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{-# LANGUAGE Safe #-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE CApiFFI #-}
module System.Environment.Blank
(
module System.Environment,
getEnv,
getEnvDefault,
setEnv,
unsetEnv,
) where
import Foreign.C
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import System.Posix.Internals
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import GHC.IO.Exception
import System.IO.Error
import Control.Exception.Base
import Data.Maybe
import System.Environment
(
getArgs,
getProgName,
getExecutablePath,
withArgs,
withProgName,
getEnvironment
)
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import qualified System.Environment as Environment
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throwInvalidArgument :: String -> IO a
throwInvalidArgument :: String -> IO a
throwInvalidArgument from :: String
from =
IOError -> IO a
forall e a. Exception e => e -> IO a
throwIO (IOErrorType -> String -> Maybe Handle -> Maybe String -> IOError
mkIOError IOErrorType
InvalidArgument String
from Maybe Handle
forall a. Maybe a
Nothing Maybe String
forall a. Maybe a
Nothing)
getEnv :: String -> IO (Maybe String)
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getEnv :: String -> IO (Maybe String)
getEnv = String -> IO (Maybe String)
Environment.lookupEnv
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getEnvDefault ::
String ->
String ->
IO String
getEnvDefault :: String -> String -> IO String
getEnvDefault name :: String
name fallback :: String
fallback = String -> Maybe String -> String
forall a. a -> Maybe a -> a
fromMaybe String
fallback (Maybe String -> String) -> IO (Maybe String) -> IO String
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String -> IO (Maybe String)
getEnv String
name
setEnv ::
String ->
String ->
Bool ->
IO ()
setEnv :: String -> String -> Bool -> IO ()
setEnv key_ :: String
key_ value_ :: String
value_ overwrite :: Bool
overwrite
| String -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
key = String -> IO ()
forall a. String -> IO a
throwInvalidArgument "setEnv"
| '=' Char -> String -> Bool
forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` String
key = String -> IO ()
forall a. String -> IO a
throwInvalidArgument "setEnv"
| Bool
otherwise =
if Bool
overwrite
then String -> String -> IO ()
setEnv_ String
key String
value
else do
Maybe String
env_var <- String -> IO (Maybe String)
getEnv String
key
case Maybe String
env_var of
Just _ -> () -> IO ()
forall (m :: * -> *) a. Monad m => a -> m a
return ()
Nothing -> String -> String -> IO ()
setEnv_ String
key String
value
where
key :: String
key = (Char -> Bool) -> String -> String
forall a. (a -> Bool) -> [a] -> [a]
takeWhile (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
/= '\NUL') String
key_
value :: String
value = (Char -> Bool) -> String -> String
forall a. (a -> Bool) -> [a] -> [a]
takeWhile (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
/= '\NUL') String
value_
setEnv_ :: String -> String -> IO ()
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setEnv_ :: String -> String -> IO ()
setEnv_ key :: String
key value :: String
value =
String -> (CString -> IO ()) -> IO ()
forall a. String -> (CString -> IO a) -> IO a
withFilePath String
key ((CString -> IO ()) -> IO ()) -> (CString -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \ keyP :: CString
keyP ->
String -> (CString -> IO ()) -> IO ()
forall a. String -> (CString -> IO a) -> IO a
withFilePath String
value ((CString -> IO ()) -> IO ()) -> (CString -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ \ valueP :: CString
valueP ->
String -> IO CInt -> IO ()
forall a. (Eq a, Num a) => String -> IO a -> IO ()
throwErrnoIfMinus1_ "setenv" (IO CInt -> IO ()) -> IO CInt -> IO ()
forall a b. (a -> b) -> a -> b
$
CString -> CString -> CInt -> IO CInt
c_setenv CString
keyP CString
valueP (Int -> CInt
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Bool -> Int
forall a. Enum a => a -> Int
fromEnum Bool
True))
foreign import ccall unsafe "setenv"
c_setenv :: CString -> CString -> CInt -> IO CInt
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unsetEnv :: String -> IO ()
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unsetEnv :: String -> IO ()
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unsetEnv name = withFilePath name $ \ s ->
throwErrnoIfMinus1_ "unsetenv" (c_unsetenv s)
foreign import capi unsafe "HsBase.h unsetenv"
c_unsetenv :: CString -> IO CInt
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