Re: BUG #16059: Tab-completion of filenames in COPY commands removes required quotes

On 2019-Dec-13, Tom Lane wrote:

> I wrote:
> >> Alvaro Herrera <alvherre@2ndquadrant.com> writes:

> >>> #ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
> >>> #define filename_completion_function rl_filename_completion_function
> >>> #else
> >>> /* decl missing in some header files, but function exists anyway */
> >>> extern char *filename_completion_function();
> >>> #endif

> Looking closer at this, the "extern" could be got rid of, I think.
> prairiedog's readline header does have that extern, so it's hard to
> believe anybody is still using libedit versions that don't declare it.

Agreed.

> A possible further change is to switch the code over to calling
> "rl_filename_completion_function", and then invert the sense of
> this logic, like
> 
> /*
>  * Ancient versions of libedit provide filename_completion_function()
>  * instead of rl_filename_completion_function().
>  */
> #ifndef HAVE_RL_FILENAME_COMPLETION_FUNCTION
> #define rl_filename_completion_function filename_completion_function
> #endif
> 
> This would make it easier to compare our code to the readline
> documentation, so maybe it's helpful ... or maybe it's just
> churn.  Thoughts?

+1, I think that's clearer.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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