import Foreign.C
import Control.Monad
import GHC.IOBase
+#include "config.h"
#endif
#ifdef __HUGS__
-- ---------------------------------------------------------------------------
-- getArgs, getProgName, getEnv
--- Computation `getArgs' returns a list of the program's command
+-- | Computation 'getArgs' returns a list of the program's command
-- line arguments (not including the program name).
#ifdef __GLASGOW_HASKELL__
isPathSeparator _ = False
--- Computation `getEnv var' returns the value
--- of the environment variable {\em var}.
-
--- This computation may fail with
--- NoSuchThing: The environment variable does not exist.
+-- | Computation 'getEnv' @var@ returns the value
+-- of the environment variable @var@.
+--
+-- This computation may fail with:
+--
+-- * 'System.IO.Error.isDoesNotExistError' if the environment variable
+-- does not exist.
getEnv :: String -> IO String
getEnv name =
@withArgs args act@ - while executing action @act@, have 'System.getArgs'
return @args@ (GHC only).
-}
+withArgs :: [String] -> IO a -> IO a
withArgs xs act = do
p <- System.Environment.getProgName
withArgv (p:xs) act
@withProgName name act@ - while executing action @act@,
have 'System.getProgName' return @name@ (GHC only).
-}
+withProgName :: String -> IO a -> IO a
withProgName nm act = do
xs <- System.Environment.getArgs
withArgv (nm:xs) act
-- Worker routine which marshals and replaces an argv vector for
-- the duration of an action.
+withArgv :: [String] -> IO a -> IO a
withArgv new_args act = do
pName <- System.Environment.getProgName
existing_args <- System.Environment.getArgs