[Haskell-cafe] Efficient way to edit a file
Donald Bruce Stewart
dons at cse.unsw.edu.au
Thu Jun 1 22:07:34 EDT 2006
> I need to edit big text files (5 to 500 Mb). But I just need to
> change one or two small lines, and save it. What is the best way to do
> that in Haskell, without creating copies of the whole files?
I'd think maybe a lazy bytestring would be ok.
B.putStr . B.unlines . B.map edit . B.lines =<< B.getContents
in the darcs version of Data.ByteString, here, http://www.cse.unsw.edu.au/~dons/fps.html
Let me know how you go, it would make a good benchmark.
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