customizing comint

[rustom]

I'm trying to customize comint for a little-language interpreter {say
foo}.
The language includes a file -- say bar.foo -- by doing
>> include-file "bar.foo"

Now python-mode binds C-c C-c to py-execute-buffer which seems to be
doing some heavy-weight stuff and not really using anything from
comint. (AFAIK)

Is there some simple way of writing
(defun foo-execute-buffer (file)
:
:
which uses the comint functionality to make the foo interpreter do
include-file <file>

More generally is there any help on customizing comint?