Re: define-key upon common-lisp-mode and inferior-lisp-mode

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 30 Aug 2022 12:26:42 +0000
> From: uzibalqa <uzibalqa@proton.me>
> Cc: help-gnu-emacs@gnu.org
> 
> > > Thusly (define-key common-lisp-mode-map KEY DEF) fails
> > 
> > 
> > Its doc string says:
> > 
> > In addition to any hooks its parent mode ‘lisp-data-mode’ might have
> > run, this mode runs the hook ‘lisp-mode-hook’, as the final or
> > penultimate step during initialization.
> > 
> > So this mode inherits the keymap from its parent, lisp-data-mode.
> > 
> > As for binding keys, it is better to use local-define-key, I think.
> > It will figure out the keymap for you.
> 
> Like below?
> 
> (local-define-key common-lisp-mode-map (kbd "H-e") #'eval-last-sexp)

Yes.

> A bit non-standard compared to other modes.

AFAIU, you are a user, not a programmer who defines a new mode.  the
above is the standard way for users to define key bindings for the
current mode.