[Haskell-cafe] ANNOUNCE: pipes-core 0.0.1

I'm pleased to announce the release of version 0.0.1 of pipes-core, a library for efficient, safe and compositional IO, similar in scope to iteratees and conduits. http://hackage.haskell.org/package/pipes-core This is a reimplementation of the original 'Pipe' concept by Gabriel Gonzales. The package documentation contains an introduction to Pipes and a detailed tutorial, so here I'll just outline some of the differences from the original version: - A single composition operator. "Strict" composition has been removed, since its role wasn't actually that clear, and its purpose for resource finalization has been replaced by better constructs (see below). - A new primitive 'tryAwait', which makes it possible to recover from termination of an upstream pipe. Using 'tryAwait' you can write pipes that are able to consume all their input and return a value (like iteratees or Conduit's sinks can), and stateful pipes that can make use of their final state before terminating. - Full exception safety and exception-handling primitives. Pipes have been augmented with 'catch' and 'finally' primitives, which allow you to recover from exceptions and ensure finalization of resources within the Pipe monad. There's no more need to use resource-simple or monadic regions together with Pipes. - Multi-channel pipes. This is a generalization of Arrows using sums instead of pairs for contexts. We provide a number of combinators that allow you to combine Pipes in much the same way as Arrows, although there is not unfortunately an alternative for the Arrow syntax. Together with pipes-core, I also released a number of accessory packages with various utilities. Here is a complete list: * pipes-extra: File readers and writers, chunk pipes. http://hackage.haskell.org/package/pipes-extra * pipes-attoparsec: Utilities to convert a parser into a pipe. http://hackage.haskell.org/package/pipes-attoparsec * pipes-conduit: Conduit adapters. http://hackage.haskell.org/package/pipes-conduit * pipes-network: Utilities to deal with sockets. Ported from conduit. http://hackage.haskell.org/package/pipes-network * pipes-zlib: Pipes to deal with zipped data. Ported from conduit. http://hackage.haskell.org/package/pipes-zlib This is an experimental release, but it should be equipped with all the functionality needed to write serious applications. I encourage people to try it out and send feedback if anything looks too simplistic or too limiting. BR, Paolo Capriotti