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Cocktail is a date/time recurrence library for Elixir based on iCalendar events. It can generate a stream of dates/times based on a set of repeat rules.

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cocktail lib cocktail validation shift.ex
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lib/cocktail/validation/shift.ex 

defmodule Cocktail.Validation.Shift do

  @moduledoc false



  @type change_type :: :no_change | :updated



  @type result :: {change_type, Cocktail.time()}



  @typep shift_type :: :months | :days | :hours | :minutes | :seconds



  @typep option :: nil | :beginning_of_day | :beginning_of_hour | :beginning_of_minute



  import Cocktail.Util



  @spec shift_by(integer, shift_type, Cocktail.time(), option) :: result

  def shift_by(amount, type, time, option \\ nil)

  def shift_by(0, _, time, _), do: {:no_change, time}



  def shift_by(amount, type, time, option) do

    new_time =

      time

      |> shift_time("#{type}": amount)

      |> apply_option(option)



    {:change, new_time}

  end



  @spec apply_option(Cocktail.time(), option) :: Cocktail.time()

  defp apply_option(time, nil), do: time

  defp apply_option(time, :beginning_of_day), do: time |> beginning_of_day()

  defp apply_option(time, :beginning_of_hour), do: %{time | minute: 0, second: 0, microsecond: {0, 0}}

  defp apply_option(time, :beginning_of_minute), do: %{time | second: 0, microsecond: {0, 0}}

end