On 1 September 2012 17:27, Dennis Felsing <den...@felsin9.de> wrote: > Hello, > > I'm pleased to announce the relase of ghc-vis. This package provides a > way to visualize live data structures in GHCi, similar to GHCi's :print > and vacuum-cairo. Evaluation is not forced and you can interact with the > visualized data structures. This allows seeing Haskell's lazy evaluation > and sharing in action. Hopefully it will be useful for teaching Haskell > and understanding and debugging data structures. > > Currently there's a linear view and a graph view using GraphViz. If you > want to see some examples of how it looks head to > > http://felsin9.de/nnis/ghc-vis/ > > or just give it a try like this: > > $ cabal install ghc-vis > $ echo ":script $HOME/.cabal/share/ghc-vis-0.2.1/ghci" >> ~/.ghci > $ ghci > GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help > λ> :vis > λ> let a = [1..3] > λ> :view a > λ> let b = cycle a > λ> :view b > λ> :view "foo" ++ "bar" > λ> :eval t1 > λ> :switch > > On Hackage: http://hackage.haskell.org/package/ghc-vis > > I'm happy to hear about bugs, feature requests and other thoughts. > > Dennis
In terms of your usage of graphviz, I have a couple of suggestions (as it's maintainer ;-) on how you can improve your code: * As of graphviz-2999.14.1.0, I've introduced isGraphvizInstalled and quitWithoutGraphviz to try and prevent closed pipe errors when you try to call dot when it isn't installed * I suggest you use either hGetDot or hGetStrict from Data.GraphViz.Commands.IO rather than hGetContents in your GHC.Vis.Graph.dg function (maybe -- Ivan Lazar Miljenovic ivan.miljeno...@gmail.com http://IvanMiljenovic.wordpress.com _______________________________________________ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell