Add structure generator command

(cherry picked from commit 5ca80395a35100c2d7686ad8839baaa57f8db07c)

worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/ext.fawe/v1_20_R3/PaperweightAdapter.java

@@ -67,12 +67,14 @@ import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.block.BlockTypes;
 import com.sk89q.worldedit.world.generation.ConfiguredFeatureType;
+import com.sk89q.worldedit.world.generation.StructureType;
 import com.sk89q.worldedit.world.item.ItemType;
 import net.minecraft.Util;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Holder;
 import net.minecraft.core.HolderSet;
 import net.minecraft.core.Registry;
+import net.minecraft.core.SectionPos;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
 import net.minecraft.network.protocol.game.ClientboundEntityEventPacket;
@@ -111,6 +113,9 @@ import net.minecraft.world.level.chunk.LevelChunk;
 import net.minecraft.world.level.dimension.LevelStem;
 import net.minecraft.world.level.levelgen.WorldOptions;
 import net.minecraft.world.level.levelgen.feature.ConfiguredFeature;
+import net.minecraft.world.level.levelgen.structure.BoundingBox;
+import net.minecraft.world.level.levelgen.structure.Structure;
+import net.minecraft.world.level.levelgen.structure.StructureStart;
 import net.minecraft.world.level.storage.LevelStorageSource;
 import net.minecraft.world.level.storage.PrimaryLevelData;
 import net.minecraft.world.phys.BlockHitResult;
@@ -894,12 +899,19 @@ public final class PaperweightAdapter implements BukkitImplAdapter<net.minecraft
                 BiomeType.REGISTRY.register(name.toString(), new BiomeType(name.toString()));
             }
         }
+
         // Features
         for (ResourceLocation name: server.registryAccess().registryOrThrow(Registries.CONFIGURED_FEATURE).keySet()) {
             if (ConfiguredFeatureType.REGISTRY.get(name.toString()) == null) {
                 ConfiguredFeatureType.REGISTRY.register(name.toString(), new ConfiguredFeatureType(name.toString()));
             }
         }
+        // Structures
+        for (ResourceLocation name : server.registryAccess().registryOrThrow(Registries.STRUCTURE).keySet()) {
+            if (StructureType.REGISTRY.get(name.toString()) == null) {
+                StructureType.REGISTRY.register(name.toString(), new StructureType(name.toString()));
+            }
+        }
 
         // BiomeCategories
         Registry<Biome> biomeRegistry = server.registryAccess().registryOrThrow(Registries.BIOME);
@@ -939,6 +951,29 @@ public final class PaperweightAdapter implements BukkitImplAdapter<net.minecraft
         return k != null && k.place(proxyLevel, chunkManager.getGenerator(), random, new BlockPos(pt.getBlockX(), pt.getBlockY(), pt.getBlockZ()));
     }
 
