add more statistics to regression test

xtask/src/main.rs

@@ -1,4 +1,5 @@
 use std::{
+    cmp::Ordering,
     env,
     net::TcpStream,
     path::{Path, PathBuf},
@@ -156,15 +157,29 @@ fn regression() -> Result<(), DynError> {
     let res = try_regression();
 
     snake.kill().and(prod.kill())?;
-    let (won, games) = res?;
+    let (won, draw, loose) = res?;
+    let games = won + draw + loose;
     println!(
         "\nThe local snake has won {won}/{games} games ({}%)",
         (won + games / 200) * 100 / games
     );
+    println!(
+        "The local snake has drawn {draw}/{games} games ({}%)",
+        (draw + games / 200) * 100 / games
+    );
+    println!(
+        "The local snake has lost {loose}/{games} games ({}%)",
+        (loose + games / 200) * 100 / games
+    );
+    match won.cmp(&loose) {
+        Ordering::Less => println!("The local nake is worse than the production"),
+        Ordering::Equal => println!("The local snake is equivalent to the production"),
+        Ordering::Greater => println!("The local snake is better than the production"),
+    }
     Ok(())
 }
 
-fn try_regression() -> Result<(usize, usize), DynError> {
+fn try_regression() -> Result<(usize, usize, usize), DynError> {
     const GAMES: usize = 100;
     // limit the parallelism
     rayon::ThreadPoolBuilder::new()
@@ -172,9 +187,9 @@ fn try_regression() -> Result<(usize, usize), DynError> {
         .build_global()
         .unwrap();
 
-    let won_count = (0..GAMES)
+    let stats = (0..GAMES)
         .into_par_iter()
-        .map(|_| -> Option<usize> {
+        .flat_map(|_| {
             eprint!(".");
             let game = Command::new("./battlesnake-cli")
                 .current_dir(project_root())
@@ -203,15 +218,28 @@ fn try_regression() -> Result<(usize, usize), DynError> {
                 None
             } else {
                 const WIN_PHRASE: &[u8] = b"local was the winner.\n";
-                let won = &game.stderr[(game.stderr.len() - WIN_PHRASE.len())..game.stderr.len()]
-                    == WIN_PHRASE;
-                Some(usize::from(won))
+                const LOOSE_PHRASE: &[u8] = b"production was the winner.\n";
+                if &game.stderr[(game.stderr.len() - WIN_PHRASE.len())..game.stderr.len()]
+                    == WIN_PHRASE
+                {
+                    Some((1, 0, 0))
+                } else if &game.stderr[(game.stderr.len() - LOOSE_PHRASE.len())..game.stderr.len()]
+                    == LOOSE_PHRASE
+                {
+                    Some((0, 0, 1))
+                } else {
+                    Some((0, 1, 0))
+                }
             }
         })
-        .flatten()
-        .sum();
+        .reduce(
+            || (0, 0, 0),
+            |(sum_win, sum_draw, sum_loose), (win, draw, loose)| {
+                (sum_win + win, sum_draw + draw, sum_loose + loose)
+            },
+        );
 
-    Ok((won_count, GAMES))
+    Ok(stats)
 }
 
 fn run_snake(port: u16, log: Option<&str>) -> Result<Child, DynError> {