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-- |Wrappers around some handy unix shell commands. Please let
-- me know if you think of better module names to hold these
-- functions. -dsf
module System.Unix.Misc
( md5sum
, gzip)
where
import Control.Exception
import Data.Maybe
import System.Cmd
import System.Directory
import System.Exit
import System.IO
import System.Posix.Files
import System.Process
import System.Unix.Process
md5sum :: FilePath -> IO String
md5sum path =
do
(text, _, exitCode) <- simpleProcess "md5sum" [path]
let output = listToMaybe (words text)
case exitCode of
ExitSuccess ->
case output of
Nothing -> error ("Error in output of 'md5sum " ++ path ++ "'")
Just checksum -> return checksum
ExitFailure _ -> error ("Error running 'md5sum " ++ path ++ "'")
gzip :: FilePath -> IO ()
gzip path =
do
result <- system ("gzip < " ++ path ++ " > " ++ path ++ ".gz")
case result of
ExitSuccess -> return ()
e -> error (show e)
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