Branches

args = {...}
dir = "not"

function checkinv()
  if turtle.getItemCount(15) > 0 then
    turtle.select(1)
    turtle.turnRight()
    turtle.turnRight()
    turtle.place()
    for i = 2, 15 do
      turtle.select(i)
      while not turtle.drop() do
        os.sleep(1)
      end
    end
    turtle.select(1)
    turtle.dig()
    turtle.turnRight()
    turtle.turnRight()
    turtle.select(16)
  end
end

function forward(aantal, down, up)
  for i = 1, aantal do
    turtle.dig()
    while not turtle.forward() do
      os.sleep(1)
      turtle.dig()
    end
    if down then
      turtle.digDown()
    end
    if up then
      turtle.digUp()
    end
  end
  if down then
    checkinv()
  end
end

function back()
  while not turtle.back() do
    os.sleep(1)
  end
end

function branch()
  turtle.select(16)
  for i = 1, 20 do
    forward(4,true,false)
    if i%2 == 0 then
      turtle.placeDown()
    end
    turtle.turnRight()
    forward(5,false,false)
    for j = 1, 5 do
      back()
    end
     turtle.turnLeft()
  end

  turtle.turnLeft()
  forward(6,false,false)
  for i = 1, 5 do
    back()
  end
  turtle.digDown()
  turtle.turnLeft()

  for i = 1, 19 do
    forward(4,true,false)
    if i%2 == 0 then
      turtle.placeDown()
    end
    turtle.turnRight()
    forward(5,false,false)
    for j = 1, 5 do
      back()
    end
    turtle.turnLeft()
  end
  forward(4,true,false)
end

if (args[1] == "left") then
  dir = "left"
elseif (args[1] == "right") then
  dir = "right"
end
if (dir ~= "not") and ( 0 < tonumber(args[2]) and tonumber(args[2]) < 4 ) then
  while turtle.getFuelLevel() < (700*(tonumber(args[2]))) do
    term.clear()
    term.setCursorPos(1,1)
    print("You need to refuel, put coal in slot 2")
    io.read()
    turtle.select(2)
    turtle.refuel()
  end
  while turtle.getItemCount(16) < (20*(tonumber(args[2]))) do
    term.clear()
    term.setCursorPos(1,1)
    print("You need to put "..(20*(tonumber(args[2]))).." torches in slot 16")
    io.read()
  end
  while turtle.getItemCount(1) < 1 do
    term.clear()
    term.setCursorPos(1,1)
    print("You need to put 1 enderchest in slot 1")
    io.read()
  end

  for i = 1 , tonumber(args[2]) do
    branch()
    turtle.digUp()
    if ( dir == "left") then
      turtle.turnRight()
    else
      turtle.turnLeft()
      forward(1,true,true)
    end
    forward(13,true,true)
    turtle.select(16)
    turtle.placeUp()
    if ( dir == "left") then
      turtle.turnRight()
    else
      forward(1,true,true)
      turtle.turnLeft()
    end
  end
end