1 files changed, 47 insertions, 0 deletions
diff --git a/src/cli.rs b/src/cli.rs
new file mode 100644
index 0000000..b165677
--- /dev/null
+++ b/src/cli.rs
@@ -0,0 +1,47 @@
+use std::io;
+
+use axum::{routing::get, Router};
+use clap::Parser;
+
+#[derive(Parser)]
+pub struct Args {
+    #[arg(short, long, env, default_value = "localhost")]
+    address: String,
+
+    #[arg(short, long, env, default_value_t = 64209)]
+    port: u16,
+}
+
+impl Args {
+    pub async fn run(self) -> io::Result<()> {
+        let app = Router::new().route("/", get(hello));
+
+        let listener = self.listener().await?;
+        let started_msg = started_msg(&listener)?;
+
+        let serve = axum::serve(listener, app);
+        println!("{started_msg}");
+        serve.await?;
+
+        Ok(())
+    }
+
+    async fn listener(&self) -> io::Result<tokio::net::TcpListener> {
+        let listen_addr = self.listen_addr();
+        let listener = tokio::net::TcpListener::bind(listen_addr).await?;
+        Ok(listener)
+    }
+
+    fn listen_addr(&self) -> impl tokio::net::ToSocketAddrs + '_ {
+        (self.address.as_str(), self.port)
+    }
+}
+
+fn started_msg(listener: &tokio::net::TcpListener) -> io::Result<String> {
+    let local_addr = listener.local_addr()?;
+    Ok(format!("listening on http://{local_addr}/"))
+}
+
+async fn hello() -> &'static str {
+    "Hello, world"
+}