use std::collections::HashMap;
use std::fs::{read_dir, File};
use std::io::prelude::*;
use std::io::{self, BufReader};
use std::path::{Path, PathBuf};

fn read_all<P: AsRef<Path>>(path: P) -> io::Result<HashMap<PathBuf, usize>> {
    let dir = read_dir(path)?;
    dir.map(|entry| {
        entry.and_then(|entry| {
            File::open(entry.path()).map(|file| {
                let lines = BufReader::new(file).lines().count();
                (entry.path(), lines)
            })
        })
    }).collect::<io::Result<HashMap<_, _>>>()
}

fn main() {
    let hash_map = read_all("etc/boilerpipe").unwrap();
}