botania_petal_grower.lua

---select the first non empty slot that is not bone_meal
---@return boolean
local function first_not_bone_meal()
  local i = 1
  while i <= 16 and
    (turtle.getItemCount(i) == 0 or turtle.getItemDetail(i).name ==
      "minecraft:bone_meal") do
    i = i + 1
  end
  if i <= 16 then
    turtle.select(i)
  end
  return i <= 16
end

---select the first slot with item
---@return boolean
local function select_slot_with(item_name)
  local i = 1
  while i <= 16 and
    (turtle.getItemCount(i) == 0 or turtle.getItemDetail(i).name ~= item_name) do
    i = i + 1
  end
  if i <= 16 then
    turtle.select(i)
  end
  return i <= 16
end

---@return string
local function front_block_name()
  local here, b = turtle.inspect()
  if here then
    if type(b) == type({}) then
      b = b.name
    end
    return b
  end
end

local activation_side = "right"

while first_not_bone_meal() do
  turtle.place()
  assert(select_slot_with("minecraft:bone_meal"), "no more bone meal!")
  turtle.place()
  local placed_block = front_block_name()
  redstone.setOutput(activation_side, true)
  while placed_block == front_block_name() do
    sleep(0.02)
  end
  redstone.setOutput(activation_side, false)
end

print("No more item to process")
print("Exiting")