{"header":{"message":"Day 12 solution","description":null,"timestamp":"2021-03-16T01:07:10Z","authors":[{"email":"jeremy.list@youdo.co.nz","name":"Jeremy List"}]},"hash":"OCUJJOPFOAAVUXKRNYTFNNTOYL2TZR2QG2CYSC57GGK2V6UL5IIQC","authors":[],"deps":{"hashes":[["OCUJJOPFOAAVUXKRNYTFNNTOYL2TZR2QG2CYSC57GGK2V6UL5IIQC","Day 12 solution"],["AA",null],["B527MN663VOX7PY6BCLAAU62WDPTI4JTVLNUP2UR74S4KJYKT4HQC","Solve day 1 for 2020"]],"deps":["B527MN663VOX7PY6BCLAAU62WDPTI4JTVLNUP2UR74S4KJYKT4HQC"],"known":[]},"hunks":[{"FileAdd":{"meta":{"basename":"day12.rs","metadata":0},"context":[{"change":2,"pos":17}],"contents":[{"Add":"use std::str::FromStr;"},{"Add":""},{"Add":"#[derive(Clone,Copy,PartialEq,Eq)]"},{"Add":"enum Cardinal {"},{"Add":" N,"},{"Add":" S,"},{"Add":" E,"},{"Add":" W"},{"Add":"}"},{"Add":""},{"Add":"#[derive(Clone,Copy,PartialEq,Eq)]"},{"Add":"enum Direction {"},{"Add":" C(Cardinal,u16),"},{"Add":" T(i8),"},{"Add":" F(u16),"},{"Add":"}"},{"Add":""},{"Add":"#[derive(Debug)]"},{"Add":"enum ParseDirectionError {"},{"Add":" I(std::num::ParseIntError),"},{"Add":" D(char),"},{"Add":" Z,"},{"Add":"}"},{"Add":""},{"Add":"impl From for ParseDirectionError {"},{"Add":" fn from(src: std::num::ParseIntError) -> Self {"},{"Add":" Self::I(src)"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"impl std::fmt::Display for ParseDirectionError {"},{"Add":" fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {"},{"Add":" match self {"},{"Add":" ParseDirectionError::I(e) => e.fmt(f),"},{"Add":" ParseDirectionError::D(c) => write!(f, \"Unrecognised direction code: {}\", c),"},{"Add":" ParseDirectionError::Z => write!(f, \"Empty string\"),"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"impl FromStr for Direction {"},{"Add":" type Err = ParseDirectionError;"},{"Add":" fn from_str(s: &str) -> Result {"},{"Add":" if s.len() == 0 {"},{"Add":" Err(Self::Err::Z)?;"},{"Add":" };"},{"Add":" let (c,ns) = s.split_at(1);"},{"Add":" match c {"},{"Add":" \"N\" => {"},{"Add":" let d = ns.parse::()?;"},{"Add":" Ok(Direction::C(Cardinal::N,d))"},{"Add":" },"},{"Add":" \"S\" => {"},{"Add":" let d = ns.parse::()?;"},{"Add":" Ok(Direction::C(Cardinal::S,d))"},{"Add":" },"},{"Add":" \"E\" => {"},{"Add":" let d = ns.parse::()?;"},{"Add":" Ok(Direction::C(Cardinal::E,d))"},{"Add":" },"},{"Add":" \"W\" => {"},{"Add":" let d = ns.parse::()?;"},{"Add":" Ok(Direction::C(Cardinal::W,d))"},{"Add":" },"},{"Add":" \"L\" => {"},{"Add":" let d = ns.parse::()?;"},{"Add":" Ok(Direction::T(((4 - (d / 90)) % 4) as i8))"},{"Add":" },"},{"Add":" \"R\" => {"},{"Add":" let d = ns.parse::()?;"},{"Add":" Ok(Direction::T(((d / 90) % 4) as i8))"},{"Add":" },"},{"Add":" \"F\" => {"},{"Add":" let d = ns.parse::()?;"},{"Add":" Ok(Direction::F(d))"},{"Add":" },"},{"Add":" _ => Err(ParseDirectionError::D(c.chars().next().unwrap())),"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"#[derive(Clone,Copy,PartialEq,Eq)]"},{"Add":"struct Ship {"},{"Add":" x: i32,"},{"Add":" y: i32,"},{"Add":" bearing: Cardinal,"},{"Add":" waypoint_x: