Re: Function for deleting a key binding in a sparse keymap

[Lennart Borgman <lennart.borgman.073@student.lu.se>]

Kim F. Storm wrote:

>LENNART BORGMAN <lennart.borgman.073@student.lu.se> writes:
>
>  
>
>>>Why do you use emulation-mode-map-alist ?
>>>      
>>>
>>Because in this case it is a temporary minor mode that exists just
>>during a few keystrokes. I actually put the keymap first in
>>emulation-mode-map-alists to avoid any problem. Nearly all keys
>>except those for using the mode are bound to a function that exits
>>the temporary mode.
>>    
>>
>
>That is NOT the purpose of emulation-mode-map-alists, and there must
>be other ways to accomplish what you want to do.  E.g. (not tested):
>
>  (let (done)
>   (while (not done)
>     (let* ((ev (read-event))
>            (cmd (lookup-key your-keymap ev)))
>       (if cmd
>           (call-interactively cmd)  ; or just funcall
>         (setq done t)
>	 (clear-this-command-keys t)
>         (setq unread-command-events (cons ev unread-command-events)))))
>
It seems more complicated to me, but I might be wrong just because I did 
not think of doing it this way.

I am temporary using the emulation-mode-map-alists just for the purpose 
of putting my keymap first among the keymaps. This was not the reason 
for which emulation-mode-map-alist was invented, but it works for this 
purpose too I believe. I restore emulation-mode-map-alists when the 
temporary mode is exited.

The temporary mode is a mode for resizing windows interactively (see 
http://ourcomments.org/Emacs/DL/elisp/bw-interactive.el). The user will 
do a few keystroke in this mode and then exit it. No keyboard commands 
except those for the mode are allowed. In post-command-hook I also do 
some checks to see if I should exit the temporary mode. (Maybe I should 
do more.)

I am trying to understand what you are saying. Can you please explain 
what problems you see with what I am doing? I do not think that what I 
am doing here can possibly disturb the normal use of 
emulation-mode-map-alists, or can it? If it was not just before the 
release I might propose a new variable holding a temporary keymap like 
in my case, but this is not the time for it. Maybe what I am doing is 
unnecessary complicated?