wall

local argv = { ... }

argv[1] = tonumber(argv[1])
argv[2] = tonumber(argv[2])

if argv[1] < 0 or argv[2] < 0 or argv[1] == null then
  print("You must specify a length and width.")
  sleep(5)
  restart()
end

function fw()
  while not turtle.forward() do
    sleep(0)
    turtle.dig()
  end
end

function up()
  while not turtle.up() do
    sleep(0)
    turtle.digUp()
  end
end

function pd()
  while turtle.placeDown() == false do
    sleep(0)
    if turtle.select(turtle.getSelectedSlot() + 1) then
    else
      print("Waiting for blocks...")
      turtle.select(1)
      while turtle.getItemCount() < 1 do
        sleep(5)
      end
    end
  end
end


print("Building a wall of size " .. argv[1] .. " by " .. argv[2] .. ".")

function buildRow()
  up()
  for j = 1,argv[1],2 do
    pd()
    fw()
    pd()
    fw()
  end
  if argv[1] % 2 == 1 then
    pd()
    fw()
  end
  turtle.turnRight()
  turtle.turnRight()
  pd()
end

for i = 1,argv[2],2 do
  buildRow()
end

if argv[2] == 1 then
  buildRow()
  for t = 1,argv[1] do
    fw()
  end
  for u = 1,argv[2] do
    turtle.down()
  end
else
  turtle.turnRight()
  turtle.turnRight()
  fw()
  for v = 1,argv[2] do
    turtle.down()
  end
end

print("Done building!")
print("Congratulations on your presidency, Trump.")