Shell script filtering

[n8gray]

First off, the BFG cleaner has been invaluable to me on several occasions now, most recently when we switched one of our repos over to using LFS. Thanks for all your work!

My team would like to apply a formatting tool to our repo to make it look like we've always followed a consistent coding style. BFG seems like just the tool for this, since all we're doing is rewriting blobs independently. Clearly it wouldn't make sense to integrate code reformatting into BFG, so I would love to have an option to run blobs through a shell script. I'm willing to take a swing at implementing this feature myself if somebody can give me some pointers on where to hook things in.

Thanks!

[timothywlewis]

It looks like what you want is in the unmerged PR #213.