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-- cabal-helper: Simple interface to Cabal's configuration state
-- Copyright (C) 2017-2018 Daniel Gröber <cabal-helper@dxld.at>
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU 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 General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
{-# LANGUAGE ScopedTypeVariables #-}
{-|
Module : CabalHelper.Compiletime.Log
Description : Basic logging facilities
License : GPL-3
-}
module CabalHelper.Compiletime.Log where
import Control.Monad
import Control.Monad.IO.Class
import Control.Exception as E
import Data.String
import System.IO
import Prelude
import CabalHelper.Compiletime.Types
vLog :: MonadIO m => Options -> String -> m ()
vLog Options { oVerbose = True } msg =
liftIO $ hPutStrLn stderr msg
vLog _ _ = return ()
logIOError :: Options -> String -> IO (Maybe a) -> IO (Maybe a)
logIOError opts label a = do
a `E.catch` \(ex :: IOError) -> do
vLog opts $ label ++ ": " ++ show ex
return Nothing
|
