brainheck 0.1.8

Brainheck interpreter written in Rust.
Documentation 
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#[macro_use]

extern crate clap;
extern crate brainheck;

use std::fs::File;
use std::io::prelude::*;
use std::io;
use clap::App;
use brainheck::{brainheck, reverse};

fn main() {
    // parse command-line options
    let yaml = load_yaml!("options-en.yml");
    let matches = App::from_yaml(yaml).get_matches();
    let filename = matches.value_of("INPUT")
        .expect("Unexpected parse error. ");
    let rev: bool = matches.occurrences_of("reverse") == 1 ;
    
    
    // verify input then run program 
    let file = File::open(filename);
    if let Ok(mut f) = file {
        // get stdin
        println!("Enter input then press Ctrl-D to continue, or pass as stdin");
        let mut buffer = String::new();
        io::stdin().read_to_string(&mut buffer)
            .expect("stdin read failed unexpectedly");
        
        println!("\nUsing source file: {}\n", filename);
        
        // set up file string & pointer
        let mut file_str = String::new();
        f.read_to_string(&mut file_str)
            .expect("File read failed unexpectedly"); 
        if rev {
            file_str = reverse(&file_str);
        }
        
        // call function to be our interpreter
        brainheck(file_str, buffer);
    }
    else {
        println!("File read failed. Please verify the file {} exists", filename);
    }
}