Basic command block implementation

CONTRIBUTORS

@@ -20,5 +20,6 @@ worktycho
 Sxw1212
 tonibm19
 Diusrex
+structinf (xdot)
 
 Please add yourself to this list if you contribute to MCServer.

src/BlockEntities/BlockEntity.cpp

@@ -6,6 +6,7 @@
 #include "Globals.h"
 #include "BlockEntity.h"
 #include "ChestEntity.h"
+#include "CommandBlockEntity.h"
 #include "DispenserEntity.h"
 #include "DropperEntity.h"
 #include "EnderChestEntity.h"
@@ -23,17 +24,18 @@ cBlockEntity * cBlockEntity::CreateByBlockType(BLOCKTYPE a_BlockType, NIBBLETYPE
 {
 	switch (a_BlockType)
 	{
-		case E_BLOCK_CHEST:       return new cChestEntity      (a_BlockX, a_BlockY, a_BlockZ, a_World);
-		case E_BLOCK_DISPENSER:   return new cDispenserEntity  (a_BlockX, a_BlockY, a_BlockZ, a_World);
-		case E_BLOCK_DROPPER:     return new cDropperEntity    (a_BlockX, a_BlockY, a_BlockZ, a_World);
-		case E_BLOCK_ENDER_CHEST: return new cEnderChestEntity (a_BlockX, a_BlockY, a_BlockZ, a_World);
-		case E_BLOCK_LIT_FURNACE: return new cFurnaceEntity    (a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_BlockMeta, a_World);
-		case E_BLOCK_FURNACE:     return new cFurnaceEntity    (a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_BlockMeta, a_World);
-		case E_BLOCK_HOPPER:      return new cHopperEntity     (a_BlockX, a_BlockY, a_BlockZ, a_World);
-		case E_BLOCK_SIGN_POST:   return new cSignEntity       (a_BlockType, a_BlockX, a_BlockY, a_BlockZ, a_World);
-		case E_BLOCK_WALLSIGN:    return new cSignEntity       (a_BlockType, a_BlockX, a_BlockY, a_BlockZ, a_World);
-		case E_BLOCK_NOTE_BLOCK:  return new cNoteEntity       (a_BlockX, a_BlockY, a_BlockZ, a_World);
-		case E_BLOCK_JUKEBOX:     return new cJukeboxEntity    (a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_CHEST:         return new cChestEntity       (a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_COMMAND_BLOCK: return new cCommandBlockEntity(a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_DISPENSER:     return new cDispenserEntity   (a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_DROPPER:       return new cDropperEntity     (a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_ENDER_CHEST:   return new cEnderChestEntity  (a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_LIT_FURNACE:   return new cFurnaceEntity     (a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_BlockMeta, a_World);
+		case E_BLOCK_FURNACE:       return new cFurnaceEntity     (a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_BlockMeta, a_World);
+		case E_BLOCK_HOPPER:        return new cHopperEntity      (a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_SIGN_POST:     return new cSignEntity        (a_BlockType, a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_WALLSIGN:      return new cSignEntity        (a_BlockType, a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_NOTE_BLOCK:    return new cNoteEntity        (a_BlockX, a_BlockY, a_BlockZ, a_World);
+		case E_BLOCK_JUKEBOX:       return new cJukeboxEntity     (a_BlockX, a_BlockY, a_BlockZ, a_World);
 	}
 	LOGD("%s: Requesting creation of an unknown block entity - block type %d (%s)",
 		__FUNCTION__, a_BlockType, ItemTypeToString(a_BlockType).c_str()

