tentative argument parsing

src/bin/cat.rs

@@ -8,16 +8,30 @@ use std::process;
 
 fn main() {
   let args: Vec<String> = env::args().skip(1).collect();
+  let mut opts = Vec::new();
   
-  for i in args {
+  for arg in &args {
-    let mut arg = i.as_str();
+    if arg.starts_with("-") {
-    match arg {
+      opts.push(arg);
-      "-u" => process::exit(1),
+    }
-
-      _ => {
-        print!("{}", read_to_string(arg).unwrap())
-      },
-    };
   }
+
+  if opts.is_empty() == false {
+    for option in opts {
+      match option.as_str() {
+        // Write  bytes  from the input file to the standard output without
+        // delay as each is read.
+        "-u" => {},
+
+        _ => process::exit(1),
+      };
+    }
+  }
+  else { 
+    for path in args {
+      print!("{}", read_to_string(path).unwrap());
+    }
+  }
+
   stdout().flush().unwrap();
 }