108 lines
3.7 KiB
Haskell
108 lines
3.7 KiB
Haskell
-- ghc-mod: Making Haskell development *more* fun
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-- Copyright (C) 2015 Daniel Gröber <dxld ÄT darkboxed DOT org>
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU Affero General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU Affero General Public License for more details.
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--
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-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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{-# LANGUAGE CPP #-}
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module Language.Haskell.GhcMod.Monad (
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runGhcModT
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, runGhcModT'
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, runGhcModT''
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, hoistGhcModT
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, runGmLoadedT
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, runGmLoadedT'
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, runGmLoadedTWith
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, runGmPkgGhc
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, withGhcModEnv
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, withGhcModEnv'
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, module Language.Haskell.GhcMod.Monad.Types
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) where
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Monad.Types
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import Language.Haskell.GhcMod.Error
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import Language.Haskell.GhcMod.Logging
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import Language.Haskell.GhcMod.Cradle
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import Language.Haskell.GhcMod.Target
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import Control.Arrow (first)
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import Control.Applicative
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import Control.Monad.Reader (runReaderT)
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import Control.Monad.State.Strict (runStateT)
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import Control.Monad.Trans.Journal (runJournalT)
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import Exception (ExceptionMonad(..))
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import System.Directory
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withCradle :: IOish m => FilePath -> (Cradle -> m a) -> m a
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withCradle cradledir f =
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gbracket (liftIO $ findCradle' cradledir) (liftIO . cleanupCradle) f
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withGhcModEnv :: IOish m => FilePath -> Options -> (GhcModEnv -> m a) -> m a
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withGhcModEnv dir opt f = withCradle dir (withGhcModEnv' opt f)
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withGhcModEnv' :: IOish m => Options -> (GhcModEnv -> m a) -> Cradle -> m a
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withGhcModEnv' opt f crdl = do
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olddir <- liftIO getCurrentDirectory
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gbracket_ (liftIO $ setCurrentDirectory $ cradleRootDir crdl)
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(liftIO $ setCurrentDirectory olddir)
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(f $ GhcModEnv opt crdl)
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where
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gbracket_ ma mb mc = gbracket ma (const mb) (const mc)
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-- | Run a @GhcModT m@ computation.
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runGhcModT :: IOish m
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=> Options
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-> GhcModT m a
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-> m (Either GhcModError a, GhcModLog)
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runGhcModT opt action = do
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dir <- liftIO getCurrentDirectory
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runGhcModT' dir opt action
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runGhcModT' :: IOish m
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=> FilePath
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-> Options
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-> GhcModT m a
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-> m (Either GhcModError a, GhcModLog)
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runGhcModT' dir opt action = liftIO (canonicalizePath dir) >>= \dir' ->
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withGhcModEnv dir' opt $ \env ->
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first (fst <$>) <$> runGhcModT'' env defaultGhcModState
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(gmSetLogLevel (logLevel opt) >> action)
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-- | @hoistGhcModT result@. Embed a GhcModT computation's result into a GhcModT
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-- computation. Note that if the computation that returned @result@ modified the
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-- state part of GhcModT this cannot be restored.
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hoistGhcModT :: IOish m
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=> (Either GhcModError a, GhcModLog)
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-> GhcModT m a
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hoistGhcModT (r,l) = do
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gmlJournal l >> case r of
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Left e -> throwError e
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Right a -> return a
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-- | Run a computation inside @GhcModT@ providing the RWST environment and
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-- initial state. This is a low level function, use it only if you know what to
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-- do with 'GhcModEnv' and 'GhcModState'.
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--
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-- You should probably look at 'runGhcModT' instead.
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runGhcModT'' :: IOish m
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=> GhcModEnv
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-> GhcModState
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-> GhcModT m a
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-> m (Either GhcModError (a, GhcModState), GhcModLog)
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runGhcModT'' r s a = do
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flip runReaderT r $ runJournalT $ runErrorT $ runStateT (unGhcModT a) s
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