+    public boolean generateStructure(StructureType type, World world, EditSession session, BlockVector3 pt) {
+        ServerLevel originalWorld = ((CraftWorld) world).getHandle();
+        Structure k = originalWorld.registryAccess().registryOrThrow(Registries.STRUCTURE).get(ResourceLocation.tryParse(type.getId()));
+        if (k == null) {
+            return false;
+        }
+
+        ServerChunkCache chunkManager = originalWorld.getChunkSource();
+        WorldGenLevel proxyLevel = PaperweightServerLevelDelegateProxy.newInstance(session, originalWorld, this);
+        ChunkPos chunkPos = new ChunkPos(new BlockPos(pt.getBlockX(), pt.getBlockY(), pt.getBlockZ()));
+        StructureStart structureStart = k.generate(originalWorld.registryAccess(), chunkManager.getGenerator(), chunkManager.getGenerator().getBiomeSource(), chunkManager.randomState(), chunkManager.chunkMap.structureTemplateManager, originalWorld.getSeed(), chunkPos, 0, proxyLevel, biome -> true);
+
+        if (!structureStart.isValid()) {
+            return false;
+        } else {
+            BoundingBox boundingBox = structureStart.getBoundingBox();
+            ChunkPos min = new ChunkPos(SectionPos.blockToSectionCoord(boundingBox.minX()), SectionPos.blockToSectionCoord(boundingBox.minZ()));
+            ChunkPos max = new ChunkPos(SectionPos.blockToSectionCoord(boundingBox.maxX()), SectionPos.blockToSectionCoord(boundingBox.maxZ()));
+            ChunkPos.rangeClosed(min, max).forEach((chunkPosx) -> structureStart.placeInChunk(proxyLevel, originalWorld.structureManager(), chunkManager.getGenerator(), originalWorld.getRandom(), new BoundingBox(chunkPosx.getMinBlockX(), originalWorld.getMinBuildHeight(), chunkPosx.getMinBlockZ(), chunkPosx.getMaxBlockX(), originalWorld.getMaxBuildHeight(), chunkPosx.getMaxBlockZ()), chunkPosx));
+            return true;
+        }
+    }
+
     // ------------------------------------------------------------------------
     // Code that is less likely to break
     // ------------------------------------------------------------------------

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java

@@ -55,6 +55,7 @@ import com.sk89q.worldedit.world.block.BaseBlock;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.generation.ConfiguredFeatureType;
+import com.sk89q.worldedit.world.generation.StructureType;
 import com.sk89q.worldedit.world.weather.WeatherType;
 import com.sk89q.worldedit.world.weather.WeatherTypes;
 import io.papermc.lib.PaperLib;
@@ -530,6 +531,16 @@ public class BukkitWorld extends AbstractWorld {
         return false;
     }
 
+    @Override
+    public boolean generateStructure(StructureType type, EditSession editSession, BlockVector3 position) {
+        BukkitImplAdapter adapter = WorldEditPlugin.getInstance().getBukkitImplAdapter();
+        if (adapter != null) {
+            return adapter.generateStructure(type, getWorld(), editSession, position);
+        }
+        // No adapter, we can't generate this.
+        return false;
+    }
+
     private static volatile boolean hasWarnedImplError = false;
 
     @Override

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/BukkitImplAdapter.java

@@ -50,6 +50,7 @@ import com.sk89q.worldedit.world.block.BaseBlock;
 import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.generation.ConfiguredFeatureType;
+import com.sk89q.worldedit.world.generation.StructureType;
 import com.sk89q.worldedit.world.item.ItemType;
 import com.sk89q.worldedit.world.registry.BlockMaterial;
 import org.bukkit.Keyed;
@@ -337,6 +338,19 @@ public interface BukkitImplAdapter<T> extends IBukkitAdapter {
         throw new UnsupportedOperationException("This adapter does not support generating features.");
     }
 
+    /**
+     * Generates a Minecraft structure at the given location.
+     *
+     * @param feature The feature
+     * @param world The world
+     * @param session The EditSession
+     * @param pt The location
+     * @return If it succeeded
+     */
+    default boolean generateStructure(StructureType feature, World world, EditSession session, BlockVector3 pt) {
+        throw new UnsupportedOperationException("This adapter does not support generating features.");
+    }
+
     //FAWE start
     default BlockMaterial getMaterial(BlockType blockType) {
         return getMaterial(blockType.getDefaultState());

worldedit-core/src/main/java/com/sk89q/worldedit/command/GenerationCommands.java

@@ -58,6 +58,7 @@ import com.sk89q.worldedit.util.formatting.text.TextComponent;
 import com.sk89q.worldedit.world.biome.BiomeType;
 import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.generation.ConfiguredFeatureType;
+import com.sk89q.worldedit.world.generation.StructureType;
 import org.enginehub.piston.annotation.Command;
 import org.enginehub.piston.annotation.CommandContainer;
 import org.enginehub.piston.annotation.param.Arg;
@@ -377,6 +378,23 @@ public class GenerationCommands {
         return 0;
     }
 
