Re: Git vc-git.el versus Emacs vc-git.el versus Gits git.el

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Alexandre Julliard writes:
 > Brent Goodrick <bgoodr@xxxxxxxxx> writes:
 > 
 > > Hi,
 > >
 > > I have some questions concerning the Emacs Git integration:
 > >
 > >  1. What is the difference between git.el and vc-git.el in the
 > >     git/contrib/emacs directory?
 > 
 > vc-git.el is a backend for the Emacs VC mode, which supports the
 > standard C-x v commands. The advantage is that you can use the same
 > commands for all VCS.
 > 
 > git.el is a project-wide status manager equivalent to pcl-cvs, but
 > specialized for git. Its advantage is that by not trying to be generic
 > it can offer more git-specific functionality that isn't available with
 > VC mode.
 > 
 > They are not exclusive, you can use both at the same time, depending on
 > what operations you are doing.

Sounds reasonable. I plan on using both since they are compatible with
each other.

 > 
 > >  2. There is a vc-git.el in the Emacs top-of-trunk sources, and
 > >     another one in the git/contrib/emacs directory in the Git
 > >     sources. Which one should I use?  If I should use the one in
 > >     Emacs, then why is there one in the Git source tree?
 > 
 > The most recent one is the one in the Emacs trunk, so you should use
 > this if possible. The one in the Git tree is an older version that's no
 > longer maintained, though it can still be useful if you are running an
 > old Emacs version.

Having the git.el and the vc-git.el file in the same git sources
directory, git/contrib/emacs, fouls up standard `require' loading
practice on Emacs 23 since Emacs 23 has vc-git.el in the load-path
already.  This is the way that I have hacked around it in my Emacs 23
setup, which also explains why:

	;; We can't use (add-to-list 'load-path git-emacs-lisp-dir) here because
	;; there is an older version of vc-git.el in that same directory, and we
	;; prefer the one that comes with Emacs 23:
	(load-file (expand-file-name "git.el" git-emacs-lisp-dir))

Since the vc-git.el is old, would it be feasible/desirable to rename
git/contrib/emacs/vc-git.el to git/contrib/emacs/old/vc-git.el so as
to allow older Emacs to continue to load the older version?

I would suppose that if/when git.el is moved into the Emacs sources,
then the same renaming operation would be done for git.el, too.

Also, I could not find any section in the Git manual for git.el.
Given that it is in the contrib directory, perhaps a separate manual
file would be appropriate?

Thanks for your help!
Brent
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