split main.rs into files

src/commands/join.rs

@@ -0,0 +1,31 @@
+use std::{error::Error, num::NonZeroU64};
+use twilight_model::channel::Message;
+
+use crate::state::State;
+
+pub(crate) async fn join(
+    msg: Message,
+    state: State,
+) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
+    let user_id = msg.author.id;
+    let guild_id = msg.guild_id.ok_or("No guild id attached to the message.")?;
+    let channel_id = state
+        .cache
+        .voice_state(user_id, guild_id)
+        .ok_or("Cannot get voice state for user")?
+        .channel_id();
+    let channel_id =
+        NonZeroU64::new(channel_id.into()).ok_or("Joined voice channel must have nonzero ID.")?;
+    state
+        .songbird
+        .join(guild_id, channel_id)
+        .await
+        .map_err(|e| format!("Could not join voice channel: {:?}", e))?;
+
+    // signal that we are not listening
+    if let Some(call_lock) = state.songbird.get(guild_id) {
+        let mut call = call_lock.lock().await;
+        call.deafen(true).await?;
+    }
+    Ok(())
+}