Display line number on each buffer line

Display line number on each buffer line

[fatiparty--- via Users list for the GNU Emacs text editor]

Is there a way to display the line number on each buffer line?

Re: Display line number on each buffer line

[Lars Ingebrigtsen]

fatiparty--- via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> Is there a way to display the line number on each buffer line?

`M-x display-line-numbers-mode'

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

Display line number on each buffer line

[fatiparty--- via Users list for the GNU Emacs text editor]

Dec 2, 2021, 08:31 by larsi@gnus.org:

> fatiparty--- via Users list for the GNU Emacs text editor
> <help-gnu-emacs@gnu.org> writes:
>
>> Is there a way to display the line number on each buffer line?
>>
>
> `M-x display-line-numbers-mode'
>
That's what I was looking for.  Is there a technique for changing the foreground colour of the line number as well?

Re: Display line number on each buffer line

[Philip Kaludercic]

fatiparty--- via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> Dec 2, 2021, 08:31 by larsi@gnus.org:
>
>> fatiparty--- via Users list for the GNU Emacs text editor
>> <help-gnu-emacs@gnu.org> writes:
>>
>>> Is there a way to display the line number on each buffer line?
>>>
>>
>> `M-x display-line-numbers-mode'
>>
> That's what I was looking for.  Is there a technique for changing the foreground colour of the line number as well?

You can customise the faces line-number (for all lines) and
line-number-current-line (for the current line).  Use `M-x
customize-face [face name]' to do this interactively.

-- 
	Philip Kaludercic

Display line number on each buffer line

[fatiparty--- via Users list for the GNU Emacs text editor]

Dec 2, 2021, 09:17 by philipk@posteo.net:

> fatiparty--- via Users list for the GNU Emacs text editor
> <help-gnu-emacs@gnu.org> writes:
>
>> Dec 2, 2021, 08:31 by larsi@gnus.org:
>>
>>> fatiparty--- via Users list for the GNU Emacs text editor
>>> <help-gnu-emacs@gnu.org> writes:
>>>
>>>> Is there a way to display the line number on each buffer line?
>>>>
>>>
>>> `M-x display-line-numbers-mode'
>>>
>> That's what I was looking for.  Is there a technique for changing the foreground colour of the line number as well?
>>
>
> You can customise the faces line-number (for all lines) and
> line-number-current-line (for the current line).  Use `M-x
> customize-face [face name]' to do this interactively.
>

That is good, but I want to do that from my init file if possible.  Is there a way to reduce the line number size as well?

Re: Display line number on each buffer line

[Alejandro Barocio A.]

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fatiparty--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> writes:

> Dec 2, 2021, 09:17 by philipk@posteo.net:
>
>> fatiparty--- via Users list for the GNU Emacs text editor
>> <help-gnu-emacs@gnu.org> writes:
>>
>>> Dec 2, 2021, 08:31 by larsi@gnus.org:
>>>
>>>> fatiparty--- via Users list for the GNU Emacs text editor
>>>> <help-gnu-emacs@gnu.org> writes:
>>>>
>>>>> Is there a way to display the line number on each buffer line?
>>>>>
>>>>
>>>> `M-x display-line-numbers-mode'
>>>>
>>> That's what I was looking for.  Is there a technique for changing the foreground colour of the line number as well?
>>>
>>
>> You can customise the faces line-number (for all lines) and
>> line-number-current-line (for the current line).  Use `M-x
>> customize-face [face name]' to do this interactively.
>>
>
> That is good, but I want to do that from my init file if possible.  Is
> there a way to reduce the line number size as well?

All configuration and customization could be done from your init.el.

All customization that changes font, sizes, colours... all is done
customizing your faces.

-- 
Alejandro Barocio A.
Ex nihilo nihil fit.

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Display line number on each buffer line

[fatiparty--- via Users list for the GNU Emacs text editor]

Dec 2, 2021, 13:33 by abarocio80@gmail.com:

>
> fatiparty--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> writes:
>
>> Dec 2, 2021, 09:17 by philipk@posteo.net:
>>
>>> fatiparty--- via Users list for the GNU Emacs text editor
>>> <help-gnu-emacs@gnu.org> writes:
>>>
>>>> Dec 2, 2021, 08:31 by larsi@gnus.org:
>>>>
>>>>> fatiparty--- via Users list for the GNU Emacs text editor
>>>>> <help-gnu-emacs@gnu.org> writes:
>>>>>
>>>>>> Is there a way to display the line number on each buffer line?
>>>>>>
>>>>>
>>>>> `M-x display-line-numbers-mode'
>>>>>
>>>> That's what I was looking for.  Is there a technique for changing the foreground colour of the line number as well?
>>>>
>>>
>>> You can customise the faces line-number (for all lines) and
>>> line-number-current-line (for the current line).  Use `M-x
>>> customize-face [face name]' to do this interactively.
>>>
>>
>> That is good, but I want to do that from my init file if possible.  Is
>> there a way to reduce the line number size as well?
>>
>
> All configuration and customization could be done from your init.el.
>
> All customization that changes font, sizes, colours... all is done
> customizing your faces.
>
What are the keyword names I need to change exactly in my init file?  