src/BlockEntities/CommandBlockEntity.cpp

@@ -0,0 +1,173 @@
+
+// CommandBlockEntity.cpp
+
+// Implements the cCommandBlockEntity class representing a single command block in the world
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+#include "json/json.h"
+#include "CommandBlockEntity.h"
+#include "../Entities/Player.h"
+
+
+
+
+
+cCommandBlockEntity::cCommandBlockEntity(int a_X, int a_Y, int a_Z, cWorld * a_World) :
+	super(E_BLOCK_COMMAND_BLOCK, a_X, a_Y, a_Z, a_World),
+	m_ShouldExecute(false),
+	m_IsPowered(false)
+{
+	SetBlockEntity(this); // cBlockEntityWindowOwner
+}
+
+
+
+
+
+
+cCommandBlockEntity::~cCommandBlockEntity()
+{
+	// Tell window its owner is destroyed
+	cWindow * Window = GetWindow();
+	if (Window != NULL)
+	{
+		Window->OwnerDestroyed();
+	}
+}
+
+
+
+
+
+
+void cCommandBlockEntity::UsedBy(cPlayer * a_Player)
+{
+	cWindow * Window = GetWindow();
+	if (Window == NULL)
+	{
+		//OpenWindow(new cDropSpenserWindow(m_PosX, m_PosY, m_PosZ, this));
+		Window = GetWindow();
+	}
+	
+	if (Window != NULL)
+	{
+		if (a_Player->GetWindow() != Window)
+		{
+			a_Player->OpenWindow(Window);
+		}
+	}
+}
+
+
+
+
+
+void cCommandBlockEntity::SetCommand(const AString & a_Cmd)
+{
+	m_Command = a_Cmd;LOGD("Hrey %s", a_Cmd.c_str());
+}
+
+
+
+
+
+const AString & cCommandBlockEntity::GetCommand(void) const
+{
+	return m_Command;
+}
+
+
+
+
+
+const AString & cCommandBlockEntity::GetLastOutput(void) const
+{
+	return m_LastOutput;
+}
+
+
+
+
+
+void cCommandBlockEntity::Activate(void)
+{
+	m_ShouldExecute = true;
+}
+
+
+
+
+
+void cCommandBlockEntity::SetRedstonePower(bool a_IsPowered)
+{
+	if (a_IsPowered && !m_IsPowered)
+	{
+		Activate();
+	}
+	m_IsPowered = a_IsPowered;
+}
+
+
+
+
+
+bool cCommandBlockEntity::Tick(float a_Dt, cChunk & a_Chunk)
+{
+	if (!m_ShouldExecute)
+	{
+		return false;
+	}
+	
+	m_ShouldExecute = false;
+	Execute();
+	return true;
+}
+
+
+
+
+
+void cCommandBlockEntity::SendTo(cClientHandle & a_Client)
+{
+	// Nothing needs to be sent
+	UNUSED(a_Client);
+}
+
+
+
+
+
+bool cCommandBlockEntity::LoadFromJson(const Json::Value & a_Value)
+{
+	m_Command = a_Value.get("Command", "").asString();
+
+	m_LastOutput = a_Value.get("LastOutput", "").asString();
+
+	return true;
+}
+
+
+
+
+
+void cCommandBlockEntity::SaveToJson(Json::Value & a_Value)
+{
+	a_Value["Command"] = m_Command;
+
+	a_Value["LastOutput"] = m_LastOutput;
+}
+
+
+
+
+
+void cCommandBlockEntity::Execute()
+{
+	// TODO: Parse arguments and dispatch command
+	LOGD("Command: %s", m_Command.c_str());
+	m_LastOutput = "";
+}
+
+
+
+

