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|
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeApplications #-}
{- |
Module : Text.Pandoc.Lua.Packages
Copyright : Copyright © 2017-2021 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
( installPandocPackageSearcher
) where
import Control.Monad (forM_)
import Text.Pandoc.Error (PandocError)
import Text.Pandoc.Lua.PandocLua (PandocLua, liftPandocLua, loadDefaultModule)
import qualified HsLua as Lua
import qualified HsLua.Module.Path as Path
import qualified HsLua.Module.Text as Text
import qualified Text.Pandoc.Lua.Module.Pandoc as Pandoc
import qualified Text.Pandoc.Lua.Module.MediaBag as MediaBag
import qualified Text.Pandoc.Lua.Module.System as System
import qualified Text.Pandoc.Lua.Module.Types as Types
import qualified Text.Pandoc.Lua.Module.Utils as Utils
-- | Insert pandoc's package loader as the first loader, making it the default.
installPandocPackageSearcher :: PandocLua ()
installPandocPackageSearcher = liftPandocLua $ do
Lua.getglobal' "package.searchers"
shiftArray
Lua.pushHaskellFunction $ Lua.toHaskellFunction pandocPackageSearcher
Lua.rawseti (Lua.nth 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 :: String -> PandocLua Lua.NumResults
pandocPackageSearcher pkgName =
case pkgName of
"pandoc" -> pushWrappedHsFun $ Lua.toHaskellFunction @PandocError Pandoc.pushModule
"pandoc.mediabag" -> pushModuleLoader MediaBag.documentedModule
"pandoc.path" -> pushModuleLoader Path.documentedModule
"pandoc.system" -> pushModuleLoader System.documentedModule
"pandoc.types" -> pushModuleLoader Types.documentedModule
"pandoc.utils" -> pushModuleLoader Utils.documentedModule
"text" -> pushModuleLoader Text.documentedModule
"pandoc.List" -> pushWrappedHsFun . Lua.toHaskellFunction @PandocError $
loadDefaultModule pkgName
_ -> reportPandocSearcherFailure
where
pushModuleLoader mdl = liftPandocLua $ do
Lua.pushHaskellFunction $
Lua.NumResults 1 <$ Lua.pushModule @PandocError mdl
return (Lua.NumResults 1)
pushWrappedHsFun f = liftPandocLua $ do
Lua.pushHaskellFunction f
return 1
reportPandocSearcherFailure = liftPandocLua $ do
Lua.push ("\n\t" <> pkgName <> " is not one of pandoc's default packages")
return (Lua.NumResults 1)
|
