This might be of interest: http://pipes.yahoo.com/pipes/ Best, titto On Friday 22 June 2007 11:15:49 peterv wrote:
Hi,
Since nobody gave an answer on this topic, I guess it is insane to do it in Haskell (at least for a newbie)? :)
Thanks for any info, Peter
-----Original Message----- From: haskell-cafe-bounces@haskell.org [mailto:haskell-cafe-bounces@haskell.org] On Behalf Of peterv Sent: Wednesday, June 20, 2007 21:48 To: haskell-cafe@haskell.org Subject: [Haskell-cafe] "Graphical Haskell"
In the book "Haskell School of Expression", streams are nicely explained using a graphical flow graph.
This is also done more or less in http://research.microsoft.com/~simonpj/papers/marktoberdorf/Marktoberdorf.p p t to explain monads and other concepts.
I would like to create a program that allows you to create such flow graphs, and then let GHC generate the code and do type inference.
I found a paper where Haskell is used to create a GUI application with undo/redo etc for creating graphical Basian networks (http://www.cs.uu.nl/dazzle/f08-schrage.pdf), so this gave me confidence that I could it do all in Haskell.
Now, instead of generating Haskell code (which I could do first, would be easier to debug), I would like to directly create an AST, and use an Haskell API to communicate with GHC.
I already found out that GHC indeed has such an API, but how possible is this idea? Has this been done before? I only found a very old attempt at this, confusingly also called "Visual Haskell", see http://ptolemy.eecs.berkeley.edu/%7Ejohnr/papers/visual.html, but I can't find any source code for that project.
I did a similar project in C# that generated C++ code, so I've done it before, just not in Haskell.
Thanks a lot, Peter
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