Early implementation of scripting elements

src/builtin/cd.rs

@@ -5,7 +5,7 @@ pub fn cd(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 	if let NdRule::Command { argv, redirs: _ } = rule {
 		let mut argv_iter = argv.into_iter();
 		argv_iter.next(); // Ignore 'cd'
-		let dir_raw = argv_iter.next().map(|arg| arg.to_string()).unwrap_or(std::env::var("HOME")?);
+		let dir_raw = argv_iter.next().map(|arg| shenv.input_slice(arg.span()).into()).unwrap_or(std::env::var("HOME")?);
 		let dir = PathBuf::from(&dir_raw);
 		std::env::set_current_dir(dir)?;
 		shenv.vars_mut().export("PWD",&dir_raw);