Re: Physical keyboard events

[Dov Grobgeld <dov.grobgeld@gmail.com>]

Switching to a different keyboard language causes all navigation
keyboard shortcuts to fail by default. This is why I found myself
adding the following to my .emacs file. I agree it would be nice if
there was some automatic way of creating this mapping, but using
keycodes, does not seem to be a correct way to do it.

;; some motion bindings in Hebrew mode that reflect key
;; positions for Dvorak.
(global-set-key [(control ?ש)] 'move-beginning-of-line)
(global-set-key [(control ?ג)] 'move-end-of-line)
(global-set-key [(control ?ר)] 'previous-line)
(global-set-key [(control ?ך)] 'next-line)
(global-set-key [(control ?ה)] 'kill-line)
(global-set-key [(control ?ף)] 'isearch-forward)
(global-set-key [(control ?ם)] 'isearch-backward)
(global-set-key [(control ?ץ)] 'scroll-up-command)
(global-set-key [(meta ?ץ)] 'scroll-down-command)
(global-set-key [(meta ?ט)] 'forward-word)
(global-set-key [(control ?ט)] 'forward-char)
(global-set-key [(meta ?מ)] 'backward-word)
(global-set-key [(control ?מ)] 'backward-char)
(define-key isearch-mode-map [(control ?ף)] 'isearch-repeat-forward)
(define-key isearch-mode-map [(control ?ם)] 'isearch-repeat-backward)
(global-set-key [(control ?נ) (control ?ף)] 'save-buffer)

On Wed, Oct 30, 2024 at 7:38 PM Eli Zaretskii <eliz@gnu.org> wrote:
>
> > From: Yuri Khan <yuri.v.khan@gmail.com>
> > Date: Thu, 31 Oct 2024 00:13:31 +0700
> > Cc: manikulin@gmail.com, emacs-devel@gnu.org
> >
> > On Wed, 30 Oct 2024 at 22:27, Eli Zaretskii <eliz@gnu.org> wrote:
> >
> > > > From: Yuri Khan <yuri.v.khan@gmail.com>
> > > > Date: Wed, 30 Oct 2024 13:28:20 +0700
> > > > Cc: emacs-devel@gnu.org
> >
> > > > I’m going to posit the hypothesis that the *only* command for which it
> > > > makes sense to use the keysym of the current layout is
> > > > ‘self-insert-command’.
> > > >
> > > > Everything else wants the keysym of “the” Latin-based layout if there
> > > > is one and only one; the keycode if there is none; and some heuristic
> > > > tiebreaker for the case where the user has more than one Latin-based
> > > > layout configured.
> > >
> > > How do you suggest to arrange for a low-level keyboard interface to
> > > know which kind of Emacs command attempted to read the keyboard?
> >
> > Since it’s not clairvoyant, it would need to save enough information
> > for the keymap lookup code downstream. Specifically (XKB/X11 case):
> > state of modifiers, keycode, keysym according to the currently active
> > group, and keysym according to the appropriate Latin-based group.
> >
> > Then, at the time of keymap lookup:
> >
> > * Look up the active modifiers + active group keysym.
> >   * If this yields ‘self-insert-command’ or another command
> > specifically whitelisted, return that.
> > * Look up the active modifiers + keysym from the Latin-based group. Return that.
>
> How do you know which keymap to look up and for which character,
> before you decide which character to produce?
>
> > Test case: If a mode keymap binds both ‘/’ and ‘.’, and a key produces
> > ‘/’ in the Latin layout and ‘.’ in Cyrillic layout, then the ‘/’
> > command shall be executed regardless of whether Latin or Cyrillic
> > layout is active.
>
> What if '/' is bound to self-insert-command, but '.' to something
> else: what do you return then?
>