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Clever way to do this?

From: Deniz Dogan
Subject: Clever way to do this?
Date: Thu, 28 Jul 2011 16:55:54 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0

I have a command like this:

(defun ftip-rate-movie (rating)
    (if (not ftip-movie-id)
        (error "Not viewing movie")
(completing-read "Rating: " '("1" "2" "3" "4" "5" "Remove rating") nil t))))
  (unless ftip-movie-id
    (error "Not viewing movie"))

  ;; ...code here

Is there any more intelligent way to do this? I'm not too keen on the code duplication.


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