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extern crate structopt;
#[macro_use]
extern crate structopt_derive;
use structopt::StructOpt;
use std::path::PathBuf;
use std::io::BufReader;
use std::io::prelude::*;
use std::fs::File;
use std::process;
#[derive(StructOpt, Debug)]
#[structopt(name = "AOC2017", about = "An Advent of Code CLI arguments object.")]
struct AdventCli {
#[structopt(help = "Which part of the puzzle you are solving")]
part: u32,
#[structopt(help = "Input file", parse(from_os_str))]
input: PathBuf
}
pub struct AdventArgs {
pub part: u32,
pub input: Vec<String>
}
impl AdventArgs {
pub fn init() -> AdventArgs {
let opt = AdventCli::from_args();
let input = match AdventArgs::read_file(&opt.input) {
Ok(input) => input,
Err(error) => {
// Typically I would think of exiting the program like
// this to be bad form, but in this case I'm matching the
// interface of StructOpt: if the input parameters were
// invalid, just quit now with a nice message.
eprintln!("Error reading file: {}", error);
process::exit(1);
}
};
AdventArgs {
part: opt.part,
input: input
}
}
fn read_file(file: &PathBuf) -> Result<Vec<String>, std::io::Error> {
let file = File::open(file)?;
let file_reader = BufReader::new(file);
file_reader.lines()
.collect::<Result<Vec<_>, _>>()
.map(AdventArgs::preprocess_file_lines)
}
fn preprocess_file_lines(lines: Vec<String>) -> Vec<String> {
lines.iter()
.filter(|line| line.len() > 0)
.map(|line| line.trim().to_string())
.collect()
}
}
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