{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UndecidableInstances #-}

-- | A carrier for the 'Trace' effect that prints all traced results to stderr.
--
-- @since 1.0.0.0
module Control.Carrier.Trace.Printing
( -- * Trace carrier
  runTrace
, TraceC(..)
  -- * Trace effect
, module Control.Effect.Trace
) where

import Control.Algebra
import Control.Applicative (Alternative)
import Control.Effect.Trace
import Control.Monad (MonadPlus)
import Control.Monad.Fail as Fail
import Control.Monad.Fix
import Control.Monad.IO.Class
import Control.Monad.Trans.Class
import System.IO

-- | Run a 'Trace' effect, printing traces to 'stderr'.
--
-- @
-- 'runTrace' ('trace' s) = 'liftIO' ('putStrLn' s)
-- @
-- @
-- 'runTrace' ('pure' a) = 'pure' a
-- @
--
-- @since 1.0.0.0
runTrace :: TraceC m a -> m a
runTrace :: TraceC m a -> m a
runTrace (TraceC m a
m) = m a
m
{-# INLINE runTrace #-}

-- | @since 1.0.0.0
newtype TraceC m a = TraceC (m a)
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instance MonadTrans TraceC where
  lift :: m a -> TraceC m a
lift = m a -> TraceC m a
forall (m :: * -> *) a. m a -> TraceC m a
TraceC
  {-# INLINE lift #-}

instance (MonadIO m, Algebra sig m) => Algebra (Trace :+: sig) (TraceC m) where
  alg :: Handler ctx n (TraceC m)
-> (:+:) Trace sig n a -> ctx () -> TraceC m (ctx a)
alg Handler ctx n (TraceC m)
hdl (:+:) Trace sig n a
sig ctx ()
ctx = case (:+:) Trace sig n a
sig of
    L (Trace String
s) -> ctx ()
ctx ctx () -> TraceC m () -> TraceC m (ctx ())
forall (f :: * -> *) a b. Functor f => a -> f b -> f a
<$ IO () -> TraceC m ()
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (Handle -> String -> IO ()
hPutStrLn Handle
stderr String
s)
    R sig n a
other     -> m (ctx a) -> TraceC m (ctx a)
forall (m :: * -> *) a. m a -> TraceC m a
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       (n :: * -> *) a.
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alg (TraceC m (ctx x) -> m (ctx x)
forall (m :: * -> *) a. TraceC m a -> m a
runTrace (TraceC m (ctx x) -> m (ctx x))
-> (ctx (n x) -> TraceC m (ctx x)) -> ctx (n x) -> m (ctx x)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ctx (n x) -> TraceC m (ctx x)
Handler ctx n (TraceC m)
hdl) sig n a
other ctx ()
ctx)
  {-# INLINE alg #-}