[Haskell-cafe] ANNOUNCE: pipes-core 0.0.1

Mario Blažević blamario at acanac.net
Sun Mar 11 00:09:17 CET 2012

On 12-03-10 05:19 PM, Twan van Laarhoven wrote:
> On 2012-03-10 11:16, Paolo Capriotti wrote:
>> Another issue is how to deal with unconsumed input. For that, there is
>> a ChunkPipe type (in pipes-extra) with a specialized monad instance
>> that threads unconsumed input along. You can see an example of
>> ChunkPipe in action in this prototype http server by Jeremy Shaw:
>> http://src.seereason.com/pipes-http-2/pipes-http-2/. Note that this is
>> based on a old version of pipes-core, however.
> A nice way to deal with unconsumed input (from a user's perspective) 
> would be a function
>     -- | Pass some unconsumed input back upstream.
>     --   The next @await@ will return this input without blocking.
>     unawait :: Monad m => a -> Pipe a b m ()

     The function may be called unawait, but there's nothing stopping 
you from inserting something into the stream that wasn't in the input to 
start with. I find that this approach breaks too many invariants.

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