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{-
Copyright © 2017–2018 Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{-# LANGUAGE NoImplicitPrelude #-}
{- |
Module : Text.Pandoc.Lua
Copyright : Copyright © 2017–2018 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Running pandoc Lua filters.
-}
module Text.Pandoc.Lua
( LuaException (..)
, runLuaFilter
, runPandocLua
) where
import Prelude
import Control.Monad ((>=>))
import Foreign.Lua (Lua)
import Text.Pandoc.Class (PandocIO)
import Text.Pandoc.Definition (Pandoc)
import Text.Pandoc.Lua.Filter (LuaFilter, walkMWithLuaFilter)
import Text.Pandoc.Lua.Init (LuaException (..), runPandocLua, registerScriptPath)
import Text.Pandoc.Options (ReaderOptions)
import qualified Foreign.Lua as Lua
-- | Run the Lua filter in @filterPath@ for a transformation to target
-- format @format@. Pandoc uses Lua init files to setup the Lua
-- interpreter.
runLuaFilter :: ReaderOptions -> FilePath -> String
-> Pandoc -> PandocIO (Either LuaException Pandoc)
runLuaFilter ropts filterPath format doc =
runPandocLua (runLuaFilter' ropts filterPath format doc)
runLuaFilter' :: ReaderOptions -> FilePath -> String
-> Pandoc -> Lua Pandoc
runLuaFilter' ropts filterPath format pd = do
registerFormat
registerReaderOptions
registerScriptPath filterPath
top <- Lua.gettop
stat <- Lua.dofile filterPath
if stat /= Lua.OK
then Lua.throwTopMessage
else do
newtop <- Lua.gettop
-- Use the returned filters, or the implicitly defined global filter if
-- nothing was returned.
luaFilters <- if newtop - top >= 1
then Lua.peek Lua.stackTop
else Lua.pushglobaltable *> fmap (:[]) Lua.popValue
runAll luaFilters pd
where
registerFormat = do
Lua.push format
Lua.setglobal "FORMAT"
registerReaderOptions = do
Lua.push ropts
Lua.setglobal "PANDOC_READER_OPTIONS"
runAll :: [LuaFilter] -> Pandoc -> Lua Pandoc
runAll = foldr ((>=>) . walkMWithLuaFilter) return
|
