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|
{-# LANGUAGE OverloadedStrings #-}
{- |
Module : Text.Pandoc.Lua.Module.MediaBag
Copyright : Copyright © 2017-2020 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 Control.Monad (zipWithM_)
import Foreign.Lua (Lua, NumResults, Optional, liftIO)
import Text.Pandoc.Class.CommonState (CommonState (..))
import Text.Pandoc.Class.PandocIO (runIOorExplode)
import Text.Pandoc.Class.PandocMonad (fetchItem, putCommonState, setMediaBag)
import Text.Pandoc.Lua.Marshaling ()
import Text.Pandoc.Lua.Marshaling.MediaBag (pushIterator)
import Text.Pandoc.Lua.Util (addFunction)
import Text.Pandoc.MIME (MimeType)
import qualified Data.ByteString.Lazy as BL
import qualified Data.Text as T
import qualified Foreign.Lua as Lua
import qualified Text.Pandoc.MediaBag as MB
--
-- MediaBag submodule
--
pushModule :: Lua NumResults
pushModule = do
Lua.newtable
addFunction "delete" delete
addFunction "empty" empty
addFunction "insert" insertMediaFn
addFunction "items" items
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
-- | Delete a single item from the media bag.
delete :: FilePath -> Lua NumResults
delete fp = 0 <$ modifyCommonState
(\st -> st { stMediaBag = MB.deleteMedia fp (stMediaBag st) })
-- | Delete all items from the media bag.
empty :: Lua NumResults
empty = 0 <$ modifyCommonState (\st -> st { stMediaBag = mempty })
-- | Insert a new item into the media bag.
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
-- | Returns iterator values to be used with a Lua @for@ loop.
items :: Lua NumResults
items = getCommonState >>= pushIterator . stMediaBag
lookupMediaFn :: FilePath
-> Lua NumResults
lookupMediaFn fp = do
res <- MB.lookupMedia fp . stMediaBag <$> getCommonState
case res of
Nothing -> 1 <$ Lua.pushnil
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" :: T.Text) *> Lua.push fp *> Lua.rawset (-3)
Lua.push ("type" :: T.Text) *> Lua.push mimeType *> Lua.rawset (-3)
Lua.push ("length" :: T.Text) *> Lua.push contentLength *> Lua.rawset (-3)
Lua.rawseti (-2) idx
fetch :: T.Text
-> Lua NumResults
fetch src = do
commonState <- getCommonState
let mediaBag = stMediaBag commonState
(bs, mimeType) <- liftIO . runIOorExplode $ do
putCommonState commonState
setMediaBag mediaBag
fetchItem src
Lua.push $ maybe "" T.unpack mimeType
Lua.push bs
return 2 -- returns 2 values: contents, mimetype
|
