refactor

src/main.rs

@@ -11,46 +11,51 @@ fn get_input() -> String {
     io::stdin()
         .read_line(&mut input)
         .expect("failed to readline");
+    // Remove newline character from the input. 
     input.pop();
-    return input;
+    input
 }
 
 fn parse_input(s: &str) -> Vec<&str> {
-    return s.split_whitespace().collect();
+    s.split_whitespace().collect()
 }
 
-fn get_command(v: Vec<&str>) -> String {
-    return v[0..1].concat();
+fn get_command(tokens: Vec<&str>) -> &str {
+    tokens[0]
 }
 
-fn get_args(v: Vec<&str>) -> Vec<&str> {
-    return v[1..].to_vec();
+fn get_args(tokens: Vec<&str>) -> Vec<&str> {
+    tokens[1..].to_vec()
 }
 
-fn run_command(cmd: String, args: Vec<&str>) {
-    let mut child = Command::new(cmd)
+fn run_command(cmd: &str, args: Vec<&str>) {
+    let status = Command::new(cmd)
         .args(args)
-        .spawn()
+        .status()
         .expect("failed to execute process");
 
-    child.wait().expect("failed to wait on child");
+    assert!(status.success());
 }
 
 fn main() {
     loop {
-        // Display the prompt for the user and wait for input.
+        // Display the prompt for the user.
         display_prompt();
 
-        // Get the users input and store it as &str
+        // Get the users input.
         let input = get_input();
-        let input = input.as_str();
 
         // Parse the users input and create tokens.
-        let tokens = parse_input(input);
+        let tokens = parse_input(&input);
+
+        // If the user enters empty input don't execute the command.
+        if tokens.is_empty() {
+            continue;
+        }
 
         // Convert our tokens to our command and arguments.
         let cmd = get_command(tokens.clone());
-        let args = get_args(tokens.clone());
+        let args = get_args(tokens);
 
         // Run the command and arguments.
         run_command(cmd, args);