Turtle Brancher

-- declare stuff

local args = { ... }

if not args[1] then return end

-- anti gravel

local function antiGravel()
  while turtle.detect() do
    turtle.dig()
  end
end

local backTrack = 0

-- system to track movement, to return to home

local t = {
  forward = function()
    turtle.forward()
    backTrack = backTrack + 1
  end,
  dig = function()
    turtle.dig()
    antiGravel()
  end
}

-- mine

if term.isColor() then term.setTextColor(colors.blue) end

print("Starting dig!")

for i = 1, args[1] - 1 do
  t.dig()
  turtle.up()
  t.dig()
  t.forward()
  t.dig()
  turtle.down()
  t.dig()
  t.forward()
  if i % 3 == 0 then
    turtle.turnRight()
    turtle.up()
    turtle.dig()
    turtle.select(16)
    turtle.place()
    turtle.turnLeft()
    turtle.down()
  end
end

--turn back around

print("Turning around and going home.")

for i = 1, 2 do
  turtle.turnLeft()
end

-- go home

local function goHome()
  for i = 1, backTrack do
      print(backTrack - i)
      shell.run("go", "forward", backTrack)
  end

  -- turn back around

  for i = 1, 2 do
    turtle.turnRight()
  end
end

goHome()

print("Finished.")