Is there something like ipython for Haskell? GHCI is fine but some subtleties are missing. Like typing a prefix and going through a subset of the command history. And also the numpy/scipy/matplotlib toolkit that come with the -pylab option would be great!
Maybe it is possible to write a haskell mode for ipython? I watched Fernando and one of the Julia guys hack up communication between ipython and a Julia interpreter in an afternoon. Depending on how ghci is implemented it might not be much harder.