Re: same data appears twice, interactive then function body

[Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

Technologist Adams was kind enough to write me a private mail
telling me my function `insert-string-centered' didn't work
when used from Lisp. Well, that's what I think anyway, since
I received it in my mailbox with no reference in the headers
to either gmane.emacs.help or help-gnu-emacs@gnu.org, and it
doesn't seem to be anywhere else to be found, either!

Probably, he wanted to save me from being all embarrassed in
from of everyone. Well, that was kind! But no worries!
Actually, and to be frank about it, this isn't the first
mistake I ever ever made as a programmer...

Anyway here is a new version, that God willing will work even
under such severe circumstances...

(defun insert-string-centered (str &optional width)
  (interactive
   (list (read-from-minibuffer "string: ")
         (string-to-number (read-from-minibuffer "width [window]: " )) ))
  (let*((span    (if (and width (< 0 width)) width (window-text-width)))
        (str-len (length str))
        (pad     (- (/ (- span str-len) 2)
                    (if (zerop (mod str-len 2)) 1 0) ))
        (pad-str (make-string pad ?\s)) )
    (insert pad-str str) ))
(defalias 'isc #'insert-string-centered)

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