src/BlockEntities/CommandBlockEntity.h

@@ -0,0 +1,85 @@
+
+// CommandBlockEntity.h
+
+// Declares the cCommandBlockEntity class representing a single command block in the world
+
+
+
+
+
+#pragma once
+
+#include "BlockEntityWithItems.h"
+#include "../UI/WindowOwner.h"
+
+
+
+
+
+namespace Json
+{
+	class Value;
+}
+
+
+
+
+
+// tolua_begin
+
+class cCommandBlockEntity : 
+	public cBlockEntity,
+	public cBlockEntityWindowOwner
+{
+	typedef cBlockEntity super;
+	
+public:
+
+	// tolua_end
+	
+	/// Creates a new empty command block entity
+	cCommandBlockEntity(int a_X, int a_Y, int a_Z, cWorld * a_World);
+	virtual ~cCommandBlockEntity();
+
+	bool LoadFromJson( const Json::Value& a_Value );
+	virtual void SaveToJson(Json::Value& a_Value ) override;
+
+	virtual bool Tick(float a_Dt, cChunk & a_Chunk) override;
+	virtual void SendTo(cClientHandle & a_Client) override;
+	virtual void UsedBy(cPlayer * a_Player) override;
+
+	// tolua_begin
+
+	/// Sets the internal redstone power flag to "on" or "off", depending on the parameter. Calls Activate() if appropriate
+	void SetRedstonePower(bool a_IsPowered);
+
+	/// Sets the command block to execute a command in the next tick
+	void Activate(void);
+	
+	/// Sets the command
+	void SetCommand(const AString & a_Cmd);
+
+	/// Retrieves stored command
+	const AString & GetCommand(void) const;
+
+	/// Retrieves the last line of output generated by the command block
+	const AString & GetLastOutput(void) const;
+	
+	// tolua_end
+	
+private:
+
+	/// Executes the associated command
+	void Execute();
+
+	bool m_ShouldExecute;
+	bool m_IsPowered;
+
+	AString  m_Command;
+
+	AString  m_LastOutput;
+} ;  // tolua_export
+
+
+
+

src/Chunk.cpp

@@ -1298,6 +1298,7 @@ void cChunk::CreateBlockEntities(void)
 				switch (BlockType)
 				{
 					case E_BLOCK_CHEST:
+					case E_BLOCK_COMMAND_BLOCK:
 					case E_BLOCK_DISPENSER:
 					case E_BLOCK_DROPPER:
 					case E_BLOCK_ENDER_CHEST:
@@ -1425,6 +1426,7 @@ void cChunk::SetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType,
 	switch (a_BlockType)
 	{
 		case E_BLOCK_CHEST:
+		case E_BLOCK_COMMAND_BLOCK:
 		case E_BLOCK_DISPENSER:
 		case E_BLOCK_DROPPER:
 		case E_BLOCK_ENDER_CHEST:
@@ -2268,6 +2270,38 @@ bool cChunk::DoWithNoteBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cNoteBl
 
 
 
+bool cChunk::DoWithCommandBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cCommandBlockCallback & a_Callback)
+{
+	// The blockentity list is locked by the parent chunkmap's CS
+	for (cBlockEntityList::iterator itr = m_BlockEntities.begin(), itr2 = itr; itr != m_BlockEntities.end(); itr = itr2)
+	{
+		++itr2;
+		if (((*itr)->GetPosX() != a_BlockX) || ((*itr)->GetPosY() != a_BlockY) || ((*itr)->GetPosZ() != a_BlockZ))
+		{
+			continue;
+		}
+		if ((*itr)->GetBlockType() != E_BLOCK_COMMAND_BLOCK)
+		{
+			// There is a block entity here, but of different type. No other block entity can be here, so we can safely bail out
+			return false;
+		}
+		
+		// The correct block entity is here, 
+		if (a_Callback.Item((cCommandBlockEntity *)*itr))
+		{
+			return false;
+		}
+		return true;
+	}  // for itr - m_BlockEntitites[]
+	
+	// Not found:
+	return false;
+}
+
+
+
+
+
 bool cChunk::GetSignLines(int a_BlockX, int a_BlockY, int a_BlockZ, AString & a_Line1, AString & a_Line2, AString & a_Line3, AString & a_Line4)
 {
 	// The blockentity list is locked by the parent chunkmap's CS

src/Chunk.h

@@ -40,12 +40,13 @@ class cFluidSimulatorData;
 class cMobCensus;
 class cMobSpawner;
 
