open.rs

use std::fs::File;
use std::io::BufReader;
use std::io::prelude::*;
use std::path::Path;

fn open<P: AsRef<Path>>(path: P) -> Result<std::io::Lines<BufReader<File>>, std::io::Error> {
    let file = File::open(path)?;
    let reader = BufReader::new(file);
    Ok(reader.lines())
}