On 12-01-28 06:56 AM, Felipe Almeida Lessa wrote:
On Sat, Jan 28, 2012 at 9:40 AM, Yves Parès<yves.pa...@gmail.com> wrote:
I think there is still no consensus on which iteratee library is the one
to use. There are at least iteratee, enumerator, iterIO, conduit, and
pipes. The reusability of your libary depends on the choice of
iteratee-style library you select.
Yes, and IMO this is a growing problem. Since iteratees were designed, a lot
of different libraries providing this kind of service have appeared.
Of course they all have advantages and inconvenients, but some libraries
that could be compatible are not, because they rely on a different
iteratee-ish package. For instance pipes (as its documentation states) is
really like iteratee... but with more concrete names. Still it's sufficient
to break compatibility.
In principle it's possible to have some code that converts functions
between these different iteratee packages -- at least between
iteratee, enumerator and iterIO since these seem to have more or less
the same implementation ideas.
It's not only possible, it's done. The coroutine-enumerator and
coroutine-iteratee packages convert to and from the enumerator and
iteratee packages, using monad-coroutine as a bridge. The conversions
are bare-bone, and I don't know if anybody has ever used them in
practice. They still prove the concept.
> Converting from pipes may be possible, but to pipes seems pretty
> difficult since pipes sweeps IO under the rug.
A Pipe appears to be just a specialized Coroutine from the
monad-coroutine package with its type arguments expanded, so it would
also be convertible.
--
Mario Blazevic
mblaze...@stilo.com
Stilo International
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