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From: Kevin Rodgers <ihs_4664@yahoo.com>
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Subject: Re: dired: "!" How to see not just result, but !-cmd too?
Date: Fri, 21 Jan 2005 10:38:34 -0700
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Matthias wrote:
 > Here is a modified `shell-command': it shows the command in the header
 > line of the output buffer.

Ah, now I see what you've done.  Using header-line-format format is much
better than inserting a comment.  But using defadvice is much better
than redefining an 86-line function:

(defadvice shell-command (after insert-command-comment activate)
   "Insert COMMAND as a comment at the top of the output buffer."
   ;; Alternatives to truncating multi-line commands:
   ;; 1. Replace each newline with a semicolon.
   ;; 2. Truncate, but append an ellipsis.
   (save-excursion
     ;; (ad-get-arg 0) == COMMAND
     ;; (ad-get-arg 1) == OUTPUT-BUFFER
     (set-buffer (or (ad-get-arg 1)
                     "*Shell Command Output*"))
     (setq header-line-format
           (replace-regexp-in-string "%" "%%"
                                     (substring (ad-get-arg 0)
                                                0
                                                (string-match "\n"
 
(ad-get-arg 0)))
                                     nil t))))

-- 
Kevin Rodgers