Would it be possible to color horizontal lines in org mode?

Would it be possible to color horizontal lines in org mode?

[Alper Alimoglu]

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In markdown mode when I enter `---` (3 dash lines or more), the horizontal
line becomes green.

Would it be possible to obtain the same behavior in `org-mode` where
horizontal lines become colorful?
-------
https://orgmode.org/manual/Horizontal-Rules.html

> 12.9 Horizontal Rules:
> A line consisting of only dashes, and at least 5 of them, is exported
> as a horizontal line.

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Re: Would it be possible to color horizontal lines in org mode?

[Eric S Fraga]

You could use hi-lock-mode to define your own colouring for such
lines.  But I'm sure those that under font-locking better might be able
to add appropriate rules for this horizontal line construct.

-- 
: Eric S Fraga via Emacs 28.0.50, Org 9.5-g9a4a24
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: Would it be possible to color horizontal lines in org mode?

[John Kitchin]

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you can add a rule like this in an org-mode hook:

#+BEGIN_SRC emacs-lisp :results silent
(font-lock-add-keywords
 nil
 '(("^-\\{5,\\}"  0 '(:foreground "red" :weight bold))))
#+END_SRC

that will make a line starting with at least 5 - be red and bold in color.

John

-----------------------------------
Professor John Kitchin (he/him/his)
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu



On Tue, Sep 28, 2021 at 4:00 AM Eric S Fraga <e.fraga@ucl.ac.uk> wrote:

> You could use hi-lock-mode to define your own colouring for such
> lines.  But I'm sure those that under font-locking better might be able
> to add appropriate rules for this horizontal line construct.
>
> --
> : Eric S Fraga via Emacs 28.0.50, Org 9.5-g9a4a24
> : Latest paper written in org: https://arxiv.org/abs/2106.05096
>
>

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Re: Would it be possible to color horizontal lines in org mode?

[Alper Alimoglu]

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Thank you Professor Kitchin. Would something like follows would work?
#+BEGIN_SRC emacs-lisp :results silent
(add-hook 'org-mode-hook (lambda () (font-lock-add-keywords
                                     nil
                                     '(("^-\\{5,\\}"  0 '(:foreground "red"
:weight bold))))))
#+END_SRC

-Alper



On Tue, Sep 28, 2021 at 8:18 PM John Kitchin <jkitchin@andrew.cmu.edu>
wrote:

> you can add a rule like this in an org-mode hook:
>
> #+BEGIN_SRC emacs-lisp :results silent
> (font-lock-add-keywords
>  nil
>  '(("^-\\{5,\\}"  0 '(:foreground "red" :weight bold))))
> #+END_SRC
>
> that will make a line starting with at least 5 - be red and bold in color.
>
> John
>
> -----------------------------------
> Professor John Kitchin (he/him/his)
> Doherty Hall A207F
> Department of Chemical Engineering
> Carnegie Mellon University
> Pittsburgh, PA 15213
> 412-268-7803
> @johnkitchin
> http://kitchingroup.cheme.cmu.edu
>
>
>
> On Tue, Sep 28, 2021 at 4:00 AM Eric S Fraga <e.fraga@ucl.ac.uk> wrote:
>
>> You could use hi-lock-mode to define your own colouring for such
>> lines.  But I'm sure those that under font-locking better might be able
>> to add appropriate rules for this horizontal line construct.
>>
>> --
>> : Eric S Fraga via Emacs 28.0.50, Org 9.5-g9a4a24
>> : Latest paper written in org: https://arxiv.org/abs/2106.05096
>>
>>

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Re: Would it be possible to color horizontal lines in org mode?

[John Kitchin]

This looks correct. Some people prefer to use named functions for this,
so it is easier to remove them, but this works fine.

Alper Alimoglu <alper.alimoglu@gmail.com> writes:

> Thank you Professor Kitchin. Would something like follows would work?
> #+BEGIN_SRC emacs-lisp :results silent
> (add-hook 'org-mode-hook (lambda () (font-lock-add-keywords
>                                      nil
>                                      '(("^-\\{5,\\}"  0 '(:foreground "red" :weight bold))))))
> #+END_SRC
>
> -Alper 
>
> On Tue, Sep 28, 2021 at 8:18 PM John Kitchin <jkitchin@andrew.cmu.edu> wrote:
>
>  you can add a rule like this in an org-mode hook:
>
>  #+BEGIN_SRC emacs-lisp :results silent
>  (font-lock-add-keywords
>   nil
>   '(("^-\\{5,\\}"  0 '(:foreground "red" :weight bold))))
>  #+END_SRC
>
>  that will make a line starting with at least 5 - be red and bold in color.
>
>  John
>
>  -----------------------------------
>  Professor John Kitchin (he/him/his)
>  Doherty Hall A207F
>  Department of Chemical Engineering
>  Carnegie Mellon University
>  Pittsburgh, PA 15213
>  412-268-7803
>  @johnkitchin
>  http://kitchingroup.cheme.cmu.edu
>
>  On Tue, Sep 28, 2021 at 4:00 AM Eric S Fraga <e.fraga@ucl.ac.uk> wrote:
>
>  You could use hi-lock-mode to define your own colouring for such
>  lines.  But I'm sure those that under font-locking better might be able
>  to add appropriate rules for this horizontal line construct.
>
>  -- 
>  : Eric S Fraga via Emacs 28.0.50, Org 9.5-g9a4a24
>  : Latest paper written in org: https://arxiv.org/abs/2106.05096


-- 
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu
Pronouns: he/him/his