Re: hline

[Jean Louis]

* Tim Visher <tim.visher@gmail.com> [2021-01-07 17:52]:
> On Thu, Jan 7, 2021 at 4:53 AM Jean Louis <bugs@gnu.support> wrote:
> 
> > * Emanuel Berg via Users list for the GNU Emacs text editor <
> > help-gnu-emacs@gnu.org> [2021-01-07 09:24]:
> > > (defun hline (&optional char)
> > >   (interactive "P")
> > >   (let ((len (- (window-width) (current-column) 1))
> > >         (c (or char ?-)) )
> > >     (insert (make-string len c)) ))
> >
> > I can undertand and find it useful. But you should maybe think of
> > auto-fill-mode and fill-column, is it?
> >
> > If fill-column is 70, should line really go over all the visible
> > window screen? As text does not.
> >
> 
> I've done something similar to this that respected fill-column. I use it
> quite a bit when writing software.
> 
> ```
(defun header-comment (comment)
  "Insert a header COMMENT

A header comment is a line of comment characters fill-column
long, a line of 3 comment characters followed by a space then
COMMENT, and a line of comment characters fill-column long
again."
  (interactive "sComment: ")
  (let* ((comment-char (string-to-char comment-start))
         (wrapper (make-string fill-column comment-char))
         (comment-line (format "%s %s"
                               (make-string 3 comment-char)
                               comment)))
    (insert wrapper "\n" comment-line "\n" wrapper)))

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>>> Something
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

My similar thing
================

(defun underline-text (text &optional no-newlines)
  "Asks for TEXT and returns it underlined. If optional
NEW-NEWLINES is true, it will not add new lines."
  (let* ((l (length text))
         (newlines (if no-newlines "" "\n\n")))
    (format "%s\n%s%s" text
            (with-output-to-string
              (let ((count 0))
                (while (< count l)
                  (princ "=")
                  (setq count (1+ count)))))
            newlines)))

(defun underline-text-interactive (text)
  "Underlines and insert text into buffer"
  (interactive "sText: ")
  (insert (underline-text text)))