use std::process;
use std::env;
use std::fs;

fn main() {
    let args: Vec<String> = env::args().collect();
    let config = Config::new(&args).unwrap_or_else(|err| {
        println!("Problem parsing arguments: {}", err);
        process::exit(1);
    });

    println!("Searching for {}", config.query);
    println!("In file {}", config.filename);

    let contents = fs::read_to_string(config.filename)
        .expect("something went wrong.");

    dbg!(contents);
}

struct Config {
    query: String,
    filename: String,
}

impl Config {


    fn new(args: &[String]) -> Result<Config, &'static str> {

        if args.len() < 3 {
            panic!("not enough args");
        }

        let query = args[1].clone();
        let filename = args[2].clone();
        Ok(Config { query, filename })
    }

}