[RFC] generalized diff plugin - option name?

[Stephen Ward]

Hi,

I'm looking to expand the 'bzr kompare' plugin into a general-purpose diff 
tools plugin which will extend the 'bzr diff' command with a new option (to 
specify the external diff tool).  Here are the option names I'm currently 
considering.  If you have a strong preference for/against any of these, or 
you think you have a better suggestion, please let me know.

  --using
  --with
  --tool
  --diff-tool

as in:

  diff --using meld -r 95..98 FILE

My own preference is for '--using', but I don't feel very strongly about it, 
since I only expect to type the option once (in the ALIASES section of 
bazaar.conf).

-- Steve