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What's in this library?
Stateful transducers and streaming-preserving group operations for the folds in Gabriel Gonzalez's foldl package.
When to use this library?
When you want to wrap a stateful decoder over a Fold. An example is decoding UTF-8: the decoder must be stateful because a multi-byte character may have been split across two blocks of bytes.
When you want to tweak the stream of data that arrives into a Fold, but only at certain positions. Stripping whitespace at the beginning of a text stream, for example.
When you want to perform group operations without breaking "streaminess", similar to what pipes-group does.
Why use this library for grouping instead of pipes-group?
Grouping fold-side instead of producer-side has the advantage that, since the results are still Folds, you can combine them using Applicative.
Also, Folds can work with sources other than Producers from pipes.
Grouping fold-side has limitations as well:
You can't perform bracketing operations like "withFile" that span the folding of an entire group. pipes-group allows them.
You have more flexibility in pipes-group to decide how to delimit and fold the next group based on previous results.
Where can I find working examples for this library?
In the examples folder of the repo.