width of line numbers

width of line numbers

[Joost Kremers]

Hi all,

I was wondering if there's a way to find out the width of the current line
number display (with `display-line-number-mode`, not `linum-mode`).

Or, alternatively, get the window width without the line number. Both
`window-body-width` and `window-total-width` (why are there two functions, BTW?)
report the width of the text area without "dividers, scrollbars, margins,
fringes", but the line number display is still included.

TIA


-- 
Joost Kremers
Life has its moments

Re: width of line numbers

[Emanuel Berg via Users list for the GNU Emacs text editor]

Joost Kremers wrote:

> I was wondering if there's a way to find out the width of
> the current line number display (with
> `display-line-number-mode`, not `linum-mode`).

A hard to spot typo, should be `display-line-numbers-mode'.

> Or, alternatively, get the window width without the
> line number.

(defun display-width ()
  (interactive)
  (message "%s" (- (window-width) (line-number-display-width))) )

> `window-body-width` and `window-total-width` (why are there
> two functions, BTW?)

Two functions? What about `window-width'? :P

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal

Re: width of line numbers

[Joost Kremers]

On Tue, Dec 22 2020, Emanuel Berg via Users list for the GNU Emacs text editor wrote:
>> `window-body-width` and `window-total-width` (why are there
>> two functions, BTW?)
>
> Two functions? What about `window-width'? :P

Well, at least `window-width` is just an alias for `window-body-width`. The
other two are separate functions.

-- 
Joost Kremers
Life has its moments

Re: width of line numbers

[Stephen Berman]

On Tue, 22 Dec 2020 10:23:26 +0100 Joost Kremers <joostkremers@fastmail.fm> wrote:

> Hi all,
>
> I was wondering if there's a way to find out the width of the current line
> number display (with `display-line-number-mode`, not `linum-mode`).

(line-number-display-width)

> Or, alternatively, get the window width without the line number.

This should do it:

(- (window-body-width) (line-number-display-width))

>                                                                  
>                                                                  Both
> `window-body-width` and `window-total-width` (why are there two functions, BTW?)
> report the width of the text area without "dividers, scrollbars, margins,
> fringes", but the line number display is still included.

Actually, window-total-width "includes the widths of WINDOW’s fringes,
margins, scroll bars and its right divider, if any."

Steve Berman

Re: width of line numbers

[Joost Kremers]

On Tue, Dec 22 2020, Stephen Berman wrote:
> On Tue, 22 Dec 2020 10:23:26 +0100 Joost Kremers <joostkremers@fastmail.fm> wrote:
>
>> Hi all,
>>
>> I was wondering if there's a way to find out the width of the current line
>> number display (with `display-line-number-mode`, not `linum-mode`).
>
> (line-number-display-width)

Oh boy, this topic was covered extensively a while ago... I searched for
functions starting with `display-line-numbers`...

Thanks!

-- 
Joost Kremers
Life has its moments

Re: width of line numbers

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Tue, 22 Dec 2020 11:12:14 +0100
> Cc: gnu-emacs-help@gnu.org
> 
> This should do it:
> 
> (- (window-body-width) (line-number-display-width))

I suggest

  (- (window-body-width) (line-number-display-width 'columns))
                                                    ^^^^^^^^
to make sure you don't subtract apples from oranges...