With vs Pipes

with_or_pipe.ex

defmodule ArticleBuilder do
  def generate_content(topic) do
    initial_messages = [
      %{role: :system, content: "You are an expert at crafting SEO friendly blog articles"}
    ]

    with {:outline, {:ok, _outline, outline_messages}} <-
           {:outline, create_outline(initial_messages, topic)},
         {:article, {:ok, article, _article_messages}} <-
           {:article, create_article(outline_messages)},
         {:translation, {:ok, translated_article, _translated_messages}} <-
           {:translation, translate_to(article, "german")} do
      {article, translated_article}
    else
      {stage, {:error, _err}} -> "Error in stage #{stage}"
    end
  end

  # ...
end

defmodule ArticleBuilder do
  def generate_content(topic) do
    initial_messages = [
      %{role: :system, content: "You are an expert at crafting SEO friendly blog articles"}
    ]

    initial_messages
    |> create_outline(topic)
    |> do_create_article()
    |> do_translate_to("german")
  end

  defp do_create_article({:outline, {:error, _msn} = err), do: {:outline, err}
  defp do_create_article({:outline, {:ok, _outline, outline_messages}}) do
    create_article(outline_messages)
  end

  defp do_translate_to({:article, {:error, _msg} = err}), do: {:article, err}
  defp do_translate_to({:article, {:ok, article, _article_messages}}, lang) do
    translate_to(artigle, lang)
  end

  # ...
end