Configuration helper with environment variable support.
This module provides get/3 and get_integer/3 functions that fetch values from
application config, with special handling for {:system, "VAR"} tuples to read
from environment variables.
Example
# In config.exs
config :ex_gram, token: {:system, "BOT_TOKEN"}
# At runtime
ExGram.Config.get(:ex_gram, :token) # Reads from $BOT_TOKEN env varSummary
Functions
Fetches a value from the config, or from the environment if {:system, "VAR"}
is provided.
An optional default value can be provided if desired.
Examples
iex> {test_var, expected_value} = System.get_env |> Enum.take(1) |> List.first
...> Application.put_env(:myapp, :test_var, {:system, test_var})
...> ^expected_value = Elixir.ExGram.Config.get(:myapp, :test_var)
...> :ok
:ok
iex> Application.put_env(:myapp, :test_var2, 1)
...> 1 = Elixir.ExGram.Config.get(:myapp, :test_var2)
1
iex> :default = Elixir.ExGram.Config.get(:myapp, :missing_var, :default)
:defaultSame as get/3, but returns the result as an integer.
If the value cannot be converted to an integer, the default is returned instead.