-- Hoogle documentation, generated by Haddock
-- See Hoogle, http://www.haskell.org/hoogle/
-- | boxes
--
-- A profunctor effect
@package box
@version 0.8.1
-- | Extra Codensity operators.
module Box.Codensity
-- | close a continuation
--
--
-- >>> close $ glue showStdout <$> qList [1..3]
-- 1
-- 2
-- 3
--
close :: Codensity m (m r) -> m r
-- | fmap then close over a Codensity
--
--
-- >>> process (glue showStdout) (qList [1..3])
-- 1
-- 2
-- 3
--
process :: forall a m r. (a -> m r) -> Codensity m a -> m r
-- | fmap then close over a Codensity
--
--
-- >>> glue showStdout <$|> qList [1..3]
-- 1
-- 2
-- 3
--
(<$|>) :: forall a m r. (a -> m r) -> Codensity m a -> m r
infixr 3 <$|>
-- | apply to a continuation and close.
--
--
-- >>> glue <$> (pure showStdout) <*|> qList [1..3]
-- 1
-- 2
-- 3
--
(<*|>) :: Codensity m (a -> m r) -> Codensity m a -> m r
infixr 3 <*|>
instance GHC.Base.Semigroup a => GHC.Base.Semigroup (Control.Monad.Codensity.Codensity m a)
instance (GHC.Base.Functor m, GHC.Base.Semigroup a, GHC.Base.Monoid a) => GHC.Base.Monoid (Control.Monad.Codensity.Codensity m a)
module Box.Functor
-- | An endofunctor in the category of endofunctors.
--
-- Like MFunctor but without a Monad constraint.
class FFunctor (h :: (Type -> Type) -> Type -> Type)
foist :: FFunctor h => (forall x. f x -> g x) -> h f a -> h g a
-- | Monadically Foldable
class FoldableM (t :: (Type -> Type) -> Type -> Type)
foldrM :: (FoldableM t, Monad m) => (a -> m b -> m b) -> m b -> t m a -> m b
-- | emit
module Box.Emitter
-- | an Emitter emits values of type Maybe a. Source &
-- Producer are also appropriate metaphors.
--
-- An Emitter reaches into itself for the value to emit, where itself is
-- an opaque thing from the pov of usage.
--
--
-- >>> e = Emitter (pure (Just "I'm emitted"))
--
-- >>> emit e
-- Just "I'm emitted"
--
--
--
-- >>> emit mempty
-- Nothing
--
newtype Emitter m a
Emitter :: m (Maybe a) -> Emitter m a
[emit] :: Emitter m a -> m (Maybe a)
-- | An Emitter continuation.
type CoEmitter m a = Codensity m (Emitter m a)
-- | Collect emits into a list, and close on the first Nothing.
--
--
-- >>> toListM <$|> qList [1..3]
-- [1,2,3]
--
toListM :: Monad m => Emitter m a -> m [a]
-- | A monadic Witherable
--
--
-- >>> close $ toListM <$> witherE (\x -> bool (print x >> pure Nothing) (pure (Just x)) (even x)) <$> (qList [1..3])
-- 1
-- 3
-- [2]
--
witherE :: Monad m => (a -> m (Maybe b)) -> Emitter m a -> Emitter m b
-- | Read parse Emitter, returning the original text on error
--
--
-- >>> process (toListM . readE) (qList ["1","2","3","four"]) :: IO [Either Text Int]
-- [Right 1,Right 2,Right 3,Left "four"]
--
readE :: (Functor m, Read a) => Emitter m Text -> Emitter m (Either Text a)
-- | Convert a list emitter to a (Stateful) element emitter.
--
--
-- >>> import Control.Monad.State.Lazy
--
-- >>> close $ flip runStateT [] . toListM . unlistE <$> (qList [[0..3],[5..7]])
-- ([0,1,2,3,5,6,7],[])
--
unlistE :: Monad m => Emitter m [a] -> Emitter (StateT [a] m) a
-- | Take n emits.
--
--
-- >>> import Control.Monad.State.Lazy
--
-- >>> close $ flip evalStateT 0 <$> toListM . takeE 4 <$> qList [0..]
-- [0,1,2,3]
--
takeE :: Monad m => Int -> Emitter m a -> Emitter (StateT Int m) a
-- | Take from an emitter until a predicate.
