From 37c7630a6cfd289290829b0b4ac84953bec3b382 Mon Sep 17 00:00:00 2001
From: Thanh Le <lenguyenthanh@hotmail.com>
Date: Tue, 10 Oct 2023 20:03:25 +0200
Subject: [PATCH] Remove head.option

---
 src/main/scala/Replay.scala | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/main/scala/Replay.scala b/src/main/scala/Replay.scala
index 29386a139..14387e3ca 100644
--- a/src/main/scala/Replay.scala
+++ b/src/main/scala/Replay.scala
@@ -54,16 +54,17 @@ object Replay:
     val init       = makeGame(variant, initialFen.some)
     val emptyGames = List.empty[(Game, Uci.WithSan)]
     sans
-      .foldM(emptyGames):
-        case (games, str) =>
+      .foldM((init, emptyGames)):
+        case ((head, games), str) =>
           Parser
             .sanOnly(str)
             .flatMap: san =>
-              val game = games.headOption.fold(init)(_._1)
-              san(game.situation)
-                .map(m => (m.applyGame(game), Uci.WithSan(m.toUci, str)) :: games)
+              san(head.situation)
+                .map: move =>
+                  val newGame = move.applyGame(head)
+                  (newGame, (newGame, Uci.WithSan(move.toUci, str)) :: games)
             .leftMap(err => (init, games.reverse, err.some))
-      .map(gs => (init, gs.reverse, none))
+      .map(gs => (init, gs._2.reverse, none))
       .merge
 
   private def computeSituations[M](