function HandleIGCmdHello(a_Split, a_Player, a_EntireCmd, a_CommandOutput)
  -- In-game command handler, a_Player is a cPlayer object
  return true, "SomeMessage"  -- SomeMessage is sent to the player; nothing gets sent if an empty string or nil is returned
end

function HandleConCmdHello(a_Split, a_Nil, a_EntireCmd, a_CommandOutput)
  -- Console command handler, a_Nil is always nil
  return true, "SomeMessage"  -- SomeMessage is output to the console
end

function HandleCBCmdHello(a_Split, a_CommandBlockEntity, a_EntireCmd, a_CommandOutput)
  -- Command block command handler, a_CommandBlockEntity is the cCommandBlockEntity executing the command
  return true, "SomeMessage"  -- SomeMessage is set as the command's output (shown in the UI)
end

function HandleCertainCommand(a_Split, a_Player, a_EntireCmd, a_CommandOutput)
	local function OnChunkLoaded(a_ChunkX, a_ChunkZ)
		a_CommandOutput:AddToMsg(a_ChunkX .. " " .. a_ChunkZ .. "was loaded")
		a_CommandOutput:Terminate()
	end
	
	-- Load the chunk the player is standing in
	
	return false, "Chunk "
end

--- Lists all entities in a given chunk
function HandleConsoleEnumChunkEntities(a_Split, a_Player, a_EntireCmd, a_CommandOutput)
  local worldName = a_Split[2]
  local chunkX = tonumber(a_Split[3])
  local chunkZ = tonumber(a_Split[4])
  
  local world = cRoot:Get():GetWorld(worldName)
  world:ChunkStay({{chunkX, chunkZ}},
    nil,  -- ChunkAvailable
    function ()  -- AllChunksReady
      -- The chunk has been loaded, enum the entities:
      world:ForEachEntityInChunk(chunkX, chunkZ,
        function (a_Entity)
          a_CommandOutput.Add(string.format("Entity %s at {%d, %d, %d}", 
            a_Entity:GetClass(), a_Entity:GetPosX(), a_Entity:GetPosY(), a_Entity:GetPosZ())
          )
        end
      )
      -- All entities have been listed, terminate the output:
      a_CommandOutput.Terminate()
    end
  )

  return true  -- Must not return a message - that would terminate the CommandOutput immediately
end