handle invalid argument

src/lib.rs

@@ -3,6 +3,7 @@ mod color;
 
 use color::Color;
 use libc::{c_int, c_void};
+use std::process;
 
 const VERSION: &str = "2.0.0";
 
@@ -16,12 +17,18 @@ extern "C" {
 pub extern "C" fn rust_main() {
     println!("Hello from rust");
 
-    let args = args::parse_arguments().unwrap();
+    let args = match args::parse_arguments() {
+        Ok(args) => args,
+        Err(e) => {
+            println!("{e}");
+            process::exit(1);
+        }
+    };
     println!("{:?}", args);
 
     if args.version {
         println!("nms version {VERSION}");
-        std::process::exit(0);
+        process::exit(0);
     }
 
     if let Some(color) = args.foreground {