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utility package for loading, validating and documenting your app's configuration variables from env, json, jsonc and toml files at runtime and injecting them into your environment
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lib/enux.ex
defmodule Enux do
@moduledoc """
A module for reading variables from .env style configuration files and injecting them into your application.
In elixir 1.11, `config/runtime.exs` was introduced. This is a file that is executed exactly before your application starts.
This is a proper place to load any configuration variables into your app. If this file does not exist in your project directory,
create it and add these lines to it:
```
import Config
env = Enux.load()
config :otp_app, env
```
When you start your application, you can access your configuration variables using `Applicatoin.get_env`.
If you need to url encode your configuration values, just pass `url_encoded: true` to `Enux.load`.
"""
@doc """
reads the variables in `config/.env` and returns a formatted keyword list.
all values are loaded as they are.
"""
def load() do
File.stream!("config/.env", [], :line) |> pipeline([])
end
@doc """
reads the variables in `config/.env` and returns a formatted keyword list
"""
def load(opts) when is_list(opts) do
File.stream!("config/.env", [], :line) |> pipeline(opts)
end
@doc """
reads the variables in the given path and returns a formatted keyword list
"""
def load(path, opts \\ []) when is_binary(path) and is_list(opts) do
File.stream!(path, [], :line) |> pipeline(opts)
end
defp pipeline(content, opts) do
content
|> Enum.filter(fn l -> String.trim(l) != "" end)
|> Enum.map(fn l -> Regex.run(~r/(?<k>[A-Za-z_\s]+)=(?<v>.*)/, l, capture: :all_but_first) end)
|> Enum.map(fn l -> l |> Enum.map(fn i -> String.trim(i) end) end)
|> Enum.map(fn [k, v] -> {k |> String.to_atom(), v |> url_encode_conditional(opts)} end)
end
defp url_encode_conditional(value, opts) when is_binary(value) and is_list(opts) do
case opts |> Keyword.get(:url_encoded, false) do
true -> value |> URI.encode()
false -> value
end
end
end