Getting started with mailutils as a library (GNU Guile bindings)

Héllo,

I am looking for stable featured imap client to bind in GNU Guile, I 
found GNU mailutils.

The library part is not documented yet, nonetheless there is plenty of 
use of the library
in mailutils itself.

Like I said I am primarily interested on the imap client. It seems to me 
that the general
workflow is to send request to using `mu_imap_*` functions found in 
mailutils/imap.h
and listen for response using `mu_imap_register_callback_function`. Is 
this correct?

For instance, there is the example code in libproto/imap/mbox.c [1] that 
does the following:

static int
_imap_fetch_with_callback (mu_imap_t imap, mu_msgset_t msgset, char *items,
                mu_imap_callback_t cb, void *data)
{
   int rc;

   mu_imap_register_callback_function (imap, MU_IMAP_CB_FETCH, cb, data);
   rc = mu_imap_fetch (imap, 0, msgset, items);
   mu_imap_register_callback_function (imap, MU_IMAP_CB_FETCH, NULL, NULL);
   return rc;
}

AFAIU the callback is unregistred immediatly after being registred. How 
can this properly work?

What's the purpose of:

void mu_imap_callback (mu_imap_t imap, int code, size_t sdat, void *pdat);

Thanks in advance!

[1] 
http://git.savannah.gnu.org/cgit/mailutils.git/tree/libproto/imap/mbox.c#n61

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