implemented history for the line editor

src/prompt/mod.rs

@@ -14,18 +14,18 @@ fn get_prompt() -> ShResult<String> {
 		//
 		// username@hostname
 		// short/path/to/pwd/
-		// $
+		// $ _
 		let default = "\\n\\e[1;0m\\u\\e[1;36m@\\e[1;31m\\h\\n\\e[1;36m\\W\\e[1;32m/\\n\\e[1;32m\\$\\e[0m ";
-		return Ok(format!("{}",expand_prompt(default)?))
+		return expand_prompt(default)
 	};
 
-	Ok(format!("\n{}",expand_prompt(&prompt)?))
+	expand_prompt(&prompt)
 }
 
 pub fn read_line(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(Some(prompt))?),
 		FernEditMode::Emacs => todo!()
 	};
 	reader.readline()