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{-
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
-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE FlexibleContexts #-}
{- |
Module : Text.Pandoc.Lua.Packages
Copyright : Copyright © 2017 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Pandoc module for lua.
-}
module Text.Pandoc.Lua.Packages
( LuaPackageParams (..)
, installPandocPackageSearcher
) where
import Control.Monad (forM_)
import Data.ByteString.Char8 (unpack)
import Data.IORef (IORef)
import Foreign.Lua (Lua, NumResults, liftIO)
import Text.Pandoc.Class (CommonState, readDataFile, runIO, setUserDataDir)
import Text.Pandoc.MediaBag (MediaBag)
import Text.Pandoc.Lua.Util (dostring')
import qualified Foreign.Lua as Lua
import Text.Pandoc.Lua.Module.Pandoc as Pandoc
import Text.Pandoc.Lua.Module.MediaBag as MediaBag
import Text.Pandoc.Lua.Module.Utils as Utils
-- | Parameters used to create lua packages/modules.
data LuaPackageParams = LuaPackageParams
{ luaPkgCommonState :: CommonState
, luaPkgDataDir :: Maybe FilePath
, luaPkgMediaBag :: IORef MediaBag
}
-- | Insert pandoc's package loader as the first loader, making it the default.
installPandocPackageSearcher :: LuaPackageParams -> Lua ()
installPandocPackageSearcher luaPkgParams = do
luaVersion <- Lua.getglobal "_VERSION" *> Lua.peek (-1)
if luaVersion == "Lua 5.1"
then Lua.getglobal' "package.loaders"
else Lua.getglobal' "package.searchers"
shiftArray
Lua.pushHaskellFunction (pandocPackageSearcher luaPkgParams)
Lua.wrapHaskellFunction
Lua.rawseti (-2) 1
Lua.pop 1 -- remove 'package.searchers' from stack
where
shiftArray = forM_ [4, 3, 2, 1] $ \i -> do
Lua.rawgeti (-1) i
Lua.rawseti (-2) (i + 1)
-- | Load a pandoc module.
pandocPackageSearcher :: LuaPackageParams -> String -> Lua NumResults
pandocPackageSearcher luaPkgParams pkgName =
case pkgName of
"pandoc" -> let datadir = luaPkgDataDir luaPkgParams
in pushWrappedHsFun (Pandoc.pushModule datadir)
"pandoc.mediabag" -> let st = luaPkgCommonState luaPkgParams
mbRef = luaPkgMediaBag luaPkgParams
in pushWrappedHsFun (MediaBag.pushModule st mbRef)
"pandoc.utils" -> pushWrappedHsFun Utils.pushModule
_ -> searchPureLuaLoader
where
pushWrappedHsFun f = do
Lua.pushHaskellFunction f
Lua.wrapHaskellFunction
return 1
searchPureLuaLoader = do
let filename = pkgName ++ ".lua"
modScript <- liftIO (dataDirScript (luaPkgDataDir luaPkgParams) filename)
case modScript of
Just script -> pushWrappedHsFun (loadStringAsPackage pkgName script)
Nothing -> do
Lua.push ("no file '" ++ filename ++ "' in pandoc's datadir")
return 1
loadStringAsPackage :: String -> String -> Lua NumResults
loadStringAsPackage pkgName script = do
status <- dostring' script
if status == Lua.OK
then return (1 :: NumResults)
else do
msg <- Lua.peek (-1) <* Lua.pop 1
Lua.push ("Error while loading ``" ++ pkgName ++ "`.\n" ++ msg)
Lua.lerror
return (2 :: NumResults)
-- | Get the string representation of the pandoc module
dataDirScript :: Maybe FilePath -> FilePath -> IO (Maybe String)
dataDirScript datadir moduleFile = do
res <- runIO $ setUserDataDir datadir >> readDataFile moduleFile
return $ case res of
Left _ -> Nothing
Right s -> Just (unpack s)
|
