Matthew Danish wrote:
On Thu, May 10, 2007 at 09:34:53AM +0100, Simon Marlow wrote:
And we do have support for this in GHC.
$ ghci ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.7, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help.
Loading package base ... linking ... done. Prelude> :m + System.IO Prelude System.IO> h <- openFile "out" WriteMode {handle: out} Prelude System.IO> GHC.Handle.hDuplicateTo h stdout -- as this point, GHCi goes quiet: I type ":quit" $ cat out Prelude System.IO> :quit Leaving GHCi.
Cheers, Simon
Is there any way to create a handle which dumps its input into a string or memory buffer of some kind? I only know of the ability to open file/socket handles, and a quick browse of GHC/Handle.hs doesn't seem to indicate anything else. I'm not counting createPipe/fdToHandle because that is not portable.
Sadly not at the moment. Our Handle implementation is currently always backed by a file descriptor. It would certainly be possible (though not easy) to extend it in this direction. Cheers, Simon