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holidays

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Application for finding which holidays fall on given dates.

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holidays lib holidays date_calculator weekend_modifier.ex
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lib/holidays/date_calculator/weekend_modifier.ex 

defmodule Holidays.DateCalculator.WeekendModifier do

  @doc """

  Move `date` to Monday if it occurs on a Saturday or Sunday.



  ## Examples



      iex> Holidays.DateCalculator.WeekendModifier.to_monday_if_weekend(~D[2015-12-05])

      ~D[2015-12-07]



      iex> Holidays.DateCalculator.WeekendModifier.to_monday_if_weekend(~D[2015-12-06])

      ~D[2015-12-07]



      iex> Holidays.DateCalculator.WeekendModifier.to_monday_if_weekend(~D[2015-12-08])

      ~D[2015-12-08]



  """

  def to_monday_if_weekend(date) do

    case Date.day_of_week(date) do

      6 -> Date.add(date, 2)

      7 -> Date.add(date, 1)

      _ -> date

    end

  end



  @doc """

  Move `date` to Monday if it occurs on a Sunday.



  ## Examples



      iex> Holidays.DateCalculator.WeekendModifier.to_monday_if_sunday(~D[2015-12-05])

      ~D[2015-12-05]



      iex> Holidays.DateCalculator.WeekendModifier.to_monday_if_sunday(~D[2015-12-06])

      ~D[2015-12-07]



      iex> Holidays.DateCalculator.WeekendModifier.to_monday_if_sunday(~D[2015-12-08])

      ~D[2015-12-08]



  """

  def to_monday_if_sunday(date) do

    case Date.day_of_week(date) do

      7 -> Date.add(date, 1)

      _ -> date

    end

  end



  # def to_weekday_if_boxing_weekend(date)



  # def to_weekday_if_boxing_weekend_from_year(year)



  @doc """

  Move `date` to Monday if it occurs on a Sunday or

  to Friday if it occurs on a Saturday.



  ## Examples



      iex> Holidays.DateCalculator.WeekendModifier.to_weekday_if_weekend(~D[2015-12-05])

      ~D[2015-12-04]



      iex> Holidays.DateCalculator.WeekendModifier.to_weekday_if_weekend(~D[2015-12-06])

      ~D[2015-12-07]



      iex> Holidays.DateCalculator.WeekendModifier.to_weekday_if_weekend(~D[2015-12-08])

      ~D[2015-12-08]



  """

  def to_weekday_if_weekend(date) do

    case Date.day_of_week(date) do

      7 -> Date.add(date, 1)

      6 -> Date.add(date, -1)

      _ -> date

    end

  end

end