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Author : Sergei Trofimovich <>
Stability : experimental
Portability : haskell98
Ungrouped utilitary stuff lays here until someone finds better place for it :]
module Util
( run_cmd -- :: String -> IO (Maybe String)
) where
import System.IO
import System.Process
import System.Exit (ExitCode(..))
-- 'run_cmd' executes command and returns it's standard output
-- as 'String'.
run_cmd :: String -> IO (Maybe String)
run_cmd cmd = do (hI, hO, hE, hProcess) <- runInteractiveCommand cmd
hClose hI
output <- hGetContents hO
errors <- hGetContents hE -- TODO: propagate error to caller
length output `seq` hClose hO
length errors `seq` hClose hE
exitCode <- waitForProcess hProcess
return $ if (output == "" || exitCode /= ExitSuccess)
then Nothing
else Just output
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