testit

local positionX=0
local positionY=0
local positionZ=0
right="right"
left="left"
up="up"
down="down"
forward="forward"
back="back"

function doMove(direction,distance)

	-- set defaults
	if (distance==nil) then distance = 1 end
	if (distance==0) then return end
	direction=direction or "none"

	--fix negative distances
	if (distance<0) then
		distance=distance * -1
		if (direction==right) then direction=left
		elseif (direction==left) then direction=right
		elseif (direction==forward) then direction=back
		elseif (direction==back) then direction=forward
		elseif (direction==up) then direction=down
		elseif (direction==down) then direction=up
		end
	end

	-- increase or decrease position with increment
	if ((direction==right) or (direction==up) or (direction==forward)) then
		increment=1
	else
		increment=-1
	end

	--always face forward so that suck works
	--set temporary location to update
	if (direction==right) then
		tmpLocation=positionX
		turtle.turnRight()
	elseif (direction==left) then
		tmpLocation=positionX
		turtle.turnLeft()
	elseif (direction==back) then
		turtle.turnLeft()
		turtle.turnLeft()
		tmpLocation=positionY
	elseif (direction==forward) then
		tmpLocation=positionY
	elseif ((direction==up) or (direction==down)) then
		tmpLocation=positionZ
	else
		print("unknown direction: "..direction)
		return
	end

	--move and update position
	if (direction==up) then
		for d=1,distance do
			turtle.suckUp()
			if turtle.up() then tmpLocation=tmpLocation+increment end
		end
	elseif (direction==down) then
		for d=1,distance do
			turtle.suckDown()
			if turtle.down() then tmpLocation=tmpLocation+increment end
		end
	else
		for d=1,distance do
			turtle.suck()
			if turtle.forward() then tmpLocation=tmpLocation+increment end
		end
	end

	--set the globalposition and face correct direction
	if (direction==right) then
		positionX=tmpLocation
		turtle.turnLeft()
	elseif (direction==left) then
		positionX=tmpLocation
		turtle.turnRight()
	elseif (direction==back) then
		positionY=tmpLocation
		turtle.turnLeft()
		turtle.turnLeft()
	elseif (direction==forward) then
		positionY=tmpLocation
	elseif ((direction==up) or (direction==down)) then
		positionZ=tmpLocation
	end


end

print("X: "..positionX..", Y: "..positionY..", Z: "..positionZ)
print(right)
doMove(left,-2)
sleep(2)
print(left)
doMove(right,-2)
sleep(2)
print(up)
doMove(down,-2)
sleep(2)
print(down)
doMove(up,-2)
sleep(2)
print(forward)
doMove(back,-2)
sleep(2)
print(back)
doMove(forward,-2)
print("done")