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RE: fail to call edebug-defun
From: |
Drew Adams |
Subject: |
RE: fail to call edebug-defun |
Date: |
Sun, 14 Jul 2013 06:43:55 -0700 (PDT) |
> byte-code: Key sequence C-x C-a C-s starts with non-prefix key C-x C-a
This message means that `C-x C-a' has not yet been defined as a prefix key.
Imagine that you wanted to set `C-x C-a C-s' in the global keymap to command
`forward-char'. If you try `M-x global-set-key RET C-x C-a C-s' you never
get a chance to hit `C-s'. Emacs interrupts after `C-x C-a', thinking that
you want to bind the key `C-x C-a'. Emacs doesn't know that you want that
to be a prefix key. (Emacs does know, out of the box, that `C-x' is a
prefix key - it is predefined as such.)
Do this first:
(define-key your-keymap (kbd "C-x C-a") nil)
That still does not tell Emacs that `C-x C-a' is to be a prefix key, but
it does liberate it to become one. It tells Emacs that `C-x C-a' has no
key binding.
Now you can bind `C-x C-a C-s':
(define-key your-keymap (kbd "C-x C-a C-s") 'your-command)
Now Emacs knows that `C-x C-a' is a prefix key in `your-keymap'. If you
used `global-set-key' above, instead of `define-key' with `your-keymap',
then after the `C-x C-a C-s' definition you would be able to do
`M-x global-set-key RET C-x C-a C-s' and Emacs would not interrupt after
`C-x C-a'. Instead, it would wait, expecting another key to follow.
Someone else will be able to answer your question about edebug. I use
ordinary `debug', myself. (E.g., `debug-on-entry',
`toggle-debug-on-error', or explicit `(debug)' calls in the code.)
See also (elisp) `Prefix Keys'.