[R] Function call on every prompt

[Barry Rowlingson]

Someone on stackoverflow.com was wondering how to display the current
time in the R prompt. I could have swore there was a mechanism for
hooking a function into R such that it is was called before the ">"
prompt was given, but no amount of searching in R's docs, R's source,
or RSiteSearch can find it.

 I've searched for 'hook', 'event', 'signal', and various combinations
of those with 'console', 'prompt', 'after' and 'before' with no joy.
I'm sure other people have asked this on R-help before, but I can't
find those messages either.

 Have I been hallucinating or is my search-fu week this Friday?

Barry