feat: add ls command

src/builtins/ls.rs

@@ -0,0 +1,28 @@
+use std::{fs::File, io::stdout, path::PathBuf, str::FromStr};
+
+use crate::error::ShellError;
+
+use super::{Builtin, BuiltinConfig};
+
+pub struct Ls;
+
+impl Builtin for Ls {
+    fn execute(&mut self, _: &mut BuiltinConfig, args: Vec<String>) -> Result<(), ShellError> {
+        let dir = std::env::current_dir().unwrap_or(PathBuf::from_str("/").unwrap());
+        let entries = match std::fs::read_dir(dir) {
+            Ok(e) => e,
+            Err(e) => return Err(ShellError::ExecuteFailure(e.to_string())),
+        };
+        for entry in entries {
+            let entry = match entry {
+                Ok(e) => e,
+                Err(e) => {
+                    println!("Couldn't get directory entry");
+                    continue;
+                }
+            };
+            println!("{}", entry.file_name().to_string_lossy())
+        }
+        Ok(())
+    }
+}

src/builtins/mod.rs

@@ -6,6 +6,7 @@ mod cd;
 mod change_prompt;
 mod exit;
 mod fetch;
+mod ls;
 mod open;
 mod pwd;
 
@@ -33,6 +34,7 @@ const BUILTINS: Lazy<Vec<(&str, Box<dyn Builtin>)>> = Lazy::new(|| {
         ("pwd", Box::new(pwd::Pwd)),
         ("open", Box::new(open::Open)),
         ("fetch", Box::new(fetch::Fetch)),
+        ("ls", Box::new(ls::Ls)),
     ]
 });