bug#29036: 26.0.90; Feature Request: make "emacsclient +linenum file" rencenter line

bug#29036: 26.0.90; Feature Request: make "emacsclient +linenum file" rencenter line

[Xiaolong Zhang]

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Hi list,

I got no answer on stack-exchange for emacs (
https://emacs.stackexchange.com/questions/36434/make-emacs-recenter-the-line-for-latex-inverse-search)
so I'm asking here.


I'm using emacs for LaTeX file editing and emacsclient support the nice
command line option "+linenum file" to "visit file using find-file, then go
to line number linenum in it", which works well.

Is it possible to recenter to linenum at the sametime? This is the default
behavior for Notepad++ and I've tried the "--eval" option, but it won't
switch focus to  emacs automatically.

Thanks.

Best,
Xiaolong

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bug#29036: 26.0.90; Feature Request: make "emacsclient +linenum file" rencenter line

[Eli Zaretskii]

> From: Xiaolong Zhang <xlzhang921@gmail.com>
> Date: Sat, 28 Oct 2017 11:30:27 +0800
> 
> I'm using emacs for LaTeX file editing and emacsclient support the nice command line option "+linenum file"
> to "visit file using find-file, then go to line number linenum in it", which works well. 
> 
> Is it possible to recenter to linenum at the sametime? This is the default behavior for Notepad++ and I've tried
> the "--eval" option, but it won't switch focus to  emacs automatically.

Emacs recenters by default, so unless you have some customizations
which disable that as side effect, it should already do what you
want.  I just tried the command

  emacsclient +150 configure.ac

and got line 150 centered in the window where Emacs shows the file.
If that doesn't work for you, please show the exact recipe.  You seem
to invoke emacsclient from another program (I tried from the shell
prompt), so perhaps there's something in that context which affects
the issue; I'm not familiar with "SumatraPDF" and the "inverse search
feature".

Another possible reason for not recentering is that the file whose
name is passed to emacsclient is already visited in Emacs, and the
line whose number you pass to emacsclient is already visible in some
window, but not at the center of that window.  In that case, Emacs
will not recenter.

bug#29036: 26.0.90; Feature Request: make "emacsclient +linenum file" rencenter line

[Xiaolong Zhang]

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Hi Eli,

Thanks. You are right, vanilla ​Emacs indeed recenters a new file by
default.
I'm using spacemacs, which won't and I'm investigating the problem.


If the file is already visited in Emacs, it won't recenter. Is it possible
to make
Emacs recenter even if it's already visited? I've check with Notepad++,
which
will recenter even if it's already opened.

Best,
Xiaolong



On Sat, Oct 28, 2017 at 2:49 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Xiaolong Zhang <xlzhang921@gmail.com>
> > Date: Sat, 28 Oct 2017 11:30:27 +0800
> >
> > I'm using emacs for LaTeX file editing and emacsclient support the nice
> command line option "+linenum file"
> > to "visit file using find-file, then go to line number linenum in it",
> which works well.
> >
> > Is it possible to recenter to linenum at the sametime? This is the
> default behavior for Notepad++ and I've tried
> > the "--eval" option, but it won't switch focus to  emacs automatically.
>
> Emacs recenters by default, so unless you have some customizations
> which disable that as side effect, it should already do what you
> want.  I just tried the command
>
>   emacsclient +150 configure.ac
>
> and got line 150 centered in the window where Emacs shows the file.
> If that doesn't work for you, please show the exact recipe.  You seem
> to invoke emacsclient from another program (I tried from the shell
> prompt), so perhaps there's something in that context which affects
> the issue; I'm not familiar with "SumatraPDF" and the "inverse search
> feature".
>
> Another possible reason for not recentering is that the file whose
> name is passed to emacsclient is already visited in Emacs, and the
> line whose number you pass to emacsclient is already visible in some
> window, but not at the center of that window.  In that case, Emacs
> will not recenter.
>

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bug#29036: 26.0.90; Feature Request: make "emacsclient +linenum file" rencenter line

[Eli Zaretskii]

> From: Xiaolong Zhang <xlzhang921@gmail.com>
> Date: Sun, 29 Oct 2017 18:57:36 +0800
> Cc: 29036@debbugs.gnu.org
> 
> If the file is already visited in Emacs, it won't recenter. Is it possible to make
> Emacs recenter even if it's already visited?

You can only do that by customizing the scrolling behavior in
general.  There's no special behavior for visiting a file that is
already in Emacs.

bug#29036: 26.0.90; Feature Request: make "emacsclient +linenum file" rencenter line

[Xiaolong Zhang]

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Got it. Thanks.

On Sun, Oct 29, 2017 at 7:18 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Xiaolong Zhang <xlzhang921@gmail.com>
> > Date: Sun, 29 Oct 2017 18:57:36 +0800
> > Cc: 29036@debbugs.gnu.org
> >
> > If the file is already visited in Emacs, it won't recenter. Is it
> possible to make
> > Emacs recenter even if it's already visited?
>
> You can only do that by customizing the scrolling behavior in
> general.  There's no special behavior for visiting a file that is
> already in Emacs.
>

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bug#29036: 26.0.90; Feature Request: make "emacsclient +linenum file" rencenter line

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Xiaolong Zhang <xlzhang921@gmail.com>
>> Date: Sun, 29 Oct 2017 18:57:36 +0800
>> Cc: 29036@debbugs.gnu.org
>>
>> If the file is already visited in Emacs, it won't recenter. Is it possible to make
>> Emacs recenter even if it's already visited?
>
> You can only do that by customizing the scrolling behavior in
> general.  There's no special behavior for visiting a file that is
> already in Emacs.

It seems like the reporter got the needed answer.  I'm therefore closing
this bug report.

Best regards,
Stefan Kangas