assert_cli 0.6.3

Test CLI Applications.
Documentation 
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extern crate failure;

use std::env;
use std::io;
use std::io::Write;
use std::process;

use failure::ResultExt;

fn run() -> Result<(), failure::Error> {
    if let Ok(text) = env::var("stdout") {
        println!("{}", text);
    }
    if let Ok(text) = env::var("stderr") {
        eprintln!("{}", text);
    }

    let code = env::var("exit")
        .ok()
        .map(|v| v.parse::<i32>())
        .map_or(Ok(None), |r| r.map(Some))
        .context("Invalid exit code")?
        .unwrap_or(0);
    process::exit(code);
}

fn main() {
    let code = match run() {
        Ok(_) => 0,
        Err(ref e) => {
            write!(&mut io::stderr(), "{}", e).expect("writing to stderr won't fail");
            1
        }
    };
    process::exit(code);
}