[IPython-dev] ipython embedded in twisted, no threads

[Stefan Rank]

Hi,
[apologies if this arrives twice, posting via gmane didn't work - yet.]

attached is an ugly first attempt at embedding IPython in a twisted
application without using threads.

twisted.internet.stdio and a LineReceiver implementation are responsible
for getting input events.
I had to subclass the IPython shell and rearrange code to
create a non-blocking callback interface (splitting on the main,
blocking, raw_input call).

It's far from perfect: readline functionality is missing (no commandline
navigation, history navigation, completion), and sometimes continuation
lines eat the input counter (In[2] ... In[4]).

Would IPython developers be interested in patches that allow a less ugly
version of such a callback-friendly subclass? ;-)
The basic idea: refactor the main loop (InteractiveShell.interact) to::

    setup()
    while ...:
        promptforline()
        raw_input
        handleline()
    teardown()

(I think it might also be interesting for the frontend to the IPython
parallel computing effort, which uses twisted.)

cheers,
stefan

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