From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <blake.galbreath@gmail.com>
Date: Tue, 23 Mar 2021 19:38:53 -0500
Subject: [PATCH] Break individual slabs when sneaking


diff --git a/src/main/java/net/minecraft/server/level/PlayerInteractManager.java b/src/main/java/net/minecraft/server/level/PlayerInteractManager.java
index e47a743fd3adc62aa47beec722f49eeaded246bc..1f38bc36e957ca386774b615bc8b7a04470ce46c 100644
--- a/src/main/java/net/minecraft/server/level/PlayerInteractManager.java
+++ b/src/main/java/net/minecraft/server/level/PlayerInteractManager.java
@@ -409,6 +409,8 @@ public class PlayerInteractManager {
                 }
                 return false;
             }
+
+            if (this.player.world.purpurConfig.slabHalfBreak && this.player.isSneaking() && iblockdata.getBlock() instanceof net.minecraft.world.level.block.BlockStepAbstract && ((net.minecraft.world.level.block.BlockStepAbstract) iblockdata.getBlock()).halfBreak(iblockdata, blockposition, this.player)) return true; // Purpur
         }
         // CraftBukkit end
 
diff --git a/src/main/java/net/minecraft/world/level/block/BlockStepAbstract.java b/src/main/java/net/minecraft/world/level/block/BlockStepAbstract.java
index 12c0fa5072755fd2a4f575b0cc5e4222617490ce..94965b216d50b29b95f09fa9019c177b9c099e14 100644
--- a/src/main/java/net/minecraft/world/level/block/BlockStepAbstract.java
+++ b/src/main/java/net/minecraft/world/level/block/BlockStepAbstract.java
@@ -27,7 +27,7 @@ import net.minecraft.world.phys.shapes.VoxelShapes;
 
 public class BlockStepAbstract extends Block implements IBlockWaterlogged {
 
-    public static final BlockStateEnum<BlockPropertySlabType> a = BlockProperties.aK;
+    public static final BlockStateEnum<BlockPropertySlabType> a = BlockProperties.aK; public static BlockStateEnum<BlockPropertySlabType> slabType() { return a; } // Purpur - OBFHELPER
     public static final BlockStateBoolean b = BlockProperties.C;
     protected static final VoxelShape c = Block.a(0.0D, 0.0D, 0.0D, 16.0D, 8.0D, 16.0D);
     protected static final VoxelShape d = Block.a(0.0D, 8.0D, 0.0D, 16.0D, 16.0D, 16.0D);
@@ -134,4 +134,25 @@ public class BlockStepAbstract extends Block implements IBlockWaterlogged {
                 return false;
         }
     }
+
+    // Purpur start
+    public boolean halfBreak(IBlockData iblockdata, BlockPosition pos, net.minecraft.server.level.EntityPlayer player) {
+        if (iblockdata.get(BlockStepAbstract.slabType()) != BlockPropertySlabType.DOUBLE) {
+            return false;
+        }
+        net.minecraft.world.phys.MovingObjectPosition result = player.getRayTrace(16);
+        if (result == null) {
+            return false;
+        }
+        double hitY = result.getPos().getY();
+        int blockY = org.bukkit.util.NumberConversions.floor(hitY);
+        player.world.setTypeAndData(pos, iblockdata.set(BlockStepAbstract.slabType(), (hitY - blockY > 0.5 || blockY - pos.getY() == 1) ? BlockPropertySlabType.BOTTOM : BlockPropertySlabType.TOP), 3);
+        if (!player.abilities.canInstantlyBuild) {
+            net.minecraft.world.entity.item.EntityItem item = new net.minecraft.world.entity.item.EntityItem(player.world, pos.getX(), pos.getY(), pos.getZ(), new ItemStack(getItem()));
+            item.defaultPickupDelay();
+            player.world.addEntity(item);
+        }
+        return true;
+    }
+    // Purpur end
 }
diff --git a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
index c09c3a326e6ea80f3037a3d9fd6b78f03d8a7ecd..8054d6242358dc2bf212c7aff55ebf011c22e474 100644
--- a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
@@ -529,6 +529,11 @@ public class PurpurWorldConfig {
         signRightClickEdit = getBoolean("blocks.sign.right-click-edit", signRightClickEdit);
     }
 
+    public boolean slabHalfBreak = false;
+    private void slabSettings() {
+        slabHalfBreak = getBoolean("blocks.slab.break-individual-slabs-when-sneaking", slabHalfBreak);
+    }
+
     public boolean spawnerDeactivateByRedstone = false;
     private void spawnerSettings() {
         spawnerDeactivateByRedstone = getBoolean("blocks.spawner.deactivate-by-redstone", spawnerDeactivateByRedstone);
