Access project version within elixir application

Question

I have an elixir project with a defined version. How can I access this from within the running application.

in mix.exs

  def project do
    [app: :my_app         


        

Answer 1

I found the version inside of :application.which_applications, but it requires some parsing:

defmodule AppHelper do
  @spec app_version(atom) :: {integer, integer, integer}
  def app_version(target_app) do
    :application.which_applications
    |> Enum.filter(fn({app, _, _}) ->
                    app == target_app
                   end)
    |> get_app_vsn
  end

  # I use a sensible fallback when we can't find the app,
  # you could omit the first signature and just crash when the app DNE.
  defp get_app_vsn([]), do: {0,0,0} 
  defp get_app_vsn([{_app, _desc, vsn}]) do
    [maj, min, rev] = vsn
                      |> List.to_string
                      |> String.split(".")
                      |> Enum.map(&String.to_integer/1)
    {maj, min, rev}
  end
end

And then for usage:

iex(1)> AppHelper.app_version(:logger)
{1, 0, 5}

As always, there's probably a better way.