Make ui optional for gobot

cmd/gobot/main.go

@@ -27,6 +27,7 @@ var addr = flag.String("addr", "ws://localhost:8666", "server hostname")
 var botname = flag.String("name", "gobot", "the name that other players will see")
 var forceJSON = flag.Bool("json", false, "force json encoding")
 var botType = flag.String("bot", "simple", "which Bot [fraserbot, simple]")
+var spectate = flag.Bool("spectate", false, "enable terminal visualizer")
 
 func main() {
 	rand.Seed(time.Now().UnixNano())
@@ -66,14 +67,33 @@ func main() {
 		os.Exit(1)
 	}
 
-	var err error
-	err = c.Negotiate("robot", c.Player)
-	if err != nil {
+	if err := c.Negotiate("robot", c.Player); err != nil {
 		fmt.Fprintf(os.Stderr, "%s: failed to negociate: %s\n", c.Name, err)
 		os.Exit(1)
 	}
-	if err := c.Play(); err != nil {
-		fmt.Fprintf(os.Stderr, "problem during play: %v\n", err)
-		os.Exit(1)
+
+	if *spectate {
+		ui := client.NewSpectator(c.Width, c.Height)
+		players := client.MultiPlayer{
+			c.Player,
+			ui,
+		}
+		c.Player = players
+
+		go func() {
+			if err := c.Play(); err != nil {
+				fmt.Fprintf(os.Stderr, "problem during play: %v\n", err)
+				close(ui.Die)
+			}
+		}()
+		if err := ui.Spectate(); err != nil {
+			fmt.Fprintf(os.Stderr, "problem during visualization: %+v\n", err)
+			os.Exit(1)
+		}
+	} else {
+		if err := c.Play(); err != nil {
+			fmt.Fprintf(os.Stderr, "problem during play: %v\n", err)
+			os.Exit(1)
+		}
 	}
 }

player.go

@@ -23,3 +23,37 @@ type Player interface {
 	// the instructions for each robot in a map of robot id to instructions
 	Update(bs *server.Boardstate) map[string]server.Instruction
 }
+
+// MultiPlayer wraps multiple players and calls funcitons in Player in
+// appropriate order.
+//
+// Typically used to add a Spectator to a bot.
+type MultiPlayer []Player
+
+// GetStats implements GetStats for a collection of players asking each player
+// for their stats, and returning the configuration of the first player.
+func (mp MultiPlayer) GetStats() map[string]server.StatsRequest {
+	var s map[string]server.StatsRequest
+	for i := len(mp) - 1; i >= 0; i-- {
+		s = mp[i].GetStats()
+	}
+	return s
+}
+
+// SetIDs passes ids to all players.
+func (mp MultiPlayer) SetIDs(ids map[string]string) {
+	for _, p := range mp {
+		p.SetIDs(ids)
+	}
+}
+
+// Update implements Update for a collection of players sending board state to
+// each player, and returning the instructions associated with the first
+// player.
+func (mp MultiPlayer) Update(bs *server.Boardstate) map[string]server.Instruction {
+	var inst map[string]server.Instruction
+	for i := len(mp) - 1; i >= 0; i-- {
+		inst = mp[i].Update(bs)
+	}
+	return inst
+}