[CC] spiral floor builder

if not turtle then
    printError( "Requires a Turtle" )
    return
end

local tArgs = { ... }
if #tArgs ~= 3 then
    print( "Usage: sfb <length> <width> <material>" )
    return
end

-- Mine in a quarry pattern until we hit something we can't dig
local length = tonumber( tArgs[1] )
local width = tonumber( tArgs[2] )
local material = tArgs[3]

if length < 1 then
    print( "Floor length must be natural number" )
    return
end

if width < 1 then
    print( "Floor width must be natural number" )
    return
end

local depth = 0
local item = 1

local function count()
    length = length + 1
    if math.fmod(length, 10) == 0 then
        print( "Faced "..length.." section." )
    end
end

local function tryDig()
    while turtle.detect() do
        if turtle.dig() then
            sleep(0.1)
        else
            return false
        end
    end
    return true
end

local function refuel()
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel == "unlimited" or fuelLevel > 0 then
        return
    end

    local function tryRefuel()
        for n=1,16 do
            if turtle.getItemCount(n) > 0 then
                turtle.select(n)
                if turtle.refuel(1) then
                    turtle.select(1)
                    return true
                end
            end
        end
        turtle.select(1)
        return false
    end

    if not tryRefuel() then
        print( "Add more fuel to continue." )
        while not tryRefuel() do
            os.pullEvent( "turtle_inventory" )
        end
        print( "Resuming floor building..." )
    end
end

local function charge()
    local function tryCharge()
        for n=1,16 do
            if turtle.getItemCount(n) > 0 then
                if turtle.getItemDetail(n).name == material then
                    turtle.select(n)
                    return true
                end
            end
        end
        turtle.select(2)
        return false
    end
    if not tryCharge() then
        print( "Add more material to continue." )
        while not tryCharge() do
            os.pullEvent( "turtle_inventory" )
        end
        print( "Resuming floor building..." )
    end
end

local function tryForward()
    refuel()
    while not turtle.forward() do
        if turtle.detect() then
            if not tryDig() then
                return false
            end
        elseif turtle.attack() then
        else
            sleep( 0.1 )
        end
    end
    return true
end

local function tryPlaceDown()
    refuel()
    charge()
    while not turtle.detectDown() do
        if turtle.placeDown() then
            sleep(0.1)
        else
            return false
        end
    end
    return true
end

print( "Building the floor..." )

local function buildForward(dir)
	for n=1,dir do
		tryForward()
		tryPlaceDown()
	end
end

local frwDir = true;

while (length > 0 or width > 0) do
	if frwDir == true then
		buildForward(length)
		width = width - 1
		frwDir = false
	else
		buildForward(width)
		length = length- 1
		frwDir = true
	end
	turtle.turnRight()
end

print( "Floor building complete" )