test

x=0 --R/L
y=0 --U/D
z=0 --fwd/bck
rot=0

function rotate(direction)
	if rot==0 and direction == 3 then
		rot=4
	end
	if rot==3 and direction == 0 then
		rot=-1
	end
	while rot<direction do rot = rot+1 	turtle.turnRight() end
	while rot>direction do rot = rot-1 	turtle.turnLeft() end
end

function move(direction,dist)
	rotate(direction)
	while dist>0 do
		while not turtle.forward() do os.sleep(1) end
		dist = dist-1
		if rot == 0 then z = z+1 end
		if rot == 1 then x = x+1 end
		if rot == 2 then z = z-1 end
		if rot == 3 then x = x-1 end
	end
end

function moveV(dist)
	while dist>0 do
		if not turtle.up() then return false end
		dist = dist-1
		y = y+1
	end
	while dist<0 do
		if not turtle.down() then return false end
		dist = dist+1
		y = y-1
	end
	return true
end

function moveTo(tx,ty,tz)
	r=0
	if z<tz then r=0 else r=2 end
	d = math.abs(tz-z)
	move(r,d)
	if x<tx then r=1 else r=3 end
	d = math.abs(tx-x)
	move(r,d)
	moveV(ty-y)
end

function khuyam()
	--[[if 	turtle.detectUp() then
		turtle.digUp()
		moveV(1)
		khuyam()
		moveV(-1)
	end
	dirs = {0,1,3,2}
	for i=0,3 do
		rotate(dirs[i+1])
		if 	turtle.detect() then
			turtle.dig()
			move(dirs[i+1],1)
			khuyam()
			move(dirs[i+1]+2%4,1)
		end
	end
	--]]
end

rowLen=4
colLen=2

moveTo(0,0,3)
turtle.select(1)
for j=0,(colLen-1) do
	moveTo(-3*j-1,0,3)
	for i=0,(rowLen-1) do
		moveTo(-1-3*j,0,4+3*i)
		rotate(3)
		if not	turtle.detect() then
			turtle.place()
		else
			repr = moveV(1)
			if turtle.detect() or repr==false then
				shell.run("chop")
				if repr then
					moveV(-1)
				end
				rotate(3)
				turtle.dig()
				turtle.place()
			else
				moveV(-1)
			end
		end
	end
	moveTo(-3*j-1,0,3)
end
moveTo(0,0,0)
rotate(0)
print("X: "..x)
print("Y: "..y)
print("Z: "..z)
for i=2,16 do
	turtle.select(i)
	turtle.dropDown()
end