add a bot example "minimal"

examples/minimal/minimal.go

@@ -0,0 +1,80 @@
+// Daze could join an offline-mode server as client.
+// Just standing there and do nothing. Automatically reborn after five seconds of death.
+package main
+
+import (
+	"errors"
+	"flag"
+	"log"
+
+	"github.com/Tnze/go-mc/bot"
+	"github.com/Tnze/go-mc/bot/basic"
+	"github.com/Tnze/go-mc/chat"
+	//_ "github.com/Tnze/go-mc/data/lang/zh-cn"
+)
+
+var (
+	address     = flag.String("address", "127.0.0.1:25565", "The server address")
+	name        = flag.String("name", "Daze", "The player's name")
+	playerID    = flag.String("uuid", "", "The player's UUID")
+	accessToken = flag.String("token", "", "AccessToken")
+)
+
+var (
+	client *bot.Client
+	player *basic.Player
+)
+
+func main() {
+	flag.Parse()
+	client = bot.NewClient()
+	client.Auth = bot.Auth{
+		Name: *name,
+		UUID: *playerID,
+		AsTk: *accessToken,
+	}
+	player = basic.NewPlayer(client, basic.DefaultSettings, basic.EventsListener{
+		Disconnect: onDisconnect,
+	})
+
+	// Login
+	err := client.JoinServer(*address)
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println("Login success")
+
+	// JoinGame
+	for {
+		if err = client.HandleGame(); err == nil {
+			panic("HandleGame never return nil")
+		}
+
+		if err2 := new(bot.PacketHandlerError); errors.As(err, err2) {
+			if err := new(DisconnectErr); errors.As(err2, err) {
+				log.Print("Disconnect, reason: ", err.Reason)
+				return
+			} else {
+				// normal packet handler error, ignore and continue.
+				log.Print(err2)
+			}
+		} else {
+			// if the error is not a PacketHandlerError, the connection is broken.
+			// stop the program
+			log.Fatal(err)
+		}
+	}
+}
+
+type DisconnectErr struct {
+	Reason chat.Message
+}
+
+func (d DisconnectErr) Error() string {
+	return "disconnect: " + d.Reason.ClearString()
+}
+
+func onDisconnect(reason chat.Message) error {
+	// return an error value so that we can stop main loop
+	return DisconnectErr{Reason: reason}
+}