At the moment there is no way of getting the current pre_input_hook out
of the readline module, so applications cannot set_pre_input_hook
without possibly over-writing users settings (or other parts of the
applications settings) I have attached a patch that implements this
functionality.

It is probably not very useful in many situations, but I am now using it
to maintain my normal custom auto-indenting python prompt in a library
that allows me to edit arbitrary strings using readline. A better way to
implement this might be to

...wrap the current readline in a pure python module

I'm working on applying this patch cleanly and writing a test for this.

However, it seems I'm unable to import `readline` in compiled version of Python. I'm trying to provide a path to the installation of readline in my system using LDFLAGS, and then reconfiguring and recompiling, but seems like it didn't work.

Can someone provide me a pointer here, please?