[TxMt] Trapping file open

Is there a way to run some code from a Bundle before TextMate opens a file? The idea would be that when I run either:

$ mate foo.c

or

$ mate myprojectdir

and then click on foo.c I get to see if foo.c is version controlled and then I check it out if it is. The version control system that I use (BitKeeper) has a 'get' mode that checks out the files read-only, and before editing you have to check them out in 'edit' mode. I have written a function in a bundle that does this, but I have to call it manually. I would like that to be automatic...

Thanks,

-Oscar

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