Convert cover hugo front matter "cover_image" key to "image" key

insert_tag.py

"""
Include a safety pig in your code as a warning to other developers that hard-to-read code and crazy hacks follow.
You have been warned!

 _._ _..._ .-',     _.._(`))
'-. `     '  /-._.-'    ',/
   )         \            '.
  / _    _    |             \
 |  a    a    /              |
 \   .-.                     ;  
  '-('' ).-'       ,'       ;
     '-;           |      .'
        \           \    /
        | 7  .__  _.-\   \
        | |  |  ``/  /`  /
       /,_|  |   /,_/   /
          /,_/      '`-'
"""


import os


def main(file_path):
    index = list()

    f = open(file_path, 'r+')

    position = 0

    for line in f:
        position += len(line)

        if '---' in line:
            break

    for line in f:
        position += len(line)

        if '---' in line:
            break
        
        index.append({'pos': position, 'line': line})

    cover_image = normal_image = None

    for idx in index:
        line = idx['line']
        line = line.replace(' ', '')

        lines = [x.strip() for x in line.split(':')]

        if 'cover_image' in lines:
            cover_image = idx
        
        if 'image' in lines:
            normal_image = idx
        
    if cover_image is not None and normal_image is None:
        line = cover_image['line']
        pos = cover_image['pos']

        text = line.split(':')[1].strip()
        text_to_insert = "image: {}\n".format(text)

        with open(file_path, 'r') as temp_file:
            temp_file.seek(pos)
            rest_of_lines = temp_file.read()
        
        f.seek(pos)
        f.write(text_to_insert)
        f.write(rest_of_lines)

    f.close()


def get_file_list(folder_name):
    all_files = [f'{folder_name}/{x}' for x in os.listdir(folder_name) if x.endswith('.md')]
    
    return all_files
    

if __name__ == "__main__":
    files = get_file_list('./blog')

    for f in files:
        main(f)

In my hugo website, zapcircle.net, I was using material theme which was using cover_image key in post's front matter for specifying cover images.

I wanted to try other theme named bigspring, but it used image key in front matter to specify cover image. So this is the script I wrote to find cover_image key from front matter and add another image key with same value as cover_image key.