add circle rhai repl and backend start cmd

rhai_repl_cli/examples/connect_and_play.rs

@@ -0,0 +1,43 @@
+use circle_client_ws::CircleWsClient;
+use std::env;
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tracing_subscriber::fmt()
+        .with_env_filter(EnvFilter::from_default_env().add_directive("connect_and_play=info".parse().unwrap()).add_directive("circle_client_ws=info".parse().unwrap()))
+        .init();
+
+    let args: Vec<String> = env::args().collect();
+    let ws_url = args.get(1).cloned().unwrap_or_else(|| {
+        let default_url = "ws://127.0.0.1:8081/ws".to_string();
+        println!("No WebSocket URL provided. Defaulting to: {}", default_url);
+        default_url
+    });
+
+    println!("Attempting to connect to {}...", ws_url);
+    let mut client = CircleWsClient::new(ws_url.clone());
+
+    if let Err(e) = client.connect().await {
+        eprintln!("Failed to connect to {}: {}", ws_url, e);
+        return Err(e.into());
+    }
+    println!("Connected to {}!", ws_url);
+
+    let script = "let a = 10; let b = 32; let message = \"Hello from example script!\"; message + \" Result: \" + (a + b)";
+    println!("\nSending script:\n```rhai\n{}\n```", script);
+
+    match client.play(script.to_string()).await {
+        Ok(play_result) => {
+            println!("\nServer response:\nOutput: {}", play_result.output);
+        }
+        Err(e) => {
+            eprintln!("\nError executing script: {}", e);
+        }
+    }
+
+    client.disconnect().await;
+    println!("\nDisconnected from {}.", ws_url);
+
+    Ok(())
+}