Forward

fly = fly or 0
dig = dig or 0
arg = (...)
arg = tonumber(arg) or 1
x = 0
while x < arg do

 if tog == 1 then
  turtle.dig()
 end

 if fly == 1 then
  turtle.forward()
  x = x + 1
 end

 while fly == 0 and turtle.detect() == true do
  turtle.up()
 end

 if fly == 0 then
  turtle.forward()
  x = x + 1
 end

 while fly == 0 and turtle.detectDown() == false do
  turtle.down()
 end

end