--[[Function Module program by Al Sweigart
Provides useful utility functions.]]

-- selectItem() selects the inventory
-- slot with the named item, returns
-- true if found and false if not
function selectItem(name)
-- check all inventory slots
 local item
  for slot = 1, 16 do
    item = turtle.getItemDetail(slot)
    if item ~= nil and item['name'] == name then
      turtle.select(slot)
      return true
    end
  end

  return false  -- couldn't find item
end


-- selectEmptySlot() selects inventory
-- slot that is empty, returns true if
-- found, false if no empty spaces
function selectEmptySlot()

  -- loop through all slots
  for slot = 1, 16 do  
    if turtle.getItemCount(slot) == 0 then
      turtle.select(slot)
      return true
    end
  end
  return false -- couldn't find empty space
end

-- getItemFromChest(chestItem) selects
-- something from a chest in front of the turtle
-- and pushes it into the turtle.
function getItemFromChest(chestItem)
    sapling = peripheral.wrap('front') -- This find the chest at the front and allow you do things to it
    selectEmptySlot()

    for slot, item in pairs(sapling.getAllStacks()) do
        if item.id == chestItem then
	    -- If the chest is on the north side of the turtle, the turtle is on the south side of the peripheral
	    sapling.pushItem('south', slot)
	end
    end
end