module Text.Pandoc.Lua.Module.MediaBag
( pushModule
) where
import Control.Monad (zipWithM_)
import Data.IORef (IORef, modifyIORef', readIORef)
import Data.Maybe (fromMaybe)
import Foreign.Lua (Lua, NumResults, liftIO)
import Text.Pandoc.Class (CommonState (..), fetchItem, putCommonState,
runIOorExplode, setMediaBag)
import Text.Pandoc.Lua.StackInstances ()
import Text.Pandoc.Lua.Util (OrNil (toMaybe), 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
pushModule :: CommonState -> IORef MB.MediaBag -> Lua NumResults
pushModule commonState mediaBagRef = do
Lua.newtable
addFunction "insert" (insertMediaFn mediaBagRef)
addFunction "lookup" (lookupMediaFn mediaBagRef)
addFunction "list" (mediaDirectoryFn mediaBagRef)
addFunction "fetch" (fetch commonState mediaBagRef)
return 1
insertMediaFn :: IORef MB.MediaBag
-> FilePath
-> OrNil MimeType
-> BL.ByteString
-> Lua NumResults
insertMediaFn mbRef fp nilOrMime contents = do
liftIO . modifyIORef' mbRef $
MB.insertMedia fp (toMaybe nilOrMime) contents
return 0
lookupMediaFn :: IORef MB.MediaBag
-> FilePath
-> Lua NumResults
lookupMediaFn mbRef fp = do
res <- MB.lookupMedia fp <$> liftIO (readIORef mbRef)
case res of
Nothing -> Lua.pushnil *> return 1
Just (mimeType, contents) -> do
Lua.push mimeType
Lua.push contents
return 2
mediaDirectoryFn :: IORef MB.MediaBag
-> Lua NumResults
mediaDirectoryFn mbRef = do
dirContents <- MB.mediaDirectory <$> liftIO (readIORef mbRef)
Lua.newtable
zipWithM_ addEntry [1..] dirContents
return 1
where
addEntry :: Int -> (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 :: CommonState
-> IORef MB.MediaBag
-> String
-> Lua NumResults
fetch commonState mbRef src = do
mediaBag <- liftIO $ readIORef mbRef
(bs, mimeType) <- liftIO . runIOorExplode $ do
putCommonState commonState
setMediaBag mediaBag
fetchItem src
Lua.push $ fromMaybe "" mimeType
Lua.push bs
return 2