Forcing emacs to refresh the display

Forcing emacs to refresh the display

[brian greenfield]

This isn't a Perl question, honest :)

I'm trying to automatically switch line numbers on (using linum-mode)
before invoking the perl debugger. linum-mode is activated, but the
line numbers don't display until I switch back to the original window.

The first thing that perldb does is to prompt the user for the command
line. ie, (read-from-minibuffer) or similar. At this point the perl
buffer doesn't have line numbers visible unless I C-x O into that buffer.

If I don't switch windows at this point, and let the debugger start,
it's prompt for a dubugging command and still the line numbers don't show
until I switch to the other buffer.

You can see the effect with this trimmed down code that doesn't
involve perl at all:

  (defun mydb ()
    "Saves buffer, deletes other window, turns on linum-mode and runs cperl-db"
    (interactive)
      (linum-mode)
      ;(force-window-update)
      ;(redraw-display)
      ;(setq redisplay-dont-pause t)
      ;(redisplay t)
      ;(sit-for 1)

      ;at this point I'd like line numbers visible, but they only appear
      ;if I switch windows and back again

      (read-from-minibuffer "press enter ") )

The commented-out functions are what I've tried to force the window
to update.

How can I force emacs (I've tried with 21.4.1, 22.2.1 and 23.0.60.1)
to refresh the display?

Re: Forcing emacs to refresh the display

[Juanma Barranquero]

On Thu, Aug 7, 2008 at 19:02, brian greenfield <bri@zombie.org.uk> wrote:

> If I don't switch windows at this point, and let the debugger start,
> it's prompt for a dubugging command and still the line numbers don't show
> until I switch to the other buffer.
>
> You can see the effect with this trimmed down code that doesn't
> involve perl at all:
>
>  (defun mydb ()
>    "Saves buffer, deletes other window, turns on linum-mode and runs cperl-db"
>    (interactive)
>      (linum-mode)
>      ;(force-window-update)
>      ;(redraw-display)
>      ;(setq redisplay-dont-pause t)
>      ;(redisplay t)
>      ;(sit-for 1)
>
>      ;at this point I'd like line numbers visible, but they only appear
>      ;if I switch windows and back again
>
>      (read-from-minibuffer "press enter ") )

You talk about switching windows, but your example function does not
create any new window. Certainly running M-x mydb <RET> shows the line
numbers...

  Juanma

Re: Forcing emacs to refresh the display

[Markus Triska]

brian greenfield <bri@zombie.org.uk> writes:

> I'm trying to automatically switch line numbers on (using linum-mode)
> before invoking the perl debugger. linum-mode is activated, but the
> line numbers don't display until I switch back to the original window.

I could not reproduce your problem with the current CVS version of
Emacs; are you using the latest version of linum.el?

Re: Forcing emacs to refresh the display

[brian greenfield]

On Fri, Aug 08, 2008 at 10:46:49AM +0200, Juanma Barranquero wrote:
> On Thu, Aug 7, 2008 at 19:02, brian greenfield <bri@zombie.org.uk> wrote:
> 
> > If I don't switch windows at this point, and let the debugger start,
> > it's prompt for a dubugging command and still the line numbers don't show
> > until I switch to the other buffer.
> >
> > You can see the effect with this trimmed down code that doesn't
> > involve perl at all:
> >
> >  (defun mydb ()
> >    "Saves buffer, deletes other window, turns on linum-mode and runs cperl-db"
> >    (interactive)
> >      (linum-mode)
> >      ;(force-window-update)
> >      ;(redraw-display)
> >      ;(setq redisplay-dont-pause t)
> >      ;(redisplay t)
> >      ;(sit-for 1)
> >
> >      ;at this point I'd like line numbers visible, but they only appear
> >      ;if I switch windows and back again
> >
> >      (read-from-minibuffer "press enter ") )
> 
> You talk about switching windows, but your example function does not
> create any new window. Certainly running M-x mydb <RET> shows the line
> numbers...

After M-x mydb RET, the cursor is in the minibuffer and the main
window doesn't have line numbers. C-x o makes the main window active
and the line numbers appear, another C-x o moves the cursor back to
the minibuffer ready to answer the prompt.

I'd like the line numbers to appear without having to leave the
minibuffer.

Re: Forcing emacs to refresh the display

[Juanma Barranquero]

On Fri, Aug 8, 2008 at 11:04, brian greenfield <bri@zombie.org.uk> wrote:

> After M-x mydb RET, the cursor is in the minibuffer and the main
> window doesn't have line numbers. C-x o makes the main window active
> and the line numbers appear, another C-x o moves the cursor back to
> the minibuffer ready to answer the prompt.

That's not what I see.

emacs -Q
C-y             ; to paste your function
C-x C-e         ; to define mydb
M-x mydb <RET>  ; the minibuffer shows "pres enter " and the *scratch*
buffer shows line numbers.

What version of Emacs are you using?

  Juanma

Re: Forcing emacs to refresh the display

[brian greenfield]

On Fri, Aug 08, 2008 at 11:09:30AM +0200, Juanma Barranquero wrote:
> That's not what I see.
> 
> emacs -Q
> C-y             ; to paste your function
> C-x C-e         ; to define mydb
> M-x mydb <RET>  ; the minibuffer shows "pres enter " and the *scratch*
> buffer shows line numbers.
> 
> What version of Emacs are you using?

21.4.1, 22.2.1 and 23.0.60.1 and linum.el version 0.9.

Using linum.el as supplied with emacs23 (0.9wx) everything works as it
should! So, problem solved.

Thanks for your time Juanma

Re: Forcing emacs to refresh the display

[brian greenfield]

On Fri, Aug 08, 2008 at 10:48:43AM +0200, Markus Triska wrote:
> I could not reproduce your problem with the current CVS version of
> Emacs; are you using the latest version of linum.el?

No, I wasn't. I was using 0.9. :(

Using linum.el as supplied with emacs23 (0.9wx) everything works as it
should!