feat: add simple prompt

src/main.rs

@@ -1,11 +1,17 @@
+mod prompt;
+
 use rustyline::error::ReadlineError;
 use rustyline::{Editor, Result};
 
+use crate::prompt::Prompt;
+
 fn main() -> Result<()> {
     let mut rl = Editor::<()>::new()?;
 
+    let mut prompt = Prompt::new();
+
     loop {
-        let readline = rl.readline("» ");
+        let readline = rl.readline(&prompt.get_prompt());
 
         match readline {
             Ok(line) => {

src/prompt.rs

@@ -0,0 +1,11 @@
+pub struct Prompt {}
+
+impl Prompt {
+    pub fn new() -> Self {
+        Self {}
+    }
+
+    pub fn get_prompt(&mut self) -> String {
+        format!("» ")
+    }
+}