Apply clippy fixes

day01-gen-problem/src/main.rs

@@ -8,8 +8,7 @@ const MAX_CALORY: usize = 30_000;
 
 fn main() {
     let outfile = ::std::env::args()
-        .skip(1)
-        .next()
+        .nth(1)
         .expect("Output file as first parameter");
     let mut outfile = BufWriter::new(File::create(outfile).expect("Can write outfile"));
     let mut rng = rand::thread_rng();

day01/src/main.rs

@@ -60,8 +60,7 @@ impl TopThree {
 
 fn main() {
     let file = ::std::env::args()
-        .skip(1)
-        .next()
+        .nth(1)
         .unwrap_or_else(|| String::from("./input"));
     let file = BufReader::new(File::open(file).expect("Input file not found"));
     let TopCal { top, .. } = file

day02-gen-problem/src/main.rs

@@ -6,8 +6,7 @@ const LINE_COUNT: usize = 20_000_000;
 
 fn main() {
     let outfile = ::std::env::args()
-        .skip(1)
-        .next()
+        .nth(1)
         .expect("Output file as first parameter");
     let mut outfile = BufWriter::new(File::create(outfile).expect("Can write outfile"));
     let mut rng = rand::thread_rng();

day02/src/main.rs

@@ -25,9 +25,9 @@ fn calculate_game_score(line: String) -> usize {
         // Rock -> 1
         // Paper -> 2
         // Scissor -> 3
-        (0, 0) => 3 + 0,
-        (1, 0) => 1 + 0,
-        (2, 0) => 2 + 0,
+        (0, 0) => 3,
+        (1, 0) => 1,
+        (2, 0) => 2,
         (0, 1) => 1 + 3,
         (1, 1) => 2 + 3,
         (2, 1) => 3 + 3,
@@ -40,8 +40,7 @@ fn calculate_game_score(line: String) -> usize {
 
 fn main() {
     let file = ::std::env::args()
-        .skip(1)
-        .next()
+        .nth(1)
         .unwrap_or_else(|| String::from("./input"));
     let file = BufReader::new(File::open(file).expect("Input file not found"));
     let sum: usize = file

day03-gen-problem/src/main.rs

@@ -20,7 +20,7 @@ use std::{
 };
 
 lazy_static! {
-    static ref CHARS: Vec<char> = ('a'..'z').chain('A'..'Z').collect();
+    static ref CHARS: Vec<char> = ('a'..='z').chain('A'..='Z').collect();
     static ref ARGS: Args = Args::parse();
 }
 
@@ -44,7 +44,7 @@ impl Args {
 }
 
 fn replace_rand<I>(rng: &mut rand::rngs::SmallRng, list: &mut Vec<I>, item: I) {
-    debug_assert!(list.len() > 0);
+    debug_assert!(!list.is_empty());
     let idx = rng.gen_range(0..list.len());
     list[idx] = item;
 }
@@ -114,7 +114,6 @@ fn main() {
     let mut rng = SmallRng::from_rng(rand::thread_rng()).expect("Init rng");
     (0..ARGS.elf_groups)
         .flat_map(|_| gen_triple(&mut rng))
-        .inspect(|line| debug_assert!(line.len() % 2 == 0))
         .for_each(|line| writeln!(outfile, "{line}").expect("Writing works"));
     outfile.flush().expect("Flushing works");
 }

day03/src/main.rs

@@ -32,7 +32,7 @@ impl IsTrue for Assert<true> {}
 fn parse_chars<S: AsRef<str>>(line: S) -> Bitmask {
     line.as_ref()
         .as_bytes()
-        .into_iter()
+        .iter()
         .map(Bitmask::from_alpha)
         .reduce(std::ops::BitOr::bitor)
         .unwrap()

day04/src/main.rs

@@ -22,10 +22,10 @@ struct Counter {
 fn parse_line<S: AsRef<str>>(line: S) -> [RangeInclusive<usize>; 2] {
     let (first, second) = line
         .as_ref()
-        .split_once(",")
+        .split_once(',')
         .expect("A comma in every line");
-    let (first_from, first_to) = first.split_once("-").expect("A range with a dash");
-    let (second_from, second_to) = second.split_once("-").expect("A range with a dash");
+    let (first_from, first_to) = first.split_once('-').expect("A range with a dash");
+    let (second_from, second_to) = second.split_once('-').expect("A range with a dash");
     [
         first_from.parse().unwrap()..=first_to.parse().unwrap(),
         second_from.parse().unwrap()..=second_to.parse().unwrap(),

day05/src/main.rs

@@ -84,7 +84,7 @@ impl Port {
         self.columns[mv.to].extend(moved);
     }
     /// Read the letters on the top row of the container stacks.
-    fn to_top_row_string(self) -> String {
+    fn into_top_row_string(self) -> String {
         let bytes: Vec<u8> = self
             .columns
             .into_iter()
@@ -105,7 +105,7 @@ where
         .map(|line| line.parse())
         .map(Result::unwrap)
         .for_each(|mv| port.apply(mv, solve == SolvePuzzle::First));
-    port.to_top_row_string()
+    port.into_top_row_string()
 }
 
 fn main() {

day07/src/main.rs

@@ -43,12 +43,9 @@ impl<Ext: CollectorExt> Collector<Ext> {
             self.change_director_root()
         } else if line == "$ cd .." {
             self.change_directory_up()
-        } else if line.starts_with("$ cd ") {
-            let target = &line[5..];
+        } else if let Some(target) = line.strip_prefix("$ cd ") {
             self.change_directory_to(target)
-        } else if line == "$ ls" {
-            // Just ignore
-        } else if line.starts_with("dir ") {
+        } else if line == "$ ls" || line.starts_with("dir ") {
             // Nothing to do
         } else {
             let (size, _label) = line.split_once(' ').expect("A dir list entry");

day08/src/main.rs

@@ -166,7 +166,7 @@ fn print_scenic_view<R: BufRead>(reader: R) {
         .copied()
         .unwrap_or_default()
         + 1;
-    let sup = sup.checked_ilog2().unwrap_or_default();
+    let _sup = sup.checked_ilog2().unwrap_or_default();
     for row_idx in 0..height {
         let output: String = (0..width)
             .map(|col_idx| {
@@ -177,7 +177,7 @@ fn print_scenic_view<R: BufRead>(reader: R) {
                     visible_trees[row_idx][col_idx],
                 )
             })
-            .map(|(col_idx, tree, score, is_visible)| {
+            .map(|(col_idx, tree, _score, is_visible)| {
                 // let col = ::colorous::WARM.eval_rational(
                 //     score.checked_ilog2().unwrap_or_default() as usize,
                 //     sup as usize,