Initial 2021 runner

2021/src/lib.rs

@@ -0,0 +1,29 @@
+use std::io::Read;
+
+mod day01;
+
+pub trait Solution {
+    fn part1(&mut self, input: &mut dyn Read) -> String;
+
+    fn part2(&mut self, _input: &mut dyn Read) -> String {
+        unimplemented!("Still working on part 1");
+    }
+}
+
+pub fn get_implementation(day: usize) -> Box<dyn Solution> {
+    match day {
+        1 => Box::new(day01::Day01::default()),
+        _ => panic!("Unsupported day {}", day),
+    }
+}
+
+#[cfg(test)]
+fn test_implementation(mut day: impl Solution, part: u8, mut input: &[u8], answer: impl ToString) {
+    let result = match part {
+        1 => day.part1(&mut input),
+        2 => day.part2(&mut input),
+        _ => panic!("Invalid part: {}", part),
+    };
+
+    assert_eq!(answer.to_string(), result);
+}