virtual pseudo code for a simple differential line duplicator, turning some parts of the previous line as placeholders in a temporary yasnippet

templicate.el

(defun templicate ()
  "duplicate the current line as a temporary
snippet to be filled on the fly.
"
  (interactive)
  (let ((line (current-line))
	(placeholders (select-many "word:"))
	(template (mk-yasnippet-from-string line placeholders)))
    (progn
      (open-line)
      (yasnippet-expand template))))