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From: John Paul Wallington <jpw@gnu.org>
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Subject: Re: How to search through all buffers?
Date: Sat, 05 Apr 2003 05:44:45 +0100
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I misread `occur-read-primary-args'; this is cleaner:

(defun hanchrow-all-encompassing-occur (regexp &optional hidden-bufs-too)
  "Show all lines in all visible buffers containing a match for REGEXP.
With prefix arg HIDDEN-BUFS-TOO, show lines matching in all buffers."
  (interactive (occur-read-primary-args))
  (multi-occur (if hidden-bufs-too
		   (buffer-list)
		 (delq nil
		       (mapcar (lambda (buf)
				 (unless (string-match "^ " (buffer-name buf))
				   buf))
			       (buffer-list))))
	       regexp))