use vertico completion also in evil's ex-prompt

Question

I am using evil-mode and now want to use vertico for completion. I've got it setup so it works when I hit M-x, C-x C-f, C-x C-b, etc. However, it doesn't work in evil's ex-prompt (the command prompt started by hitting :).

How do i tell vertico to also complete comands in the ex prompt?

Answer 1

I asked the same question on github, and this is the answer i got:

If you press TAB in the evil-ex prompt you will invoke completion-at-point. This command triggers in-buffer completion. Vertico doesn't directly support in-buffer completion, only minibuffer completion.

In order to still use Vertico as an in-buffer completion UI, you can use consult-completion-in-region from my Consult package. This function does nothing else than redirecting the in-buffer completion to the minibuffer. In this case, since we are already in a minibuffer, it will start a recursive minibuffer. Ivy does the same.

(setq completion-in-region-function 'consult-completion-in-region)

See https://github.com/minad/vertico#completion-at-point-and-completion-in-region for more details. As an alternative for in-buffer completion you could also try the Corfu completion UI, see then https://github.com/minad/corfu#completing-in-the-minibuffer.