In fact, Hood is just the module Debug.Observe.GHood just extends Debug.Observe with some more constructs to handle visualizations, for instance, it adds a temporal dimension to observations. This means that you can use the GHood cabal package nonetheless, and be able to use both GHood graphically or textually (the features of Hood). GHood gives you both. Whenever you use runO, it will call the Java applet with the graphical visualization but still output the textual trace from Hood. As an example, just import Debug.Observe (the GHood one), run ghci and type
runO $ print $ (length . observe "List Int" .concat) [[1,2],[3,4]]
I suggest you install the cabal package and try the sample module form the
Hood homepage:
http://www.haskell.org/hood/downloads/Main.hs
Feel free to ask for anything.
Cheers,
hugo
On Sat, Dec 6, 2008 at 9:59 PM, Simon Michael
Hugo Pacheco wrote:
The library also features the visualization of the intermediate data structure of hylomorphisms with GHood.
I hadn't come across GHood and Hood before, and they look quite a useful addition to the toolbox.
http://www.haskell.org/hood says "The current released version of HOOD is the July 2000 release, but there is also a patch to all HOOD to work with GHC 5.00.". The Observe.lhs there doesn't immediately work with current GHC. Has anyone got an updated version, or is this available in some more recent library or package ?
Or, I may have misunderstood, and Debug.Trace may do everything that Hood did. Still, a working Hood would be useful to get the nice visualisations of GHood.
Thanks - Simon
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