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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()
}
pub fn one_number_input(&self) -> Result<i32, std::num::ParseIntError> {
self.input[0].parse()
}
}
pub fn parse_space_separated_ints(line: &String) -> Result<Vec<i32>, std::num::ParseIntError> {
line.split_whitespace()
.map(|x| x.parse::<i32>())
.collect()
}
#[derive(Hash, Eq, PartialEq, Debug, Clone, Copy)]
pub struct Point {
pub x: i32,
pub y: i32
}
impl Point {
pub fn up(&self) -> Point {
Point {
y: self.y-1,
..*self
}
}
pub fn down(&self) -> Point {
Point {
y: self.y+1,
..*self
}
}
pub fn left(&self) -> Point {
Point {
x: self.x-1,
..*self
}
}
pub fn right(&self) -> Point {
Point {
x: self.x+1,
..*self
}
}
pub fn shift(&self, dir: &Direction) -> Point {
use Direction::*;
match *dir {
Right => self.right(),
Left => self.left(),
Up => self.up(),
Down => self.down()
}
}
}
#[derive(Debug)]
pub enum Direction {
Left,
Up,
Down,
Right
}
impl Direction {
pub fn rotate_left(&self) -> Direction {
use Direction::*;
match *self {
Right => Up,
Up => Left,
Left => Down,
Down => Right
}
}
pub fn rotate_right(&self) -> Direction {
use Direction::*;
match *self {
Right => Down,
Up => Right,
Left => Up,
Down => Left
}
}
}
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