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Re: vc-annotate error

From: Kevin Rodgers
Subject: Re: vc-annotate error
Date: Fri, 07 Apr 2006 18:40:35 -0600
User-agent: Mozilla Thunderbird 0.9 (X11/20041105)

JD Smith wrote:
vc-annotate is giving me a similar error as was reported earlier for
vc.el revision 1.408:

 (file-error "Cannot open load file" "vc-nil")

This occurs because I have specified a default annotate mode of
'fullscale, and the `vc-annotate-display-autoscale' function still
relies on the variable `vc-annotate-backend' to call the appropriate
backend time functions I wrote years ago.  This was formerly a global
variable, but Stefan's changes to `vc-annotate' circa 1.408 made it buffer

    (with-current-buffer temp-buffer-name
      (set (make-local-variable 'vc-annotate-backend) (vc-backend file))
      (set (make-local-variable 'vc-annotate-parent-file) file)
      (set (make-local-variable 'vc-annotate-parent-rev) rev)
      (set (make-local-variable 'vc-annotate-parent-display-mode)

That snippet immediately follows this:

    (with-output-to-temp-buffer temp-buffer-name
      (vc-call annotate-command file (get-buffer temp-buffer-name) rev))

So could the problem be that those variables are set _after_ the
annotate buffer contents have been inserted and displayed (via
temp-buffer-show-function -> vc-annotate-display-select)?  Shouldn't
they be set before?

For whatever reason, these are not currently being set in the annotate
output buffer, which breaks the auto-scaling annotation display, since
it doesn't know the backend to use.  I haven't figured out how the
buffer-local variables are being lost.  Other annotate display modes
don't have backend-specific functions, so they continue to work.

Are you sure they're not being set at all, vs. being set too late?

Kevin Rodgers

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