GNU bug report logs - #45068
[PATCH] 28.0.50; Update Modus themes 1.0.2 (backward-incompatible)

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From: Gregory Heytings <gregory <at> heytings.org>
To: Protesilaos Stavrou <info <at> protesilaos.com>
Cc: 45068 <at> debbugs.gnu.org
Subject: bug#45068: [PATCH] Modus themes 1.2.0
Date: Sat, 06 Mar 2021 18:25:22 +0000

>
> 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))))

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

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