[rs] Get rid of anyhow

rs/src/main.rs

@@ -2,7 +2,7 @@ mod y2022;
 
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
-use std::{fmt, fs};
+use std::{fmt, fs, io};
 
 use clap::Parser;
 
@@ -47,7 +47,7 @@ struct Args {
     files: Vec<PathBuf>,
 }
 
-fn main() -> anyhow::Result<()> {
+fn main() -> io::Result<()> {
     let args = Args::parse();
 
     if args.files.is_empty() {
@@ -72,9 +72,9 @@ fn main() -> anyhow::Result<()> {
         println!("### Solving day {day}");
         let input = fs::read_to_string(file)?;
         match day {
-            Day::Y2022D01 => y2022::d01::solve(input)?,
-            Day::Y2022D02 => y2022::d02::solve(input)?,
-            Day::Y2022D03 => y2022::d03::solve(input)?,
+            Day::Y2022D01 => y2022::d01::solve(input),
+            Day::Y2022D02 => y2022::d02::solve(input),
+            Day::Y2022D03 => y2022::d03::solve(input),
         }
     }
 

rs/src/y2022/d01.rs

@@ -1,4 +1,4 @@
-pub fn solve(input: String) -> anyhow::Result<()> {
+pub fn solve(input: String) {
     let mut elves = input
         .trim()
         .split("\n\n")
@@ -18,6 +18,4 @@ pub fn solve(input: String) -> anyhow::Result<()> {
     // Part 2
     let top_three = elves.iter().rev().take(3).sum::<u32>();
     println!("Part 2: {top_three}");
-
-    Ok(())
 }

rs/src/y2022/d02.rs

@@ -70,7 +70,7 @@ fn read_round(line: &str) -> (Choice, Choice, Outcome) {
     (l, rc, ro)
 }
 
-pub fn solve(input: String) -> anyhow::Result<()> {
+pub fn solve(input: String) {
     let matches = input
         .lines()
         .map(|l| read_round(l.trim()))
@@ -89,6 +89,4 @@ pub fn solve(input: String) -> anyhow::Result<()> {
         .map(|(l, _, r)| r.against(*l).score() + r.score())
         .sum::<u32>();
     println!("Part 2: {score}");
-
-    Ok(())
 }

rs/src/y2022/d03.rs

@@ -15,7 +15,7 @@ fn highest_score(i: u64) -> u32 {
     64 - i.leading_zeros()
 }
 
-pub fn solve(input: String) -> anyhow::Result<()> {
+pub fn solve(input: String) {
     let backpacks = input.lines().map(|l| l.trim()).collect::<Vec<_>>();
 
     // Part 1
@@ -40,6 +40,4 @@ pub fn solve(input: String) -> anyhow::Result<()> {
         .map(highest_score)
         .sum::<u32>();
     println!("Part 2: {score}");
-
-    Ok(())
 }