Enchant Turtle

x,y,z = 0,0
dir = { [0]="-Y", [1]="+X", [2]="+Y", [3]="-X", [4]="-Y", [4]="+X" }
nDir = 1
cID = 60
rednet.open("right")
sr = peripheral.wrap("left")

function send(msg)
	rednet.send(cID,msg)
end

function goDirFor(bool)
	if bool then
		if dir[nDir] == "+X" then x = x + 1 elseif
		dir[nDir] == "-X" then x = x - 1 elseif
		dir[nDir] == "+Y" then y = y + 1 elseif
		dir[nDir] == "-Y" then y = y - 1 end
	else
		if dir[nDir] == "+X" then x = x - 1 elseif
		dir[nDir] == "-X" then x = x + 1 elseif
		dir[nDir] == "+Y" then y = y - 1 elseif
		dir[nDir] == "-Y" then y = y + 1 end
	end
end

function goFor()
	if turtle.forward() then
		goDirFor(true)
		return true
	else
		return false
	end
end

function goBack()
	if turtle.back() then
		goDirFor(false)
		return true
	else
		return false
	end
end

function goUp()
	return turtle.up()
end

function goDown()
	return turtle.down()
end

function turnRight()
	turtle.turnRight()
	if nDir < 4 then
		nDir = nDir + 1
	else
		nDir = 1
	end
end

function turnLeft()
	turtle.turnLeft()
	if nDir > 1 then
		nDir = nDir - 1
	else
		nDir = 4
	end
end

function turnTo(str)
	while dir[nDir] ~= str do
		if dir[nDir+1] == str then
			turnRight()
		elseif dir[nDir-1] == str then
			turnLeft()
		else
			turnRight()
		end
	end
end

function goTo(dx,dy)
	if x < dx then
		turnTo("+X")
	else
		turnTo("-X")
	end
	while x ~= dx do
		goFor()
	end
	if y < dy then
		turnTo("+Y")
	else
		turnTo("-Y")
	end
	while y ~= dy do
		goFor()
	end
	turnTo("+X")
end

function readSign()
	return sr.readUp()
end

function getItem()
	turnLeft()
	goFor()
	turtle.select(15)
	turtle.suckUp()
	turtle.select(16)
	turtle.suckUp()
	goFor()
	goUp()
	goUp()
	goBack()
	if turtle.getItemCount(16) == 1 then
		turtle.dropDown()
	else
		turtle.dropDown()
		turtle.select(15)
		turtle.dropDown()
	end
	goFor()
	goDown()
	goDown()
	goBack()
	goBack()
	turnRight()
end

getItem()