Implemented prompt expansion

src/builtin/cd.rs

@@ -8,7 +8,8 @@ pub fn cd(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 		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);
+		let new_dir = std::env::current_dir()?;
+		shenv.vars_mut().export("PWD",new_dir.to_str().unwrap());
 		shenv.set_code(0);
 	}
 	Ok(())

src/builtin/export.rs

@@ -6,9 +6,9 @@ pub fn export(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 		let mut argv_iter = argv.into_iter();
 		argv_iter.next(); // Ignore 'export'
 		while let Some(arg) = argv_iter.next() {
-			let arg_raw = shenv.input_slice(arg.span()).to_string();
+			let arg_raw = arg.as_raw(shenv);
 			if let Some((var,val)) = arg_raw.split_once('=') {
-				shenv.vars_mut().export(var, val);
+				shenv.vars_mut().export(var, &clean_string(val));
 			} else {
 				eprintln!("Expected an assignment in export args, found this: {}", arg_raw)
 			}