[Hat] Control.Monad.State

[Olaf Chitil]

Isaac,

> However, I still cannot debug my program because the interface files
> for Control.Monad.State are not there.  Is there a good way to
> generate these files, or are they distributed seperately?

There should be a simple way to add any hierarchical library (that
conforms to the Haskell 98 plus some extensions language supported by
Hat). I note this item on our todo list; thank you for pointing it out. 

To solve your immediate problem there are two ways you could go:

Malcolm recently added several Control.Monad.* libraries to Hat. So you
can download the CVS version and build and install it.

Alternatively (or if you need more libraries), you can add a library
yourself. It unfortunately requires some work:

Basically, libraries are transformed and compiled like any other module,
except that Hat expects the interface file *.hx in a certain place and
the object code to be part of the package "hat".

I suppose the easiest way is to extend your source tree of Hat and
modify a Makefile, so that rebuilding and reinstalling adds the
libraries you miss.

In the Hat source tree you find the directory "src/hatlib". The
directory plus subdirectory contains a copy of the hierarchical
libraries supported by Hat. You just add the libraries you want in the
right directories. Then you need to extend the Makefile in "src/hatlib".
You need to add the modules to either
GHCONLYSRCS or TRANSSRCS (if suitable for any compiler). Then rebuilding
and reinstalling should do the trick.

I hope this helps,
Olaf

-- 
OLAF CHITIL, 
 Dept. of Computer Science, The University of York, York YO10 5DD, UK. 
 URL: http://www.cs.york.ac.uk/~olaf/
 Tel: +44 1904 434756; Fax: +44 1904 432767