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Only supress stderr on success

This commit is contained in:
Daniel Gröber 2014-04-18 13:20:00 +02:00
parent 4389dea800
commit 8f3fb2a7d7
1 changed files with 10 additions and 3 deletions
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13
Language/Haskell/GhcMod/GhcPkg.hs
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@ -18,9 +18,10 @@ import Data.Char (isSpace,isAlphaNum)
import Data.List (isPrefixOf, intercalate)
import Data.Maybe (listToMaybe, maybeToList)
import Language.Haskell.GhcMod.Types
import Language.Haskell.GhcMod.Utils
import System.FilePath ((</>))
import System.Process (readProcess)
import System.Process (readProcessWithExitCode)
import System.IO (hPutStrLn,stderr)
import System.Exit (ExitCode(..))
import Text.ParserCombinators.ReadP (ReadP, char, between, sepBy1, many1, string, choice, eof)
import qualified Text.ParserCombinators.ReadP as P
@ -67,7 +68,13 @@ ghcPkgList dbs = map fst3 <$> ghcPkgListEx dbs
ghcPkgListEx :: [GhcPkgDb] -> IO [Package]
ghcPkgListEx dbs = do
output <- suppressStderr $ readProcess "ghc-pkg" opts ""
(rv,output,err) <- readProcessWithExitCode "ghc-pkg" opts ""
case rv of
ExitFailure val -> do
hPutStrLn stderr err
fail $ "ghc-pkg " ++ intercalate " " opts ++ " (exit " ++ show val ++ ")"
ExitSuccess -> return ()
return $ parseGhcPkgOutput $ lines output
where
opts = ["list", "-v"] ++ ghcPkgDbStackOpts dbs