src/input.rs

@@ -1,5 +1,6 @@
 use std::io as stdio;
 use stdio::stdin;
+use crate::parser;
 
 pub struct Buffer {
     buffer: String,
@@ -27,11 +28,11 @@ impl Buffer {
         }
     }
 
-    pub fn is_empty(&self) -> bool {
-        self.buffer.is_empty()
-    }
-
-    pub fn get_buffer(&self) -> &String {
-        &self.buffer
+    pub fn parse(&self) -> Option<Vec<String>> {
+        if ! self.buffer.is_empty() {
+            Some(parser::parse(&self.buffer))
+        } else {
+            None
+        }
     }
 }

src/main.rs

@@ -7,17 +7,15 @@ mod parser;
 fn main() {
     let mut buffer = input::Buffer::new();
     let mut bytes_read: usize = 1;
-    let mut command_line: String;
-    let mut argv: Vec<String>;
+    let mut argv: Option<Vec<String>>;
 
     while bytes_read != 0 {
         output::print_ps1();
         bytes_read = buffer.read_line();
 
-        if ! buffer.is_empty() {
-            command_line = buffer.get_buffer().to_string();
-            argv = parser::parse(&command_line);
-            println!("{:?}", argv);
+        argv = buffer.parse();
+        if argv.is_some() {
+            println!("{:?}", argv.unwrap());
         }
     }