use std::path::PathBuf;

#[macro_export] 
macro_rules! nu {
    ($out:ident, $cwd:expr, $commands:expr) => {
        use std::error::Error;
        use std::io::prelude::*;
        use std::process::{Command, Stdio};

        let commands = &*format!("
                            cd {}
                            {}
                            exit", 
                            $cwd, 
                            $commands);

        let process = match Command::new(helpers::executable_path())
            .stdin(Stdio::piped())
            .stdout(Stdio::piped())
            .spawn() {
                Ok(child) => child,
                Err(why) => panic!("Can't run test {}", why.description()),
        };

        match process.stdin.unwrap().write_all(commands.as_bytes()) {
            Err(why) => panic!("couldn't write to wc stdin: {}", why.description()),
            Ok(_) => {}
        }

        let mut _s = String::new();

        match process.stdout.unwrap().read_to_string(&mut _s) {
            Err(why) => panic!("couldn't read stdout: {}", why.description()),
            Ok(_) => { 
                let _s = _s.replace("\r\n", "\n");
            }
        }

        let $out = _s.replace("\n", "");
    };
}

#[macro_export] 
macro_rules! nu_error {
    ($out:ident, $cwd:expr, $commands:expr) => {
        use std::error::Error;
        use std::io::prelude::*;
        use std::process::{Command, Stdio};

        let commands = &*format!("
                            cd {}
                            {}
                            exit", 
                            $cwd, 
                            $commands);

        let mut process = Command::new(helpers::executable_path())
            .stdin(Stdio::piped())
            .stderr(Stdio::piped())
            .spawn()
            .expect("couldn't run test");

        let stdin = process.stdin.as_mut().expect("couldn't open stdin");
        stdin.write_all(commands.as_bytes()).expect("couldn't write to stdin");


        let output = process.wait_with_output().expect("couldn't read from stderr");
        let $out = String::from_utf8_lossy(&output.stderr);
    };
}

pub fn executable_path() -> PathBuf {
    let mut buf = PathBuf::new();
        buf.push("target");
        buf.push("debug");
        buf.push("nu");
        buf
}

pub fn in_directory(str: &str) -> &str {
    str
}