Create script to generate iterator of Aviso files

Inst_eddies/inst_eddies_Aviso.py

+#!/usr/bin/env python3
+
+"""We are assuming that all input NetCDF files are in the same
+directory and that the time coordinate is in days since 1950-1-1."""
+
+import argparse
+import datetime
+from os import path
+import sys
+from dateutil import parser
+import netCDF4
+import inst_eddies
+
+def filename_generator(first_file, first_date, last_date, template, dirname):
+    nc_file = first_file
+    my_date = first_date
+    
+    while True:
+        yield nc_file
+        my_date += datetime.timedelta(1)
+        if my_date > last_date: break
+        basename = my_date.strftime(template)
+        nc_file = path.join(dirname, basename)
+
+argparser = argparse.ArgumentParser()
+argparser.add_argument("first_file",
+                       help = "NetCDF file containing SSH and velocity at a "
+                       "single date")
+argparser.add_argument("--template",
+                       help = "template of basename with date format, only "
+                       "used for several dates")
+argparser.add_argument("-l", "--last_date", help = "%%Y-%%m-%%d")
+argparser.add_argument("-b", "--bbox", nargs=4, type = float,
+                       metavar = ("xmin", "xmax", "ymin", "ymax"))
+args = argparser.parse_args()
+
+# Get the first date from the time coordinate in the NetCDF file:
+with netCDF4.Dataset(args.first_file) as f:
+    d = f["time"][:].item()
+
+d = round(d)
+first_date = datetime.date(1950, 1, 1) + datetime.timedelta(d)
+#--
+
+dirname = path.dirname(args.first_file)
+
+if args.last_date:
+    last_date = parser.parse(args.last_date).date()
+    
+    if last_date > first_date and not args.template:
+        sys.exit("template option required for several dates")
+else:
+    last_date = first_date
+
+inst_eddies.loop_inst_eddies(filename_generator(args.first_file, first_date,
+                                                last_date, args.template,
+                                                dirname), args.bbox, d)