I've been looking through the forum trying to spot something that would do this. I thought I had seen something like this once.

Does anyone know of a crop to selection script?

Such command already exists under the Layer menu, or under the Image menu (depending upon what result you desire).

If instead of cropping, you desire to erase everything outside of the selection then I'd recommend my Isolate script.

I love this isolation filter because it allows you to get a real good selection from a nice path and then crop to the exact selection and not just a rectangular one. Very handy for difficult background removal.

Thanks Saul. I found the autocrop under Layer. Hadn't gone that far left on the toolbar.