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-rw-r--r--src/Text/Pandoc/Lua.hs31
1 files changed, 20 insertions, 11 deletions
diff --git a/src/Text/Pandoc/Lua.hs b/src/Text/Pandoc/Lua.hs
index 3770880f3..2ee8d0847 100644
--- a/src/Text/Pandoc/Lua.hs
+++ b/src/Text/Pandoc/Lua.hs
@@ -196,17 +196,26 @@ runFilterFunction :: StackValue a => LuaState -> LuaFilterFunction -> a -> IO a
runFilterFunction lua lf x = do
pushFilterFunction lua lf
Lua.push lua x
- Lua.call lua 1 1
- resType <- Lua.ltype lua (-1)
- case resType of
- Lua.TNIL -> Lua.pop lua 1 *> return x
- _ -> do
- mbres <- Lua.peek lua (-1)
- case mbres of
- Nothing -> throwIO $ LuaException
- ("Error while trying to get a filter's return "
- ++ "value from lua stack.")
- Just res -> res <$ Lua.pop lua 1
+ z <- Lua.pcall lua 1 1 0
+ if (z /= 0)
+ then do
+ msg <- Lua.peek lua (-1)
+ let prefix = "Error while running filter function: "
+ throwIO . LuaException $
+ case msg of
+ Nothing -> prefix ++ "could not read error message"
+ Just msg' -> prefix ++ msg'
+ else do
+ resType <- Lua.ltype lua (-1)
+ case resType of
+ Lua.TNIL -> Lua.pop lua 1 *> return x
+ _ -> do
+ mbres <- Lua.peek lua (-1)
+ case mbres of
+ Nothing -> throwIO $ LuaException
+ ("Error while trying to get a filter's return "
+ ++ "value from lua stack.")
+ Just res -> res <$ Lua.pop lua 1
-- | Push the filter function to the top of the stack.
pushFilterFunction :: Lua.LuaState -> LuaFilterFunction -> IO ()