feat: add simple directory prompt

src/builtins/change_prompt.rs

@@ -13,6 +13,9 @@ impl Builtin for ChangePrompt {
         } else if let Some(style) = args.get(0) {
             match style.to_lowercase().as_str() {
                 "none" => config.prompt_style = PromptStyle::None,
+                "simple-directory" | "simple_directory" | "simpledirectory" => {
+                    config.prompt_style = PromptStyle::SimpleDirectory
+                }
                 _ => {
                     return Err(ShellError::ExecuteFailure(format!(
                         "{} is not a valid prompt style",

src/prompt.rs

@@ -3,18 +3,24 @@ use std::path::PathBuf;
 #[derive(Clone)]
 pub enum PromptStyle {
     None,
+    SimpleDirectory,
 }
 
 impl PromptStyle {
     pub fn fmt_style(&self, path: PathBuf) -> String {
         match self {
             PromptStyle::None => self.fmt_none(path),
+            PromptStyle::SimpleDirectory => self.fmt_simple_directory(path),
         }
     }
 
     fn fmt_none(&self, _: PathBuf) -> String {
         return "» ".to_string();
     }
+
+    fn fmt_simple_directory(&self, path: PathBuf) -> String {
+        return format!("{} » ", path.to_string_lossy());
+    }
 }
 
 pub struct Prompt {