This portion of haskell-mode (haskell-interactive-mode-eval-pretty) is what the UI for something like this could look like:
https://www.youtube.com/watch?v=pu9AGSOySlE This isn't an answer to your question, though, because expanding subparts of the output doesn't drive evaluation. It would be very cool, and quite possible, to have a variant of the Show typeclass that had output with such structured laziness. Another non-answer is to take a look at using vaccum[0] and vaccum-graphviz[1] together, to get an idea of the heap structure of unforced values. I've made a gist demonstrating how to use these to visualize the heap without forcing values[2]. This doesn't show any concrete values (as that would require some serious voodoo), but does show how the heap changes due to thunks being forced. -Michael [0] http://hackage.haskell.org/package/vacuum [1] http://hackage.haskell.org/package/vacuum-graphviz [2] https://gist.github.com/mgsloan/6068915 On Tue, Jul 23, 2013 at 7:30 PM, yi lu <zhiwudazhanjiang...@gmail.com>wrote: > I am wondering how can I ask ghci to show an infinite list wisely. > When I type > > *fst ([1..],[1..10])* > > The result is what as you may guess > > *1,2,3,4,...*(continues to show, cut now) > > How could I may ghci show > > *[1..]* > > this wise way not the long long long list itself? > > Yi > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > >
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