bug#20236: 25.0.50; Feature Request: scroll-other-window does not allow setting of scroll function

bug#20236: 25.0.50; Feature Request: scroll-other-window does not allow setting of scroll function

[Tory S. Anderson]

the c-code scroll-other-window functions do not allow specification of the function to be used for scrolling, which means they have problems with other-window modes like Info and PDF-View. It would be tremendously useful if support for dynamic setting of the scroll-other-window functions would be allowed (based on the mode of other-window). 



In GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.9)
 of 2015-03-23 on localhost.localdomain
Repository revision: ad80180d0f2fc2ea422cf7ca5bdcc636c0600744
Windowing system distributor `Fedora Project', version 11.0.11404000
System Description:	Fedora release 20 (Heisenbug)

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/home/torys/.emacs.d/elpa/org-20150323/org-irc hides /home/torys/workspace/emacs/lisp/org/org-irc
/home/torys/.emacs.d/elpa/org-20150323/org-id hides /home/torys/workspace/emacs/lisp/org/org-id
/home/torys/.emacs.d/elpa/org-20150323/org-protocol hides /home/torys/workspace/emacs/lisp/org/org-protocol
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bug#20236: 25.0.50; Feature Request: scroll-other-window does not allow setting of scroll function

[Stefan Monnier]

severity 20236 wishlist
thanks

> the c-code scroll-other-window functions do not allow specification of
> the function to be used for scrolling, which means they have problems
> with other-window modes like Info and PDF-View.  It would be
> tremendously useful if support for dynamic setting of the
> scroll-other-window functions would be allowed (based on the mode of
> other-window). 

Agreed.  Patch welcome.


        Stefan

bug#20236: 25.0.50; Feature Request: scroll-other-window does not allow setting of scroll function

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> the c-code scroll-other-window functions do not allow specification of
>> the function to be used for scrolling, which means they have problems
>> with other-window modes like Info and PDF-View.  It would be
>> tremendously useful if support for dynamic setting of the
>> scroll-other-window functions would be allowed (based on the mode of
>> other-window). 
>
> Agreed.  Patch welcome.

Hm...  I don't think modes explicitly define a scrolling command -- they
just rebind <next> etc?

So for this to work, we'd have to introduce a scroll-command variable
that buffers could set locally, and then have scroll_command call that
instead of doing its thing if it's set?

Anybody have an opinion here?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#20236: 25.0.50; Feature Request: scroll-other-window does not allow setting of scroll function

[Juri Linkov]

>>> the c-code scroll-other-window functions do not allow specification of
>>> the function to be used for scrolling, which means they have problems
>>> with other-window modes like Info and PDF-View.  It would be
>>> tremendously useful if support for dynamic setting of the
>>> scroll-other-window functions would be allowed (based on the mode of
>>> other-window).
>>
>> Agreed.  Patch welcome.
>
> Hm...  I don't think modes explicitly define a scrolling command -- they
> just rebind <next> etc?
>
> So for this to work, we'd have to introduce a scroll-command variable
> that buffers could set locally, and then have scroll_command call that
> instead of doing its thing if it's set?
>
> Anybody have an opinion here?

Looks like this could be useful in e.g. `follow-mode'.
`follow-mode-map' binds only these keys:

    (define-key map "\C-v"	#'follow-scroll-up)
    (define-key map "\M-v"	#'follow-scroll-down)

So users of follow-mode need to add more customization:

  (with-eval-after-load 'follow
    (define-key follow-mode-map [prior] 'follow-scroll-down)
    (define-key follow-mode-map [next]  'follow-scroll-up))

that still doesn't work in view-mode where
the scrolling key SPC is bound to View-scroll-page-forward.

Oh, wait a sec.  Maybe remapping is sufficient.

And indeed, everything is achievable with just:

  (with-eval-after-load 'follow
    (define-key follow-mode-map [remap scroll-up-command] #'follow-scroll-up)
    (define-key follow-mode-map [remap scroll-down-command] #'follow-scroll-down)
    (define-key follow-mode-map [remap View-scroll-page-forward] #'follow-scroll-up)
    (define-key follow-mode-map [remap View-scroll-page-forward-set-page-size] #'follow-scroll-up)
    (define-key follow-mode-map [remap View-scroll-page-backward] #'follow-scroll-down))

bug#20236: 25.0.50; Feature Request: scroll-other-window does not allow setting of scroll function

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

> Oh, wait a sec.  Maybe remapping is sufficient.
>
> And indeed, everything is achievable with just:
>
>   (with-eval-after-load 'follow
>     (define-key follow-mode-map [remap scroll-up-command] #'follow-scroll-up)
>     (define-key follow-mode-map [remap scroll-down-command] #'follow-scroll-down)

Hm...  perhaps scroll-other-window could look into that other window and
see whether scroll-{up,down}-command is remapped there, and then use
that function?  Then we wouldn't have to introduce anything new, really.
(But just fix the keymaps in affected modes.)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#20236: 25.0.50; Feature Request: scroll-other-window does not allow setting of scroll function

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Hm...  perhaps scroll-other-window could look into that other window and
> see whether scroll-{up,down}-command is remapped there, and then use
> that function?  Then we wouldn't have to introduce anything new, really.

I've now done this, sort of -- I moved the functions from C to Lisp, and
made them check remapping.  But if there aren't any remappings, they
call scroll-up-command instead of scroll-up, which means that other user
options in this area are also heeded.

(I first wondered whether it might make sense to introduce new
scroll-other-window-command indirections here, but that only complicates
things, especially since so many packages remap scroll-other-window.)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#20236: add tiny-change equivalent to 62e7506

[Paul Eggert]

I fixed this as follows (and anyone can use this as a recipe for this sort of 
thing next time):

git checkout master
make change-history
[Edit ChangeLog.2 by hand.]
[Commit the ChangeLog.2 edit.]

bug#20236: 25.0.50; Feature Request: scroll-other-window does not allow setting of scroll function

[Paul Eggert]

Please ignore my previous email to Bug#20236:

http://bugs.gnu.org/20236#13

It was a typo, intended for Bug#20326.  Sorry about the noise.