[R-wiki] sourcing code from wiki

[Gabor Grothendieck]

This was just posted to r-help:

   https://www.stat.math.ethz.ch/pipermail/r-help/2006-July/109931.html

Now suppose we wanted to run the code on the wiki page referenced
in that post.  Currently I copy and paste the code from that wiki page into an R
session (or else into a file, save it and source it).  It would be
convenient if it were possible to source the code for each of the code snippets
on the referenced wiki page directly:

   source("http://...whatever...")

Is this already possible?
If so, how does one discover the url?

If not,it would be nice to have some feature to facilitate grabbing code
from the wiki.