Digger

--name Digger
--version 1.0a
local version = "1.0a"

local args = {...}
local limX, limY

local function forward()
	while not turtle.forward() do
		turtle.dig()
	end
end

local function screen(txt)
	term.clear()
	term.setCursorPos(1,1)
	print("Digger (v%s)",version)
	print("------------------")
	print(txt)
end

local function turn(x,z)
	if x == limX then
		if z%2 == 0 then
			turtle.turnLeft()
		else
			turtle.turnRight()
		end
	elseif (x == 1) and (z ~= 1) then
		if z%2 == 1 then
			turtle.turnLeft()
		else
			turtle.turnRight()
		end
	end
end

if #args ~= 2 then
	print("Usage:  Digger [x] [z]")
else
	limX = tonumber(args[1])
	limZ = tonumber(args[2])
	for z=1,limZ do
		for x=1,limX do
			screen(string.format("X:%d Z:%d",x,z))
			turtle.digUp()
			turtle.digDown()
			turn(x,z)
			if(x<limX) or (z<limZ) then
				forward()
			end
		end
	end
end