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Re: Buffer specific binding


From: Tassilo Horn
Subject: Re: Buffer specific binding
Date: Wed, 26 Aug 2015 09:44:45 +0200
User-agent: Gnus/5.130014 (Ma Gnus v0.14) Emacs/25.0.50 (gnu/linux)

Ian Zimmerman <address@hidden> writes:

> What's the best way to bind a key to a command _only in a specific
> buffer_?  AFAIK local-set-key will set it in the mode keymap so all
> buffers in the same mode will see the change or addition; I'd like to
> avoid that.
>
> I know one answer: make a specialized mode (inherited from the real
> one).  Any other way?

I guess you could define a new keymap with the new bindings which has
the current local map as parent, and then use you new keymap as local
map.

  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map (current-local-map))
    (define-key map (kbd "C-c c")
                (lambda ()
                  (interactive)
                  (message "Hey there!")))
    (use-local-map map))

I guess you can easily wrap that into some function
`iz/define-buffer-local-keys' and then call that conveniently from a
file local variable section:

;; Local Variables:
;; eval: (iz/define-buffer-local-keys
;;         (kbd "C-c c") #'iz/do-this
;;         (kbd "C-c C") #'iz/do-that)
;; End:


HTH,
Tassilo



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