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file_only_logger lib file only logger app.ex
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lib/file/only/logger/app.ex

defmodule File.Only.Logger.App do
use Application
@spec start(Application.start_type(), term) :: {:ok, pid}
def start(_start_type, _start_args = :ok) do
# Prevent console messages...
:ok = :logger.set_handler_config(:default, :level, :none)
# Add debug, info, warning and error handlers...
Logger.add_handlers(:file_only_logger)
# Returns :ok or {:error, term} where term would likely be:
# {:bad_config, {:handler, {:file_only_logger, {:already_exist, _id}}}}
# Allow console messages...
:ok = :logger.set_handler_config(:default, :level, Logger.level())
{:ok, self()}
end
end