day02 finished

src/days/mod.rs

@@ -1,6 +1,31 @@
 mod day01;
-pub mod day_provider;
+mod day02;
 mod template;
 
 pub use template::DayTrait;
 pub use template::ResultType;
+
+pub mod day_provider {
+    use super::*;
+    use thiserror::Error;
+
+    const MAX_DAY: usize = 2;
+
+    pub fn get_day(day_num: usize) -> Result<Box<dyn DayTrait>, ProviderError> {
+        match day_num {
+            1 => Ok(Box::new(day01::Day)),
+            2 => Ok(Box::new(day02::Day)),
+            _ => Err(ProviderError::InvalidNumber(day_num)),
+        }
+    }
+
+    pub fn get_all_days() -> impl Iterator<Item = Box<dyn DayTrait>> {
+        (1..=MAX_DAY).map(|day_num| get_day(day_num).expect("Must never happen"))
+    }
+
+    #[derive(Debug, Error)]
+    pub enum ProviderError {
+        #[error("Not a valid day number: {0}")]
+        InvalidNumber(usize),
+    }
+}