Usage question about bzrlib.builtins.cmd_diff

[Matt Drew]

I can run this command from the command line: 
bzr diff filename -r1..2 
to generate a diff between file filename as it existed at revision 1 and revision 2. 

I want to do the same thing from python. I tried this: 
import bzrlib.builtins 
bzrlib.builtins.cmd_diff().run(file_list=['filename']) 
which gives the diffs between the current working file and the last-checked-in version. I have tried a number of options to get the "-r1..2" to work using the revision argument or the diff_options argument, but nothing has worked yet. Any hints? 

Thanks, 
Matt 
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