--
--
-- >>> process (toListM . takeUntilE (==3)) (qList [0..])
-- [0,1,2]
--
takeUntilE :: Monad m => (a -> Bool) -> Emitter m a -> Emitter m a
-- | Pop from a State sequence.
--
--
-- >>> import qualified Data.Sequence as Seq
--
-- >>> import Control.Monad.State.Lazy (evalStateT)
--
-- >>> flip evalStateT (Seq.fromList [1..3]) $ toListM pop
-- [1,2,3]
--
pop :: Monad m => Emitter (StateT (Seq a) m) a
instance Box.Functor.FFunctor Box.Emitter.Emitter
instance GHC.Base.Functor m => GHC.Base.Functor (Box.Emitter.Emitter m)
instance GHC.Base.Applicative m => GHC.Base.Applicative (Box.Emitter.Emitter m)
instance GHC.Base.Monad m => GHC.Base.Monad (Box.Emitter.Emitter m)
instance (GHC.Base.Monad m, GHC.Base.Alternative m) => GHC.Base.Alternative (Box.Emitter.Emitter m)
instance (GHC.Base.Alternative m, GHC.Base.Monad m) => GHC.Base.MonadPlus (Box.Emitter.Emitter m)
instance (GHC.Base.Alternative m, GHC.Base.Monad m) => GHC.Base.Semigroup (Box.Emitter.Emitter m a)
instance (GHC.Base.Alternative m, GHC.Base.Monad m) => GHC.Base.Monoid (Box.Emitter.Emitter m a)
instance Box.Functor.FoldableM Box.Emitter.Emitter
-- | commit
module Box.Committer
-- | A Committer commits values of type a and signals success or
-- otherwise. A Sink and a Consumer are some other metaphors for this.
--
-- A Committer absorbs the value being committed; the value disappears
-- into the opaque thing that is a Committer from the pov of usage.
--
--
-- >>> commit toStdout "I'm committed!"
-- I'm committed!
-- True
--
newtype Committer m a
Committer :: (a -> m Bool) -> Committer m a
[commit] :: Committer m a -> a -> m Bool
-- | Committer continuation.
type CoCommitter m a = Codensity m (Committer m a)
-- | A monadic Witherable
--
--
-- >>> glue (witherC (\x -> pure $ bool Nothing (Just x) (even x)) showStdout) <$|> qList [0..5]
-- 0
-- 2
-- 4
--
witherC :: Monad m => (b -> m (Maybe a)) -> Committer m a -> Committer m b
-- | Convert a committer to be a list committer. Think mconcat.
--
--
-- >>> glue showStdout <$|> qList [[1..3]]
-- [1,2,3]
--
--
--
-- >>> glue (listC showStdout) <$|> qList [[1..3]]
-- 1
-- 2
-- 3
--
listC :: Monad m => Committer m a -> Committer m [a]
-- | Push to a state sequence.
--
--
-- >>> import Control.Monad.State.Lazy
--
-- >>> import qualified Data.Sequence as Seq
--
-- >>> flip execStateT Seq.empty . glue push . foist lift <$|> qList [1..3]
-- fromList [1,2,3]
--
push :: Monad m => Committer (StateT (Seq a) m) a
instance Box.Functor.FFunctor Box.Committer.Committer
instance GHC.Base.Applicative m => GHC.Base.Semigroup (Box.Committer.Committer m a)
instance GHC.Base.Applicative m => GHC.Base.Monoid (Box.Committer.Committer m a)
instance Data.Functor.Contravariant.Contravariant (Box.Committer.Committer m)
instance GHC.Base.Applicative m => Data.Functor.Contravariant.Divisible.Divisible (Box.Committer.Committer m)
instance GHC.Base.Applicative m => Data.Functor.Contravariant.Divisible.Decidable (Box.Committer.Committer m)
-- | A box is something that commits and emits
module Box.Box
-- | A Box is a product of a Committer and an Emitter.
--
-- Think of a box with an incoming arrow an outgoing arrow. And then make
-- your pov ambiguous: are you looking at two wires from "inside a box";
-- or are you looking from "outside the box"; interacting with a black
-- box object. Either way, it looks the same: it's a box.
