conduit

How do you save a file using conduit's library? I looked through conduit's tutorial but can't seem to find anything, here is my use case: main :: IO () main = do xxs <- lines <$> (readFile filePath) sourceList xxs =$ pipe $$ saveFile pipe :: Monad m => Conduit String m String pipe = undefined So there's two question here: Does it make sense to use lines to convert a string into a list of strings and then feeding it to sourceList ? How should I implement the saveFile function so that when the strings xxs are fully processed, I can write it to disk? A small minimal example of what you are trying

I'm struggling converting a Response from http-conduit to an XML document via xml-conduit. The doPost function takes an XML Document and posts it to the server. The server responds with an XML Document. doPost queryDoc = do runResourceT $ do manager <- liftIO $ newManager def req <- liftIO $ parseUrl hostname let req2 = req { method = H.methodPost , requestHeaders = [(CI.mk $ fromString "Content-Type", fromString "text/xml" :: Ascii) :: Header] , redirectCount = 0 , checkStatus = \_ _ -> Nothing , requestBody = RequestBodyLBS $ (renderLBS def queryDoc) } res <- http req2 manager return $ res

Function runTCPClient from network-conduit has the following signature: runTCPClient :: (MonadIO m, MonadBaseControl IO m) => ClientSettings m -> Application m -> m () MonadIO m provides liftIO :: IO a -> m a and MonadBaseControl IO m provides liftBase :: IO a -> m a There is no visible difference. Do they provide the same functionality? If yes, why the duplication in the type signature? If not, what's the difference? liftBase is part of MonadBase which is a generalization of MonadIO for any base monad and, as you said, MonadBase IO provides the same functionality as MonadIO . However,

I am writing application which will download some files by HTTP. Up to some point I was using following code snippet to download page body: import network.HTTP simpleHTTP (getRequest "http://www.haskell.org/") >>= getResponseBody It was working fine but it could not establish connection by HTTPS protocol. So to fix this I have switched to HTTP-Conduit and now I am using following code: simpleHttp' :: Manager -> String -> IO (C.Response LBS.ByteString) simpleHttp' manager url = do request <- parseUrl url runResourceT $ httpLbs request manager It can connect to HTTPS but new frustrating problem

I write a program which counts the frequencies of NGrams in a corpus. I already have a function that consumes a stream of tokens and produces NGrams of one single order: ngram :: Monad m => Int -> Conduit t m [t] trigrams = ngram 3 countFreq :: (Ord t, Monad m) => Consumer [t] m (Map [t] Int) At the moment i just can connect one stream consumer to a stream source: tokens --- trigrams --- countFreq How do I connect multiple stream consumers to the same stream source? I would like to have something like this: .--- unigrams --- countFreq |--- bigrams --- countFreq tokens ----|--- trigrams ---