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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.Global (Global (..), setGlobals)
import Text.Pandoc.Lua.Filter (LuaFilter, walkMWithLuaFilter)
import Text.Pandoc.Lua.Init (LuaException (..), runPandocLua)
import Text.Pandoc.Lua.Util (dofileWithTraceback)
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 $ do
setGlobals globals
top <- Lua.gettop
stat <- dofileWithTraceback 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 doc
where
globals = [ FORMAT format
, PANDOC_READER_OPTIONS ropts
, PANDOC_SCRIPT_FILE filterPath
]
runAll :: [LuaFilter] -> Pandoc -> Lua Pandoc
runAll = foldr ((>=>) . walkMWithLuaFilter) return
|
