Macro-ify benches and unify days list to one file

Also update README with new options.

README.md

@@ -6,13 +6,17 @@ Rusty and over-engineered edition.
 
 By request of AoC creator, I haven't included the input files (e.g. src/input/day01.txt). Log into the Advent of Code site and save the inputs there to the src/input/ folder.
 
-Then to run: `cargo run`.
+To run all days: `cargo run`.
+
+To run a specific day and/or part: `cargo run -- --day 1 --part 1`.
 
 To run in super-fast prod mode: `cargo run --release`.
 
 To run with debug logs enabled: `RUST_LOG=debug cargo run`.
 
-To run the tests against included test input files: `RUST_LOG=debug cargo test -- --no-capture`.
+To run all the tests against included test input files: `RUST_LOG=debug cargo test -- --no-capture`.
+
+To run the tests for a specific day and/or part: `RUST_LOG=debug cargo test day01::test::test_part1 -- --no-capture`.
 
 ## Benchmarks
 

benches/aoc.rs

@@ -1,16 +1,23 @@
-use aoc::day01;
-use aoc::day02;
 use criterion::{Criterion, criterion_group, criterion_main};
 
-fn day01_benchmark(c: &mut Criterion) {
-    c.bench_function("day01 part1", |b| b.iter(|| day01::part1(day01::INPUT)));
-    c.bench_function("day01 part2", |b| b.iter(|| day01::part2(day01::INPUT)));
-}
+macro_rules! bench_days {
+    ($($day_num:literal => $day_mod:ident),* $(,)?) => {
+        $(
+            use aoc::$day_mod;
 
-fn day02_benchmark(c: &mut Criterion) {
-    c.bench_function("day02 part1", |b| b.iter(|| day02::part1(day02::INPUT)));
-    c.bench_function("day02 part2", |b| b.iter(|| day02::part2(day02::INPUT)));
+            fn $day_mod(c: &mut Criterion) {
+                c.bench_function(concat!(stringify!($day_mod), " part1"), |b| {
+                    b.iter(|| $day_mod::part1($day_mod::INPUT))
+                });
+                c.bench_function(concat!(stringify!($day_mod), " part2"), |b| {
+                    b.iter(|| $day_mod::part2($day_mod::INPUT))
+                });
             }
+        )*
 
-criterion_group!(benches, day01_benchmark, day02_benchmark);
+        criterion_group!(benches, $($day_mod),*);
         criterion_main!(benches);
+    };
+}
+
+aoc::all_days!(bench_days);

src/days.rs

@@ -0,0 +1,12 @@
+// Single source of truth for all implemented days
+// Add new days here and they'll automatically be available in both the runner and benchmarks
+
+#[macro_export]
+macro_rules! all_days {
+    ($macro_name:path) => {
+        $macro_name! {
+            1 => day01,
+            2 => day02,
+        }
+    };
+}

src/lib.rs

@@ -1,2 +1,3 @@
 pub mod day01;
 pub mod day02;
+pub mod days;

src/main.rs

@@ -1,7 +1,7 @@
+mod days;
 mod runner;
 
-pub mod day01;
-pub mod day02;
+use aoc::{day01, day02};
 
 use clap::Parser;
 use color_eyre::Result;
@@ -24,10 +24,7 @@ struct Args {
     part: Option<u8>,
 }
 
-runner::days! {
-    1 => day01,
-    2 => day02,
-}
+all_days!(runner::days);
 
 fn main() -> Result<()> {
     color_eyre::install()?;