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commenting trouble

From: Reynaldo
Subject: commenting trouble
Date: Fri, 09 Jan 2009 16:12:47 -0500
User-agent: Thunderbird (X11/20080914)


Recently I wrote this (my first lines of Emacs Lisp)

(defun comentar (&optional beg end)
  (interactive "r")
    (if (and beg end)
    (comment-region beg end)
      (let ((beg (progn
        (end (progn
    (comment-region beg end)))))

And my purpose was to use the same function to comment a line without
having to select a region, or comment a region (selecting it, of course)
but it doesn't work as expected. If for once I delete the if condition
then it works fine when I comment a line, but i wanted to extend it to
comment a region.

Is this possible? Or does one need to have separate command (and key
bindings) to work on a line or on a region as with kill-line and kill-region


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