Create basic echo bot

Cargo.toml

@@ -6,3 +6,13 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = "1.0.52"
+
+[dependencies.tokio]
+version = "1.15.0"
+features = ["full"]
+
+[dependencies.serenity]
+version = "0.10"
+default-features = false
+features = ["builder", "cache", "client", "gateway", "model", "utils", "native_tls_backend"]

src/main.rs

@@ -1,3 +1,44 @@
-fn main() {
-    println!("Hello, world!");
+use std::env;
+
+use serenity::{prelude::*, async_trait, model::{channel::Message, id::ChannelId}, http::CacheHttp};
+
+struct Handler;
+
+#[async_trait]
+impl EventHandler for Handler {
+    async fn message(&self, ctx: Context, msg: Message) {
+        let nick = {
+            if let Some(member) = msg.member {
+                match member.nick {
+                    Some(n) => n,
+                    None => msg.author.name
+                }
+            } else {
+                msg.author.name
+            }
+        };
+
+        msg.channel_id.say(&ctx, format!("{}: {}", nick, msg.content)).await.unwrap();
+    }
 }
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    let token = env::var("DISCORD_TOKEN").expect("DISCORD_TOKEN not set");
+
+    let mut client = Client::builder(&token)
+        .event_handler(Handler)
+        .await?;
+
+    let channel_id = ChannelId(831255708875751477);
+
+    client.start().await?;
+
+    Ok(())
+}
+
+async fn send_message(client: &Client, channel_id: &ChannelId, content: &str) -> anyhow::Result<Message> {
+    let http = client.cache_and_http.http();
+
+    Ok(channel_id.say(http, content).await?)
+}