patch-rs 0.6.2

Rust patch implementation
Documentation 
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//!
//! The Patch binary.
//!

use std::{
    fs,
    io::{self, BufRead},
};

use patch_rs::{PatchProcessor, PatchError};

fn read_to_vec(path: &str) -> io::Result<Vec<String>> {
    let file = fs::File::open(path)?;
    let file = io::BufReader::new(file);
    file.lines().collect()
}

#[derive(Debug)]
enum Error {
    Reading(io::Error),
    Patch(PatchError),
}

fn main() -> Result<(), Error> {
    env_logger::Builder::from_default_env()
        .default_format_timestamp_nanos(true)
        .init();

    let args = clap::App::new(env!("CARGO_PKG_NAME"))
        .version(env!("CARGO_PKG_VERSION"))
        .author(env!("CARGO_PKG_AUTHORS"))
        .about(env!("CARGO_PKG_DESCRIPTION"))
        .arg(
            clap::Arg::with_name("file")
                .help("The file to patch")
                .index(1)
                .value_name("FILE")
                .takes_value(true)
                .required(true),
        )
        .arg(
            clap::Arg::with_name("patch")
                .help("The patch")
                .index(2)
                .value_name("PATCH")
                .takes_value(true)
                .required(true),
        )
        .get_matches();

    let file = args.value_of("file").expect("Unreachable");
    let patch = args.value_of("patch").expect("Unreachable");

    let text = read_to_vec(file).map_err(Error::Reading)?;
    let patch = fs::read_to_string(patch).map_err(Error::Reading)?;

    let parser = PatchProcessor::converted(text, &patch).map_err(Error::Patch)?;
    for s in parser.process().map_err(Error::Patch)? {
        println!("{}", s);
    }

    Ok(())
}