#!/usr/bin/env python3
 
 # `ipynb_filter.py`:
 # This is a git filters that strips out the outputs and
 # meta data of a Jupyer notebook using `nbconvert`.
 # Execute the following line in order to activate this filter:
 # python ipynb_filter.py
 #
 # The following line should be in `.gitattributes`:
 # *.ipynb filter=ipynb_filter
 
 from nbconvert.preprocessors import Preprocessor
 
 
 class RemoveMetadata(Preprocessor):
     def preprocess(self, nb, resources):

         nb.metadata = {
             "language_info": {"name": "python", "pygments_lexer": "ipython3"}
         }

         return nb, resources
 
 

 if __name__ == "__main__":

     # The filter is getting activated
     import os

     git_cmd = 'git config filter.ipynb_filter.clean "jupyter nbconvert --to notebook --config ipynb_filter.py --stdin --stdout"'
     os.system(git_cmd)
 else:
     # This script is used as config

     c.Exporter.preprocessors = [RemoveMetadata]  # noqa: F821
     c.ClearOutputPreprocessor.enabled = True  # noqa: F821
     c.ClearOutputPreprocessor.remove_metadata_fields = [  # noqa: F821
         "deletable",
         "editable",
         "collapsed",
         "scrolled",
     ]