feat: rework command execution

src/execute.rs

@@ -1,29 +1,28 @@
-use std::{
-    io::{self},
-    process::{ChildStdout, Command, Stdio},
-};
+use std::process::Command;
 
+use crate::error::ShellError;
+use crate::error::ShellError::Execute;
 use crate::parse::parse_line;
 
-pub fn execute<S: Into<Stdio>>(mut command: Command, stdin: S) -> io::Result<(ChildStdout, Stdio)> {
-    command.stdin(stdin);
-    command.stdout(Stdio::piped());
-
-    let handle = command.spawn()?;
-
-    let stdout = handle.stdout.unwrap();
-    let stderr = match handle.stderr {
-        Some(err) => Stdio::from(err),
-        None => Stdio::null(),
-    };
-    Ok((stdout, stderr))
-}
-
-pub fn interpret(line: &str) -> io::Result<()> {
+pub fn interpret(line: &str) -> Result<(), ShellError> {
     let (keyword, args) = parse_line(line);
+
     let mut command = Command::new(keyword);
     command.args(args);
-    let (mut stdout, _) = execute(command, Stdio::null())?;
-    io::copy(&mut stdout, &mut io::stdout())?;
+
+    execute(command)?;
+
     Ok(())
 }
+
+fn execute(mut command: Command) -> Result<(), ShellError> {
+    match command.spawn() {
+        Ok(mut child) => {
+            if let Err(err) = child.wait() {
+                return Err(Execute(err.to_string()));
+            }
+            Ok(())
+        }
+        Err(err) => Err(Execute(err.to_string())),
+    }
+}

src/main.rs

@@ -3,6 +3,7 @@ mod execute;
 mod parse;
 mod prompt;
 
+use crate::error::ShellError;
 use execute::interpret;
 use rustyline::error::ReadlineError;
 use rustyline::{Editor, Result};
@@ -18,11 +19,12 @@ fn main() -> Result<()> {
         let readline = rl.readline(&prompt.get_prompt());
 
         match readline {
-            Ok(line) => {
-                if let Err(err) = interpret(&line) {
-                    println!("{}", err);
+            Ok(line) => match interpret(&line) {
+                Ok(_) => {}
+                Err(ShellError::Execute(err)) => {
+                    eprintln!("{}", err)
                 }
-            }
+            },
             Err(ReadlineError::Interrupted) => {
                 break;
             }