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|
{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{- |
Module : Text.Pandoc.Class.PandocIO
Copyright : Copyright (C) 2016-2020 Jesse Rosenthal, John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : Jesse Rosenthal <jrosenthal@jhu.edu>
Stability : alpha
Portability : portable
This module defines @'PandocIO'@, an IO-based instance of the
@'PandocMonad'@ type class. File, data, and network access all are run
using IO operators.
-}
module Text.Pandoc.Class.PandocIO
( PandocIO(..)
, runIO
, runIOorExplode
, extractMedia
) where
import Control.Monad.Except (ExceptT, MonadError, runExceptT)
import Control.Monad.IO.Class (MonadIO)
import Control.Monad.State (StateT, evalStateT, lift, get, put)
import Data.Default (Default (def))
import Text.Pandoc.Class.CommonState (CommonState (..))
import Text.Pandoc.Class.PandocMonad
import Text.Pandoc.Definition
import Text.Pandoc.Error
import qualified Text.Pandoc.Class.IO as IO
-- | Evaluate a 'PandocIO' operation.
runIO :: PandocIO a -> IO (Either PandocError a)
runIO ma = flip evalStateT def $ runExceptT $ unPandocIO ma
-- | Evaluate a 'PandocIO' operation, handling any errors
-- by exiting with an appropriate message and error status.
runIOorExplode :: PandocIO a -> IO a
runIOorExplode ma = runIO ma >>= handleError
newtype PandocIO a = PandocIO {
unPandocIO :: ExceptT PandocError (StateT CommonState IO) a
} deriving ( MonadIO
, Functor
, Applicative
, Monad
, MonadError PandocError
)
instance PandocMonad PandocIO where
lookupEnv = IO.lookupEnv
getCurrentTime = IO.getCurrentTime
getCurrentTimeZone = IO.getCurrentTimeZone
newStdGen = IO.newStdGen
newUniqueHash = IO.newUniqueHash
openURL = IO.openURL
readFileLazy = IO.readFileLazy
readFileStrict = IO.readFileStrict
glob = IO.glob
fileExists = IO.fileExists
getDataFileName = IO.getDataFileName
getModificationTime = IO.getModificationTime
getCommonState = PandocIO $ lift get
putCommonState = PandocIO . lift . put
logOutput = IO.logOutput
-- | Extract media from the mediabag into a directory.
extractMedia :: FilePath -> Pandoc -> PandocIO Pandoc
extractMedia = IO.extractMedia
|
