#[derive(Clone, Debug)]
pub struct LinesWithTerminator<'a> {
    data: &'a str,
}

impl<'a> LinesWithTerminator<'a> {
    pub fn new(data: &'a str) -> LinesWithTerminator<'a> {
        LinesWithTerminator { data }
    }
}

impl<'a> Iterator for LinesWithTerminator<'a> {
    type Item = &'a str;

    #[inline]
    fn next(&mut self) -> Option<&'a str> {
        match self.data.find('\n') {
            None if self.data.is_empty() => None,
            None => {
                let line = self.data;
                self.data = "";
                Some(line)
            }
            Some(end) => {
                let line = &self.data[..end + 1];
                self.data = &self.data[end + 1..];
                Some(line)
            }
        }
    }
}