site.ex

defmodule Pince.Site do
  @moduledoc """
  Coordinates website creation
  """

  def process(options) do
    options |> check
  end

  defp check(options) do
    check_existence([
      Path.expand(options[:from]),
      Path.join(Path.expand(options[:from]), "_site") ])
  end

  defp check_existence([]) do
    []
  end

  defp check_existence([head | tail]) do
    if !File.exists?(head), do: raise(RuntimeError, "#{head} does not exist")
    check_existence(tail)
  end
end