Add custom name attribute

README.md

@@ -6,7 +6,7 @@ Its goal is to be a modern alternative to Bukkit, Spigot and Paper. It is primar
 is possible with the existing alternatives, but it can also be used for something like a lobby/hub server.
 
 The most important thing for Uranos is
-[developer experience (DX)](https://medium.com/swlh/what-is-dx-developer-experience-401a0e44a9d9). After that comes performance.
+[developer experience (DX)](https://css-tricks.com/what-is-developer-experience-dx/). After that comes performance.
 
 ## Milestones
 

test-plugin/src/main/kotlin/space/uranos/testplugin/TestPlugin.kt

@@ -106,9 +106,10 @@ class TestPlugin : Plugin("Test", "1.0.0") {
         val entity = Uranos.create<CowEntity>()
         entity.position = Position(0.0, 4.0, 0.0)
         entity.setWorld(world)
+        entity.alwaysShowName = true
 
-        Uranos.scheduler.executeRepeating(20) {
-            entity.isBaby = !entity.isBaby
+        Uranos.scheduler.executeRepeating(10) {
+//            entity.customName = TextComponent("Cow", color = ChatColor.NAMED_COLORS.values.random())
         }
     }
 }

uranos-api/src/main/kotlin/space/uranos/entity/LivingEntity.kt

@@ -1,5 +1,8 @@
 package space.uranos.entity
 
+import space.uranos.chat.ChatComponent
+
 interface LivingEntity : Entity, Mobile {
-    // potion effects
+    var customName: ChatComponent?
+    var alwaysShowName: Boolean
 }

uranos-packet-codecs/src/main/kotlin/space/uranos/net/packet/play/EntityMetadataPacketCodec.kt

@@ -26,6 +26,7 @@ object EntityMetadataPacketCodec : OutgoingPacketCodec<EntityMetadataPacket>(0x4
                     }
                 }
                 is EntityMetadataPacket.Entry.Boolean -> dst.writeBoolean(entry.value)
+                else -> throw NotImplementedError()
             }
         }
 

uranos-server/src/main/kotlin/space/uranos/entity/UranosEntity.kt

@@ -4,8 +4,10 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import space.uranos.*
+import space.uranos.chat.ChatComponent
 import space.uranos.entity.event.ViewingChangedEvent
 import space.uranos.entity.impl.UranosPlayerEntity
+import space.uranos.entity.metadata.EntityMetadataFieldsTable
 import space.uranos.net.packet.OutgoingPacket
 import space.uranos.net.packet.play.*
 import space.uranos.player.Player
@@ -97,6 +99,16 @@ sealed class UranosLivingEntity(server: UranosServer) : UranosEntity(server), Li
     override var velocity: Vector = Vector.ZERO
     override var position: Position = Position.ZERO
     override val chunkKey: Chunk.Key by memoized({ position }) { Chunk.Key.from(position) }
+
+    override var customName: ChatComponent? = null
+    override var alwaysShowName: Boolean = false
+
+    companion object {
+        fun EntityMetadataFieldsTable.BuilderContext.livingEntity() {
+            optional(2u, LivingEntity::customName)
+            required(3u, LivingEntity::alwaysShowName)
+        }
+    }
 }
 
 abstract class UranosNotHasMovableHeadLivingEntity(server: UranosServer) : UranosLivingEntity(server) {

uranos-server/src/main/kotlin/space/uranos/entity/impl/UranosCowEntity.kt

@@ -14,6 +14,8 @@ class UranosCowEntity(server: UranosServer) : UranosHasMovableHeadLivingEntity(s
 
     companion object {
         val entityMetadataFieldsTable = EntityMetadataFieldsTable.DEFAULT.extend {
+            livingEntity()
+
             required(15u, Ageable::isBaby)
         }
     }

uranos-server/src/main/kotlin/space/uranos/entity/metadata/EntityMetadataFieldsTable.kt

@@ -60,8 +60,10 @@ class EntityMetadataFieldsTable private constructor(val fields: Map<UByte, Field
             }
         }
 
-        class Computed(dependingProperties: Array<KProperty1<out Entity, *>>, val getEntry: (index: UByte, entity: Entity) -> EntityMetadataPacket.Entry<*>) :
-            Field(dependingProperties) {
+        class Computed(
+            dependingProperties: Array<KProperty1<out Entity, *>>,
+            val getEntry: (index: UByte, entity: Entity) -> EntityMetadataPacket.Entry<*>
+        ) : Field(dependingProperties) {
             override fun createMetadataPacketEntry(index: UByte, entity: Entity) = getEntry(index, entity)
         }
     }
@@ -70,7 +72,7 @@ class EntityMetadataFieldsTable private constructor(val fields: Map<UByte, Field
         EntityMetadataFieldsTable(fields.plus(buildMap { BuilderContext(this).init() }))
 
     @BuilderMarker
-    @Suppress("INAPPLICABLE_JVM_NAME")
+    @Suppress("INAPPLICABLE_JVM_NAME") // Fails during build without this annotation. Maybe a bug
     class BuilderContext(private val fields: MutableMap<UByte, Field>) {
         @JvmName("requiredInt")
         fun required(index: UByte, property: KProperty1<out Entity, Int>) {
@@ -143,13 +145,6 @@ class EntityMetadataFieldsTable private constructor(val fields: Map<UByte, Field
                 +Entity::glowing
                 +false // flying with an elytra
             }
-
-            static(1u, 0) // ticks until drowning
-            static(2u, false) // custom name
-            static(3u, false) // custom name visible
-            static(4u, false) // silent
-            static(5u, false) // ignores gravity
-            static(6u, 0) // pose
         }
     }
 }