holz

function selectItem(name)
    for i=1,16 do
        local data = turtle.getItemDetail(i)
        if data and data.name == ("minecraft:"..name) then
            turtle.select(i)
            return
        end
    end
end

function transferItemsToSlot(name, slot)
    for i=1,16 do
        local data = turtle.getItemDetail(i)
        if data and data.name == ("minecraft:"..name) then
            turtle.select(i)
            turtle.transferTo(slot)
        end
    end
end

function farm(count, farmingItem, skipFirstForward)
  for i=1,count do

    if not(skipFirstForward==true and i == 1) then
        turtle.forward()
    end
      -- Wenn kein Sapling bereits platziert ist, diesen platzieren
      local success, data = turtle.inspectDown()
      if not success then
        placeDownItem(farmingItem)
    elseif data.metadata == 7 then
      turtle.digDown()
      placeDownItem(farmingItem)
      end
  end
end

function placeDownItem(farmingItem)
  local data = turtle.getItemDetail()

  if not data or data.name ~= ("minecraft:"..farmingItem) then
    selectItem(farmingItem)
  end

  data = turtle.getItemDetail()

  if not data or data.name ~= ("minecraft:"..farmingItem) then
    return
  end

  turtle.placeDown()
end

function forwardX(x)
    for i=1,x do
        turtle.forward()
    end
end

function farmMultipleRows(rowLength, rowCount, farmingItem, skipFirstForward, lastRun)
    for i=1,rowCount do
        farm(rowLength, farmingItem, skipFirstForward)

        local left = i % 2 == 0

    if lastRun and i == rowCount then
      left = not left
    end

        if left then
            turtle.turnLeft()
        else
            turtle.turnRight()
        end
        turtle.forward()
    if i < rowCount then
          if left then
              turtle.turnLeft()
          else
              turtle.turnRight()
          end
    end
        skipFirstForward = true
    end
end

function farmTree(destroyOtherBlock)
  -- Nach vorne
  local success, data = turtle.inspect()
  if success and (data.name == "minecraft:log" or data.name == "minecraft:leaves") then
    turtle.dig()
    turtle.forward()
    farmTree(false)
    turtle.back()
    local itemdetail = turtle.getItemDetail()
    if itemdetail and itemdetail.name == "minecraft:sapling"  then
      turtle.place()
    end
  elseif destroyOtherBlock and not (success and data.name == "minecraft:sapling") then
    if success then
      turtle.dig()
    end
    local itemdetail = turtle.getItemDetail()
    if itemdetail and itemdetail.name == "minecraft:sapling"  then
      turtle.place()
    end
  end

  -- Nach oben
  local success, data = turtle.inspectUp()
  if success and (data.name == "minecraft:log" or data.name == "minecraft:leaves") then
    turtle.digUp()
    turtle.up()
    farmTree(false)
    turtle.down()
  end

  -- Nach links
  turtle.turnLeft()
  local success, data = turtle.inspect()
  if success and (data.name == "minecraft:log" or data.name == "minecraft:leaves") then
    turtle.dig()
    turtle.forward()
    farmTree(false)
    turtle.back()
  end

    -- Nach hinten
  turtle.turnLeft()
  local success, data = turtle.inspect()
  if success and (data.name == "minecraft:log" or data.name == "minecraft:leaves") then
    turtle.dig()
    turtle.forward()
    farmTree(false)
    turtle.back()
  end

  -- Nach rechts
  turtle.turnLeft()
  local success, data = turtle.inspect()
  if success and (data.name == "minecraft:log" or data.name == "minecraft:leaves") then
    turtle.dig()
    turtle.forward()
    farmTree(false)
    turtle.back()
  end

  -- grade stehen
  turtle.turnLeft()

  -- Nach unten
  local success, data = turtle.inspectDown()
  if success and (data.name == "minecraft:log" or data.name == "minecraft:leaves") then
    turtle.digDown()
    turtle.down()
    farmTree(false)
    turtle.up()
  end
end

function farmRow()
  turtle.turnLeft()
  farmTree(true)
  turtle.turnRight()
  turtle.turnRight()
  farmTree(true)
  turtle.turnLeft()
end

local rows = 12
while true do
  selectItem("sapling")
  forwardX(rows)
  farmRow()
  for i=1,rows do
    turtle.back()
    farmRow()
  end
  sleep(120)
end