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//! patch-rs is a parser library for [Unified Format]
//! (https://www.gnu.org/software/diffutils/manual/html_node/Unified-Format.html#Unified-Format)
//! diffs.
//!
//! GVR also honed down the spec a bit more:
//! http://www.artima.com/weblogs/viewpost.jsp?thread=164293

#[macro_use]
extern crate nom;
extern crate chrono;

use std::error::Error;
use nom::{IResult, Err};

pub use self::parser::{Patch, File, FileMetadata};
use self::parser::{patch};

mod parser;

#[derive(Debug)]
pub enum PatchError {
    ParseError,
}

impl std::fmt::Display for PatchError {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        match *self {
            PatchError::ParseError =>
                write!(f, "Error while parsing"),
        }
    }
}

impl Error for PatchError {
    fn description(&self) -> &str {
        match *self {
            PatchError::ParseError =>
                "parse error",
        }
    }
}


pub fn parse(diff: &str) -> Result<Patch, PatchError> {
    match patch(diff.as_bytes()) {
        IResult::Done(_, ((old, new), hunks, no_newline)) =>
            Ok(Patch {
                old: old,
                new: new,
                hunks: hunks,
                no_newline: no_newline,
            }),
        IResult::Incomplete(x) => {
            println!("incomplete {:?}", x);
            Err(PatchError::ParseError)
        },
        IResult::Error(x) => {
            if let Err::Position(_, chrs) = x {
                println!("chrs {:?}", std::str::from_utf8(chrs));
            }
            // println!("{:?}", x);
            Err(PatchError::ParseError)
        },
    }
}