Is there any plugin system for haskell? For example, in Java, I can load all compiled classes from given directory, check their interfaces and run some methods through reflection etc. Is it possible in haskell, to load modules from given directory, and if in module there is instance of class then return instantiation of that class?
I hope this is understandable what I'm trying to achieve here.
not really: the only classes in haskell are type classes, and if there is any class instance missing at compile time, you won't even get to runtime, so you don't have to worry about loading instances at runtime!-) perhaps you could describe the problem you are trying to solve, rather than the solution you would like to see? in general, ghci and hugs allow you to browse your modules, find out types and names, run tests, etc. ghci can be scripted to some extent (not always comfortably, but possibly sufficient if you only want to find and run all functions named test*, for instance), and if that isn't enough, ghc has an api that allows you to program your own variant of ghci, among other things. claus