Cylinder

-- Inventory Slot Variable
local p = 2
-- Repeat variable for up one level + full circle
local o = 1
-- Repeat variable for one quarter of a circle
local i = 1


-- consumes initial fuel, then selects slot 2, and turns on wifi
turtle.refuel(1)
turtle.select(2)

-- Function to get the number of items in a given slot
bcount = function()
        return turtle.getItemCount(p)
end

-- Function to get the fuel level of the robot
fcount = function()
	return turtle.getFuelLevel()
end

--[[ All in one check and fix function - it checks for empty item slots and moves
     slot over when needed, and it checks for fuel level, and refules when needed
--]]
check = function()
	if bcount() < 1 then
		p = p + 1
		turtle.select(p)
	end
	print ("My current fuel level is " .. fcount())
	if fcount() < 1 then
		print ("Attempting to eat my fuel...")
		if turtle.getItemCount(1) < 1 then
			print ("I am out of fuel...")
			o = 0
		end
		turtle.select(1)
		turtle.refuel(1)
		turtle.select(p)
	end
end

--[[ Basic right corner, it really just moves the turtle like so:
									  -->-->
									       |
											-->-->
--]]
rCorner = function()
	turtle.turnRight()
	turtle.forward()
	turtle.turnLeft()
end

--[[ Basic left corner, it really just moves the turtle like so:
											 -->-->
											|
									  -->-->
--]]
lCorner = function()
	turtle.turnLeft()
	turtle.forward()
	turtle.turnRight()
end

-- Function for Place block down, and move forward, very common movement.
pfmove = function()
	turtle.placeDown()
	turtle.forward()
	check()
end

--[[ Main code loop for creating a tower, it will continue until it runs out of
blocks or runs out of fuel (if it does run out of blocks, it will still move up
until it runs out of fuel)
--]]
repeat
	turtle.up()
	print("Attempting to build next level")
	repeat
		for t=1,5 do
			pfmove()
		end
		rCorner()
		for t=1,2 do
			pfmove()
		end
		rCorner()
		pfmove()
		turtle.turnRight()
		for t=1, 2 do
			turtle.forward()
			turtle.placeDown()
			check()
		end
		lCorner()
		turtle.forward()
		i = i + 1
	until i == 5
	i = 1
until o == 0