Herbie accessors should be able to work for a GRIB2 file read by cfgrib that wasn't routed through Herbie

[blaylockbk]

If you read a GRIB2 file into xarray with cfgrib, it is still missing the projection info that Herbie gets from pyproj and pygrib. That means you can't use the

ds = xr.open_dataset("file.grib2", engine='cfgrib')
ds.herbie.crs  # <<-- !! THIS ERRORS, because no projection info

It would be nice if the accessor would do the work to get that info like the H.xarray method already does.

[blaylockbk]

This could be worked on as part of #172

[blaylockbk]

I will need to look for the file path from the cfgrib history

import re
import xarray as xr

ds = xr.open_dataset(FILE, engine='cfgrib')
match = re.search(r'"source": "(.*?)"', ds. History)
Path(match. Group(1)).exists()