looks like I'm cookin with gas now

src/main.rs

@@ -154,6 +154,14 @@ fn eval(line: String) -> Result<()> {
             println!("{}", pb.as_path().as_os_str().to_str().unwrap());
             return Ok(());
         }
+        "cd" => {
+            let cwd = std::env::current_dir()?;
+            if parts.len() > 1 {
+                let target = cwd.join(parts[1]);
+                std::env::set_current_dir(target)?;
+                return Ok(());
+            }
+        }
         "printenv" => {
             if parts.len() > 1 {
                 let name = parts[1];
@@ -188,6 +196,10 @@ fn eval(line: String) -> Result<()> {
         }
         _ => {
             let mut proc = std::process::Command::new(cmd);
+            if parts.len() > 1 {
+                let args = parts[1..].to_vec();
+                proc.args(args);
+            }
             match proc.spawn() {
                 Ok(mut child) => {
                     if let Err(e) = child.wait() {
@@ -233,7 +245,9 @@ fn main() -> Result<()> {
 
                 if event.code == key::ENTER {
                     newline(stdout)?;
-                    eval(line.pop())?;
+                    if let Err(e) = eval(line.pop()) {
+                        println!("error: {}", e);
+                    }
                     prompt.print()?;
                     continue;
                 }