Simple module to randomly generate bible verses

bible.yaml

---
gn: [31, 25, 24, 26, 32, 22, 24, 22, 29, 32, 32, 20, 18, 24, 21, 16, 27, 33, 38, 18, 34, 24, 20, 67, 34, 35, 46, 22, 35, 43, 54, 33, 20, 31, 29, 43, 36, 30, 23, 23, 57, 38, 34, 34, 28, 34, 31, 22, 33, 26]
ex: [22, 25, 22, 31, 23, 30, 29, 28, 35, 29, 10, 51, 22, 31, 27, 36, 16, 27, 25, 26, 37, 30, 33, 18, 40, 37, 21, 43, 46, 38, 18, 35, 23, 35, 35, 38, 29, 31, 43, 38]
lv: [17, 16, 17, 35, 26, 23, 38, 36, 24, 20, 47, 8, 59, 57, 33, 34, 16, 30, 37, 27, 24, 33, 44, 23, 55, 46, 34]
nm: [54, 34, 51, 49, 31, 27, 89, 26, 23, 36, 35, 16, 33, 45, 41, 35, 28, 32, 22, 29, 35, 41, 30, 25, 19, 65, 23, 31, 39, 17, 54, 42, 56, 29, 34, 13]
dt: [46, 37, 29, 49, 33, 25, 26, 20, 29, 22, 32, 31, 19, 29, 23, 22, 20, 22, 21, 20, 23, 29, 26, 22, 19, 19, 26, 69, 28, 20, 30, 52, 29, 12]

mix.exs

defmodule Versicle.Mixfile do
  use Mix.Project

  def project do
    [app: :versicle,
     version: "0.0.1",
     elixir: "~> 1.2",
     build_embedded: Mix.env == :prod,
     start_permanent: Mix.env == :prod,
     deps: deps]
  end

  # Configuration for the OTP application
  #
  # Type "mix help compile.app" for more information
  def application do
    [applications: [:logger,  :yaml_elixir]]
  end

  # Dependencies can be Hex packages:
  #
  #   {:mydep, "~> 0.3.0"}
  #
  # Or git/path repositories:
  #
  #   {:mydep, git: "https://github.com/elixir-lang/mydep.git", tag: "0.1.0"}
  #
  # Type "mix help deps" for more examples and options
  defp deps do
    [{:csv, "~> 1.4"},
    {:yaml_elixir, "~> 1.2"},
    {:yamerl, github: "yakaz/yamerl"},]
  end
end

versicle.ex

defmodule Versicle do
 require YamlElixir
 use GenServer

 def start(src \\ "./bible.yaml" |> Path.expand(__DIR__)) do

   {:ok, pid} = GenServer.start_link(Versicle, [src])
   {:ok, csv_file} = GenServer.call(pid, :load)
   IO.puts(csv_file)
   {:ok, pid}
 end

 def suggest(pid) do
   GenServer.call(pid, :suggest)
 end

 def handle_call(:load, _from, [src]) do
   table = src |> YamlElixir.read_from_file
   keys = Map.keys(table)
   len = length(keys)
   {:reply, {:ok, src}, [src, len, keys, table]}
 end

 def handle_call(:suggest, _from, [src| [len, keys, table]]) do

  book_idx = :rand.uniform(len) - 1
  book = Enum.at(keys, book_idx)
  chapters = Map.get(table, book)
  chapter_idx = :rand.uniform(length(chapters)) - 1
  verse = :rand.uniform(chapters |> Enum.at(chapter_idx)) - 1
  {:reply, "#{book}#{chapter_idx}-#{verse}", [src, len, keys, table]}
 end

end
# Example:
# {:ok, pid} = Versicle.start()
# Versicle.suggest(pid)
# > ex1-18