Split L.H.GM.Monad.Types module

Language/Haskell/GhcMod/Monad/Log.hs

@@ -0,0 +1,71 @@
+-- ghc-mod: Making Haskell development *more* fun
+-- Copyright (C) 2015,2016  Daniel Gröber <dxld ÄT darkboxed DOT org>
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU Affero General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU Affero General Public License for more details.
+--
+-- You should have received a copy of the GNU Affero General Public License
+-- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+{-# LANGUAGE GeneralizedNewtypeDeriving, StandaloneDeriving #-}
+{-# LANGUAGE FlexibleInstances, UndecidableInstances #-}
+
+module Language.Haskell.GhcMod.Monad.Log where
+
+import Language.Haskell.GhcMod.Types
+import Language.Haskell.GhcMod.Monad.Newtypes
+
+import Control.Monad
+import Control.Monad.Trans.Journal (JournalT)
+import Control.Monad.Reader (ReaderT(..))
+import Control.Monad.State.Strict (StateT(..))
+import Control.Monad.Error (Error, ErrorT(..))
+import Control.Monad.Trans.Maybe (MaybeT(..))
+import Control.Monad.Journal.Class (MonadJournal(..))
+import Control.Monad.Trans.Class (MonadTrans(..))
+import Prelude
+
+class Monad m => GmLog m where
+    gmlJournal :: GhcModLog -> m ()
+    gmlHistory :: m GhcModLog
+    gmlClear   :: m ()
+
+instance Monad m => GmLog (JournalT GhcModLog m) where
+    gmlJournal = journal
+    gmlHistory = history
+    gmlClear   = clear
+
+instance Monad m => GmLog (GmT m) where
+    gmlJournal = GmT . lift . lift . journal
+    gmlHistory = GmT $ lift $ lift history
+    gmlClear   = GmT $ lift $ lift clear
+
+instance (Monad m, GmLog m) => GmLog (ReaderT r m) where
+    gmlJournal = lift . gmlJournal
+    gmlHistory = lift gmlHistory
+    gmlClear = lift  gmlClear
+
+instance (Monad m, GmLog m) => GmLog (StateT s m) where
+    gmlJournal = lift . gmlJournal
+    gmlHistory = lift gmlHistory
+    gmlClear = lift gmlClear
+
+instance (Monad m, GmLog m, Error e) => GmLog (ErrorT e m) where
+    gmlJournal = lift . gmlJournal
+    gmlHistory = lift gmlHistory
+    gmlClear = lift gmlClear
+
+instance (Monad m, GmLog m) => GmLog (MaybeT  m) where
+    gmlJournal = lift . gmlJournal
+    gmlHistory = lift gmlHistory
+    gmlClear = lift gmlClear
+
+deriving instance GmLog m => GmLog (GmOutT m)
+deriving instance (Monad m, GmLog (GhcModT m)) => GmLog (GmlT m)