feat: change directory to home if no argument is given to cd

Cargo.lock

@@ -60,6 +60,15 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "dirs"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca3aa72a6f96ea37bbc5aa912f6788242832f75369bdfdadcb0e38423f100059"
+dependencies = [
+ "dirs-sys",
+]
+
 [[package]]
 name = "dirs-next"
 version = "2.0.0"
@@ -70,6 +79,17 @@ dependencies = [
  "dirs-sys-next",
 ]
 
+[[package]]
+name = "dirs-sys"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b1d1d91c932ef41c0f2663aa8b0ca0342d444d842c06914aa0a7e352d0bada6"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi",
+]
+
 [[package]]
 name = "dirs-sys-next"
 version = "0.1.2"
@@ -210,6 +230,7 @@ version = "0.1.0"
 dependencies = [
  "crossbeam-channel",
  "ctrlc",
+ "dirs",
  "once_cell",
  "rustyline",
  "shlex",

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 [dependencies]
 crossbeam-channel = "0.5"
 ctrlc = "3.2"
+dirs = "4.0"
 once_cell = "1.17"
 rustyline = "10.1.0"
 shlex = "1.1"

src/builtins/cd.rs

@@ -1,5 +1,6 @@
 use crate::builtins::{Builtin, BuiltinConfig};
 use std::env::set_current_dir;
+use std::path::Path;
 
 use crate::error::ShellError;
 
@@ -7,11 +8,17 @@ pub struct Cd;
 
 impl Builtin for Cd {
     fn execute(&mut self, _: &mut BuiltinConfig, args: Vec<String>) -> Result<(), ShellError> {
-        let Some(first) = args.get(0) else {
-            return Err(ShellError::ExecuteFailure("no argument given".to_string()))
+        let dir = match args.get(0) {
+            Some(first) => Path::new(first).to_path_buf(),
+            None => {
+                let Some(home) = dirs::home_dir() else {
+                    return Ok(())
+                };
+                home
+            }
         };
 
-        set_current_dir(first).map_err(|e| ShellError::ExecuteFailure(e.to_string()))
+        set_current_dir(dir).map_err(|e| ShellError::ExecuteFailure(e.to_string()))
     }
 }