-typedef std::list<cClientHandle *>      cClientHandleList;
-typedef cItemCallback<cEntity>          cEntityCallback;
-typedef cItemCallback<cChestEntity>     cChestCallback;
-typedef cItemCallback<cDispenserEntity> cDispenserCallback;
-typedef cItemCallback<cFurnaceEntity>   cFurnaceCallback;
-typedef cItemCallback<cNoteEntity>      cNoteBlockCallback;
+typedef std::list<cClientHandle *>         cClientHandleList;
+typedef cItemCallback<cEntity>             cEntityCallback;
+typedef cItemCallback<cChestEntity>        cChestCallback;
+typedef cItemCallback<cDispenserEntity>    cDispenserCallback;
+typedef cItemCallback<cFurnaceEntity>      cFurnaceCallback;
+typedef cItemCallback<cNoteEntity>         cNoteBlockCallback;
+typedef cItemCallback<cCommandBlockEntity> cCommandBlockCallback;
 
 
 
@@ -237,6 +238,9 @@ public:
 	/// Calls the callback for the noteblock at the specified coords; returns false if there's no noteblock at those coords or callback returns true, returns true if found
 	bool DoWithNoteBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cNoteBlockCallback & a_Callback);
 
+	/// Calls the callback for the command block at the specified coords; returns false if there's no command block at those coords or callback returns true, returns true if found
+	bool DoWithCommandBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cCommandBlockCallback & a_Callback); 
+
 	/// Retrieves the test on the sign at the specified coords; returns false if there's no sign at those coords, true if found
 	bool GetSignLines (int a_BlockX, int a_BlockY, int a_BlockZ, AString & a_Line1, AString & a_Line2, AString & a_Line3, AString & a_Line4);  // Lua-accessible
 

src/ChunkMap.cpp

@@ -1968,6 +1968,23 @@ bool cChunkMap::DoWithNoteBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cNot
 
 
 
+bool cChunkMap::DoWithCommandBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cCommandBlockCallback & a_Callback)
+{
+	int ChunkX, ChunkZ;
+	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
+	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
+	cCSLock Lock(m_CSLayers);
+	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ZERO_CHUNK_Y, ChunkZ);
+	if ((Chunk == NULL) && !Chunk->IsValid())
+	{
+		return false;
+	}
+	return Chunk->DoWithCommandBlockAt(a_BlockX, a_BlockY, a_BlockZ, a_Callback);
+}
+
+
+
+
 
 bool cChunkMap::GetSignLines(int a_BlockX, int a_BlockY, int a_BlockZ, AString & a_Line1, AString & a_Line2, AString & a_Line3, AString & a_Line4)
 {

src/ChunkMap.h

@@ -23,6 +23,7 @@ class cDropperEntity;
 class cDropSpenserEntity;
 class cFurnaceEntity;
 class cNoteEntity;
+class cCommandBlockEntity;
 class cPawn;
 class cPickup;
 class cChunkDataSerializer;
@@ -32,15 +33,16 @@ class cMobSpawner;
 
 typedef std::list<cClientHandle *>  cClientHandleList;
 typedef cChunk * cChunkPtr;
-typedef cItemCallback<cEntity>            cEntityCallback;
-typedef cItemCallback<cBlockEntity>       cBlockEntityCallback;
-typedef cItemCallback<cChestEntity>       cChestCallback;
-typedef cItemCallback<cDispenserEntity>   cDispenserCallback;
-typedef cItemCallback<cDropperEntity>     cDropperCallback;
-typedef cItemCallback<cDropSpenserEntity> cDropSpenserCallback;
-typedef cItemCallback<cFurnaceEntity>     cFurnaceCallback;
-typedef cItemCallback<cNoteEntity>        cNoteBlockCallback;
-typedef cItemCallback<cChunk>             cChunkCallback;
+typedef cItemCallback<cEntity>             cEntityCallback;
+typedef cItemCallback<cBlockEntity>        cBlockEntityCallback;
+typedef cItemCallback<cChestEntity>        cChestCallback;
+typedef cItemCallback<cDispenserEntity>    cDispenserCallback;
+typedef cItemCallback<cDropperEntity>      cDropperCallback;
+typedef cItemCallback<cDropSpenserEntity>  cDropSpenserCallback;
+typedef cItemCallback<cFurnaceEntity>      cFurnaceCallback;
+typedef cItemCallback<cNoteEntity>         cNoteBlockCallback;
+typedef cItemCallback<cCommandBlockEntity> cCommandBlockCallback;
+typedef cItemCallback<cChunk>              cChunkCallback;
 
