Add sound when match result is shown (closes #120).

field/arena.go

@@ -361,6 +361,25 @@ func (arena *Arena) StartTimeout(durationSec int) error {
 	return nil
 }
 
+// Updates the audience display screen.
+func (arena *Arena) SetAudienceDisplayMode(mode string) {
+	if arena.AudienceDisplayMode != mode {
+		arena.AudienceDisplayMode = mode
+		arena.AudienceDisplayModeNotifier.Notify()
+		if mode == "score" {
+			arena.playSound("match_result")
+		}
+	}
+}
+
+// Updates the alliance station display screen.
+func (arena *Arena) SetAllianceStationDisplayMode(mode string) {
+	if arena.AllianceStationDisplayMode != mode {
+		arena.AllianceStationDisplayMode = mode
+		arena.AllianceStationDisplayModeNotifier.Notify()
+	}
+}
+
 // Returns the fractional number of seconds since the start of the match.
 func (arena *Arena) MatchTimeSec() float64 {
 	if arena.MatchState == PreMatch || arena.MatchState == StartMatch || arena.MatchState == PostMatch {

game/match_sounds.go

@@ -69,5 +69,11 @@ func UpdateMatchSounds() {
 			-1,
 			false,
 		},
+		{
+			"match_result",
+			"wav",
+			-1,
+			false,
+		},
 	}
 }

web/match_play.go

@@ -283,22 +283,20 @@ func (web *Web) matchPlayWebsocketHandler(w http.ResponseWriter, r *http.Request
 			}
 			continue // Skip sending the status update, as the client is about to terminate and reload.
 		case "setAudienceDisplay":
-			screen, ok := data.(string)
+			mode, ok := data.(string)
 			if !ok {
 				ws.WriteError(fmt.Sprintf("Failed to parse '%s' message.", messageType))
 				continue
 			}
-			web.arena.AudienceDisplayMode = screen
-			web.arena.AudienceDisplayModeNotifier.Notify()
+			web.arena.SetAudienceDisplayMode(mode)
 			continue
 		case "setAllianceStationDisplay":
-			screen, ok := data.(string)
+			mode, ok := data.(string)
 			if !ok {
 				ws.WriteError(fmt.Sprintf("Failed to parse '%s' message.", messageType))
 				continue
 			}
-			web.arena.AllianceStationDisplayMode = screen
-			web.arena.AllianceStationDisplayModeNotifier.Notify()
+			web.arena.SetAllianceStationDisplayMode(mode)
 			continue
 		case "startTimeout":
 			durationSec, ok := data.(float64)