> Alternatively, you could use the python bindings to libnotmuch and call
> the functions directly. You could do that in a unthreaded or threaded
> fashion...

I've had a look to the python libnotmuch documentation. My problem
with this API is that, unless I did not read it correctly, if I use
one of its functions in a threaded fashion, I still have to wait for
this function to finish until I get results. When using the command
line tool, I can process the text as it gets printed on stdout, and I
have data to show to the user even though notmuch has not finished to
output it...