 
 
@@ -236,6 +238,9 @@ public:
 	/// Calls the callback for the noteblock at the specified coords; returns false if there's no noteblock at those coords or callback returns true, returns true if found
 	bool DoWithNoteBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cNoteBlockCallback & a_Callback);  // Lua-accessible
 
+	/// Calls the callback for the command block at the specified coords; returns false if there's no command block at those coords or callback returns true, returns true if found
+	bool DoWithCommandBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cCommandBlockCallback & a_Callback);  // Lua-accessible
+
 	/// Retrieves the test on the sign at the specified coords; returns false if there's no sign at those coords, true if found
 	bool GetSignLines (int a_BlockX, int a_BlockY, int a_BlockZ, AString & a_Line1, AString & a_Line2, AString & a_Line3, AString & a_Line4);  // Lua-accessible
 

src/Simulator/RedstoneSimulator.cpp

@@ -4,6 +4,7 @@
 #include "RedstoneSimulator.h"
 #include "../BlockEntities/DropSpenserEntity.h"
 #include "../BlockEntities/NoteEntity.h"
+#include "../BlockEntities/CommandBlockEntity.h"
 #include "../Entities/TNTEntity.h"
 #include "../Blocks/BlockTorch.h"
 #include "../Blocks/BlockDoor.h"
@@ -215,11 +216,12 @@ void cRedstoneSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, c
 		{
 			case E_BLOCK_BLOCK_OF_REDSTONE:     HandleRedstoneBlock(a_X, dataitr->y, a_Z);	break;
 			case E_BLOCK_LEVER:                 HandleRedstoneLever(a_X, dataitr->y, a_Z);	break;
-			case E_BLOCK_TNT:                   HandleTNT(a_X, dataitr->y, a_Z);			break;
+			case E_BLOCK_TNT:                   HandleTNT(a_X, dataitr->y, a_Z);            break;
 			case E_BLOCK_TRAPDOOR:              HandleTrapdoor(a_X, dataitr->y, a_Z);       break;
 			case E_BLOCK_REDSTONE_WIRE:         HandleRedstoneWire(a_X, dataitr->y, a_Z);	break;
 			case E_BLOCK_NOTE_BLOCK:            HandleNoteBlock(a_X, dataitr->y, a_Z);      break;
 			case E_BLOCK_DAYLIGHT_SENSOR:       HandleDaylightSensor(a_X, dataitr->y, a_Z); break;
+			case E_BLOCK_COMMAND_BLOCK:         HandleCommandBlock(a_X, dataitr->y, a_Z);   break;
 
 			case E_BLOCK_REDSTONE_TORCH_OFF:
 			case E_BLOCK_REDSTONE_TORCH_ON:
@@ -763,6 +765,29 @@ void cRedstoneSimulator::HandleDoor(int a_BlockX, int a_BlockY, int a_BlockZ)
 
 
 
+void cRedstoneSimulator::HandleCommandBlock(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	class cSetPowerToCommandBlock :
+		public cCommandBlockCallback
+	{
+		bool m_IsPowered;
+	public:
+		cSetPowerToCommandBlock(bool a_IsPowered) : m_IsPowered(a_IsPowered) {}
+				
+		virtual bool Item(cCommandBlockEntity * a_CommandBlock) override
+		{
+			a_CommandBlock->SetRedstonePower(m_IsPowered);
+			return false;
+		}
+	} CmdBlockSP (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ));
+
+	m_World.DoWithCommandBlockAt(a_BlockX, a_BlockY, a_BlockZ, CmdBlockSP);
+}
+
+
+
+
+
 void cRedstoneSimulator::HandleRail(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyType)
 {
 	switch (a_MyType)