i32,"},{"Add":" waypoint_y: i32,"},{"Add":"}"},{"Add":""},{"Add":"impl Ship {"},{"Add":" fn new() -> Self {"},{"Add":" Ship {x: 0, y: 0, bearing: Cardinal::E, waypoint_x: 10, waypoint_y: -1 }"},{"Add":" }"},{"Add":""},{"Add":" fn step(&mut self, dir: Direction, revised: bool) {"},{"Add":" if revised {"},{"Add":" match dir {"},{"Add":" Direction::C(c,d) => match c {"},{"Add":" Cardinal::N => { self.waypoint_y -= d as i32; },"},{"Add":" Cardinal::S => { self.waypoint_y += d as i32; },"},{"Add":" Cardinal::E => { self.waypoint_x += d as i32; },"},{"Add":" Cardinal::W => { self.waypoint_x -= d as i32; },"},{"Add":" },"},{"Add":" Direction::T(qt) => match qt % 4 {"},{"Add":" 0 => {},"},{"Add":" 1 => {"},{"Add":" let (x,y) = (self.waypoint_x, self.waypoint_y);"},{"Add":" self.waypoint_x = -y;"},{"Add":" self.waypoint_y = x;"},{"Add":" },"},{"Add":" 2 => {"},{"Add":" let (x,y) = (self.waypoint_x, self.waypoint_y);"},{"Add":" self.waypoint_x = -x;"},{"Add":" self.waypoint_y = -y;"},{"Add":" },"},{"Add":" 3 => {"},{"Add":" let (x,y) = (self.waypoint_x, self.waypoint_y);"},{"Add":" self.waypoint_x = y;"},{"Add":" self.waypoint_y = -x;"},{"Add":" },"},{"Add":" _ => panic!(\"_ % 4 >= 4 !???\"),"},{"Add":" },"},{"Add":" Direction::F(d) => {"},{"Add":" self.x += self.waypoint_x * d as i32;"},{"Add":" self.y += self.waypoint_y * d as i32;"},{"Add":" },"},{"Add":" }"},{"Add":" } else {"},{"Add":" match dir {"},{"Add":" Direction::C(c,d) => match c {"},{"Add":" Cardinal::N => { self.y -= d as i32; },"},{"Add":" Cardinal::S => { self.y += d as i32; },"},{"Add":" Cardinal::E => { self.x += d as i32; },"},{"Add":" Cardinal::W => { self.x -= d as i32; },"},{"Add":" },"},{"Add":" Direction::T(qt) => {"},{"Add":" let sqt: i8 = match self.bearing {"},{"Add":" Cardinal::N => 8,"},{"Add":" Cardinal::S => 10,"},{"Add":" Cardinal::E => 9,"},{"Add":" Cardinal::W => 11,"},{"Add":" };"},{"Add":" self.bearing = match (sqt + qt) % 4 {"},{"Add":" 0 => Cardinal::N,"},{"Add":" 1 => Cardinal::E,"},{"Add":" 2 => Cardinal::S,"},{"Add":" 3 => Cardinal::W,"},{"Add":" _ => panic!(\"_ % 4 >= 4 !???\"),"},{"Add":" };"},{"Add":" },"},{"Add":" Direction::F(d) => self.step(Direction::C(self.bearing, d), false),"},{"Add":" }"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"fn main() {"},{"Add":" use std::io::BufRead;"},{"Add":" let args: Vec<_> = std::env::args().collect();"},{"Add":" let mut ship = Ship::new();"},{"Add":" let file = std::io::BufReader::new(std::fs::File::open(>::as_ref(&args[1])).unwrap());"},{"Add":" let revised = match args[2].as_ref() {"},{"Add":" \"1\" => false,"},{"Add":" \"2\" => true,"},{"Add":" _ => panic!(\"Version number (1 or 2) expected\")"},{"Add":" };"},{"Add":" for line in file.lines() {"},{"Add":" ship.step(line.unwrap().parse().unwrap(), revised);"},{"Add":" }"},{"Add":" println!(\"{}\", ship.x.abs() + ship.y.abs());"},{"Add":"}"}]}}],"owner":"quickdudley","repo":"adventofcode","token":"d/W4/CBkt/KRCEjTNpOEMtZQfRLLOTaXnLvftnc6pkE=","login":null}

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