function count(name)
    local value = 0
    for i = 1,16 do
        local item = turtle.getItemDetail(i)
        if item and item.name == name then
            value = value + item.count
        end
        if item and item.name == "packages:package" then
            turtle.select(i)
            turtle.placeUp()
            sleep(.1)
            pack = peripheral.wrap("top")
            items = pack.list()
            for i,v in pairs(items) do
                if v.name == name then
                    value = value + v.count
                end
            end
            turtle.digUp()
        end
    end
    return value
end
function select(name)
    local flag = false
    for i = 1,16 do
        item = turtle.getItemDetail(i)
        if not item then
            flag = true
        end
        if item and item.name == name then
            turtle.select(i)
            return true
        end
    end
    for i = 1,16 do
        item = turtle.getItemDetail(i)
        if flag and item and item.name == "packages:package" then
            turtle.select(i)
            turtle.placeUp()
            sleep(0.1)
            items = peripheral.call("top","list")
            for i,v in pairs(items) do
                if v.name == name then
                    turtle.suckUp(64)
                    break
                end
            end
            turtle.digUp()
            for i = 1,16 do
                item = turtle.getItemDetail(i)
                if item and item.name == name then
                    turtle.select(i)
                    return true
                end
            end
        end
    end             
    print("no"..name.."found")
    return false
end
            
function pull(name, slot)
    slot = slot or turtle.getSelectedSlot()
    turtle.select(slot)
    i = 1
    item = turtle.getItemDetail(slot)
    while item and item.name~=name and i <=16 do
        turtle.transferTo(i)
        item = turtle.getItemDetail(slot)
        i = i+1  
    end
    local flag = false
    for i = 1,16 do
        item = turtle.getItemDetail(i)
        if item and item.name == name then
            turtle.select(i)
            turtle.transferTo(slot)
            flag = true
        end
    end
    turtle.select(slot)
    if flag then
        return turtle.getItemCount(slot)
    end
    return error("there is no '"..name.."' in my inventory")
end

return {pull=pull,count=count,select=select}