Re: RFC on implementation adding buttons beside headings

[Bruno Barbier <brubar.cs@gmail.com>]

pareto optimal <pareto.optimal@mailfence.com> writes:

> I found the only way to place the button where I wanted was to insert
> some blank space after the heading. Is that expected and best practice
> or is there some other way to do it?

FWIW, instead of inserting some blank spaces, you could overlay existing
characters, you'll just need to re-inject them at display time so that
the display doesn't change. That way, you don't modified the text.


Here is a way to add a button, in place, without modifying the
buffer.  The trick is to overlay the EOL and to re-inject an EOL
using the "after-string" property.


     (with-current-buffer (generate-new-buffer "=test")
       (cl-flet ((run (f) (lambda (&rest args) (interactive) (funcall f))))
         (let (pos)
           (insert "* My title\n")
           (setq pos (1- (point)))
           (insert "An amazing note.\n\n")
           (insert "** My 2 title\n")
           (insert "An even more amazing note.\n")
           (org-mode)
           (make-button pos (1+ pos)
                        'before-string "\n\n    "
                        'display '((height 2) "Click me!")
                        'after-string "\n\n"
                        'face 'custom-button
                        'action (run (lambda () (message "Thanks!")))
                        )))
       (pop-to-buffer (current-buffer))
       )
       
Note that the above expression requires lexical-binding.


Bruno