fix multi arg tab complete suggestion (#46)

pkg/edition/java/proxy/player.go

@@ -402,13 +402,9 @@ func (p *connectedPlayer) connectedServer() *serverConnection {
 	return p.connectedServer_
 }
 
-func (p *connectedPlayer) Username() string {
-	return p.profile.Name
-}
+func (p *connectedPlayer) Username() string { return p.profile.Name }
 
-func (p *connectedPlayer) ID() uuid.UUID {
-	return p.profile.ID
-}
+func (p *connectedPlayer) ID() uuid.UUID { return p.profile.ID }
 
 func (p *connectedPlayer) Disconnect(reason component.Component) {
 	if !p.Active() {
@@ -426,9 +422,7 @@ func (p *connectedPlayer) Disconnect(reason component.Component) {
 	}
 }
 
-func (p *connectedPlayer) String() string {
-	return p.profile.Name
-}
+func (p *connectedPlayer) String() string { return p.profile.Name }
 
 func (p *connectedPlayer) sendLegacyForgeHandshakeResetPacket() {
 	p.phase().resetConnectionPhase(p)

pkg/edition/java/proxy/session_client_play.go

@@ -504,8 +504,13 @@ func (c *clientPlaySessionHandler) handleTabCompleteRequest(p *packet.TabComplet
 }
 
 func (c *clientPlaySessionHandler) handleCommandTabComplete(p *packet.TabCompleteRequest) {
+	startPos := strings.LastIndex(p.Command, " ") + 1
+	if !(startPos > 0) {
+		return
+	}
+
 	// In 1.13+, we need to do additional work for the richer suggestions available.
-	cmd := p.Command[1:]
+	cmd := strings.TrimPrefix(p.Command, "/")
 	cmdEndPosition := strings.Index(cmd, " ")
 	if cmdEndPosition == -1 {
 		cmdEndPosition = len(cmd)
@@ -532,22 +537,24 @@ func (c *clientPlaySessionHandler) handleCommandTabComplete(p *packet.TabComplet
 	if len(suggestions) == 0 {
 		return
 	}
+	if c.log1.Enabled() {
+		c.log1.Info("Response to TabCompleteRequest", "cmd", cmd, "suggestions", suggestions)
+	}
 
 	offers := make([]packet.TabCompleteOffer, 0, len(suggestions))
 	for _, suggestion := range suggestions {
 		offers = append(offers, packet.TabCompleteOffer{
 			Text: suggestion,
 		})
 	}
-	startPos := strings.Index(p.Command, " ") + 1
-	if startPos > 0 {
-		_ = c.player.WritePacket(&packet.TabCompleteResponse{
-			TransactionID: p.TransactionID,
-			Start:         startPos,
-			Length:        len(p.Command) - startPos,
-			Offers:        offers,
-		})
-	}
+
+	// Send suggestions
+	_ = c.player.WritePacket(&packet.TabCompleteResponse{
+		TransactionID: p.TransactionID,
+		Start:         startPos,
+		Length:        len(p.Command) - startPos,
+		Offers:        offers,
+	})
 }
 
 func (c *clientPlaySessionHandler) handleRegularTabComplete(p *packet.TabCompleteRequest) {

pkg/edition/java/proxy/session_login.go

@@ -234,7 +234,7 @@ func (l *loginSessionHandler) initPlayer(profile *profile.GameProfile, onlineMod
 		return
 	}
 
-	l.log.Info("Player has connected, completing login", "player", player)
+	l.log.Info("Player has connected, completing login", "player", player, "id", player.ID())
 
 	// Setup permissions
 	permSetup := &PermissionsSetupEvent{

pkg/internal/suggest/util.go

@@ -13,7 +13,10 @@ type suggestion struct {
 }
 
 func Build(builder *brigodier.SuggestionsBuilder, input string, candidates []string) *brigodier.Suggestions {
-	given := input[strings.Index(input, " ")+1:]
+	if input == "" {
+		return builder.Build()
+	}
+	given := input[strings.LastIndex(input, " ")+1:]
 	var result []suggestion
 	for _, text := range candidates {
 		score := Score(given, text)