From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nick Dokos Subject: Re: Capture template and elisp expression Date: Thu, 06 Jan 2011 17:26:29 -0500 Message-ID: <23766.1294352789@gamaville.americas.hpqcorp.net> References: <4D25B0BE.3040408@gmail.com> Reply-To: nicholas.dokos@hp.com Return-path: Received: from [140.186.70.92] (port=50069 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PayHx-0000u6-S0 for emacs-orgmode@gnu.org; Thu, 06 Jan 2011 17:26:35 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PayHv-00056H-Rg for emacs-orgmode@gnu.org; Thu, 06 Jan 2011 17:26:33 -0500 Received: from g4t0016.houston.hp.com ([15.201.24.19]:13243) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PayHv-00055z-KN for emacs-orgmode@gnu.org; Thu, 06 Jan 2011 17:26:31 -0500 In-Reply-To: Message from Rainer M Krug of "Thu, 06 Jan 2011 13:08:30 +0100." <4D25B0BE.3040408@gmail.com> List-Id: "General discussions about Org-mode." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org Errors-To: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org To: Rainer M Krug Cc: nicholas.dokos@hp.com, emacs-orgmode Rainer M Krug 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: Rainer@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: Rainer@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: Rainer@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?