use std::{
    fs::File,
    io::{self, prelude::*},
};

pub struct BufReader {
    reader: io::BufReader<File>,
}

impl BufReader {
    pub fn open(path: impl AsRef<std::path::Path>) -> io::Result<Self> {
        let file = File::open(path)?;
        let reader = io::BufReader::new(file);

        Ok(Self { reader })
    }

    pub fn read_line<'buf>(
        &mut self,
        buffer: &'buf mut String,
    ) -> Option<io::Result<&'buf mut String>> {
        buffer.clear();

        self.reader
            .read_line(buffer)
            .map(|u| if u == 0 { None } else { Some(buffer) })
            .transpose()
    }
}