--
-- And either way, one of the arrows, the Committer, is
-- contravariant and the other, the Emitter is covariant. The
-- combination is a profunctor.
data Box m c e
Box :: Committer m c -> Emitter m e -> Box m c e
[committer] :: Box m c e -> Committer m c
[emitter] :: Box m c e -> Emitter m e
-- | A box continuation
type CoBox m a b = Codensity m (Box m a b)
-- | Wrapper for the semigroupoid instance of a box continuation.
newtype CoBoxM m a b
CoBoxM :: Codensity m (Box m a b) -> CoBoxM m a b
[uncobox] :: CoBoxM m a b -> Codensity m (Box m a b)
-- | A profunctor dimapMaybe
bmap :: Monad m => (a' -> m (Maybe a)) -> (b -> m (Maybe b')) -> Box m a b -> Box m a' b'
-- | Wrong kind signature for the FFunctor class
foistb :: (forall a. m a -> n a) -> Box m c e -> Box n c e
-- | Connect an emitter directly to a committer of the same type.
--
--
-- >>> glue showStdout <$|> qList [1..3]
-- 1
-- 2
-- 3
--
glue :: Monad m => Committer m a -> Emitter m a -> m ()
-- | Glues a committer and emitter, and takes n emits
--
--
-- >>> glueN 3 <$> pure showStdout <*|> qList [1..]
-- 1
-- 2
-- 3
--
--
-- Note that glueN counts the number of events passing across the
-- connection and doesn't take into account post-transmission activity in
-- the Committer, eg
--
--
-- >>> glueN 4 (witherC (\x -> bool (pure Nothing) (pure (Just x)) (even x)) showStdout) <$|> qList [0..9]
-- 0
-- 2
--
glueN :: Monad m => Int -> Committer m a -> Emitter m a -> m ()
-- | Glue a Committer to an Emitter within a box.
--
--
-- fuse (pure . pure) == \(Box c e) -> glue c e
--
--
-- A command-line echoer
--
--
-- fuse (pure . Just . ("echo " <>)) (Box toStdout fromStdin)
--
fuse :: Monad m => (a -> m (Maybe b)) -> Box m b a -> m ()
-- | combines divide conquer and liftA2 pure
class Divap p
divap :: Divap p => (a -> (b, c)) -> ((d, e) -> f) -> p b d -> p c e -> p a f
conpur :: Divap p => a -> p b a
-- | combines Decidable and Alternative
class Profunctor p => DecAlt p
choice :: DecAlt p => (a -> Either b c) -> (Either d e -> f) -> p b d -> p c e -> p a f
loss :: DecAlt p => p Void b
-- | Construct a CoBox
--
--
-- cobox = Box <$> c <*> e
--
--
--
-- >>> fuse (pure . Just . ("show: " <>) . pack . show) <$|> (cobox (pure toStdout) (qList [1..3]))
-- show: 1
-- show: 2
-- show: 3
--
cobox :: CoCommitter m a -> CoEmitter m b -> CoBox m a b
-- | State monad queue.
seqBox :: Monad m => Box (StateT (Seq a) m) a a
instance GHC.Base.Monad m => Data.Semigroupoid.Semigroupoid (Box.Box.CoBoxM m)
instance (GHC.Base.Monad m, GHC.Base.Alternative m) => Box.Box.DecAlt (Box.Box.Box m)
instance GHC.Base.Applicative m => Box.Box.Divap (Box.Box.Box m)
instance GHC.Base.Functor m => Data.Profunctor.Unsafe.Profunctor (Box.Box.Box m)
instance (GHC.Base.Alternative m, GHC.Base.Monad m) => GHC.Base.Semigroup (Box.Box.Box m c e)
instance (GHC.Base.Alternative m, GHC.Base.Monad m) => GHC.Base.Monoid (Box.Box.Box m c e)
-- | STM Queues, based originally on pipes-concurrency
module Box.Queue
-- | Queue specifies how messages are queued
data Queue a
Unbounded :: Queue a
Bounded :: Int -> Queue a
Single :: Queue a
Latest :: a -> Queue a
Newest :: Int -> Queue a
New :: Queue a
-- | Create an unbounded queue, returning the result from the Committer
-- action.
--
--
-- >>> queueL New (\c -> glue c <$|> qList [1..3]) toListM
--
queueL :: MonadConc m => Queue a -> (Committer m a -> m l) -> (Emitter m a -> m r) -> m l
-- | Create an unbounded queue, returning the result from the Emitter
-- action.