+    @Command(
+            name = "/structure",
+            desc = "Generate Minecraft structures"
+    )
+    @CommandPermissions("worldedit.generation.structure")
+    @Logging(POSITION)
+    public int structure(Actor actor, LocalSession session, EditSession editSession,
+                        @Arg(desc = "The structure")
+                        StructureType feature) throws WorldEditException {
+        if (editSession.getWorld().generateStructure(feature, editSession, session.getPlacementPosition(actor))) {
+            actor.printInfo(Caption.of("worldedit.structure.created"));
+        } else {
+            actor.printError(Caption.of("worldedit.structure.failed"));
+        }
+        return 0;
+    }
+
     @Command(
             name = "/hpyramid",
             desc = "Generate a hollow pyramid"

worldedit-core/src/main/java/com/sk89q/worldedit/command/argument/RegistryConverter.java

@@ -33,6 +33,7 @@ import com.sk89q.worldedit.world.fluid.FluidCategory;
 import com.sk89q.worldedit.world.fluid.FluidType;
 import com.sk89q.worldedit.world.gamemode.GameMode;
 import com.sk89q.worldedit.world.generation.ConfiguredFeatureType;
+import com.sk89q.worldedit.world.generation.StructureType;
 import com.sk89q.worldedit.world.item.ItemCategory;
 import com.sk89q.worldedit.world.item.ItemType;
 import com.sk89q.worldedit.world.weather.WeatherType;
@@ -64,7 +65,8 @@ public final class RegistryConverter<V extends Keyed> implements ArgumentConvert
                         FluidCategory.class,
                         GameMode.class,
                         WeatherType.class,
-                        ConfiguredFeatureType.class
+                        ConfiguredFeatureType.class,
+                        StructureType.class
                 )
                 .stream()
                 .map(c -> (Class<Keyed>) c)

worldedit-core/src/main/java/com/sk89q/worldedit/world/World.java

@@ -47,6 +47,7 @@ import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.generation.ConfiguredFeatureType;
+import com.sk89q.worldedit.world.generation.StructureType;
 import com.sk89q.worldedit.world.weather.WeatherType;
 
 import javax.annotation.Nullable;
@@ -312,6 +313,10 @@ public interface World extends Extent, Keyed, IChunkCache<IChunkGet> {
     boolean generateTree(TreeGenerator.TreeType type, EditSession editSession, BlockVector3 position) throws
             MaxChangedBlocksException;
 
+    default boolean generateStructure(StructureType type, EditSession editSession, BlockVector3 position) {
+        return false;
+    }
+
     /**
      * Generate a feature at the given position.
      *

worldedit-core/src/main/java/com/sk89q/worldedit/world/generation/StructureType.java

@@ -0,0 +1,43 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.world.generation;
+
+import com.sk89q.worldedit.registry.Keyed;
+import com.sk89q.worldedit.registry.NamespacedRegistry;
+
+public class StructureType implements Keyed {
+    public static final NamespacedRegistry<StructureType> REGISTRY = new NamespacedRegistry<>("structure type");
+
+    private final String id;
+
+    public StructureType(String id) {
+        this.id = id;
+    }
+
+    @Override
+    public String getId() {
+        return this.id;
+    }
+
+    @Override
+    public String toString() {
+        return this.id;
+    }
+}

worldedit-core/src/main/resources/lang/strings.json

@@ -519,6 +519,8 @@
   "worldedit.pyramid.created": "{0} blocks have been created.",
   "worldedit.generate.created": "{0} blocks have been created.",
   "worldedit.generatebiome.changed": "{0} biomes affected.",
+  "worldedit.structure.created": "Structure created.",
+  "worldedit.structure.failed": "Failed to generate structure. Is it a valid spot for it?",
   "worldedit.reload.config": "Configuration reloaded!",
   "worldedit.report.written": "FAWE report written to {0}",
   "worldedit.report.error": "Failed to write report: {0}",