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skogsra

1.3.0
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Manages OS environment variables and application configuration options with ease

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skogsra lib skogsra app.ex
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lib/skogsra/app.ex 

defmodule Skogsra.App do

  @moduledoc """

  This module defines the functions to get variables from the configuration.

  """

  alias Skogsra.Env



  ############

  # Public API



  @doc """

  Gets config variable value given a `Skogsra.Env` struct.

  """

  @spec get_env(Env.t()) :: nil | term()

  def get_env(env)



  def get_env(%Env{options: options} = env) do

    if options[:skip_config], do: nil, else: do_get_env(env)

  end



  #########

  # Helpers



  @doc false

  @spec do_get_env(Env.t()) :: nil | term()

  def do_get_env(env)



  def do_get_env(%Env{

        namespace: nil,

        app_name: app_name,

        keys: [key | keys]

      }) do

    module = Application.get_env(:skogsra, :application_module, Application)

    value = apply(module, :get_env, [app_name, key])

    lookup(value, keys)

  end



  def do_get_env(%Env{

        namespace: namespace,

        app_name: app_name,

        keys: keys

      }) do

    module = Application.get_env(:skogsra, :application_module, Application)

    value = apply(module, :get_env, [app_name, namespace])

    lookup(value, keys)

  end



  @doc false

  @spec lookup(term(), Env.keys()) :: nil | term()

  def lookup(value, keys)



  def lookup(value, []) do

    value

  end



  def lookup(value, [key | keys]) when is_list(value) do

    value

    |> Keyword.get(key)

    |> lookup(keys)

  end



  def lookup(_, _) do

    nil

  end

end