Finished day 2

src/day2.rs

@@ -0,0 +1,53 @@
+struct Position {
+    pub x: i64,
+    pub y: i64,
+    pub z: i64,
+}
+
+impl std::default::Default for Position {
+    fn default() -> Self {
+        Self { x: 0, y: 0, z: 0 }
+    }
+}
+
+pub fn part1(input: String) {
+    let mut pos = Position::default();
+
+    for line in input.lines() {
+        let mut command = line.split(' ');
+        let dir = command.next().unwrap();
+        let distance = command.next().unwrap().parse::<i64>().unwrap();
+
+        match dir {
+            "forward" => pos.x += distance,
+            "up" => pos.z += distance,
+            "down" => pos.z -= distance,
+            _ => panic!("Invalid input!"),
+        }
+    }
+
+    println!("{}", pos.x * -pos.z);
+}
+
+pub fn part2(input: String) {
+    let mut pos = Position::default();
+    let mut attitude = 0i64;
+
+    for line in input.lines() {
+        let mut command = line.split(' ');
+        let dir = command.next().unwrap();
+        let distance = command.next().unwrap().parse::<i64>().unwrap();
+
+        match dir {
+            "forward" => {
+                pos.x += distance;
+                pos.z += distance * attitude;
+            }
+            "up" => attitude += distance,
+            "down" => attitude -= distance,
+            _ => panic!("Invalid input!"),
+        }
+    }
+
+    println!("{}", pos.x * -pos.z);
+}

src/main.rs

@@ -1,6 +1,7 @@
 use clap::{App, Arg};
 
 mod day1;
+mod day2;
 
 fn main() {
     let matches = App::new("AOC 2021 Code")
@@ -30,7 +31,7 @@ fn main() {
     let part = matches.value_of("part").unwrap_or("1");
     let part = str::parse::<u8>(part).expect("Invalid part provided (1 or 2 expected)");
 
-    let input = read_input(day, part).unwrap();
+    let input = read_input(day).unwrap();
 
     match day {
         1 => match part {
@@ -38,15 +39,17 @@ fn main() {
             2 => day1::day1_p2(input),
             _ => (),
         },
+        2 => match part {
+            1 => day2::part1(input),
+            2 => day2::part2(input),
+            _ => (),
+        },
         _ => println!("Day {} not completed yet!", day),
     }
 }
 
 // TODO do the inputs ever change inside of a day?
 /// Read inputs into a string
-fn read_input(day: u8, part: u8) -> std::io::Result<String> {
-    std::fs::read_to_string(format!(
-        "inputs/day{}p{}",
-        day, part
-    ))
+fn read_input(day: u8) -> std::io::Result<String> {
+    std::fs::read_to_string(format!("inputs/day{}", day))
 }