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use parse::Item;
use std::io::{self, Write};
use std::fmt;

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum LineEnding {
    Linefeed,
    CrLf,
}

impl Default for LineEnding {
    fn default() -> Self {
        LineEnding::CrLf
    }
}

impl fmt::Display for LineEnding {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", match *self {
            LineEnding::Linefeed => "\n",
            LineEnding::CrLf => "\r\n",
        })
    }
}

#[derive(Debug, Copy, Clone)]
pub struct Writer<W> {
    write: W,
    line_ending: LineEnding,
}

impl<W> Writer<W> {
    pub fn new(write: W, line_ending: LineEnding) -> Self {
        Writer {
            write: write,
            line_ending: line_ending,
        }
    }

    pub fn into_inner(self) -> W {
        self.write
    }
}

impl<W: Write> Writer<W> {
    pub fn write(&mut self, item: &Item) -> io::Result<()> {
        match *item {
            Item::Section { ref name } => write!(&mut self.write, "[{}]{}", name, self.line_ending),
            Item::Value { ref key, ref value } => write!(&mut self.write, "{}={}{}", key, value, self.line_ending),
            Item::Comment { ref text } => write!(&mut self.write, ";{}{}", text, self.line_ending),
            Item::Empty => write!(&mut self.write, "{}", self.line_ending),
        }
    }
}