content: -- This file is part of the Wire Server implementation.
  --
  -- Copyright (C) 2022 Wire Swiss GmbH <opensource@wire.com>
  --
  -- This program is free software: you can redistribute it and/or modify it under
  -- the terms of the GNU Affero General Public License as published by the Free
  -- Software Foundation, either version 3 of the License, or (at your option) any
  -- later version.
  --
  -- This program is distributed in the hope that it will be useful, but WITHOUT
  -- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  -- FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
  -- details.
  --
  -- You should have received a copy of the GNU Affero General Public License along
  -- with this program. If not, see <https://www.gnu.org/licenses/>.
  
  module Util.Options.Common
    ( module Cassandra.Helpers,
      module Util.Options.Common,
    )
  where
  
  import Cassandra.Helpers (toOptionFieldName)
  import Imports hiding (reader)
  import System.Posix.Env qualified as Posix
  
  optOrEnv :: (a -> b) -> Maybe a -> (String -> b) -> String -> IO b
  optOrEnv getter conf reader var = case conf of
    Nothing -> reader <$> getEnv var
    Just c -> pure $ getter c
  
  optOrEnvSafe :: (a -> b) -> Maybe a -> (String -> b) -> String -> IO (Maybe b)
  optOrEnvSafe getter conf reader var = case conf of
    Nothing -> fmap reader <$> Posix.getEnv var
    Just c -> pure $ Just (getter c)
  