variable command interpretter

[Paul . Emsley]

       Hi, 

       A team is about to start designing/writing a molecular graphics
      program.  No code has been written yet. They need a command
      language to do e.g. scripting and atom/molecular manipulations
      and "command prompt".  At the moment the team are thinking of
      using python as the base language.  Is is possible to design the
      program so that the user gets to choose the command language?  I
      of course would be interested in using guile.

      e.g.:  alter (chain D) chain="E"
             alter (resi 1:50) ajust-residue-number +45

      (or whatever syntax)

      Hope this makes some sense...

      Paul.