Add TurnInPlay::suit() to identify the lead suit

1 files changed, 12 insertions, 0 deletions

diff --git a/webapp/src/bridge_engine.rs b/webapp/src/bridge_engine.rs
index 6d13f50..a411c1c 100644
--- a/webapp/src/bridge_engine.rs
+++ b/webapp/src/bridge_engine.rs
@@ -79,6 +79,10 @@ impl TurnInPlay {
         }
     }
 
+    pub fn suit(&self) -> Option<Suit> {
+        self.trick.cards_played.iter().next().map(|&Card(suit, _)| suit)
+    }
+
     pub fn leader(&self) -> Player {
         self.trick.leader
     }
@@ -631,6 +635,14 @@ mod tests {
         );
     }
 
+    #[test]
+    fn lead_suit() {
+        let turn = TurnInPlay::new(Player::South);
+        assert_eq!(turn.suit(), None);
+        let turn = as_turn(turn.play("♣4".parse().unwrap()));
+        assert_eq!(turn.suit(), Some("♣".parse().unwrap()));
+    }
+
     fn mkcard(s: &str) -> Card {
         Card::from_str(s).unwrap()
     }