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{-# LANGUAGE CPP #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
{-
Copyright © 2017 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
-}
{- |
Module : Text.Pandoc.Lua
Copyright : Copyright © 2017 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Pandoc lua utils.
-}
module Text.Pandoc.Lua
( LuaException (..)
, LuaPackageParams (..)
, pushPandocModule
, runLuaFilter
, initLuaState
, luaPackageParams
) where
import Control.Monad (when, (>=>))
import Control.Monad.Identity (Identity)
import Control.Monad.Trans (MonadIO (..))
import Data.IORef (newIORef, readIORef)
import Foreign.Lua (FromLuaStack (peek), Lua, LuaException (..),
Status (OK), ToLuaStack (push))
import Text.Pandoc.Class (PandocIO, getCommonState, getMediaBag, setMediaBag)
import Text.Pandoc.Definition
import Text.Pandoc.Lua.Filter (LuaFilter, walkMWithLuaFilter)
import Text.Pandoc.Lua.Packages (LuaPackageParams (..),
installPandocPackageSearcher)
import Text.Pandoc.Lua.PandocModule (pushPandocModule) -- TODO: remove
import Text.Pandoc.Lua.Util (loadScriptFromDataDir)
import qualified Foreign.Lua as Lua
import qualified Foreign.Lua.Module.Text as Lua
runLuaFilter :: Maybe FilePath -> FilePath -> String
-> Pandoc -> PandocIO (Either LuaException Pandoc)
runLuaFilter datadir filterPath format pd = do
luaPkgParams <- luaPackageParams datadir
res <- liftIO . Lua.runLuaEither $
runLuaFilter' luaPkgParams filterPath format pd
newMediaBag <- liftIO (readIORef (luaPkgMediaBag luaPkgParams))
setMediaBag newMediaBag
return res
runLuaFilter' :: LuaPackageParams
-> FilePath -> String
-> Pandoc -> Lua Pandoc
runLuaFilter' luaPkgOpts filterPath format pd = do
initLuaState luaPkgOpts
-- store module in global "pandoc"
registerFormat
top <- Lua.gettop
stat <- Lua.dofile filterPath
if stat /= OK
then do
luaErrMsg <- peek (-1) <* Lua.pop 1
Lua.throwLuaError luaErrMsg
else do
newtop <- Lua.gettop
-- Use the implicitly defined global filter if nothing was returned
when (newtop - top < 1) pushGlobalFilter
luaFilters <- peek (-1)
runAll luaFilters pd
where
registerFormat = do
push format
Lua.setglobal "FORMAT"
luaPackageParams :: Maybe FilePath -> PandocIO LuaPackageParams
luaPackageParams datadir = do
commonState <- getCommonState
mbRef <- liftIO . newIORef =<< getMediaBag
return LuaPackageParams
{ luaPkgCommonState = commonState
, luaPkgDataDir = datadir
, luaPkgMediaBag = mbRef
}
-- Initialize the lua state with all required values
initLuaState :: LuaPackageParams -> Lua ()
initLuaState luaPkgParams = do
Lua.openlibs
Lua.preloadTextModule "text"
installPandocPackageSearcher luaPkgParams
loadScriptFromDataDir (luaPkgDataDir luaPkgParams) "init.lua"
pushGlobalFilter :: Lua ()
pushGlobalFilter = do
Lua.newtable
Lua.getglobal' "pandoc.global_filter"
Lua.call 0 1
Lua.rawseti (-2) 1
runAll :: [LuaFilter] -> Pandoc -> Lua Pandoc
runAll = foldr ((>=>) . walkMWithLuaFilter) return
instance (FromLuaStack a) => FromLuaStack (Identity a) where
peek = fmap return . peek
|
