how-to use readline.set_completion_display_matches_hook()?

Jean-Pierre Miceli j-p at
Thu Nov 8 06:53:09 CET 2012


I will try rl. 

Have a nice day

Le 7 nov. 2012 à 14:14, Stefan H. Holek a écrit :

> On 07.11.2012, at 11:36, Jean-Pierre Miceli wrote:
>> Hi all,
>> I'm working on a tool which enable support of tab completion using the
>> readline modul.
>> And I have a problem with set_completion_display_matches_hook function
>> I've created a display hook function and registered it. It is called
>> and it prints the desire messages. But once it has completed,
>> readline/python does not display the prompt.
>> I've got to press the 'return' key to see the prompt again.
>> What should the display hook function do to return correctly and let
>> the prompt be displayed?
>> Example:
>> def completerHook(self, substitution, matches, longest_match_length):
>>   print ""
>>   print "Test of the display hook function"
>>   for i in range(len(matches)):
>>     print matches[i],
>> I use Python 2.7.3 and done some tests on Mac OS 10.7 (Lion) and
>> Ubuntu. I got the same issue on both system.
> This always happens when you print newlines behind readline's back. To update the prompt area, you'd have to call rl_forced_update_display() which is AFAIK not exposed by the stdlib's readline bindings.
> There is a more complete implementation of the GNU Readline APIs at With rl you can fix the prompt by calling rl.readline.redisplay(force=True) after the hook has returned.
> Hope this helps,
> Stefan
> -- 
> Stefan H. Holek
> stefan at

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