(buttons): Hook up buttons. Pre-testing.

src/buttons/notePrevious.ts

@@ -0,0 +1,18 @@
+import { ButtonInteraction, Client } from 'discord.js';
+import { Button } from '../types';
+import { getNoteMessage } from '../utils';
+
+class NotePreviousButton implements Button<Client> {
+  id = 'note-previous';
+
+  async execute(context: Client<boolean>, interaction: ButtonInteraction, userId: string, page: string): Promise<void> {
+    await interaction.deferUpdate();
+
+    const message = await getNoteMessage(userId, parseInt(page) - 1);
+    if (!message) return;
+
+    await interaction.editReply(message);
+  }
+}
+
+export default new NotePreviousButton();