Regenerate and refresh chunk methods

By: Raphfrk <raphfrk@gmail.com>

paper-server/src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -149,6 +149,48 @@ public class CraftWorld implements World {
         return true;
     }
 
+    public boolean regenerateChunk(int x, int z) {
+        unloadChunk(x, z, false, false);
+
+        provider.a.remove(x, z);
+
+        net.minecraft.server.Chunk chunk = null;
+
+        if(provider.c == null) {
+            chunk = provider.b;
+        } else {
+            chunk = provider.c.b(x, z);
+        }
+
+        chunkLoadPostProcess(chunk, x, z);
+
+        refreshChunk(x, z);
+
+        return chunk != null;
+    }
+
+    public boolean refreshChunk(int x, int z) {
+        if(!isChunkLoaded(x, z)) {
+            return false;
+        }
+
+        int px = x<<4;
+        int pz = z<<4;
+
+        // If there are more than 10 updates to a chunk at once, it carries out the update as a cuboid
+        // This flags 16 blocks in a line along the bottom for update and then flags a block at the opposite corner at the top
+        // The cuboid that contains these 17 blocks covers the entire chunk
+        // The server will compress the chunk and send it to all clients
+
+        for(int xx = px; xx < (px + 16); xx++) {
+            world.g(xx, 0, pz);
+        }
+        world.g(px, 127, pz+15);
+
+        return true;
+    }
+
+
     public boolean isChunkInUse(int x, int z) {
         Player[] players = server.getOnlinePlayers();
         
@@ -180,6 +222,12 @@ public class CraftWorld implements World {
         if (chunk == null) {
             chunk = provider.e(x, z);
 
+            chunkLoadPostProcess(chunk, x, z);
+        }
+        return chunk != null;
+    }
+
+    private void chunkLoadPostProcess(net.minecraft.server.Chunk chunk, int x, int z) {
         if (chunk != null) {
             provider.e.put(x, z, chunk);
             provider.f.add(chunk);
@@ -204,8 +252,6 @@ public class CraftWorld implements World {
             }
         }
     }
-        return chunk != null;
-    }
 
     public boolean isChunkLoaded(Chunk chunk) {
         return isChunkLoaded(chunk.getX(), chunk.getZ());