gauRailer v0.2

local railEnd = 4
local brickEnd = 8

local currentRail = 1
local currentBrick = railEnd+1

function DigIt()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.dig()
    turtle.turnRight()
    turtle.turnRight()
end

function placeBrick()
    turtle.select(currentBrick)
    turtle.placeDown()
    if ( turtle.getItemCount(currentBrick) <= 0 ) then
        currentBrick = currentBrick + 1
    end
end

function placeTrack()
    turtle.select(currentRail)
    turtle.place()
    if ( turtle.getItemCount(currentRail) <= 0 ) then
        currentRail = currentRail + 1
    end
end

function LayTrack()
    if ( not turtle.back() ) then
        DigIt()
    end
    turtle.digDown()
    placeBrick()
    placeTrack()
end

function countBlocks()
    local tracks = 0
    local bricks = 0
    for slot = 1,railEnd do
        tracks = tracks + turtle.getItemCount(slot)
    end
    for slot = railEnd+1,brickEnd do
        bricks = bricks + turtle.getItemCount(slot)
    end
    return math.min(bricks,tracks)

end


local distance = countBlocks()

for x=1,distance do
    LayTrack()

end