bug#36534: 25.2; mercurial vc-annotate sometimes fails when using the evolve mercurial extension

[Lars Ingebrigtsen <larsi@gnus.org>]

Valentin Gatien-Baron <valentin.gatienbaron@gmail.com> writes:

> Sometimes, vc-annotate in a file tracked by mercurial returns an
> error like this instead of a proper annotate buffer:

[...]

> Step 3 is probably an hg bug. However `hg parent` was deprecated in
> 2014, so people may be reluctant to change it. And it would be simpler
> for vc-hg-working-revision to call `hg log -r . -T {rev}` (vc-git does
> that, so I assume that it works in general on top of fixing the
> current issue). `.` means the current revision, see `hg help revset`.
>
> So something like this:
> (defun vc-hg-working-revision (file)
>   "Hg-specific version of `vc-working-revision'."
>   (ignore-errors
>     (with-output-to-string
>       (vc-hg-command standard-output 0 nil
>     "log" "-r" "." "--template" "{rev}"))))

(This bug report unfortunately got no response at the time.)

I'm pretty unfamiliar with Mercurial, but perhaps Dmitry has some
comments here (added to the Cc's).

-- 
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   bloggy blog: http://lars.ingebrigtsen.no