day 6 turned into testable and rfactored

Cargo.lock

@@ -79,6 +79,9 @@ dependencies = [
 [[package]]
 name = "day6"
 version = "2022.0.0"
+dependencies = [
+ "itertools",
+]
 
 [[package]]
 name = "day7"

day6/Cargo.toml

@@ -8,3 +8,4 @@ repository.workspace = true
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+itertools.workspace = true

day6/src/main.rs

@@ -1,40 +1,70 @@
 #![warn(clippy::all, clippy::pedantic)]
 
-use std::collections::HashMap;
+use std::fs;
-use std::fs::File;
-use std::io::{prelude::*, BufReader};
 
-fn main() -> std::io::Result<()> {
+use itertools::Itertools;
-    //Read in file
-    let file = File::open("input")?;
-    let reader = BufReader::new(file);
 
-    reader.lines().enumerate().for_each(|(line_no, line)| {
+fn work(input: &str, count: usize) -> String {
-        let line = line.unwrap();
+    let array = input.as_bytes();
-        'checker: for i in 4..line.len() {
+    for x in count..array.len() {
-            let window = line[(i - 4)..i].to_string();
+        if array
-            let mut holder: HashMap<char, bool> = HashMap::new();
+            .iter()
-            for c in window.chars() {
+            .enumerate()
-                if holder.contains_key(&c) {
+            .filter_map(|(pos, val)| {
-                    continue 'checker;
+                if pos >= x - count && pos < x {
+                    Some(val)
+                } else {
+                    None
                 }
-                holder.insert(c, true);
+            })
+            .unique()
+            .count()
+            == count
+        {
+            return x.to_string();
         }
-            println!("Part 1: line: {line_no} marker at: {i}");
-            break;
     }
-        'checker: for i in 14..line.len() {
+    panic!("stuff should have been gotten {input}")
-            let window = line[(i - 14)..i].to_string();
+}
-            let mut holder: HashMap<char, bool> = HashMap::new();
+
-            for c in window.chars() {
+fn part1(input: &str) -> String {
-                if holder.contains_key(&c) {
+    work(input, 4)
-                    continue 'checker;
+}
-                }
+
-                holder.insert(c, true);
+fn part2(input: &str) -> String {
-            }
+    work(input, 14)
-            println!("Part 2: line: {line_no} marker at: {i}");
+}
-            break;
+
-        }
+fn main() -> () {
-    });
+    //Read in file
-    Ok(())
+    let file = fs::read_to_string("input").unwrap();
+
+    println!("Part 1: {}", part1(&file));
+    println!("Part 2: {}", part2(&file));
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    const INPUT: &[(&str, &str, &str)] = &[
+        ("mjqjpqmgbljsphdztnvjfqwrcgsmlb", "7", "19"),
+        ("bvwbjplbgvbhsrlpgdmjqwftvncz", "5", "23"),
+        ("nppdvjthqldpwncqszvftbrmjlhg", "6", "23"),
+        ("nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg", "10", "29"),
+        ("zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw", "11", "26"),
+    ];
+
+    #[test]
+    fn part1_works() {
+        INPUT
+            .iter()
+            .for_each(|(test, ans1, _)| assert_eq!(part1(*test), *ans1))
+    }
+
+    #[test]
+    fn part2_works() {
+        INPUT
+            .iter()
+            .for_each(|(test, _, ans2)| assert_eq!(part2(*test), *ans2))
+    }
 }