--
--
-- >>> queueR New (\c -> glue c <$|> qList [1..3]) toListM
-- [3]
--
queueR :: MonadConc m => Queue a -> (Committer m a -> m l) -> (Emitter m a -> m r) -> m r
-- | Create an unbounded queue, returning both results.
--
--
-- >>> queue Unbounded (\c -> glue c <$|> qList [1..3]) toListM
-- ((),[1,2,3])
--
queue :: MonadConc m => Queue a -> (Committer m a -> m l) -> (Emitter m a -> m r) -> m (l, r)
-- | Turn a box action into a box continuation
fromAction :: MonadConc m => (Box m a b -> m r) -> CoBox m b a
-- | Hook a committer action to a queue, creating an emitter continuation.
emitQ :: MonadConc m => Queue a -> (Committer m a -> m r) -> CoEmitter m a
-- | Hook a committer action to a queue, creating an emitter continuation.
commitQ :: MonadConc m => Queue a -> (Emitter m a -> m r) -> CoCommitter m a
-- | Various ways to connect things up.
module Box.Connectors
-- | Queue a list.
--
--
-- >>> pushList <$|> qList [1,2,3]
-- [1,2,3]
--
qList :: MonadConc m => [a] -> CoEmitter m a
-- | Directly supply a list to a committer action, via pop.
--
--
-- >>> popList [1..3] showStdout
-- 1
-- 2
-- 3
--
popList :: Monad m => [a] -> Committer m a -> m ()
-- | Push an Emitter into a list, via push.
--
--
-- >>> pushList <$|> qList [1..3]
-- [1,2,3]
--
pushList :: Monad m => Emitter m a -> m [a]
-- | Push an Emitter into a list, finitely.
--
--
-- >>> pushListN 2 <$|> qList [1..3]
-- [1,2]
--
pushListN :: Monad m => Int -> Emitter m a -> m [a]
-- | Create a finite Committer.
--
--
-- >>> glue <$> sink 2 print <*|> qList [1..3]
-- 1
-- 2
--
sink :: MonadConc m => Int -> (a -> m ()) -> CoCommitter m a
-- | Create a finite Emitter.
--
--
-- >>> glue toStdout <$|> source 2 (pure "hi")
-- hi
-- hi
--
source :: MonadConc m => Int -> m a -> CoEmitter m a
-- | Glues an emitter to a committer, then resupplies the emitter.
--
--
-- >>> (c1,l1) <- refCommitter :: IO (Committer IO Int, IO [Int])
--
-- >>> close $ toListM <$> (forkEmit <$> (qList [1..3]) <*> pure c1)
-- [1,2,3]
--
--
--
-- >>> l1
-- [1,2,3]
--
forkEmit :: Monad m => Emitter m a -> Committer m a -> Emitter m a
-- | Buffer a committer.
bufferCommitter :: MonadConc m => Committer m a -> CoCommitter m a
-- | Buffer an emitter.
bufferEmitter :: MonadConc m => Emitter m a -> CoEmitter m a
-- | Concurrently run two emitters.
--
-- This differs to (<>), which is left-biased.
--
-- Note that functions such as toListM, which complete on the first
-- Nothing emitted, will not work as expected.
--
--
-- >>> close $ (fmap toListM) (join $ concurrentE Single <$> qList [1..3] <*> qList [5..9])
-- [1,2,3]
--
--
-- In the code below, the ordering is non-deterministic.
--
--
-- (c,l) <- refCommitter :: IO (Committer IO Int, IO [Int])
-- close $ glue c <$> (join $ concurrentE Single <$> qList [1..30] <*> qList [40..60])
--
concurrentE :: MonadConc f => Queue a -> Emitter f a -> Emitter f a -> CoEmitter f a
-- | Concurrently run two committers.
