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{- |
Module : Text.Pandoc.Filter.Lua
Copyright : Copyright (C) 2006-2021 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley@edu>
Stability : alpha
Portability : portable
Apply Lua filters to modify a pandoc documents programmatically.
-}
module Text.Pandoc.Filter.Lua (apply) where
import Control.Exception (throw)
import Control.Monad ((>=>))
import qualified Data.Text as T
import Text.Pandoc.Class (PandocMonad)
import Control.Monad.Trans (MonadIO)
import Text.Pandoc.Definition (Pandoc)
import Text.Pandoc.Error (PandocError (PandocFilterError, PandocLuaError))
import Text.Pandoc.Lua (Global (..), runLua, runFilterFile, setGlobals)
import Text.Pandoc.Options (ReaderOptions)
-- | Run the Lua filter in @filterPath@ for a transformation to the
-- target format (first element in args). Pandoc uses Lua init files to
-- setup the Lua interpreter.
apply :: (PandocMonad m, MonadIO m)
=> ReaderOptions
-> [String]
-> FilePath
-> Pandoc
-> m Pandoc
apply ropts args fp doc = do
let format = case args of
(x:_) -> x
_ -> error "Format not supplied for Lua filter"
runLua >=> forceResult fp $ do
setGlobals [ FORMAT $ T.pack format
, PANDOC_READER_OPTIONS ropts
, PANDOC_SCRIPT_FILE fp
]
runFilterFile fp doc
forceResult :: (PandocMonad m, MonadIO m)
=> FilePath -> Either PandocError Pandoc -> m Pandoc
forceResult fp eitherResult = case eitherResult of
Right x -> return x
Left err -> throw . PandocFilterError (T.pack fp) $ case err of
PandocLuaError msg -> msg
_ -> T.pack $ show err
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