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POHow could I improve this solution to the "create index entries" exercise of Emacs Lisp Intro?
 

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  1. POHow could I improve this solution to the "create index entries" exercise of Emacs Lisp Intro?
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    <p>I've programmed this solution for the exercise from section 11.4 (Looping Exercise):</p> <pre><code>(defun texinfo-index-dfns-in-par () "Create an index entry at the beginning of the paragraph for every '@dfn'." (interactive) (save-excursion (forward-paragraph) (let ((bound (point))) (backward-paragraph) (let ((insert-here (point))) (while (search-forward "@dfn{" bound t) (let* ((start (point)) (end (1- (search-forward "}" bound))) (dfn (buffer-substring start end))) (save-excursion (goto-char insert-here) (newline) (setq insert-here (point)) (insert "@cindex " dfn) (while (&lt; insert-here (line-beginning-position)) (join-line)) (end-of-line) (setq insert-here (point)) (forward-paragraph) (setq bound (point))))))))) </code></pre> <p>Though it's working, it feels much to convoluted to me. I'd like to know how this code could be simplified. I'm also interested in other possible improvements.</p> <p><strong>Edit:</strong></p> <p>Tyler's answer was great. With narrowing I could write a much shorter and cleaner version:</p> <pre><code>(defun texinfo-index-dfns-in-par () "Create an index entry at the beginning of the paragraph for every '@dfn'." (interactive) (save-excursion (mark-paragraph) (save-restriction (narrow-to-region (point) (mark)) (while (search-forward "@dfn{" nil t) (let ((start (point)) (end (1- (search-forward "}")))) (save-excursion (goto-char (point-min)) (insert "\n@cindex " (buffer-substring start end)) (while (&gt; (line-number-at-pos) 2) (join-line)) (narrow-to-region (line-end-position) (point-max)))))))) </code></pre>
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