--
--
-- >>> import Data.Functor.Contravariant
--
-- >>> import Data.Text (pack)
--
-- >>> cFast = witherC (\b -> pure (Just b)) . contramap ("fast: " <>) $ toStdout
--
-- >>> cSlow = witherC (\b -> sleep 0.1 >> pure (Just b)) . contramap ("slow: " <>) $ toStdout
--
-- >>> close $ (popList ((pack . show) <$> [1..3]) <$> (concurrentC Unbounded cFast cSlow)) <> pure (sleep 1)
-- fast: 1
-- fast: 2
-- fast: 3
-- slow: 1
-- slow: 2
-- slow: 3
--
concurrentC :: MonadConc m => Queue a -> Committer m a -> Committer m a -> CoCommitter m a
-- | IO effects
module Box.IO
-- | Emit text from stdin
--
--
-- λ> emit fromStdin
-- hello
-- Just "hello"
--
fromStdin :: Emitter IO Text
-- | Commit to stdout
--
--
-- >>> commit toStdout ("I'm committed!" :: Text)
-- I'm committed!
-- True
--
toStdout :: Committer IO Text
-- | Finite console emitter
--
--
-- λ> toListM <$|> fromStdinN 2
-- hello
-- hello again
-- ["hello","hello again"]
--
fromStdinN :: Int -> CoEmitter IO Text
-- | Finite console committer
--
--
-- >>> glue <$> contramap (pack . show) <$> (toStdoutN 2) <*|> qList [1..3]
-- 1
-- 2
--
toStdoutN :: Int -> CoCommitter IO Text
-- | Read from console, throwing away read errors
--
-- λ> glueN 2 showStdout (readStdin :: Emitter IO Int) 1 1 hippo 2
readStdin :: Read a => Emitter IO a
-- | Show to stdout
--
--
-- >>> glue showStdout <$|> qList [1..3]
-- 1
-- 2
-- 3
--
showStdout :: Show a => Committer IO a
-- | Emits lines of Text from a handle.
handleE :: Handle -> Emitter IO Text
-- | Commit lines of Text to a handle.
handleC :: Handle -> Committer IO Text
-- | Commit to an IORef
--
--
-- >>> (c1,l1) <- refCommitter :: IO (Committer IO Int, IO [Int])
--
-- >>> glue c1 <$|> qList [1..3]
--
-- >>> l1
-- [1,2,3]
--
refCommitter :: MonadConc m => m (Committer m a, m [a])
-- | Emit from a list IORef
--
--
-- >>> e <- refEmitter [1..3]
--
-- >>> toListM e
-- [1,2,3]
--
refEmitter :: MonadConc m => [a] -> m (Emitter m a)
-- | Emit lines of Text from a file.
fileE :: FilePath -> CoEmitter IO Text
-- | Commit lines of Text to a file.
fileWriteC :: FilePath -> CoCommitter IO Text
-- | Commit lines of Text, appending to a file.
fileAppendC :: FilePath -> CoCommitter IO Text
-- | Timing effects.
module Box.Time
-- | Sleep for x seconds.
sleep :: MonadConc m => Double -> m ()
-- | A value with a UTCTime annotation.
data Stamped a
Stamped :: !UTCTime -> !a -> Stamped a
[stamp] :: Stamped a -> !UTCTime
[value] :: Stamped a -> !a
-- | Add the current time
stampNow :: (MonadConc m, MonadIO m) => a -> m (LocalTime, a)
-- | Add the current time stamp.
--
--
-- > process (toListM . stampE) (qList [1..3])
-- [(2022-02-09 01:18:00.293883,1),(2022-02-09 01:18:00.293899,2),(2022-02-09 01:18:00.293903,3)]
--
stampE :: (MonadConc m, MonadIO m) => Emitter m a -> Emitter m (LocalTime, a)
-- | Wait s seconds before emitting
emitIn :: Emitter IO (Double, a) -> Emitter IO a
-- | Replay a stamped emitter, adjusting the speed of the replay.
--
--
-- > glueN 4 showStdout $| replay 1 (Emitter $ sleep 0.1 >> Just $ stampNow ())
--
replay :: Double -> Emitter IO (LocalTime, a) -> CoEmitter IO a
instance GHC.Read.Read a => GHC.Read.Read (Box.Time.Stamped a)
instance GHC.Show.Show a => GHC.Show.Show (Box.Time.Stamped a)
instance GHC.Classes.Eq a => GHC.Classes.Eq (Box.Time.Stamped a)
-- | A profunctor effect
--
-- “Boxes are surprisingly bulky. Discard or recycle the box your cell
-- phone comes in as soon as you unpack it. You don’t need the manual or
-- the CD that comes with it either. You’ll figure out the applications
-- you need through using it.” — Marie Kondo
module Box