A scrolling wish..

A scrolling wish..

[D. Goel]

If I programatically call (scroll-up 2), there seems to be no way to
tell what the result of the operation was.  viz. whether we reached a
max-scrolled-out [not same as eobp] condition, or whether the output
succeeded.  (scroll-up) always returns nil.  

Perhaps it could return something more useful?


The only other option looks like (window-vscroll), but is it buggy
right now? --->

I try an emacs -q -no-site-file, go to *scratch*, insert many
screenfuls of lines, then at various positions, insert this and eval --->
I have tried (window-vscroll) as well as: 
	(window-vscroll (get-buffer-window (buffer-name))), 

at many different scroll positions, but i always get 0, both with the
cvs as well as 21.2.




DG                                 http://24.197.159.102/~deego/
--

Re: A scrolling wish..

[D. Goel]

Please ignore my post[1].  I am sorry for that. 



[1] in case you don't already ignore them :-)

Re: A scrolling wish..

[Richard Stallman]

    If I programatically call (scroll-up 2), there seems to be no way to
    tell what the result of the operation was.  viz. whether we reached a
    max-scrolled-out [not same as eobp] condition, or whether the output
    succeeded.  (scroll-up) always returns nil.  

    Perhaps it could return something more useful?

Do you want to implement it and debug it?

Re: A scrolling wish..

[D. Goel]

> Do you want to implement it and debug it?


I shall try to.  (scroll-up) and (scroll-down) already do throw errors
if they reach a bobp or eobp condition.  I could perhaps try to also
make the regular case return something useful, like the amount of
(window-vscroll).

More importantly, i would like to fix/see-getting-fixed the bug in
(window-vscroll), and will work on it.  It always returns 0 for me
(with one excetion, which is not worth going into)---in short, the
"answer" it returns seems clearly wrong.  Am I misinterpreting the
function?  Or could someone please confirm the bug?