Implement undo feature.

src/main/java/portablejim/bbw/BetterBuildersWandsMod.java

@@ -7,6 +7,7 @@ import cpw.mods.fml.common.Mod.EventHandler;
 import cpw.mods.fml.common.SidedProxy;
 import cpw.mods.fml.common.event.FMLInitializationEvent;
 import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+import cpw.mods.fml.common.event.FMLServerStartingEvent;
 import cpw.mods.fml.common.gameevent.InputEvent;
 import cpw.mods.fml.common.network.NetworkRegistry;
 import cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper;
@@ -23,6 +24,7 @@ import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.simple.SimpleLogger;
 import org.apache.logging.log4j.util.PropertiesUtil;
 import portablejim.bbw.core.BlockEvents;
+import portablejim.bbw.core.OopsCommand;
 import portablejim.bbw.core.items.ItemRestrictedWandAdvanced;
 import portablejim.bbw.core.items.ItemRestrictedWandBasic;
 import portablejim.bbw.core.items.ItemUnrestrictedWand;
@@ -112,6 +114,11 @@ public class BetterBuildersWandsMod {
         GameRegistry.addRecipe(new ShapelessRecipes(newWand(14), Arrays.asList(newWand(13), newWand(13))));
     }
 
+    @EventHandler
+    public void serverStarting(FMLServerStartingEvent event) {
+        event.registerServerCommand(new OopsCommand());
+    }
+
     @EventHandler
     public void keypress(InputEvent event) {
         //FMLClientHandler.instance().

src/main/java/portablejim/bbw/core/OopsCommand.java

@@ -0,0 +1,96 @@
+package portablejim.bbw.core;
+
+import cpw.mods.fml.common.registry.GameRegistry;
+import net.minecraft.command.CommandBase;
+import net.minecraft.command.ICommandSender;
+import net.minecraft.command.WrongUsageException;
+import net.minecraft.entity.item.EntityItem;
+import net.minecraft.entity.player.EntityPlayerMP;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.util.ChatComponentTranslation;
+import net.minecraftforge.common.util.Constants;
+import portablejim.bbw.BetterBuildersWandsMod;
+import portablejim.bbw.basics.Point3d;
+import portablejim.bbw.core.items.IWandItem;
+
+import java.util.ArrayList;
+
+/**
+ * /wandOops command.
+ */
+public class OopsCommand extends CommandBase {
+    @Override
+    public String getCommandName() {
+        return "wandOops";
+    }
+
+    @Override
+    public String getCommandUsage(ICommandSender sender) {
+        return "/wandOops";
+    }
+
+    @Override
+    public void processCommand(ICommandSender sender, String[] arguments) {
+        if(sender instanceof EntityPlayerMP) {
+            EntityPlayerMP player = (EntityPlayerMP) sender;
+            ItemStack currentItemstack = player.getCurrentEquippedItem();
+            if(currentItemstack != null && currentItemstack.getItem() != null
+                    && currentItemstack.getItem() instanceof IWandItem) {
+                NBTTagCompound tagComponent = currentItemstack.getTagCompound();
+
+                NBTTagCompound bbwCompound;
+                if(tagComponent != null && tagComponent.hasKey("bbw", Constants.NBT.TAG_COMPOUND) && tagComponent.getCompoundTag("bbw").hasKey("lastPlaced", Constants.NBT.TAG_INT_ARRAY)) {
+                    bbwCompound = tagComponent.getCompoundTag("bbw");
+                    ArrayList<Point3d> pointList = unpackNbt(bbwCompound.getIntArray("lastPlaced"));
+                    for (Point3d point : pointList) {
+                        player.getEntityWorld().setBlockToAir(point.x, point.y, point.z);
+                    }
+                    if(bbwCompound.hasKey("lastBlock", Constants.NBT.TAG_STRING) && bbwCompound.hasKey("lastPerBlock", Constants.NBT.TAG_INT)) {
+                        GameRegistry.UniqueIdentifier lastBlock = new GameRegistry.UniqueIdentifier(bbwCompound.getString("lastBlock"));
+                        ItemStack itemStack = GameRegistry.findItemStack(lastBlock.modId, lastBlock.name, 1);
+                        int count = bbwCompound.getInteger("lastPerBlock") * pointList.size();
+                        int stackSize = itemStack.getMaxStackSize();
+                        int fullStacks = count / stackSize;
+                        for(int i = 0; i < fullStacks; i++) {
+                            ItemStack newStack = itemStack.copy();
+                            newStack.stackSize = stackSize;
+                            player.worldObj.spawnEntityInWorld(new EntityItem(player.getEntityWorld(), player.posX, player.posY, player.posZ, newStack));
+                        }
+                        ItemStack finalStack = itemStack.copy();
+                        finalStack.stackSize = count % stackSize;
+                        player.worldObj.spawnEntityInWorld(new EntityItem(player.getEntityWorld(), player.posX, player.posY, player.posZ, finalStack));
+
+                        bbwCompound.removeTag("lastPlaced");
+                        bbwCompound.removeTag("lastBlock");
+                        bbwCompound.removeTag("lastPerBlock");
+                    }
+                }
+                else {
+                    throw new WrongUsageException(BetterBuildersWandsMod.LANGID + ".chat.error.noundo");
+                }
+            }
+            else {
+                throw new WrongUsageException(BetterBuildersWandsMod.LANGID + ".chat.error.nowand");
+            }
+        }
+        else {
+            throw new WrongUsageException(BetterBuildersWandsMod.LANGID + ".chat.error.bot");
+        }
+    }
+
+    protected ArrayList<Point3d> unpackNbt(int[] placedBlocks) {
+        ArrayList<Point3d> output = new ArrayList<Point3d>();
+        int countPoints = placedBlocks.length / 3;
+        for(int i = 0; i < countPoints * 3; i += 3) {
+            output.add(new Point3d(placedBlocks[i], placedBlocks[i+1], placedBlocks[i+2]));
+        }
+
+        return output;
+    }
+
+
+    public int getRequiredPermissionLevel() {
+        return 0;
+    }
+}

