north = 1
south = 2
west = 3
east = 4

northDir = {0, 1}
southDir = {0, -1}
eastDir = {1, 0}
westDir = {-1, 0}

-- start at facing north
currentDir = north

function faceEast()
    if(currentDir == north) then
	    turtle.turnRight()
    elseif(currentDir == west) then
	    turtle.turnRight()
		turtle.turnRight()
    elseif(currentDir == south) then
	    turtle.turnLeft()
	end
	currentDir = east;
end

function faceNorth()
    if(currentDir == east) then
	    turtle.turnLeft()
    elseif(currentDir == south) then
	    turtle.turnRight()
		turtle.turnRight()
    elseif(currentDir == west) then
	    turtle.turnRight()
	end
	currentDir = north;
end

function faceSouth()
    if(currentDir == east) then
	    turtle.turnRight()
    elseif(currentDir == north) then
	    turtle.turnRight()
		turtle.turnRight()
    elseif(currentDir == west) then
	    turtle.turnLeft()
	end
	currentDir = south;
end

function faceWest()
    if(currentDir == south) then
	    turtle.turnRight()
    elseif(currentDir == east) then
	    turtle.turnRight()
		turtle.turnRight()
    elseif(currentDir == north) then
	    turtle.turnLeft()
	end
	currentDir = west;
end

turtle.refuel()

faceNorth()
turtle.forward()
faceEast()
turtle.forward()
faceWest()
turtle.forward()
faceSouth()
turtle.forward()