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|
{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE NoImplicitPrelude #-}
#ifdef DERIVE_JSON_VIA_TH
{-# LANGUAGE TemplateHaskell #-}
#endif
{- |
Module : Text.Pandoc.Filter
Copyright : Copyright (C) 2006-2019 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley@edu>
Stability : alpha
Portability : portable
Programmatically modifications of pandoc documents.
-}
module Text.Pandoc.Filter
( Filter (..)
, applyFilters
) where
import Prelude
#ifdef DERIVE_JSON_VIA_TH
import Data.Aeson.TH (deriveJSON, defaultOptions)
#else
import Data.Aeson (FromJSON (..), ToJSON (..),
defaultOptions, genericToEncoding)
#endif
import Data.Foldable (foldrM)
import GHC.Generics (Generic)
import Text.Pandoc.Class (PandocIO)
import Text.Pandoc.Definition (Pandoc)
import Text.Pandoc.Options (ReaderOptions)
import qualified Text.Pandoc.Filter.JSON as JSONFilter
import qualified Text.Pandoc.Filter.Lua as LuaFilter
import qualified Text.Pandoc.Filter.Path as Path
-- | Type of filter and path to filter file.
data Filter = LuaFilter FilePath
| JSONFilter FilePath
deriving (Show, Generic)
-- | Modify the given document using a filter.
applyFilters :: ReaderOptions
-> [Filter]
-> [String]
-> Pandoc
-> PandocIO Pandoc
applyFilters ropts filters args d = do
expandedFilters <- mapM expandFilterPath filters
foldrM ($) d $ map applyFilter expandedFilters
where
applyFilter (JSONFilter f) = JSONFilter.apply ropts args f
applyFilter (LuaFilter f) = LuaFilter.apply ropts args f
-- | Expand paths of filters, searching the data directory.
expandFilterPath :: Filter -> PandocIO Filter
expandFilterPath (LuaFilter fp) = LuaFilter <$> Path.expandFilterPath fp
expandFilterPath (JSONFilter fp) = JSONFilter <$> Path.expandFilterPath fp
#ifdef DERIVE_JSON_VIA_TH
$(deriveJSON defaultOptions ''Filter)
#else
instance ToJSON Filter where
toEncoding = genericToEncoding defaultOptions
instance FromJSON Filter
#endif
|
