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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("bg-white text-yellow", "p-2")

  "bg-white text-yellow p-2"



  iex> extend("bg-white text-yellow", "bg-white")

  "bg-white text-yellow"



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

  "bg-white text-black"



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

  "text-black"



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

  ""



  iex> extend("bg-white text-yellow", "")

  "bg-white text-yellow"



  iex> extend("", "")

  ""

  """

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

  def extend(base, extend) do

    base_classes =

      String.split(base)

      |> Enum.uniq()



    {remove, add} =

      extend

      |> String.split()

      |> 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)

    |> Enum.join(" ")

  end

end