Rainer M Krug <r.m.k...@gmail.com> wrote:
>
> Hi
>
> I want to use a Capture Template to record changes to files under
> version control. Everything works as expected, but I would like to
> include the current revision in the template.
>
> Therefore I tried the following:
>
> * %T %? at %a by Rainer M Krug, email: rai...@krugs.de
> %(vc-working-revision buffer-file-name)
>
> for the template, but I get an error:
>
> **** <2011-01-06 Thu 13:06> at
> [[file:~/Documents/Projects/BiocontrolAndAlienDynamics/nonSpatialAcacia/trunc/R/nsa.org::*Finalise][Finalise]]
> by Rainer M Krug, email: rai...@krugs.de %![Error: (wrong-type-argument
> stringp nil)]
>
> Any idea how I could get the revision of the org file from which the
> Capture has been initiated (here
> ~/Documents/Projects/BiocontrolAndAlienDynamics/nonSpatialAcacia/trunc/R/nsa.org
> )?
>
There are a few problems: the evaluation of the sexp happens in the
capture buffer where buffer-file-name returns nil. Even if you could
get the file name, vc-working-revision would return nil on a file that
is not VC-registered and the template would barf.
Those are easy problems to solve but there is another one that seems
insurmountable (with current code): my original thought was to use the
%a escape to pass the link to a lisp function, extract the file name
from it[fn:1] and run vc-working-revision on it (with appropriate safeguards
to catch non-VC files), something like this:
"* %T %? at %a by Rainer M Krug, email: rai...@krugs.de
%(rk-custom-function-to-get-vc-revision \"%a\")"
However, this fails because at the time that %(sexp) constructs are
expanded, simple %a etc. constructs have not been expanded yet, so what
the function above gets is a literal "%a": the subtitution sequence is
;; %[] Insert contents of a file.
...
;; %() embedded elisp
...
;; Simple %-escapes
(see lisp/org-capture.el, lines 1181-1229 or so).
Moreover, this sequence was different and was changed deliberately (see
the thread http://thread.gmane.org/gmane.emacs.orgmode/27649), so if it
is changed back, Sebastion Rose will not be happy :-)
So it seems there is no way to pass values from the capture context to a
lisp function in the capture template, but maybe I'm missing something.
Thanks,
Nick
Footnotes:
[fn:1] Is there an easier way to get the filename of the file I was
visiting when I initiated the capture? If not, should there be? Perhaps
a %f escape?
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