src/Simulator/RedstoneSimulator.h

@@ -110,6 +110,8 @@ private:
 	void HandleRedstoneLamp(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyState);
 	/** Handles doords */
 	void HandleDoor(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/** Handles command blocks */
+	void HandleCommandBlock(int a_BlockX, int a_BlockY, int a_BlockZ);
 	/** Handles activator, detector, and powered rails */
 	void HandleRail(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyType);
 	/** Handles trapdoors */
@@ -166,6 +168,7 @@ private:
 		switch (Block)
 		{
 			case E_BLOCK_ACTIVATOR_RAIL:
+			case E_BLOCK_COMMAND_BLOCK:
 			case E_BLOCK_PISTON:
 			case E_BLOCK_STICKY_PISTON:
 			case E_BLOCK_DISPENSER:
@@ -220,6 +223,7 @@ private:
 			case E_BLOCK_ACTIVATOR_RAIL:
 			case E_BLOCK_ACTIVE_COMPARATOR:
 			case E_BLOCK_BLOCK_OF_REDSTONE:
+			case E_BLOCK_COMMAND_BLOCK:
 			case E_BLOCK_DETECTOR_RAIL:
 			case E_BLOCK_DISPENSER:
 			case E_BLOCK_DAYLIGHT_SENSOR:

src/World.cpp

@@ -1149,6 +1149,15 @@ bool cWorld::DoWithNoteBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cNoteBl
 
 
 
+bool cWorld::DoWithCommandBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cCommandBlockCallback & a_Callback)
+{
+	return m_ChunkMap->DoWithCommandBlockAt(a_BlockX, a_BlockY, a_BlockZ, a_Callback);
+}
+
+
+
+
+
 bool cWorld::GetSignLines(int a_BlockX, int a_BlockY, int a_BlockZ, AString & a_Line1, AString & a_Line2, AString & a_Line3, AString & a_Line4)
 {
 	return m_ChunkMap->GetSignLines(a_BlockX, a_BlockY, a_BlockZ, a_Line1, a_Line2, a_Line3, a_Line4);

src/World.h

@@ -46,12 +46,13 @@ class cMobCensus;
 
 typedef std::list< cPlayer * > cPlayerList;
 
-typedef cItemCallback<cPlayer>          cPlayerListCallback;
-typedef cItemCallback<cEntity>          cEntityCallback;
-typedef cItemCallback<cChestEntity>     cChestCallback;
-typedef cItemCallback<cDispenserEntity> cDispenserCallback;
-typedef cItemCallback<cFurnaceEntity>   cFurnaceCallback;
-typedef cItemCallback<cNoteEntity>      cNoteBlockCallback;
+typedef cItemCallback<cPlayer>             cPlayerListCallback;
+typedef cItemCallback<cEntity>             cEntityCallback;
+typedef cItemCallback<cChestEntity>        cChestCallback;
+typedef cItemCallback<cDispenserEntity>    cDispenserCallback;
+typedef cItemCallback<cFurnaceEntity>      cFurnaceCallback;
+typedef cItemCallback<cNoteEntity>         cNoteBlockCallback;
+typedef cItemCallback<cCommandBlockEntity> cCommandBlockCallback;
 
 
 
@@ -466,6 +467,9 @@ public:
 
 	/// Calls the callback for the noteblock at the specified coords; returns false if there's no noteblock at those coords or callback returns true, returns true if found
 	bool DoWithNoteBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cNoteBlockCallback & a_Callback);  // Exported in ManualBindings.cpp
+
+	/// Calls the callback for the command block at the specified coords; returns false if there's no command block at those coords or callback returns true, returns true if found
+	bool DoWithCommandBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cCommandBlockCallback & a_Callback);  // TODO: Export
 	
 	/// Retrieves the test on the sign at the specified coords; returns false if there's no sign at those coords, true if found
 	bool GetSignLines (int a_BlockX, int a_BlockY, int a_BlockZ, AString & a_Line1, AString & a_Line2, AString & a_Line3, AString & a_Line4);  // Exported in ManualBindings.cpp