Simple destruction

--[[
simple TNT carpet-bombing program (carpetbomb)
by Kazagistar
Do whatever you want with it, no rights reserved, as per WTFPL
(http://sam.zoy.org/wtfpl/COPYING)
]]--


local x, y, density, rounds = ...
assert(x and y and density and rounds, "carpetbomb <xSize> <ySize> [density=4] [rounds=1]")
density=tonumber(density or 4)
rounds=tonumber(rounds or 1)
x=math.floor(tonumber(x)/density)
y=math.floor(tonumber(y)/density)

assert(turtle.getFuelLevel()=="unlimited" or turtle.getFuelLevel() >= (y+1)*x*density*rounds, "I need juice!")
local sum = 0
for i=1,16 do sum=sum+turtle.getItemCount(i) end
assert(sum >= x*y*rounds, "Gimme moar stuff to drop!")

print("Teeheeheehee >:D/>/>/>")

local current = 1
local function drop()
	if turtle.getItemCount(current) == 0 then
		current = current + 1
		assert(current <= 16, "Ran out of boom boom :(/>/>/>")
		return drop()
	end
	turtle.select(current)
	turtle.placeDown()
	rs.setOutput("bottom", true)
	sleep(0)
end
local function forward(distance)
	while distance > 0 do
		turtle.forward()
		distance = distance - 1
	end
end

local left = false
for k=1,rounds do
	for i=1,x do
		drop()
		for j=1,y do
			forward(density)
			drop()
		end
		if i==x then break end
		if left then
			turtle.turnLeft()
			forward(density)
			turtle.turnLeft()
			left = false
		else
			turtle.turnRight()
			forward(density)
			turtle.turnRight()
			left = true
		end
	end
	turtle.turnLeft()
	turtle.turnLeft()
end