README.md

@@ -17,4 +17,3 @@ I want to learn Rust and see how much effort I can put into making an interopera
   - [ ] `type`
 - [ ] Command-line flags
 - [ ] PS1
-- [ ] Execute code from a file

src/command/command_builder.rs

@@ -7,8 +7,13 @@ pub struct CommandBuilder {
 }
 
 impl CommandBuilder {
-    pub fn new(argv: Vec<String>) -> Self {
-        Self { argv }
+    pub fn new() -> Self {
+        Self { argv: Vec::new() }
+    }
+
+    pub fn argv(&mut self, argv: Vec<String>) -> &Self {
+        self.argv = argv;
+        self
     }
 
     pub fn build(&self) -> Box<dyn Command> {

src/parser.rs

@@ -5,7 +5,7 @@ pub fn parse_command_line(line: String) -> Option<CommandSequence> {
     let argv: Vec<String> = line.split_whitespace().map(|s| s.to_string()).collect();
 
     if !argv.is_empty() {
-        let command = CommandBuilder::new(argv).build();
+        let command = CommandBuilder::new().argv(argv).build();
         Some(CommandSequence::new(command))
     } else {
         None