Re: Readline completion example?

On Sat, Feb 18, 2017 at 11:35:27PM +0100, Pascal Bourguignon wrote:
> It looks like rl_completion_entry_function is not mentionned in
> clisp/modules/readline/readline.lisp and that no variable
> readline:completion-entry-function is present in the readline
> package.
> 
> Indeed, I don’t see how to specify the completions with the API
> defined in readline.lisp Perhaps it correspond to an older readline
> library version that didn’t have it? Perhaps the mechanism is
> preempted by clisp, since we can see that in the terminal, clisp has
> completion on the the symbol names (operators, variables), and shows
> the documentation of the operator when they are complete.
> 
> See init_streamvars in stream.d:
>   rl_attempted_completion_function = &lisp_completion_matches;
>   rl_completion_entry_function = &lisp_completion_more;
> 
> they call lisp_completion, which calls (SYS::COMPLETION text start end) in complete.lisp
> 
> So this would be the definitive example, and you could override this
> function, (unlocking the SYSTEM package to do so).  I guess your
> overriding function could determine whether you’re completing lisp
> input or user input and call the original sys::complete to complete
> lisp input.
> 
> It would be nice to provide a patch to this sys::completion with a
> hook so that applications may provide their own completions. (I
> would make it a per-stream hook).
> 
> -- 
> __Pascal J. Bourguignon__

I did review complete.lisp -- for me is too complex to start with
it. I am rather for user based example, not CLISP based which is for
developers. 

Jean

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