Changes to the left-clicking with the Chisel in-hand...

Basicly, the Chisel as item can't break ANY blocks anymore, it's all handled through Forge-events.
I don't think there are needs to check, if the config-option for this is enabled / disabled, so the item can still break blocks in the world... Seems useless..

src/main/java/info/jbcs/minecraft/chisel/Chisel.java

@@ -16,6 +16,8 @@ import cpw.mods.fml.common.registry.EntityRegistry;
 import cpw.mods.fml.common.registry.GameRegistry;
 import cpw.mods.fml.common.registry.GameRegistry.Type;
 import info.jbcs.minecraft.chisel.carving.Carving;
+import info.jbcs.minecraft.chisel.carving.CarvingVariation;
+import info.jbcs.minecraft.chisel.client.GeneralChiselClient;
 import info.jbcs.minecraft.chisel.client.gui.GuiChisel;
 import info.jbcs.minecraft.chisel.entity.EntityBallOMoss;
 import info.jbcs.minecraft.chisel.entity.EntityCloudInABottle;
@@ -26,14 +28,21 @@ import info.jbcs.minecraft.chisel.item.ItemBallOMoss;
 import info.jbcs.minecraft.chisel.item.ItemChisel;
 import info.jbcs.minecraft.chisel.item.ItemCloudInABottle;
 import info.jbcs.minecraft.chisel.item.ItemSmashingRock;
+import net.minecraft.block.Block;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.init.Blocks;
 import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
 import net.minecraft.world.World;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.common.config.Configuration;
+import net.minecraftforge.event.entity.player.PlayerInteractEvent;
+import net.minecraftforge.event.world.BlockEvent;
 
 import java.io.File;
+import java.util.HashMap;
+import java.util.Random;
 
 
 @Mod(modid = Chisel.MOD_ID, name = Chisel.MOD_NAME, version = "@MOD_VERSION@", guiFactory = "info.jbcs.minecraft.chisel.client.gui.GuiFactory"/*, dependencies = "after:ForgeMicroblock;"*/)
@@ -178,4 +187,136 @@ public class Chisel
             Configurations.refreshConfig();
         }
     }
+
+    HashMap<String, Long> chiselUseTime = new HashMap<String, Long>();
+    HashMap<String, String> chiselUseLocation = new HashMap<String, String>();
+    Random random = new Random();
+
+    @SubscribeEvent
+    public void onPlayerClick(PlayerInteractEvent event) {
+        if(event.action != PlayerInteractEvent.Action.LEFT_CLICK_BLOCK) return;
+        if (!Configurations.enableChiseling) return;
+        EntityPlayer player = event.entityPlayer;
+        ItemStack stack = player.getHeldItem();
+        if (stack == null || stack.getItem() != chisel) return;
+
+        World world = event.world;
+        int x = event.x;
+        int y = event.y;
+        int z = event.z;
+
+        Block block = world.getBlock(x, y, z);
+        int blockMeta = world.getBlockMetadata(x, y, z);
+
+        ItemStack chiselTarget = null;
+
+        if(stack.stackTagCompound != null)
+        {
+            chiselTarget = ItemStack.loadItemStackFromNBT(stack.stackTagCompound.getCompoundTag("chiselTarget"));
+        }
+
+        boolean chiselHasBlockInside = true;
+
+        if(chiselTarget == null)
+        {
+            chiselHasBlockInside = false;
+
+            Long useTime = chiselUseTime.get(player.getCommandSenderName());
+            String loc = chiselUseLocation.get(player.getCommandSenderName());
+
+            if(useTime != null && chiselUseLocation != null && loc.equals(x + "|" + y + "|" + z))
+            {
+                long cooldown = 20;
+                long time = world.getWorldInfo().getWorldTotalTime();
+
+                if(time>useTime-cooldown && time<useTime+cooldown) return; //noReplace = true;
+            }
+
+            CarvingVariation[] variations = ItemChisel.carving.getVariations(block, blockMeta);
+            if(variations == null || variations.length < 2) return; //noReplace = true;
+            else
+            {
+                int index = blockMeta +1;
+                while(variations[index].block.equals(block) && variations[index].damage == blockMeta)
+                {
+                    index++;
+                    if(index >= variations.length) index = 0;
+                }
+                CarvingVariation var = variations[index];
+                chiselTarget = new ItemStack(var.block, 1, var.damage);
+            }
+        }
+        Item result = null;
+        int targetMeta = 0;
+
+        Item target = chiselTarget.getItem();
+
+        targetMeta = chiselTarget.getItemDamage();
+
+        boolean match = ItemChisel.carving.isVariationOfSameClass(Block.getBlockFromItem(target), targetMeta, block, blockMeta);
+        result = target;
+
+        /* special case: stone can be carved to cobble and bricks */
+        if(Configurations.chiselStoneToCobbleBricks)
+        {
+            if(!match && block.equals(Blocks.stone) && Block.getBlockFromItem(target).equals(ChiselBlocks.blockCobblestone))
+                match = true;
+            if(!match && block.equals(Blocks.stone) && Block.getBlockFromItem(target).equals(ChiselBlocks.stoneBrick))
+                match = true;
+        }
+        if(!match)
+            return; //noReplace = true;
+
+        int updateValue = 1;
+
+        if(!world.isRemote || chiselHasBlockInside)
+        {
+            world.setBlock(x, y, z, Block.getBlockFromItem(result), targetMeta, updateValue);
+        }
+
+        switch(FMLCommonHandler.instance().getEffectiveSide())
+        {
+            case SERVER:
+                chiselUseTime.put(player.getCommandSenderName(), world.getWorldInfo().getWorldTotalTime());
+                chiselUseLocation.put(player.getCommandSenderName(), x + "|" + y + "|" + z);
+
+                try
+                {
+                    //TODO chisel left click thingy
+                    // Packet packet = Chisel.packet.create(Packets.CHISELED).writeInt(x).writeInt(y).writeInt(z);
+                    // Chisel.packet.sendToAllAround(packet, new TargetPoint(player.dimension, x, y, z, 30.0f));
+                } catch(Exception e)
+                {
+                    e.printStackTrace();
+                }
+                break;
+
+            case CLIENT:
+                if(chiselHasBlockInside)
+                {
+                    String sound = ItemChisel.carving.getVariationSound(result, chiselTarget.getItemDamage());
+                    GeneralChiselClient.spawnChiselEffect(x, y, z, sound);
+                }
+                break;
+
+            default:
+                break;
+        }
+
+        stack.damageItem(1, player);
+        if(stack.stackSize == 0)
+        {
+            player.inventory.mainInventory[player.inventory.currentItem] = chiselHasBlockInside ? chiselTarget : null;
+        }
+    }
+
+    @SubscribeEvent
+    public void onBlockBreak(BlockEvent.BreakEvent event) {
+        if (!Configurations.enableChiseling) return;
+        EntityPlayer player = event.getPlayer();
+        ItemStack stack = player.getHeldItem();
+        if (stack == null || stack.getItem() != chisel) return;
+
+        event.setCanceled(true);
+    }
 }