Trying to global-set-key

Trying to global-set-key

[Harshdeep S Jawanda]

I want to global-set-key C-u 1 C-v (scroll-up) to C-down in my .emacs 
file. How do I do that?

As a starting point I tried: (global-set-key [C-down] 'scroll-up), but 
that doesn't seem to do even a simple scroll-up.  When I do C-h a for 
scroll-up, the keybinding shows up, but it doesn't seem to work.

Thanks.

-- 
Harshdeep

Re: Trying to global-set-key

[Kevin Rodgers]

Harshdeep S Jawanda wrote:

> I want to global-set-key C-u 1 C-v (scroll-up) to C-down in my .emacs 
> file. How do I do that?


You can't, exactly: that would mean that `C-u 1' is a prefix key, but `C-u'
is already bound to universal-argument (which is a binding you want to retain
-- trust me).  But if you mean that you want to be able to type C-down instead
of `C-u 1 C-v', then the simplest thing is to define a keyboard macro:

(global-set-key [C-down] (kbd "C-u 1 C-v"))


> As a starting point I tried: (global-set-key [C-down] 'scroll-up), but 
> that doesn't seem to do even a simple scroll-up.  When I do C-h a for 
> scroll-up, the keybinding shows up, but it doesn't seem to work.

That ought to work, but perhaps a local key binding is shadowing the global
binding.  What happens if you type `C-h k' followed by C-down?  What does
`C-h l' show immediately after that?

-- 
<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;">Kevin Rodgers</a>

Re: Trying to global-set-key

[Harshdeep S Jawanda]

If I write this as (global-set-key "\C-cd" '"\C-u1\C-v"), then it works. 
Why doesn't it work with the down arrow key?

Harshdeep S Jawanda wrote:

> I want to global-set-key C-u 1 C-v (scroll-up) to C-down in my .emacs 
> file. How do I do that?
>
> As a starting point I tried: (global-set-key [C-down] 'scroll-up), but 
> that doesn't seem to do even a simple scroll-up.  When I do C-h a for 
> scroll-up, the keybinding shows up, but it doesn't seem to work.
>
> Thanks. 

-- 
Harshdeep S Jawanda

Re: Trying to global-set-key

[Harshdeep S Jawanda]

Kevin Rodgers wrote:

> But if you mean that you want to be able to type C-down instead
> of `C-u 1 C-v',

Yes, that is exactly what I mean to say.

> then the simplest thing is to define a keyboard macro:
>
> (global-set-key [C-down] (kbd "C-u 1 C-v")) 

I tried this: doesn't work.  Basically, I think the problem is that 
Emacs is not recognizing the Ctrl key as a modifier when used with the 
down arrow key.

> That ought to work, but perhaps a local key binding is shadowing the 
> global
> binding.  What happens if you type `C-h k' followed by C-down?

It only says "<down> runs the command next-line". It doesn't recognize 
that the Ctrl key has also been pressed. When I write (global-set-key 
[next] '"\C-u1\C-v"), it works fine. I just need to tell Emacs to modify 
behavior only when Ctrl key is pressed.

> What does `C-h l' show immediately after that?

Well, if you really want to know:

C-x b RET ESC [ A ESC [ A ESC [ A ESC [ B ESC [ B ESC
[ B C-h k ESC [ B C-h l

I personally can't make head or tail of it :-).  Thanks for your help, 
though.  I have near-zero knowledge of elisp -- I am only trying out the 
things I can glean from the info files :-).

-- 
Harshdeep S Jawanda

Re: Trying to global-set-key

[Stefan Monnier]

>>>>> "Harshdeep" == Harshdeep S Jawanda <hjawanda@cs.unm.edu> writes:
> C-x b RET ESC [ A ESC [ A ESC [ A ESC [ B ESC [ B ESC
> [ B C-h k ESC [ B C-h l

Your terminal sends the same key sequence when you hit `C-down' as when you
hit `down', so Emacs just can't do what you want.
You'll first have to configure your terminal to send different key
sequences for those two cases.  As for how to do that, it completely
depends on the particular text terminal you're using (it might be
impossible without using another text-terminal).


        Stefan