Generate a .redirects file to include in nginx, from a Ghost blog JSON export

nginx_redirect_generator_for_ghost.py

#!/usr/bin/env python
# USAGE: ./nginx_redirect_generator.py /lucas/blog < ghost_export.json

import datetime, json, os, sys

path_prefix = sys.argv[1]

ghost_db = json.loads(sys.stdin.read())
posts = ghost_db['db'][0]['data']['posts']

for post in posts:
    slug = post['slug']
    date = datetime.datetime.strptime(post['created_at'], '%Y-%m-%d %H:%M:%S')
    old_path = '{}/{}'.format(date.strftime('%Y/%m/%d'), slug)
    print('rewrite ^{path_prefix}/{old_path}/?$ {path_prefix}/{slug} permanent;'.format(**locals()))