Bridge v1.0

-- 3 wide Bridge v1.0 by SparkVGX

--Var
continue = true
lane = 1
distance = 0
tLeft = false
blocksPlaced = 0
Fuel = 1

function bForward()
  if turtle.detect() == true then
    turtle.dig()
    turtle.forward()
  end
  else
    turtle.forward()
  end
end

function checkFuel()
 if turtle.getFuelLevel() <= 5 then
   turtle.select(1) --fuel goes in this slot
   turtle.refuel(1)
 end
end

function selectBlock()
  for sBlock=2,13 do
     if turtle.getItemCount(sBlock)~=0 then
       turtle.select(sBlock)
       break
     end
  end
end

--Place down
function pDown()
  selectBlock()
  if turtle.detectDown() == false then
   if turtle.placeDown() == false then
     print("Need blocks")
     sleep(5)
     pDown()
    end
    blocksPlaced = blocksPlaced + 1
    print(blocksPlaced)
  end
end

function turn()
  if tLeft then
    turtle.turnLeft()
    bForward()
    turtle.turnLeft()
  end
  if tLeft == false then
    turtle.turnRight()
    bForward()
    turtle.turnRight()
  end
  tLeft = not tLeft
end

function Lane()
  if lane == 1 then
    while turtle.detect() == false do
      pDown()
      checkFuel()
      turtle.forward()
      distance = distance + 1
      lane = lane + 1
    end
  end
  if lane ~= 1 then
    for i=1,distance do
      pDown()
      checkFuel()
      bForward()
      pDown()
    end
  end
end

function goHome()
  turtle.turnLeft()
  turtle.forward()
  turtle.forward()
  turtle.turnLeft()

  for i=1,distance do
    turtle.forward()
  end
end


Lane()
turn()
Lane()
turn()
Lane()
goHome()