add delete command to clean up the channel

src/commands/delete.rs

@@ -0,0 +1,44 @@
+use std::{env, error::Error, num::NonZeroU64, time::Duration};
+use tokio::time::sleep;
+use tracing::info;
+use twilight_model::{channel::Message, id::Id};
+
+use crate::state::State;
+
+pub(crate) async fn delete(
+    msg: Message,
+    state: State,
+) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
+    let admin = env::var("ADMIN")?.parse::<u64>()?;
+    if msg.author.id != Id::from(NonZeroU64::new(admin).unwrap()) {
+        return Ok(());
+    }
+    let n = msg
+        .content
+        .split(' ')
+        .last()
+        .unwrap()
+        .parse::<u16>()
+        .unwrap_or(1);
+    if n > 100 {
+        return Ok(());
+    }
+    let messages = state
+        .http
+        .channel_messages(msg.channel_id)
+        .before(msg.id)
+        .limit(n)?
+        .await?
+        .model()
+        .await?;
+    state.http.delete_message(msg.channel_id, msg.id).await?;
+    for message in messages {
+        info!("Delete message: {:?}: {:?}", message.author.name, message);
+        state
+            .http
+            .delete_message(msg.channel_id, message.id)
+            .await?;
+        sleep(Duration::from_secs(5)).await;
+    }
+    Ok(())
+}