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Re: replace-in-string and backward-delete-char [help request!]

From: Michael Slass
Subject: Re: replace-in-string and backward-delete-char [help request!]
Date: Mon, 18 Nov 2002 19:01:52 GMT
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

Joe Corneli <> writes:

>Hello --
>I am running XEmacs version 21.5  (beta4) "bamboo"  for
>darwin 6.0.   I expect that won't be hugely relevant but
>thought I should mention it before proceeding.
>I wrote the following code (below). It has 2 problems. The first
>is that replace-in-string does not seem to have any effect.
>The second is that backward-delete-char copies the deleted stuff
>to the kill ring even though I ask it not to (at least
>I think that I'm interpreting the documentation properly by
>adding an explicit "nil" at the end. -- Behavior is the same
>for me when I put nothing after the "3").
>Suggestions?  I'm open to someone rewriting the code entirely
>if he or she has a better way to do this. I just want it
>to work....
>Joe Corneli
>(defun cite-last-n-words (n)
>"Copy last ARG words to point and wrap with TeX citation markup."
>   (interactive "p")
>   (backward-kill-word n)
>   (yank)
>   (insert " \\cite{")
>   (kill-new
>   ; stuff I can't get to work properly--------
>     (replace-in-string
>      (replace-in-string
>       (prin1-to-string (yank))
>       " " "_")
>      "[\n]" "_")
>   ; --------stuff I can't get to work properly
>    )
>   (yank)
>   ;; need to rid of trailing nil... but I don't like it being added to
>   ;; kill ring even though I indicate I don't want it there.
>   (backward-delete-char 3 nil)
>   (delete-horizontal-space)
>   (insert "} ")
>   )

I'm not sure if you're trying to wrap the current n word in \cite{...}
in place, or trying to place such a string on the kill ring.  Here's a
solution for each. The only magic is the (save-excursion ...) form, for
which you should read the docs, 

(defun cite-last-n-words (word-count)
  "Wrap WORD-COUNT words before the point in TeX \\cite{...}"
  (interactive "p")
  (insert "}")
    (backward-word word-count)
    (insert "\\cite{")))

(defun add-last-n-words-citation-to-kill (word-count)
  "Add to kill ring: \"\\cite{<last WORD-COUNT words>}\""
  (interactive "p")
  (let* ((beg
            (backward-word word-count)
         (entry (concat "\\cite{"
                        (buffer-substring beg (point))
    (kill-new entry)
    (message "Created kill ring entry: %s" entry)))

Mike Slass

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