finished sending messages guide

packages/docs/src/guides/sending-messages.md

@@ -71,8 +71,96 @@ const reacord = new ReacordDiscordJs(client, {
 
 ## Discord Slash Commands
 
-<aside class="opacity-75 italic border-l-4 pl-3 border-white/50">
+<aside>
 This section also applies to other kinds of application commands, such as context menu commands.
 </aside>
 
-todo
+To reply to a command interaction, use the `.reply()` function. This function returns an instance that works the same way as the one from `.send()`. Here's an example:
+
+```jsx
+import { Client } from "discord.js"
+import * as React from "react"
+import { Button, ReacordDiscordJs } from "reacord"
+
+const client = new Client({ intents: [] })
+const reacord = new ReacordDiscordJs(client)
+
+client.on("ready", () => {
+  client.application?.commands.create({
+    name: "pong",
+    description: "pong!",
+  })
+})
+
+client.on("interactionCreate", (interaction) => {
+  if (interaction.isCommand() && interaction.commandName === "pong") {
+    // Use the reply() function instead of send
+    reacord.reply(interaction, <>pong</>)
+  }
+})
+
+client.login(process.env.DISCORD_TOKEN)
+```
+
+<aside>
+This example uses <a href="https://discord.com/developers/docs/interactions/application-commands#registering-a-command">global commands</a>, so the command might take a while to show up 😅
+</aside>
+
+However, the process of creating commands can get really repetitive and error-prone. A command framework could help with this, or you could make a small helper:
+
+```jsx
+function handleCommands(client, commands) {
+  client.on("ready", () => {
+    for (const { name, description } of commands) {
+      client.application?.commands.create({ name, description })
+    }
+  })
+
+  client.on("interactionCreate", (interaction) => {
+    if (interaction.isCommand()) {
+      for (const command of commands) {
+        if (interaction.commandName === command.name) {
+          command.run(interaction)
+        }
+      }
+    }
+  })
+}
+```
+
+```jsx
+handleCommands(client, [
+  {
+    name: "pong",
+    description: "pong!",
+    run: (interaction) => {
+      reacord.reply(interaction, <>pong</>)
+    },
+  },
+  {
+    name: "hi",
+    description: "say hi",
+    run: (interaction) => {
+      reacord.reply(interaction, <>hi</>)
+    },
+  },
+])
+```
+
+## Ephemeral Command Replies
+
+Ephemeral replies are replies that only appear for one user. To create them, use the `.ephemeralReply()` function.
+
+```tsx
+handleCommands(client, [
+  {
+    name: "pong",
+    description: "pong, but in secret",
+    run: (interaction) => {
+      reacord.ephemeralReply(interaction, <>(pong)</>)
+    },
+  },
+])
+```
+
+The `ephemeralReply` function also returns an instance, but ephemeral replies cannot be updated via `instance.render()`. You can `.deactivate()` them, but `.destroy()` will not delete the message; only the user can hide it from view.