Re: 'ignore hides \r in keymap

[Johan Bockgård]

Lennart Borgman <address@hidden> writes:

> This is one of those strange errors I wish I did not see. It seems like 
> 'ignore somehow hides \r in a keymap. To show this start with "emacs -Q" 
> and evaluate the following:
>
>  ;; Set up
>  (defconst km (make-sparse-keymap))
>  (define-key km "\r"   (lambda()(interactive)(message "hit RET")))
>
>  ;; Convinience switching to/from km
>  (define-key km [(home)] (lambda()(interactive)(use-local-map nil)))
>  (global-set-key [(control meta home)] 
> (lambda()(interactive)(use-local-map km)))
>
>  ;; Test using either of these and then hit RET
>  (define-key km [?i] (lambda()(interactive)(define-key km '[t] 'ignore)))
>  (define-key km [?n] (lambda()(interactive)(define-key km '[t] nil)))
>
> Activate the km keymap with C-M-home. Switch between using 'ignore or 
> nil for unbound keys in km by hitting i and n. I see the following:
>
> - Using nil and hitting RET gives the message "hit RET"
> - Using 'ignore and hitting RET gives nothing.
>
> I am doing this with CVS Emacs from 2005-10-27 on w32.

Looks like it's a problem of RET (C-m) vs <return> (function key). You
would see the same thing if you bound TAB (C-i) and pressed <tab> etc.

Apparently the default binding is used before the <return> --> RET
translation is made.

In other words, after you press "i":

(key-binding [return] t) => ignore
(key-binding "\C-m" t)   => (lambda nil (interactive) (message "hit RET"))

-- 
Johan Bockgård