Make menu items functional

src/main.rs

@@ -1,4 +1,4 @@
-use std::{path::PathBuf, thread};
+use std::{path::PathBuf, process, thread};
 
 use anyhow::Result;
 use app::App;
@@ -14,16 +14,24 @@ mod shrooms_vb_core;
 
 #[derive(Parser)]
 struct Args {
-    rom: PathBuf,
+    rom: Option<PathBuf>,
 }
 
 fn main() -> Result<()> {
     let args = Args::parse();
 
-    let (builder, client) = EmulatorBuilder::new();
-    let builder = builder.with_rom(&args.rom);
+    let (mut builder, client) = EmulatorBuilder::new();
+    if let Some(path) = args.rom {
+        builder = builder.with_rom(&path);
+    }
     thread::spawn(move || {
-        let mut emulator = builder.build().unwrap();
+        let mut emulator = match builder.build() {
+            Ok(e) => e,
+            Err(err) => {
+                eprintln!("Error initializing emulator: {err}");
+                process::exit(1);
+            }
+        };
         emulator.run();
     });