input hook is never called

[mguijarr]

First of all, a million thanks for prompt-toolkit and ptpython 👍

I am trying to have a custom input hook getting called within a custom ptpython-based shell.
I followed instructions here: https://python-prompt-toolkit.readthedocs.io/en/stable/pages/advanced_topics/input_hooks.html?highlight=input%20hook
But, I must be doing something wrong : the custom hook is never called.

Here is an example to reproduce the problem with latest ptpython (3.0.16) and prompt toolkit (3.0.18):

Python 3.7.10 (default, Feb 26 2021, 18:47:35) 
[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from ptpython.repl import PythonRepl
>>> from prompt_toolkit.eventloop import set_eventloop_with_inputhook
>>> def my_hook(hook_context):
...   breakpoint() #this is just to see if this will be executed
... 
>>> set_eventloop_with_inputhook(my_hook)
<_UnixSelectorEventLoop running=False closed=False debug=False>
>>> pr=PythonRepl()
>>> pr.run()
>>> ... whatever I try, no breakpoint => my_hook is never called ...

Any idea what I am doing wrong ? Or maybe there is a bug here ?

My final goal is to have gevent loop integrated within the ptpython shell. My input hook would execute a gevent select on the file descriptor... (hope this can work).

In the past, I did this with custom event loop (see prompt-toolkit/ptpython#130) but since async io, I feel a bit desperate.

EDIT: gevent integration can be done quite easily in fact, by using aiogevent and calling asyncio.run(pr.run_async()) instead of run().