Add basic logging (closes #108)

climix/index.py

 # -*- coding: utf-8 -*-
 
+import logging
+
 import iris
 
 from .aggregators import PointLocalAggregator
@@ -16,9 +18,13 @@ class Index:
 
 
     def __call__(self, cube, sliced_mode=False):
+        logging.info('Adding coord categorisation.')
         coord_name = self.period.add_coord_categorisation(cube)
+        logging.info('Extracting period cube')
         sub_cube = cube.extract(self.period.constraint)
+        logging.info('Preparing cube')
         self.index_function.prepare(sub_cube)
+        logging.info('Setting up aggregation')
         aggregated = sub_cube.aggregated_by(coord_name, self.aggregator,
                                             period=self.period)
         if sliced_mode:

climix/main.py

@@ -17,6 +17,9 @@ from .index import Index
 from .index_functions import SUPPORTED_OPERATORS, SUPPORTED_REDUCERS
 from .period import PeriodSpecification
 
+import logging
+logging.basicConfig(level=logging.INFO)
+
 
 MISSVAL = 1.0e20
 
@@ -161,11 +164,17 @@ def build_output_filename(index, datafiles, output_template):
 
 
 def do_main(requested_indices, datafiles, output_template, sliced_mode):
+    logging.info('Loading metadata')
     metadata = load_metadata()
+    logging.info('Preparing indices')
     indices = prepare_indices(metadata['indices'], requested_indices)
     for index in indices:
+        logging.info(f'Starting calculations for index {index}')
+        logging.info('Building output filename')
         output_filename = build_output_filename(index, datafiles, output_template)
+        logging.info('Preparing input data')
         input_data = prepare_input_data(datafiles)
+        logging.info('Calculating index')
         result = index(input_data, sliced_mode=sliced_mode)
         iris.save(result, output_filename, fill_value=MISSVAL,
                   local_keys=['proposed_standard_name'])