For completeness, here is my final code based on Charles's suggestion:
#+begin_src org
,* date formatting with version information :ignoreheading:
,#+NAME: mydateline
,#+BEGIN_SRC emacs-lisp
(format "#+DATE: \\copyright{} %s\n" *this*)
,#+END_SRC
src_shell[:post mydateline() :results raw]{echo -n $(date +%Y) '@@latex:\\
\footnotesize \color{gray}@@' v$(hg id --num)}
#+end_src
This is for export to beamer (well, LaTeX more generally) and outputs
the year with revision information below in light grey (British spelling
I'm told ;-)). I should probably move the copyright symbol into the
shell script but this works...
Thanks again,
eric
--
Eric S Fraga, ericsfraga@<most social media>
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