Re: log-view-current-tag doesn't return SCCS revision

[Kevin Rodgers <kevin.rodgers@ihs.com>]

I wrote:
>From log-view.el:
> 
> ;; In RCS, a locked revision will look like "revision N.M\tlocked by: FOO".
> (defconst log-view-message-re "^\\(revision \\([.0-9]+\\)\\(?:\t.*\\)?\\|rev \\([0-9]+\\):  .*\\|D \\([.0-9]+\\) .*\\)$")
> 
> Obviously, the revision may be matched by subexpression 2, 4 (not 3), or
> 5 (for SCCS):

Oops, I wasn't aware of this (from emacs-21.3/etc/NEWS):

| * Lisp changes in Emacs 21.1 (see following page for display-related features)
| ...
| ** Regular expressions now support intervals \{n,m\} as well as
| Perl's shy-groups \(?:...\) and non-greedy *? +? and ?? operators.

and this (from emacs-21.3/man/search.texi):

| `\(?: ... \)'
|      specifies a "shy" group that does not record the matched substring;
|      you can't refer back to it with `\D'.  This is useful in
|      mechanically combining regular expressions, so that you can add
|      groups for syntactic purposes without interfering with the
|      numbering of the groups that were written by the user.

I'd wondered why (match-string 4) returned the SCCS version but
(match-string 5) still returned nil.  So the correct patch is:

*** emacs-21.3/lisp/log-view.el.orig	Mon Jan 20 04:03:30 2003
--- emacs-21.3/lisp/log-view.el	Thu Jun 26 16:35:43 2003
***************
*** 144,150 ****
      (forward-line 1)
      (let ((pt (point)))
        (when (re-search-backward log-view-message-re nil t)
! 	(let ((rev (or (match-string 2) (match-string 3))))
  	  (unless (re-search-forward log-view-file-re pt t)
  	    rev))))))
  
--- 144,150 ----
      (forward-line 1)
      (let ((pt (point)))
        (when (re-search-backward log-view-message-re nil t)
! 	(let ((rev (or (match-string 2) (match-string 3) (match-string 4))))
  	  (unless (re-search-forward log-view-file-re pt t)
  	    rev))))))
  

-- 
<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;">Kevin Rodgers</a>