Peter Hercek wrote:

...

Is there a way to redirect output of a ghci debugger command so that I can process it with a (ghci) script before it is displayed?

Claus had some GHCi macros for doing this sort of thing. Claus?

Sure, recorded here (sections 4/5, but the rest of the page should also be better known; if only so that others would add their tips and tricks as well; hmm, ghc-haskeline isn't there, yet): http://www.haskell.org/haskellwiki/GHC/GHCi#Using_.ghci.2C_a_mini-tutorial Some of the items mentioned in the tutorial email have since been added to GHCi, but I still use the :grep, :redir, and :ghc_pkg stuff; :redir(Err) only works properly if -fbreak-on-exceptions is not switched on, haven't investigated workarounds yet. There is also a stub page for the GHCi debugger, nothing on it yet: http://www.haskell.org/haskellwiki/GHC/GHCi_debugger Claus