Actually, I may be quite wrong with the task. While duplexing the input is an interesting thing to do, actually I need to pipeline output of one consumer to another (outputting text after making some internal representation - with Show instance - with the parseData). The answer to this one should be easy, but I still do not see it. On 19 April 2011 20:10, Paul Sujkov wrote:

Hi haskellers,

I played a bit with the enumerator package, and I'm quite stuck with the question how to duplex data to two (or more) consumers using combinators from xml-enumerator (for example) package. What I mean is:

main = withFile "out.xml" WriteMode $ \h -> parseFile "in.xml" decodeEntities $ (joinI $ renderText $$ iterHandle h) >> (force "data required" parseData)

where parseData is a simple xml-enumerator parser. Combining consumers in such a way I can get text being output to the file "out.xml" (like in the example given) or parsed with parseData (if I switch the order of the consumers), but not both. Can anybody tell me how to make a pipe (input -> process -> output) to have text both parsed and then put back to the file? While pretty straightforward with the arrow approach, it doesn't seem obvious to me with the iteratees :(

-- Regards, Paul Sujkov

-- Regards, Paul Sujkov