unairy delimited at point (snippet)

["Andreas Röhler" <andreas.roehler@online.de>]

just for fun...
comments welcome.


Andreas

--
https://code.launchpad.net/~a-roehler/python-mode
https://code.launchpad.net/s-x-emacs-werkstatt/

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(defun unairy-delimited-atpt (char arg)
   "Takes any char inserted at prompt as delimiter.
Returns the string if any. With ARG 2 the bounds of this string are 
returned as a list, with ARG 3 it's lenght, a number.

If looking for parentized, braced at point etc., its delivered with 
thing-at-point-utils.el at
https://code.launchpad.net/s-x-emacs-werkstatt  "
   (interactive "cinsert: \np")
   (let*
       ((orig (point))
        (char (char-to-string char))
        (beg (search-backward char nil t 1))
        (end (progn
               (when (looking-at char)
                 (push-mark)
                 (goto-char (match-end 0)))
               (search-forward char nil t 1)))
        (erg
         (when (ignore-errors (and (< beg end)(<= beg orig)(<= orig end)))
           (cond ((eq 1 arg)
                  (buffer-substring-no-properties beg end))
                 ((eq 2 arg)
                  (list beg end))
                 ((eq 3 arg)
                  (- end beg))))))
     (exchange-point-and-mark)
     (when (interactive-p) (message "%s" erg))
     erg))