src/main/java/portablejim/bbw/core/WandWorker.java

@@ -2,18 +2,17 @@ package portablejim.bbw.core;
 
 import cpw.mods.fml.common.FMLLog;
 import net.minecraft.block.Block;
-import net.minecraft.block.BlockCrops;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.AxisAlignedBB;
 import net.minecraftforge.common.util.ForgeDirection;
-import net.minecraftforge.fluids.FluidRegistry;
 import portablejim.bbw.core.wands.IWand;
 import portablejim.bbw.basics.EnumLock;
 import portablejim.bbw.basics.Point3d;
 import portablejim.bbw.shims.IPlayerShim;
 import portablejim.bbw.shims.IWorldShim;
 
+import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.LinkedList;
 
@@ -146,7 +145,8 @@ public class WandWorker {
         return toPlace;
     }
 
-    public void placeBlocks(ItemStack itemStack, LinkedList<Point3d> blockPosList, Point3d originalBlock) {
+    public ArrayList<Point3d> placeBlocks(ItemStack itemStack, LinkedList<Point3d> blockPosList, Point3d originalBlock) {
+        ArrayList<Point3d> placedBlocks = new ArrayList<Point3d>();
         for(Point3d blockPos : blockPosList) {
             /*if(player.countItems(getEquivalentItemStack(originalBlock)) < 1) {
                 break;
@@ -156,6 +156,7 @@ public class WandWorker {
 
             if(blockPlaceSuccess) {
                 world.playPlaceAtBlock(blockPos, world.getBlock(originalBlock));
+                placedBlocks.add(blockPos);
                 if (!player.isCreative()) {
                     wand.placeBlock(itemStack, player.getPlayer());
                 }
@@ -163,8 +164,11 @@ public class WandWorker {
                 if(!takeFromInventory) {
                     FMLLog.info("BBW takeback: %s", blockPos.toString());
                     world.setBlockToAir(blockPos);
+                    placedBlocks.remove(placedBlocks.size() - 1);
                 }
             }
         }
+
+        return placedBlocks;
     }
 }

src/main/java/portablejim/bbw/core/items/ItemBasicWand.java

@@ -1,6 +1,7 @@
 package portablejim.bbw.core.items;
 
 import cpw.mods.fml.common.FMLLog;
+import cpw.mods.fml.common.registry.GameRegistry;
 import net.minecraft.block.Block;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.EntityLivingBase;
@@ -24,6 +25,7 @@ import portablejim.bbw.shims.CreativePlayerShim;
 import portablejim.bbw.shims.IPlayerShim;
 import portablejim.bbw.shims.IWorldShim;
 
+import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -62,7 +64,21 @@ public abstract class ItemBasicWand extends Item implements IWandItem{
             if (targetItemstack != null) {
                 LinkedList<Point3d> blocks = worker.getBlockPositionList(clickedPos, ForgeDirection.getOrientation(side), numBlocks, getMode(itemstack), getFaceLock(itemstack));
 
-                worker.placeBlocks(itemstack, blocks, clickedPos);
+                ArrayList<Point3d> placedBlocks = worker.placeBlocks(itemstack, blocks, clickedPos);
+                if(placedBlocks.size() > 0) {
+                    int[] placedIntArray = new int[placedBlocks.size() * 3];
+                    for (int i = 0; i < placedBlocks.size(); i++) {
+                        Point3d currentPoint = placedBlocks.get(i);
+                        placedIntArray[i * 3] = currentPoint.x;
+                        placedIntArray[i * 3 + 1] = currentPoint.y;
+                        placedIntArray[i * 3 + 2] = currentPoint.z;
+                    }
+                    NBTTagCompound placedNBT = new NBTTagCompound();
+                    placedNBT.setIntArray("lastPlaced", placedIntArray);
+                    placedNBT.setString("lastBlock", GameRegistry.findUniqueIdentifierFor(targetItemstack.getItem()).toString());
+                    placedNBT.setInteger("lastPerBlock", 1);
+                    itemstack.setTagInfo("bbw", placedNBT);
+                }
             }
 
         }

src/main/resources/assets/betterbuilderswands/lang/en_US.lang

@@ -21,3 +21,7 @@ bbw.chat.mode.verticaleastwest=Mode: East-West (+ Vertical) - Extend east, west,
 bbw.chat.mode.horizontal=Mode: Horizontal - Extend left and right from the original block. No building on top/bottom face.
 bbw.chat.mode.vertical= Mode: Vertical - Extend up and down from the original block. No building on top/bottom face
 bbw.chat.mode.nolock=Mode: No Lock - Extend left, right, up and down from the original block.
+
+bbw.chat.error.noundo=I can't remember what this wand last built.
+bbw.chat.error.nowand=You need to run this with a wand from Better Builders Wands in your hand.
+bbw.chat.error.bot=AI can detect Non-players. Please don't do that again.