bug#66755: 30.0.50; how do i lookup a key but also respect key translations?

[Eli Zaretskii <eliz@gnu.org>]

> From: StrawberryTea <look@strawberrytea.xyz>
> Date: Wed, 25 Oct 2023 22:57:58 -0500
> 
> 
> Hello. So I am trying to define a function which obtains the command
> that would be called if 'corfu-mode' was not enabled:
> 
> (defun +corfu--get-passthrough-command ()
>   (keymap-lookup
>    (thread-last
>      (current-active-maps t)
>      (delq corfu-map)
>      (delq (and (featurep 'evil)
>                 (evil-get-auxiliary-keymap corfu-map evil-state))))
>    (key-description (this-command-keys-vector))))
> 
> But the issue is basically that
> 
> (keymap-lookup (current-active-maps t)
>     (key-description (vector 'backspace)))
> 
> returns nil whereas
> 
> (keymap-lookup (current-active-maps t) (key-description (vector ?\C-?)))
> 
> returns 'lispy-delete-backward' which is the command I actually want
> returned. When I run 'describe-key-briefly' and type <backspace>, I get
> 
> DEL (translated from <backspace>) runs the command lispy-delete-backward
> 
> but I don't know how to look up that translation from Elisp. I looked at
> the code for 'help.el' and found the above description comes from
> 'read-key-sequence' returning 'C-?' and 'this-single-command-raw-keys'
> returning '[backspace]' but 'read-key-sequence' is defined in C and I
> don't know how trigger it's translation logic programmatically from
> Elisp.

Perhaps Stefan (CC'ed) could help you.

Btw, this kind of questions should be posted to
help-gnu-emacs@gnu.org, not here.