Re: Display line number on each buffer line

[Michael Heerdegen]

fatiparty--- via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> That is good, but I want to do that from my init file if possible.  Is
> there a way to reduce the line number size as well?

You can call `face-spec-set' to change the default appearance of a face,
e.g.

#+begin_src emacs-lisp
(face-spec-set 'line-number
               '((t (:foreground "red" :height .6)))
               'face-defface-spec)
#+end_src

The face spec is the same thing as in face definitions.

Michael.

Re: Display line number on each buffer line

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Date: Thu, 02 Dec 2021 15:53:27 +0100
> 
> You can call `face-spec-set' to change the default appearance of a face,
> e.g.
> 
> #+begin_src emacs-lisp
> (face-spec-set 'line-number
>                '((t (:foreground "red" :height .6)))
>                'face-defface-spec)
> #+end_src

In general, set-face-attribute is the recommended method of changing
attributes of faces.

Re: Display line number on each buffer line

[Michael Heerdegen]

Eli Zaretskii <eliz@gnu.org> writes:

> > #+begin_src emacs-lisp
> > (face-spec-set 'line-number
> >                '((t (:foreground "red" :height .6)))
> >                'face-defface-spec)
> > #+end_src
>
> In general, set-face-attribute is the recommended method of changing
> attributes of faces.

Thanks for that clarification.

I am using different color themes, light and dark ones, and AFAIR this
is the reason why I prefer a complete redefinition as above instead of
`set-face-attribute' calls.

Michael.

Re: Display line number on each buffer line

[Philip Kaludercic]

fatiparty--- via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> Dec 2, 2021, 09:17 by philipk@posteo.net:
>
>> fatiparty--- via Users list for the GNU Emacs text editor
>> <help-gnu-emacs@gnu.org> writes:
>>
>>> Dec 2, 2021, 08:31 by larsi@gnus.org:
>>>
>>>> fatiparty--- via Users list for the GNU Emacs text editor
>>>> <help-gnu-emacs@gnu.org> writes:
>>>>
>>>>> Is there a way to display the line number on each buffer line?
>>>>>
>>>>
>>>> `M-x display-line-numbers-mode'
>>>>
>>> That's what I was looking for.  Is there a technique for changing the foreground colour of the line number as well?
>>>
>>
>> You can customise the faces line-number (for all lines) and
>> line-number-current-line (for the current line).  Use `M-x
>> customize-face [face name]' to do this interactively.
>>
>
> That is good, but I want to do that from my init file if possible.  Is there a way to reduce the line number size as well?

Something like this should be enough:

--8<---------------cut here---------------start------------->8---
(set-face-background 'line-number "red")
(set-face-foreground 'line-number-current-line "blue")
--8<---------------cut here---------------end--------------->8---

-- 
	Philip Kaludercic

Display line number on each buffer line

[fatiparty--- via Users list for the GNU Emacs text editor]

Dec 2, 2021, 15:23 by michael_heerdegen@web.de:

> Eli Zaretskii <eliz@gnu.org> writes:
>
>> > #+begin_src emacs-lisp
>> > (face-spec-set 'line-number
>> >                '((t (:foreground "red" :height .6)))
>> >                'face-defface-spec)
>> > #+end_src
>>
>> In general, set-face-attribute is the recommended method of changing
>> attributes of faces.
>>
>
> Thanks for that clarification.
>
> I am using different color themes, light and dark ones, and AFAIR this
> is the reason why I prefer a complete redefinition as above instead of
> `set-face-attribute' calls.
>
> Michael.
>
I think emacs can distinguish between light and dark background.  How does one adapt
the colours so they are different on light and dark frame backgrounds, for reasons of legibility?

Re: Display line number on each buffer line

[Jean Louis]

* fatiparty--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2021-12-02 12:04]:
> Dec 2, 2021, 08:31 by larsi@gnus.org:
> 
> > fatiparty--- via Users list for the GNU Emacs text editor
> > <help-gnu-emacs@gnu.org> writes:
> >
> >> Is there a way to display the line number on each buffer line?
> >>
> >
> > `M-x display-line-numbers-mode'
> >
> That's what I was looking for.  Is there a technique for changing
> the foreground colour of the line number as well?

M-x linum-mode 

works well too

-- 
Jean

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In support of Richard M. Stallman
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Re: Display line number on each buffer line

[Michael Heerdegen]

fatiparty--- via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> I think emacs can distinguish between light and dark background.  How
> does one adapt the colours so they are different on light and dark
> frame backgrounds, for reasons of legibility?

I do it like this:

(face-spec-set 'line-number
               '((((class color) (background dark))
                  :foreground "red" :height .6)
                 (((class color) (background light))
                  :foreground "tan" :height .6))
               'face-defface-spec)

The syntax of face specs is documented in the manual.

For finding good colors you can either try colors interactively with the
customize interface without saving and then copy the color names.  Also
inheriting from other faces is possible, like this:

(face-spec-set 'line-number
               '((t :inherit font-lock-comment-face))
               'face-defface-spec)

This is more appropriate when defining new faces, though.

If you don't want to rely on the custom save file, and you also don't
want to clobber your init file with face settings, an alternative is to
define your own custom theme - see

  (info "(elisp) Custom Themes")

Michael.