Keeping the point at the same position in multiple buffers

Keeping the point at the same position in multiple buffers

[Corey Foote]

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Hi everybody,

When editing several files in Emacs, each in its own buffer, each buffer has its own point location. I have Emacs displaying two buffers, each in it's own window. I was wondering if there's an easy way to make it so that each of these buffers will keep the point at the same place in both buffers (or at least on the same line) even though this is not the default behavior.

So, for example, when I press C-n in the current buffer, the other buffer will also move it's point to the next line.

Any suggestions?

Thanks!

Corey Foote

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Re: Keeping the point at the same position in multiple buffers

[Alex Bennee]

On Thu, 2008-08-21 at 10:39 -0400, Corey Foote wrote:
> Hi everybody,
> 
> When editing several files in Emacs, each in its own buffer, each
> buffer has its own point location. I have Emacs displaying two
> buffers, each in it's own window. I was wondering if there's an easy
> way to make it so that each of these buffers will keep the point at
> the same place in both buffers (or at least on the same line) even
> though this is not the default behavior.
> 
> So, for example, when I press C-n in the current buffer, the other
> buffer will also move it's point to the next line.

ediff-mode does roughly that when comparing 2 or 3 files. However I
suspect that's not quite what you want.

> 
> Any suggestions?
> 
> Thanks!
> 
> Corey Foote
> 
> 
> ______________________________________________________________________
> See what people are saying about Windows Live. Check out featured
> posts. Check It Out!
-- 
Alex Bennee, Software Engineer
[End of diatribe. We now return you to your regularly scheduled
programming...] -- Larry Wall in Configure from the perl distribution

Re: Keeping the point at the same position in multiple buffers

[Xah]

On Aug 21, 7:39 am, Corey Foote <coreyfo...@hotmail.com> wrote:
> Hi everybody,
>
> When editing several files in Emacs, each in its own buffer, each buffer has its own point location. I have Emacs displaying two buffers, each in it's own window. I was wondering if there's an easy way to make it so that each of these buffers will keep the point at the same place in both buffers (or at least on the same line) even though this is not the default behavior.
>
> So, for example, when I press C-n in the current buffer, the other buffer will also move it's point to the next line.

You can try “Alt+x 2C-two-columns” (shortuct Ctrl+x 6 2). This split a
window into 2 vertical columns. Page up/down one will also page up/
down the other. However, cursor doesn't follow.

related is a Alt+x follow-mode, which is for viewing one long file in
2 verticle frames as if you have a long monitor.

i'm pretty sure what you want is already implemented somewhere.

  Xah
∑ http://xahlee.org/

☄

Re: Keeping the point at the same position in multiple buffers

[Andreas Politz]

Xah wrote:
> On Aug 21, 7:39 am, Corey Foote <coreyfo...@hotmail.com> wrote:
>> Hi everybody,
>>
>> When editing several files in Emacs, each in its own buffer, each buffer has its own point location. I have Emacs displaying two buffers, each in it's own window. I was wondering if there's an easy way to make it so that each of these buffers will keep the point at the same place in both buffers (or at least on the same line) even though this is not the default behavior.
>>
>> So, for example, when I press C-n in the current buffer, the other buffer will also move it's point to the next line.
> 
> You can try “Alt+x 2C-two-columns” (shortuct Ctrl+x 6 2). This split a
> window into 2 vertical columns. Page up/down one will also page up/
> down the other. However, cursor doesn't follow.
> 
> related is a Alt+x follow-mode, which is for viewing one long file in
> 2 verticle frames as if you have a long monitor.
> 
> i'm pretty sure what you want is already implemented somewhere.
> 
>   Xah
> ∑ http://xahlee.org/
> 
> ☄

Here it is :

---
scroll-all-mode is an interactive compiled Lisp function in `scroll-all.el'.
(scroll-all-mode &optional arg)

Toggle Scroll-All minor mode.
With arg, turn Scroll-All minor mode on if arg is positive, off otherwise.
When Scroll-All mode is on, scrolling commands entered in one window
apply to all visible windows in the same frame.
---

Looking at the code it should be easy to extend this to other commands
(like forward-char).


-ap

Re: Keeping the point at the same position in multiple buffers

[martin rudalics]

 > When editing several files in Emacs, each in its own buffer, each buffer
 > has its own point location. I have Emacs displaying two buffers, each in
 > it's own window. I was wondering if there's an easy way to make it so
 > that each of these buffers will keep the point at the same place in both
 > buffers (or at least on the same line) even though this is not the
 > default behavior.

You can try to add the untested snippet below to your .emacs.

martin


(defun synchronize-windows ()
   (save-selected-window
     (condition-case nil
	(let ((pos (window-point))
	      (sel (selected-window))
	      (buf (window-buffer (selected-window))))
	  (dolist (frame (frame-list))
	    (dolist (window (window-list frame))
	      (when (and (eq (window-buffer window) buf)
			 (not (eq window sel))
			 (/= (window-point window) pos))
		(set-window-point window pos)))))
       (error nil))))

(add-hook 'post-command-hook 'synchronize-windows t)