@hackage pipes-transduce0.3.0.1

Whats in this library?

A pair of fold-like datatypes that consume Producers from pipes and can be constructed in a variety of ways, in particular from the more versatile folds in Gabriel Gonzalez's foldl package.

The Fold1 consumes a single Producer, while the Fold2 datatype consumes two Producers concurrently.

Why was this library created?

I wanted a fold-like datatype for IO-based Producers that let me perform "bracketing" operations (the folds in foldl are push-based and do not allow that).

I also wanted to be able to fold two Producers concurrently (for example, take the piped stdout & stderr streams of an external process and merge the lines into a single file as they are produced).

Finally, I wanted the fold-like datatype to have a "failure value" baked in.

If you don't need any of that, you are better off using pipes and/or foldl by themselves.

Where can I find working examples for this library?

There are none yet.