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|
{-# LANGUAGE NoImplicitPrelude #-}
{- |
Module : Text.Pandoc.Lua.Module.MediaBag
Copyright : Copyright © 2017-2019 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
The lua module @pandoc.mediabag@.
-}
module Text.Pandoc.Lua.Module.MediaBag
( pushModule
) where
import Prelude
import Control.Monad (zipWithM_)
import Data.Maybe (fromMaybe)
import Foreign.Lua (Lua, NumResults, Optional, liftIO)
import Text.Pandoc.Class (CommonState (..), fetchItem, putCommonState,
runIOorExplode, setMediaBag)
import Text.Pandoc.Lua.Marshaling ()
import Text.Pandoc.Lua.Util (addFunction)
import Text.Pandoc.MIME (MimeType)
import qualified Data.ByteString.Lazy as BL
import qualified Foreign.Lua as Lua
import qualified Text.Pandoc.MediaBag as MB
--
-- MediaBag submodule
--
pushModule :: Lua NumResults
pushModule = do
Lua.newtable
addFunction "insert" insertMediaFn
addFunction "lookup" lookupMediaFn
addFunction "list" mediaDirectoryFn
addFunction "fetch" fetch
return 1
--
-- Port functions from Text.Pandoc.Class to the Lua monad.
-- TODO: reuse existing functions.
-- Get the current CommonState.
getCommonState :: Lua CommonState
getCommonState = do
Lua.getglobal "PANDOC_STATE"
Lua.peek Lua.stackTop
-- Replace MediaBag in CommonState.
setCommonState :: CommonState -> Lua ()
setCommonState st = do
Lua.push st
Lua.setglobal "PANDOC_STATE"
modifyCommonState :: (CommonState -> CommonState) -> Lua ()
modifyCommonState f = getCommonState >>= setCommonState . f
insertMediaFn :: FilePath
-> Optional MimeType
-> BL.ByteString
-> Lua NumResults
insertMediaFn fp optionalMime contents = do
modifyCommonState $ \st ->
let mb = MB.insertMedia fp (Lua.fromOptional optionalMime) contents
(stMediaBag st)
in st { stMediaBag = mb}
return 0
lookupMediaFn :: FilePath
-> Lua NumResults
lookupMediaFn fp = do
res <- MB.lookupMedia fp . stMediaBag <$> getCommonState
case res of
Nothing -> Lua.pushnil *> return 1
Just (mimeType, contents) -> do
Lua.push mimeType
Lua.push contents
return 2
mediaDirectoryFn :: Lua NumResults
mediaDirectoryFn = do
dirContents <- MB.mediaDirectory . stMediaBag <$> getCommonState
Lua.newtable
zipWithM_ addEntry [1..] dirContents
return 1
where
addEntry :: Lua.Integer -> (FilePath, MimeType, Int) -> Lua ()
addEntry idx (fp, mimeType, contentLength) = do
Lua.newtable
Lua.push "path" *> Lua.push fp *> Lua.rawset (-3)
Lua.push "type" *> Lua.push mimeType *> Lua.rawset (-3)
Lua.push "length" *> Lua.push contentLength *> Lua.rawset (-3)
Lua.rawseti (-2) idx
fetch :: String
-> Lua NumResults
fetch src = do
commonState <- getCommonState
let mediaBag = stMediaBag commonState
(bs, mimeType) <- liftIO . runIOorExplode $ do
putCommonState commonState
setMediaBag mediaBag
fetchItem src
Lua.push $ fromMaybe "" mimeType
Lua.push bs
return 2 -- returns 2 values: contents, mimetype
|
