I'm trying to figure out how to process a large number of files
(ByteStrings) in groups of, say 20, with the results of each group going to
a different output file.
For instance, I have:
theFiles :: Producer ByteString m r
processFile :: Handle -> ByteString -> IO ()
and for the first 20 ByteStrings I want the handle passed to processFile to
be opened to "output-1", and for the next 20 it should be opened to
"output-2", etc.
I'm sure I could write it in a very mundane fashion using Pipes.foldM, but
I'm sure there is a better way.
Thanks!
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