bug#45068: [PATCH] Modus themes 1.2.0

[Protesilaos Stavrou <info@protesilaos.com>]

On 2021-03-06, 18:25 +0000, Gregory Heytings <gregory@heytings.org> wrote:

>>
>> It works.  Thank you!
>>
>
> You are welcome :-)  Actually the previous version had a bug with
> tab-indented lines.  It is fixed now:
>
> (defun undercaret (&optional arg)
>   (interactive "p")
>   (let* ((begin (if (region-active-p) (region-beginning) (line-beginning-position)))
>          (end (if (region-active-p) (region-end) (line-end-position)))
>          (lines (- (line-number-at-pos end) (line-number-at-pos begin) -1))
>          (comment (and (/= arg 1) (= lines 1)))
>          (final-forward-line -1))
>     (goto-char begin)
>     (dotimes (i lines)
>       (let* ((line-begin (if (zerop i) begin (line-beginning-position)))
>              (line-end (if (= (1+ i) lines) end (line-end-position)))
>              (begin-column (progn (goto-char line-begin) (current-column)))
>              (end-column (progn (goto-char line-end) (current-column)))
>              (prefix-begin (line-beginning-position))
>              (prefix-end (progn (beginning-of-line-text) (point)))
>              (prefix-end-column (progn (goto-char prefix-end) (current-column)))
>              (delta (if (< begin-column prefix-end-column) (- prefix-end-column begin-column) 0))
>              (prefix-string (buffer-substring-no-properties prefix-begin prefix-end))
>              (prefix (if (string-match-p "\\` *\\'" prefix-string) "" prefix-string))
>              (whitespace (make-string (- (+ begin-column delta) (string-width prefix)) ?\ ))
>              (do-under (< delta (- line-end line-begin)))
>              (under (if do-under (make-string (- end-column begin-column delta) ?^) ""))
>              (under-string (concat prefix whitespace under "\n")))
>         (forward-line 1)
>         (if do-under (insert under-string) (setq final-forward-line -2))
>         (setq end (+ end (length under-string)))
>         (when comment (insert prefix whitespace "\n"))))
>     (forward-line final-forward-line)
>     (goto-char (line-end-position))))

I admit not to have tested it thoroughly (not yet, anyway).  Though I do
plan to use your function.  Thanks!

I will eventually include it in my public dotfiles' repo.  Is there a
link I could provide as a reference to your contribution?  Or just cite
the message in this thread?[1]

[1]: <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=45068#250>.

> (BTW, sorry for the off-topic noise on your thread on modus-themes, but
> it was you who asked for a solution ;-))

Yes, I guess this is not the right place to discuss this feature...
Though the bug has been closed successfully.

I had asked because I was under the impression that Gnus or some other
library was implementing it.

-- 
Protesilaos Stavrou
protesilaos.com