Split main() into subfunctions

src/main.rs

@@ -21,6 +21,13 @@ mod eval;
 fn main() {
     let args: Vec<String> = std::env::args().collect();
     if let Some(filename) = args.get(1) {
+        run_noninteractive(filename);
+    } else {
+        run_repl();
+    }
+}
+
+fn run_noninteractive(filename: &String) {
     let mut source_file = File::open(&Path::new(filename)).unwrap();
     let mut buffer = String::new();
     source_file.read_to_string(&mut buffer).unwrap();
@@ -40,8 +47,9 @@ fn main() {
     for result in results.iter() {
         println!("{}", result);
     }
+}
 
-    } else {
+fn run_repl() {
     println!("Schala v 0.02");
     let initial_state = InterpreterState {
         show_tokens: false,
@@ -51,7 +59,6 @@ fn main() {
     REPL::with_prompt_and_state(Box::new(repl_handler), ">> ", initial_state)
         .run();
 }
-}
 
 struct InterpreterState {
     show_tokens: bool,