Re: TAGS completion with (setq-local completion-ignore-case t)

[Morgan Willcock <morgan@ice9.digital>]

Eli Zaretskii <eliz@gnu.org> writes:

>> > Why exactly do you need to have a buffer-local value of
>> > completion-ignore-case?  This is not a user option, and is meant to be
>> > either set globally or let-bound for specific code.
>>
>> I was using it as a configuration example for a major-mode setup hook,
>> where the language itself is not case-sensitive, but completions through
>> capf functions (including TAG completion) can be displayed and inserted
>> in mixed case.
>>
>> Is there a supported way to have user configurable case-insensitive
>> completion that is configured per major mode?
>
> use the user options specific for each type of completion, I'd say.
> For TAGS that's tags-case-fold-search; for file names that's
> read-file-name-completion-ignore-case; for buffers its
> read-buffer-completion-ignore-case.  And there may be others.
>
> Stefan, any better ideas?

I've tested wrapping the capf functions with Cape's cape-capf-case-fold
transformer.  This seems to give the ideal result for the actual
completions and is fine to be restricted to the major-mode (the wrapped
version is just another capf function which can be buffer-local).

https://elpa.gnu.org/packages/cape.html

I'll likely stick with this solution because it works so well, but thank
you for looking at the built-in options.

-- 
Morgan Willcock