
+
+        for (const mm of sorted) {
+            if (!mm.msgid && !mm.isReply) break; // Old modmails from before msg id logging -- could probably supplement with fetching messages but cba rn
+            idContentPairs.push(`${mm.msgid} - ${mm.content}`);
+
+        }
+
+        if (!idContentPairs.length) {
+            const msgs = await user.createDM().then(dm => dm.messages.fetch());
+            const sortedMsgs = msgs.filter(msg => msg.author.id !== this.client.user.id).sort((a, b) => b.createdTimestamp - a.createdTimestamp);
+            for (const msg of sortedMsgs.values()) idContentPairs.push(`${msg.id} - ${msg.content}`);
+        }
+
+        await message.channel.send({
+            files: [
+                new MessageAttachment(
+                    Buffer.from(`ID - Content pairs for\n${user.tag} - ${user.id}\n\n${idContentPairs.join('\n')}`),
+                    'ids.txt'
+                )
+            ]
+        });
+
+    }
+
+}
+
+module.exports = MessageIds;