Emacs mode to do automatic version numbering?

Emacs mode to do automatic version numbering?

[Andrew Ferrier]

I'm looking for an Emacs mode that will auto-update a version number 
embedded in a buffer when that buffer is saved (similar to the way 
time-stamp auto-updates a time-stamp). I was wondering if anyone knew of 
such a mode or where one could be found? I've looked all around and 
can't find anything similar. Any help would be appreciated.

Regards,
Andrew.

-- 
Andrew Ferrier,
andrew.ferrier@uk.ibm.com

Re: Emacs mode to do automatic version numbering?

[Pascal Bourguignon]

Andrew Ferrier <andrew.ferrier@uk.ibm.com> writes:

> I'm looking for an Emacs mode that will auto-update a version number 
> embedded in a buffer when that buffer is saved (similar to the way 
> time-stamp auto-updates a time-stamp). I was wondering if anyone knew of 
> such a mode or where one could be found? I've looked all around and 
> can't find anything similar. Any help would be appreciated.

Either do like time-stamp and add a write-file-hooks, or add an advice
to save-buffer. This is what I've  done because I have a function that
determines automatically  for all  files what to  update or not  to do
anything from the major mode (the hooks seem to depend on the buffer):

(defadvice save-buffer
  (before my-update-version-save-buffer (&optional ARGS))
  (interactive "p")
  ;;; WARNING: Untested code below:
  (widen)
  (goto-char (point-min))
  (when (re-search-forward "^VERSION: \([0-9]+\.[0-9]+\)$" nil t)
    (replace-match (format "%.3f" (+ 0.001 (string-to-number (match-string 1))))
                   t t nil 1))
  )
(ad-activate 'save-buffer)



-- 
__Pascal_Bourguignon__                   http://www.informatimago.com/
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