defmodule Mercury.Cleaners.Author do
  import Mercury.Utils.Text, only: [normalize_spaces: 1]

  @clean_author ~r/^\s*(posted |written )?by\s*:?\s*(.*)/i

  @doc """
  Take an author string (like 'by David Smith ') and clean it to just the name.

  ## Examples

      iex> Mercury.Cleaners.Author.clean_author("by David Smith")
      "David Smith"
  """
  def clean_author(author) do
    Regex.replace(@clean_author, normalize_spaces(author), "\\2")
    |> String.trim()
  end
end