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plug_accesslog lib plug accesslog default_formatter environment.ex
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lib/plug/accesslog/default_formatter/environment.ex

defmodule Plug.AccessLog.DefaultFormatter.Environment do
@moduledoc """
Fetches an environment variable for logging.
"""
@doc """
Formats the log output.
"""
@spec format(Plug.Conn.t(), String.t()) :: iodata
def format(_conn, var), do: System.get_env(var) || ""
end