track4

local REG_TRACK_COUNT = 37
local POWER_TRACK_COUNT = 1
local RT_COUNT = 1
local rt = 1
local pt = 2
local totalDistance = 0
local PR = "minecraft:powered_rail"
local RR = "minecraft:rail"
local RT = "minecraft:redstone_torch"

if #arg == 1 then
    totalDistance = tonumber(arg[1])
else
    print("Please give total count of track iterations to lay so I don't go on forever.")
end

function layBlock(blockType, blockCount)
    local curSlot = nextSlot(blockType)
    if curSlot ~= false then
        turtle.select(curSlot)
    else
        return false
    end
    for i = 1, blockCount do
        local checkStatus = checkFront()
        print(checkStatus)
        if checkStatus ~= false then
            if checkStatus == "minecraft:wall_torch" then
                print("Torch detected.")
            else
                print("Block in the way")
                return false
            end
        else
            turtle.forward()
            if slotCount(curSlot) < 0 then
                if turtle.compareDown() then
                    print(blockType, " already here")
                else
                    turtle.placeDown(1)
                end
            else
                curSlot = nextSlot(blockType)
                if curSlot ~= false then
                    turtle.select(curSlot)
                    if turtle.compareDown() then
                        print(blockType, " already here")
                    else
                        turtle.placeDown(1)
                    end
                else
                    if turtle.compareDown() then
                        print(blockType, " already here")
                    else
                        return false
                    end
                end
            end
        end
    end
    return true
end

function slotCount(s)
        turtle.select(s)
        return turtle.getItemCount(s)
end

function nextSlot(t)
    print(t)
    for i = 1, 16 do
        if turtle.getItemCount(i) > 0 then
            if turtle.getItemDetail(i)["name"] == t then
                return i
            end
        end
    end
    return false
end

function checkFront()
    local success, data = turtle.inspect()
    if success then
        return data.name
    else
        return false
    end
end

function redTorch()
    local retVal = false
    turtle.turnLeft()
    if layBlock(RT, RT_COUNT) == true then
        retVal = true
    end
    turtle.back()
    turtle.turnRight()
    return retVal
end

turtle.up()
for i=1, totalDistance do
    if layBlock(RR, REG_TRACK_COUNT) == true then
        --print("Layed reg track set.")
        if layBlock(PR, POWER_TRACK_COUNT) == true then
            --print("Layed power track set.")
            if redTorch() == true then
                print("Layed a red stone torch.")
            else
                print("Red stone torch error.")
            end
        else
            print("Power track error.")
        end
    else
        print("Reg track error.")
    end
end