#!/usr/bin/env python
# getncdimlen
# cory.r.martin@noaa.gov
# 2019-10-17
# script to return length of requested dimension
# for specified netCDF file
import argparse
import gsi_utils

if __name__ == '__main__':
  parser = argparse.ArgumentParser(
           description='Get length of dimension specified from a FV3GFS netCDF file')
  parser.add_argument('ncfile', help='path to input netCDF file', type=str)
  parser.add_argument('dimname', help='name of dimension (ex: grid_xt)', type=str)
  args = parser.parse_args()
  FileDims = gsi_utils.get_ncdims(args.ncfile)
  print(FileDims[args.dimname])