Emacs Keys: Keybinding Functions (emacs 29 and emacs 28)

Emacs 29 keybinding function change

Emacs 29 (date 2023) added many new function for keybinding.

The old functions are still supported.

Their syntax is pretty much the same.

;; example

;; emacs 29 syntax
(keymap-global-set "C-t" #'whitespace-mode)

;; emacs 28 or before
(global-set-key (kbd "C-t") #'whitespace-mode)

Other Keybinding Functions Change

• *** where-is-internal can now filter events marked as non key events. If a command maps to a key binding like '[some-event]', and some-event has a symbol plist containing a non-nil non-key-event property, then that binding is ignored by where-is-internal.
• *** New functions for defining and manipulating keystrokes. These all take the syntax defined by key-valid-p, which is basically the same syntax as the one accepted by the 'kbd' macro. None of the older functions have been deprecated or altered, but they are now de-emphasized in the documentation, and we encourage Lisp programs to switch to these new functions.
• *** define-key now takes an optional REMOVE argument. If non-nil, remove the definition from the keymap. This is subtly different from setting a definition to nil: when the keymap has a parent such a definition will shadow the parent's definition.