Add support for not starting on same port.

src/main.rs

@@ -5,6 +5,7 @@ extern crate actix_web;
 extern crate reqwest;
 extern crate crypto;
 extern crate env_logger;
+#[macro_use] extern crate log;
 
 extern crate rookeries;
 
@@ -55,7 +56,8 @@ fn main() {
     if args.arg_port > 0 {
         let app = run_server(args.arg_port);
         if app.is_err() {
-            eprintln!("Could not start server... exiting...");
+            error!("Could not start server on port {} because {}", args.arg_port, app.unwrap_err());
+            info!("Exiting...");
             std::process::exit(1);
         }
     }

src/web.rs

@@ -193,9 +193,9 @@ pub fn run_server(port: u32) -> Result<(), Box<Error>> {
             .resource("/auth", |r| r.post().with(auth))
             .resource("/api/pages/{slug}", |r| r.get().with(serve_page))
     })
-        .bind(format!("0.0.0.0:{}", port))
-        .unwrap()
+        .bind(format!("0.0.0.0:{}", port))?
         .run();
 
+    info!("Exiting...");
     Ok(())
 }