102 lines
2.7 KiB
Haskell
102 lines
2.7 KiB
Haskell
{-# OPTIONS_GHC -Wno-orphans #-}
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{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE TypeOperators #-}
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module GHCup.Prelude where
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import Control.Applicative
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import Control.Monad
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import Control.Monad.Trans.Class ( lift )
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import Control.Exception.Safe
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import qualified Data.Strict.Maybe as S
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import Data.Monoid ( (<>) )
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import Data.String
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import qualified Data.Text.Lazy.Encoding as TLE
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import qualified Data.Text.Lazy as TL
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import Data.Text ( Text )
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import qualified Data.ByteString.Lazy as L
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import Haskus.Utils.Variant.Excepts
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import System.IO.Error
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fS :: IsString a => String -> a
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fS = fromString
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fromStrictMaybe :: S.Maybe a -> Maybe a
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fromStrictMaybe = S.maybe Nothing Just
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fSM :: S.Maybe a -> Maybe a
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fSM = fromStrictMaybe
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toStrictMaybe :: Maybe a -> S.Maybe a
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toStrictMaybe = maybe S.Nothing S.Just
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tSM :: Maybe a -> S.Maybe a
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tSM = toStrictMaybe
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internalError :: String -> IO a
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internalError = fail . ("Internal error: " <>)
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iE :: String -> IO a
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iE = internalError
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-- | Like 'when', but where the test can be monadic.
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whenM :: Monad m => m Bool -> m () -> m ()
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whenM ~b ~t = ifM b t (return ())
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-- | Like 'unless', but where the test can be monadic.
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unlessM :: Monad m => m Bool -> m () -> m ()
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unlessM ~b ~f = ifM b (return ()) f
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-- | Like @if@, but where the test can be monadic.
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ifM :: Monad m => m Bool -> m a -> m a -> m a
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ifM ~b ~t ~f = do
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b' <- b
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if b' then t else f
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whileM :: Monad m => m a -> (a -> m Bool) -> m a
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whileM ~action ~f = do
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a <- action
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b' <- f a
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if b' then whileM action f else pure a
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whileM_ :: Monad m => m a -> (a -> m Bool) -> m ()
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whileM_ ~action = void . whileM action
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guardM :: (Monad m, Alternative m) => m Bool -> m ()
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guardM ~f = guard =<< f
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lBS2sT :: L.ByteString -> Text
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lBS2sT = TL.toStrict . TLE.decodeUtf8
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handleIO' :: IOErrorType -> (IOException -> IO ()) -> IO () -> IO ()
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handleIO' err handler =
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handleIO (\e -> if err == ioeGetErrorType e then handler e else ioError e)
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(??) :: forall e es a m . (Monad m, e :< es) => Maybe a -> e -> Excepts es m a
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(??) m e = maybe (throwE e) pure m
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(!?) :: forall e es a m
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. (Monad m, e :< es)
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=> m (Maybe a)
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-> e
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-> Excepts es m a
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(!?) em e = lift em >>= (?? e)
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lE :: forall e es a m . (Monad m, e :< es) => Either e a -> Excepts es m a
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lE = liftE . veitherToExcepts . fromEither
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lEM :: forall e es a m . (Monad m, e :< es) => m (Either e a) -> Excepts es m a
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lEM em = lift em >>= lE
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fromEither :: Either a b -> VEither '[a] b
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fromEither = either (VLeft . V) VRight
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