perl advice

Hello-

Does anyone have a recommendation on how to call R from perl?  I'm using
the IPC::Open2 module, and running R with the --slave and --quiet
options.  The problem is that I can't predict how many lines of output I
should try to read for each command-- if any!

The ultimate goal is to use perl to provide a form-driven web interface,
but have R do the underlying calculations.

A trick that I have used sometimes from tcl/tk is to redefine the
  prompt to some funny string (sending to the controlled process
  a 'option(prompt=...) command at the beginning) and then wait
  for the prompt on the output. If I remember also ESS
  works in a  probably less weaker but similar approach (i.e., it
  waits for a particular regular expression on the standard output
  of the R process).
  Hoping this can help,

  guido
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