assert_contains_cli 0.1.1

very simple cli to assert a string is contained or not contained in a stream 
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use std::env;

use std::io::{self, Read};
use std::process;

fn main() {
    let args: String = env::args().skip(1).collect::<Vec<String>>().join(" ");
    let mut buffer = String::new();
    io::stdin().read_to_string(&mut buffer).unwrap();
    if !buffer.contains(&args) {
        eprintln!("error: {:?} not found", args);
        process::exit(0x0100);
    }
}