Split into parts and learn about borrow checking smore

src/bin/p02.rs

@@ -2,7 +2,7 @@ use num_derive::FromPrimitive;
 use num_traits::FromPrimitive;
 use std::cmp::Ordering;
 use std::fs;
-use std::io::{self, BufRead};
+use std::io::{self, BufRead, Seek, Read};
 use std::str::FromStr;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, FromPrimitive)]
@@ -92,8 +92,47 @@ impl PlayStrat {
 fn main() {
     let filename = "etc/p02.txt";
     let file = fs::File::open(filename).expect("Can't open file");
-    let lines = io::BufReader::new(file).lines();
+    let mut reader = io::BufReader::new(file);
 
+    println!("PART ONE ---------------");
+    part1(reader.by_ref().lines());
+    reader.rewind().expect("Can't rewind");
+
+    println!("\n PART TWO ---------------");
+    part2(reader.by_ref().lines());
+}
+
+fn part1(lines: std::io::Lines<&mut io::BufReader<fs::File>>) {
+    let mut total_score: u32 = 0;
+    for l in lines {
+        let line = l.expect("Can't read line.");
+        let mut split = line.split_ascii_whitespace();
+        let theirs = split
+            .next()
+            .expect("Want two items per line")
+            .parse::<Rps>()
+            .expect("Can't get their move");
+        let mine = split
+            .next()
+            .expect("Want two items per line")
+            .parse::<Rps>()
+            .expect("Can't get my strategy");
+
+        let score = mine.score(theirs);
+        total_score += score;
+        println!(
+            "Line \"{}\" - Theirs: {:?}, Mine: {:?}, score {}",
+            line,
+            theirs,
+            mine,
+            score,
+        );
+    }
+
+    println!("Total score is {}", total_score);
+}
+
+fn part2(lines: std::io::Lines<&mut io::BufReader<fs::File>>) {
     let mut total_score: u32 = 0;
     for l in lines {
         let line = l.expect("Can't read line.");
@@ -114,14 +153,12 @@ fn main() {
         let score = mine.score(theirs);
         total_score += score;
         println!(
-            "Line \"{}\" - Theirs: {:?}, Strat: {:?}, Mine: {:?} ({:?}), score {} (so far {})",
+            "Line \"{}\" - Theirs: {:?}, Strat: {:?}, Mine: {:?}, score {}",
             line,
             theirs,
             strat,
             mine,
-            mine.cmp(&theirs),
             score,
-            total_score,
         );
     }