Re: trouble binding to <next> & <prior>

["Lennart Borgman (gmail)" <lennart.borgman@gmail.com>]

Mirko wrote:
> On Jul 7, 4:04 pm, "Lennart Borgman (gmail)"
> <lennart.borg...@gmail.com> wrote:
>> Mirko wrote:
>>> On Jul 7, 2:09 pm, "Lennart Borgman (gmail)"
>>> <lennart.borg...@gmail.com> wrote:
>>>> Mirko wrote:
>>>>> On Jul 7, 12:59 pm, p...@informatimago.com (Pascal J. Bourguignon)
>>>>> wrote:
>>>>>> Mirko <mvuko...@nycap.rr.com> writes:
>>>>>>> Hello,
>>>>>>> I have a following keybinding, parts of which do not work.  In
>>>>>>> particular I am trying to bind view-previous-entry to the page-up key
>>>>>>> on the standard PC keyboard (using Emacs 22.1).  I used both h-k and h-
>>>>>>> l to determine that this key is identified with "<prior>" & <next>".
>>>>>>> (defvar iop-alert-mode-map nil
>>>>>>>   "Keymap for IOP-alert mode")
>>>>>>> (unless iop-alert-mode-map
>>>>>>>   (setq iop-alert-mode-map (copy-keymap text-mode-map))
>>>>>>>   (define-key iop-alert-mode-map (kbd "<prior>") 'view-previous-entry)
>>>>>>>   (define-key iop-alert-mode-map (kbd "<next>") 'view-next-entry)
>>>>>>>   (define-key iop-alert-mode-map (kbd "d") 'mark-entry-for-deletion)
>>>>>>>   (define-key iop-alert-mode-map "m" 'mark-entry-for-save))
>>>>>>> When in a buffer with iop-alert mode, doing h-m gives me the following
>>>>>>> output on keybindings:
>>>>>>> ... stuff skipped
>>>>>>> < n e           Prefix Command
>>>>>>> < p r           Prefix Command
>>>>>>> < n e x         Prefix Command
>>>>>>> < p r i         Prefix Command
>>>>>>> < n e x t       Prefix Command
>>>>>>> < p r i o       Prefix Command
>>>>>>> < n e x t >  view-next-entry
>>>>>>> < p r i o r     Prefix Command
>>>>>>> < p r i o r >        view-previous-entry
>>>>>>> It seems <prior> and <next> are bound to the character sequence
>>>>>>> "<prior>" and "<next>".  Pressing those characters will invoke the
>>>>>>> commands.  But pressing the Page-up/down keys will not.
>>>>>>> Indeed, doing a h-k shows that page-up/down are still bound to scroll
>>>>>>> up/down.
>>>>>>> What am I doing wrong?
>>>>>> emacs-version   --> "22.2.1"
>>>>>> (kbd "<prior>") --> [prior]
>>>>>> if you don't get this vector with one symbol for (kbd "<prior>"),
>>>>>> indeed you have a problem.
>>>>>> --
>>>>>> __Pascal Bourguignon__                    http://www.informatimago.com/
>>>>>> WARNING: This product warps space and time in its vicinity.
>>>>> I tried that, and I get exactly as you suggested.
>>>>> (kbd "<prior>") --> [prior]
>>>>> Mirko
>>>> It looks like you have been doing
>>>>   (define-key iop-alert-mode-map "<prior>" 'view-previous-entry)
>>>> instead of
>>>>   (define-key iop-alert-mode-map (kbd "<prior>") 'view-previous-entry)
>>> Nope.  This is what I have
>>>  (define-key iop-alert-mode-map (kbd "<prior>") 'view-previous-entry)
>>> Thanks,
>>> Mirko
>> Could you try to re-evaluate the code. Place point inside the defvar and
>> do C-M-x (this will just set iop-alert-mode-map to nil again). Then
>> place point inside the unless form and do C-M-x again.
>>
>> Does this correct the keymap?
> 
> Yes and no.
> 
> Following your instructions to the keystroke, I first set the map to
> nil, and then re-assigned it.  And now h-m gives a much saner
> response:
> <next>		view-next-entry
> <prior>		view-previous-entry

That is good.

Just a short note to avoid confusing other readers: I think you mean 
`C-h m' here when you write `h-m'. And below you probably mean `C-h k'.

> (In my defense, I did try restarting emacs and reloading the file,
> before starting this topic).

Did you happen to compile the file? The compiled file takes precedence 
over the uncompiled. This is confusing and I have fallen in that trap 
myself. (There is a warning in the *Message* buffer but that is a bit to 
shy in my opinion.)

> However, h-k on page up and page down still gives:
> <next> runs the command scroll-up
>   which is an interactive built-in function in `C source code'.
> It is bound to C-v, <next>.
> (scroll-up &optional arg)
> 
> ??

There are many keymaps involved. You can use `C-h b' to see all the key 
bindings.

There is rather much in the manual describing this, for example

   (info "(elisp) Searching the Active Keymaps")


> Thanks,
> 
> Mirko
>