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primer_live

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An implementation of GitHub's Primer Design System for Phoenix LiveView.

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primer_live lib helpers component_helpers.ex
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lib/helpers/component_helpers.ex 

defmodule PrimerLive.Helpers.ComponentHelpers do

  @moduledoc false



  @doc ~S"""

  Returns nil if the rendered slot has no content, otherwise returns the rendered content.

  This is useful for providing fallback content in case a slot inner_block exists, but the rendered result may be empty.



  Usage in a template:



  ```

  <%= render_slot(my_slot) |> ComponentHelpers.maybe_slot_content() || "Fallback" %>

  ```



      iex> PrimerLive.Helpers.ComponentHelpers.maybe_slot_content(%Phoenix.LiveView.Rendered{

      ...>   static: [""]

      ...> })

      nil



      iex> PrimerLive.Helpers.ComponentHelpers.maybe_slot_content(%Phoenix.LiveView.Rendered{

      ...>   static: [" \n  \n "]

      ...> })

      nil



      iex> PrimerLive.Helpers.ComponentHelpers.maybe_slot_content(%Phoenix.LiveView.Rendered{

      ...>   static: [" \n Content \n "]

      ...> })

      %Phoenix.LiveView.Rendered{static: [" \n Content \n "], dynamic: nil, fingerprint: nil, root: nil, caller: :not_available}

  """

  def maybe_slot_content(rendered) do

    case has_slot_content(rendered) do

      true -> rendered

      false -> nil

    end

  end



  defp has_slot_content(rendered), do: !is_empty_slot(rendered)

  defp is_empty_slot(rendered) when is_nil(rendered), do: false

  defp is_empty_slot(rendered), do: is_empty_slot_content(rendered.static)

  defp is_empty_slot_content(static) when is_nil(static), do: true

  defp is_empty_slot_content(static) when static == [""], do: true



  defp is_empty_slot_content(static) do

    cond do

      Enum.count(static) === 0 -> true

      hd(static) |> String.trim() == "" -> true

      true -> false

    end

  end

end