fix for 'port already in use' not being implemented, causing panic

src/main.rs

@@ -22,5 +22,7 @@ fn main() {
         std::process::exit(1);
     }
 
-    server::run(root, port);
+    if let Err(_) = server::run(root, port) {
+        log_error!("Port {} already in use!", port);
+    }
 }

src/server.rs

@@ -7,9 +7,14 @@ use tiny_http::Server;
 use crate::router;
 use crate::response;
 
-pub fn run(root: Arc<PathBuf>, port: u16) {
+pub fn run(
-    let addr = format!("0.0.0.0:{}", port);
+    root: Arc<PathBuf>,
-    let server = Arc::new(Server::http(&addr).expect("Failed to start server"));
+    port: u16
+) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+
+    let addr = format!("0.0.0.0:{}", port); // serve localhost
+
+    let server = Arc::new(Server::http(&addr)?);
     let pool = ThreadPool::new(num_cpus());
 
     log_info!("Serving '{}' on http://{}", root.display(), addr);
@@ -34,6 +39,8 @@ pub fn run(root: Arc<PathBuf>, port: u16) {
             }
         });
     }
+
+    Ok(())
 }
 
 fn num_cpus() -> usize {