+ }))
+}
+
+/// When available, make plays that grant momentum.
+#[must_use]
+pub fn momentum_player(mut fallback: Player) -> Player {
+ Player(Box::new(move |game: &Game| -> Play {
+ match (&game.phase, game.discard.top().and_then(Card::suit)) {
+ (Phase::Play, Some(suit)) => {
+ match game.current_player_hand().filter_by_suit(suit).random() {
+ Some(card) => Play::Play(*card),
+ _ => fallback.0(game),
+ }
+ }
+ _ => fallback.0(game),
+ }
+ }))