[Haskell-beginners] Re: Talking betwean the parsers.

[Maciej Piechotka]

Felipe Lessa <felipe.lessa <at> gmail.com> writes:

> 
> On Sat, Jul 18, 2009 at 12:40:15AM +0200, Maciej Piechotka wrote:
> > I have a data structure of
> > data Monad m => NntpConnection m = NntpConnection {
> > 	input :: ByteString,
> > 	output :: ByteString -> m ()
> >     }
> >
> > I'd like to create echo structure such that the goes to output is going
> > to (lazy) input. For sure it is possible to use network and IO monad -
> > is is possible to do it purely?
> 
> In words, not code: you may create a Chan of strict ByteStrings.
> On the output side you just append all the chunks of the lazy
> ByteString to the Chan, or you may copy the lazy ByteString in
> one chunk of strict ByteString.  On the input side you
> "getContents" and "fromChunks".  Should work, I guess.
> 
> --
> Felipe.
> 

Sorry - I don't follow:
1. How the output is suppose to get into input?
2. Why combine getContents and fromChunks if getContents is overloaded for
ByteString?
3. How to use getContents without IO - either network or posix pipe?

Regards