copied rustyline's homework

src/prompt/mod.rs

@@ -22,11 +22,11 @@ fn get_prompt() -> ShResult<String> {
 	expand_prompt(&prompt)
 }
 
-pub fn read_line(edit_mode: FernEditMode) -> ShResult<String> {
+pub fn readline(edit_mode: FernEditMode) -> ShResult<String> {
 	let prompt = get_prompt()?;
 	let mut reader: Box<dyn Readline> = match edit_mode {
-		FernEditMode::Vi => Box::new(FernVi::new(Some(prompt))?),
+		FernEditMode::Vi => Box::new(FernVi::new()),
 		FernEditMode::Emacs => todo!()
 	};
-	reader.readline()
+	reader.readline(Some(prompt))
 }