EnvConfig

Handles fetching values from config with support for runtime ENV loading.

All credit goes to bitwalker, this module is copied from this gist.

Usage

Fetches a value from the config, or from the environment if {:system, "VAR"} is provided.

An optional default value can be provided if desired.

In your config/config.exs:

# maybe you start your app with FOO_KEY=abcd
config :foo_app, :some_setting, {:system, "FOO_KEY"}

In your application:

EnvConfig.get(:foo_app, :some_setting) # => "abcd"

Example

iex> {test_var, expected_value} = System.get_env |> Enum.take(1) |> List.first
...> Application.put_env(:myapp, :test_var, {:system, test_var})
...> ^expected_value = EnvConfig.get(:myapp, :test_var)
...> :ok
:ok

iex> Application.put_env(:myapp, :test_var2, 1)
...> 1 = EnvConfig.get(:myapp, :test_var2)
1

iex> :default = EnvConfig.get(:myapp, :missing_var, :default)
:default

Installation

If available in Hex, the package can be installed as:

1. Add env_config to your list of dependencies in mix.exs:

def deps do
  [{:env_config, "~> 0.1.0"}]
end

2. Ensure env_config is started before your application:

def application do
  [applications: [:env_config]]
end