misc: CLI ergonomic improvements

src/main.rs

@@ -19,31 +19,30 @@ struct Args {
 
 #[derive(Debug, Subcommand)]
 enum Command {
-    Run {
-        #[clap(short, long)]
-        command: String,
-    },
+    #[clap(name = "-c", about = "Run a program passed in as a string")]
+    RunCommand { command: String },
+
+    #[clap(about = "Run a Mute file")]
+    Run { file: String },
+
+    #[clap(about = "Start a REPL")]
     Repl,
 }
 
-impl std::default::Default for Command {
-    fn default() -> Self {
-        Command::Repl
-    }
-}
-
 fn main() {
-    if std::env::args().len() == 1 {
-        repl();
-        return;
-    }
-
     let args = Args::parse();
 
     match args.command {
-        Command::Run { command } => {
+        Command::Run { file } => {
+            let input = std::fs::read_to_string(file).unwrap();
+            let res = run(&input);
+            match res {
+                Ok(expressions) => expressions.into_iter().for_each(|expr| println!("{expr}")),
+                Err(err) => println!("{}", err),
+            }
+        }
+        Command::RunCommand { command } => {
             let res = run(&command);
-
             match res {
                 Ok(expressions) => expressions.into_iter().for_each(|expr| println!("{expr}")),
                 Err(err) => println!("{}", err),