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Dynamic (multi)selection field for LiveView

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live_select lib live_select class_util.ex
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lib/live_select/class_util.ex 

defmodule LiveSelect.ClassUtil do

  @moduledoc false



  @doc ~S"""

  iex> extend(~W(bg-white text-yellow), ~W(p-2))

  ~W(bg-white text-yellow p-2)



  iex> extend(~W(bg-white text-yellow), ~W(bg-white))

  ~W(bg-white text-yellow)



  iex> extend(~W(bg-white text-yellow), ~W(!text-yellow text-black))

  ~W(bg-white text-black)



  iex> extend(~W(bg-white text-yellow), ~W(!text-yellow text-black !bg-white))

  ~W(text-black)



  iex> extend(~W(bg-white text-yellow), ~W(!text-yellow !bg-white))

  []



  iex> extend(~W(bg-white text-yellow), [])

  ~W(bg-white text-yellow)



  iex> extend([], [])

  []

  """

  @spec extend([String.t()], [String.t()]) :: [String.t()]

  def extend(base, extend) when is_list(base) and is_list(extend) do

    base_classes =

      Enum.uniq(base)

      |> Enum.filter(& &1)



    {remove, add} =

      extend

      |> Enum.filter(& &1)

      |> Enum.split_with(&String.starts_with?(&1, "!"))



    add =

      add

      |> Enum.reject(&(&1 in base_classes))

      |> Enum.uniq()



    remove =

      remove

      |> Enum.map(&String.trim_leading(&1, "!"))

      |> Enum.uniq()



    (base_classes -- remove) ++ add

  end

end