45 lines
1.6 KiB
Haskell
45 lines
1.6 KiB
Haskell
module Language.Haskell.GhcMod.Utils where
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import Language.Haskell.GhcMod.Error
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import MonadUtils (MonadIO, liftIO)
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import System.Directory (getCurrentDirectory, setCurrentDirectory)
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import System.Exit (ExitCode(..))
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import System.Process (readProcessWithExitCode)
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-- dropWhileEnd is not provided prior to base 4.5.0.0.
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dropWhileEnd :: (a -> Bool) -> [a] -> [a]
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dropWhileEnd p = foldr (\x xs -> if p x && null xs then [] else x : xs) []
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extractParens :: String -> String
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extractParens str = extractParens' str 0
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where
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extractParens' :: String -> Int -> String
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extractParens' [] _ = []
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extractParens' (s:ss) level
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| s `elem` "([{" = s : extractParens' ss (level+1)
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| level == 0 = extractParens' ss 0
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| s `elem` "}])" && level == 1 = [s]
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| s `elem` "}])" = s : extractParens' ss (level-1)
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| otherwise = s : extractParens' ss level
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readProcess' :: (MonadIO m, MonadError GhcModError m)
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=> String
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-> [String]
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-> m String
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readProcess' cmd opts = do
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(rv,output,err) <- liftIO (readProcessWithExitCode cmd opts "")
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`modifyError'` GMEProcess ([cmd] ++ opts)
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case rv of
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ExitFailure val -> do
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throwError $ GMEProcess ([cmd] ++ opts) $ strMsg $
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cmd ++ " " ++ unwords opts ++ " (exit " ++ show val ++ ")"
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++ "\n" ++ err
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ExitSuccess ->
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return output
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withDirectory_ :: (MonadIO m, ExceptionMonad m) => FilePath -> m a -> m a
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withDirectory_ dir action =
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gbracket (liftIO getCurrentDirectory) (liftIO . setCurrentDirectory)
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(\_ -> liftIO (setCurrentDirectory dir) >> action)
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