[Haskell-cafe] MIDI-controlled application

[Yves Parès]

If you're afraid of Yampa (I was ;p), Ertugrul Söylemez released recently
the Netwire <http://hackage.haskell.org/package/netwire-3.1.0> library on
hackage.
I went through its internals and I find it simpler to grasp and to use than
Yampa as Ertugrul chose to replace the switch functions by the use of
ArrowChoice. Yet I don't know if the latter wholly supersedes the former.
Plus I like the fact it doesn't depend on IO (you can handle automatons in
pure code).

And if you're to stick with Yampa, you might wanna look at
Animas.<http://hackage.haskell.org/package/Animas-0.2>
It's a fork of Yampa. I don't the advantages it brings or what I changes,
but its documentation on hackage is far more complete.

2011/12/27 Tim Baumgartner <baumgartner.tim at googlemail.com>

> Hi Haskellers!
>
> I'm writing my first non-trivial Haskell application. I have an electronic
> drum set that generates MIDI events that I process with Haskell. A simple
> application of this kind might have fixed drums associated with fixed
> commands (I've done that). The next step would be to display menus (with
> very large font...) that show commands and the associated drums. The menu
> structure should be derived from the commands active in each context. Up to
> this point, I implemented this already in Java. But now after some
> successful attempts in Haskell, I plan for more features: the user should
> ultimately be able to record his own "triggers", i.e. short drum rhythms,
> and associate them with actions. Since I'm still a beginner with only some
> basic experience in Monads, Arrows and their transformers, there is
> infinite knowledge to be gained by working on this problem (both library
> and concrete apps).
>
> Currently I'm using a monad that combines Parsec (with MIDI event stream)
> and a Writer (that writes commands that should result in IO). It's done in
> a way that during running the monad, many parses can be done and failing
> parses roll back the parser state so that a new parse can be tried.
>
> Now my questions:
> I have read about Yampa, but I have not mastered it yet. E.g. I don't
> understand switches. Could my "triggers" be realized with Yampa's events
> and switches?
> Would you recommend any other approach?
> Is there something similar somewhere?
>
> Regards
> Tim
>
>
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