On Friday 02 November 2007, FKtPp wrote:
On Thu, Nov 01, 2007 at 06:16:03PM -0500, skip(a)pobox.com wrote:
> It appears there is some support in the new vc for Mercurial (hg).
> When I visit a file I see a mercurial library is loaded. Alas,
> ediff commands seem not to work (e.g. ediff-revision claims the file
> I'm visiting isn't under version control). Are these problems
And if I 'C-x v v' on a already up to date vc-hg version controled
file, I will be prompt to create a rcs subdirectory....
Is this a bug?
Even though the behaviour is unexpected at times, neither of the above are
actually bugs. The new vc package's Mercurial support comes from
mercurial.el which is a "standalone" Mercurial support mode with similar
functionality as vc, but it's not a real vc backend, so not all vc related
features are available with it.
For example, in the above scenario 1, ediff uses various vc-* functions, and
since those know nothing about mercurial.el, the result is that as far as
they're concerned, the file is not under version control. Ditto "C-x v v"
scenario 2 - that's still bound to vc-next-action even when viewing a
Mercurial controlled file (mercurial.el doesn't map that sequence to
anything), and vc-next-action doesn't know about mercurial.el so it picks its
fallback action which supposedly is to register the file in RCS.
At the time I was looking for Mercurial support for XEmacs, mercurial.el was
practically the only "production ready" thing or even close to it that I
could find. Nowadays there's a real mercurial backend (vc-hg.el) in GNU
Emacs CVS; I haven't looked at what it offers, but it's under GPLv3+ so I
don't think we could import it into the XEmacs packages tree currently
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