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|
-- cabal-helper: Simple interface to Cabal's configuration state
-- Copyright (C) 2018 Daniel Gröber <cabal-helper@dxld.at>
--
-- SPDX-License-Identifier: Apache-2.0
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
{-|
Module : CabalHelper.Compiletime.Log
Description : Logging utilities
License : Apache-2.0
-}
module CabalHelper.Compiletime.Log where
import Control.Monad.IO.Class
import System.IO
import System.IO.Error
import CabalHelper.Compiletime.Types
logIOError :: Verbose => String -> IO (Maybe a) -> IO (Maybe a)
logIOError label a = do
a `catchIOError` \ex -> do
vLog $ label ++ ": " ++ show ex
return Nothing
vLog :: (MonadIO m, Verbose) => String -> m ()
vLog msg
| ?verbose 0 = liftIO $ hPutStrLn stderr msg
| otherwise = return ()
|
