“1 of n” result for Emacs search

Question

When I use incremental search in emacs I can\'t know where I am in whole matches. In Chrome browser it says location using \"2 of 30\". How can I do that in Emacs?

Answer 1

Add the following to your emacs init file. Despite the use of count-matches, it works very fast on my laptop. I have not tried it with very large files.

(defun my-isearch-update-post-hook()
  (let (suffix num-before num-after num-total)
    (setq num-before (count-matches isearch-string (point-min) (point)))
    (setq num-after (count-matches isearch-string (point) (point-max)))
    (setq num-total (+ num-before num-after))
    (setq suffix (if (= num-total 0)
                     ""
                   (format " [%d of %d]" num-before num-total)))
    (setq isearch-message-suffix-add suffix)
    (isearch-message)))

(add-hook 'isearch-update-post-hook 'my-isearch-update-post-hook)