Create common nms module.

nms/nms-common/build.gradle.kts

@@ -0,0 +1,14 @@
+group = rootProject.group
+version = rootProject.version
+
+repositories {
+    // ProtocoLib
+    maven (url = "https://repo.dmulloy2.net/repository/public/" )
+
+}
+
+dependencies {
+    // Protocolib
+    compileOnly("com.comphenix.protocol:ProtocolLib:5.1.0")
+
+}

nms/nms-common/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/packet/AbstractPacketManager.kt

@@ -0,0 +1,13 @@
+package xyz.alexcrea.cuanvil.dependency.packet
+
+import org.bukkit.entity.Player
+
+abstract class AbstractPacketManager : PacketManager {
+    override val canSetInstantBuild: Boolean
+        get() = false
+
+    override fun setInstantBuild(player: Player, instantBuild: Boolean) {
+        // Default empty.
+    }
+
+}

nms/nms-common/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/packet/NoPacketManager.kt

@@ -0,0 +1,4 @@
+package xyz.alexcrea.cuanvil.dependency.packet
+
+// ProtocoLib not installed and not in a supported version: We do nothing
+class NoPacketManager: AbstractPacketManager()

nms/nms-common/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/packet/PacketManager.kt

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+package xyz.alexcrea.cuanvil.dependency.packet
+
+import org.bukkit.entity.Player
+
+interface PacketManager {
+
+    /**
+     * If the provided packet manager if able to set instant build.
+     */
+    val canSetInstantBuild: Boolean
+
+    /**
+     * Try to set instant build properties
+     */
+    fun setInstantBuild(player: Player, instantBuild: Boolean)
+
+}

nms/nms-common/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/packet/ProtocoLibWrapper.kt

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+package xyz.alexcrea.cuanvil.dependency.packet
+
+import com.comphenix.protocol.PacketType
+import com.comphenix.protocol.ProtocolLibrary
+import com.comphenix.protocol.ProtocolManager
+import com.comphenix.protocol.events.PacketContainer
+import org.bukkit.entity.Player
+import java.lang.reflect.InvocationTargetException
+
+class ProtocoLibWrapper: PacketManager {
+
+    private val protocolManager: ProtocolManager = ProtocolLibrary.getProtocolManager();
+
+    override val canSetInstantBuild: Boolean
+        get() = true
+
+    override fun setInstantBuild(player: Player, instantBuild: Boolean) {
+        val packet = PacketContainer(PacketType.Play.Server.ABILITIES)
+
+        // Set player's properties
+        packet.float
+            .write(0, player.flySpeed / 2)
+            .write(1, player.walkSpeed / 2)
+
+        packet.booleans
+            .write(0, player.isInvulnerable)
+            .write(1, player.isFlying)
+            .write(2, player.allowFlight)
+            .write(3, instantBuild)
+
+        // Send packet
+        try {
+            protocolManager.sendServerPacket(player, packet)
+        } catch (e: InvocationTargetException) {
+            e.printStackTrace()
+        }
+    }
+
+}