Hello list,
I have a Producer of the following type:
blockProducer :: Handle -> Producer Block IO ()
which reads Blocks from a file with the given handle, and yields a block
one-by-one until EOF is reached.
I also have a function of the following type:
processBlock :: BlockState -> Block -> Either String BlockState
which takes an initial BlockState, and updates it with Block, and returns
either Right BlockState if no error occurs, or Left String if an error
occurs.
So I want to create a Pipe that consumes Blocks from blockProducer, folds
them as if I were using (foldlM processBlock), and yields the resulting
Either String BlockState.
How do I do that?
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