place.lua

local tArgs = { ... }
if #tArgs ~= 1 then
    print( "Usage: place <cycle_amount>" )
    return
end

local cycle_len = tonumber(tArgs[1])

local function refuel(amount)
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel == "unlimited" then
        return true
    end

    if turtle.getFuelLevel() < amount then
        local fueled = false
        turtle.select(16)
        if turtle.getItemCount(16) > 0 then
            turtle.select(16)
            if turtle.refuel(1) then
                while turtle.getItemCount(16) > 0 and turtle.getFuelLevel() < amount do
                    turtle.refuel(1)
                end
                if turtle.getFuelLevel() >= amount then
                    turtle.select(1)
                    return true
                end
            end
        end
        turtle.select(1)
        return false
    end

    return true
end

local function wait_for_items()
    while turtle.getItemCount() == 0 do
        os.pullEvent( "turtle_inventory")
    end
end

local function assert_items()
    if turtle.getItemCount() == 0 then
        print("No more items")
        wait_for_items()
    end
end

local function cycle()
    for n=1,cycle_len do
        turtle.select(n)
        assert_items()
        turtle.place()

        refuel(1)
        turtle.back()
    end
end

local function main()
    while true do
        cycle()
    end
end

main()