Rainer M Krug <address@hidden> 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: address@hidden
%(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: address@hidden %![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: address@hidden %(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?