This approach, to explain in simple terms, is literally replacing the old_text with the new_text.
python3 script.py perceval/__init.py__ "# Copyright (C) 2015-2019 Bitergia" "# Copyright (C) 2015-2020 Bitergia"
Though it kinda weird approach, but it works fine. You can see the changes here https://github.com/chaoss/grimoirelab-perceval/compare/master...vchrombie:license-automation.
| #! /usr/bin/env python | |
| # -*- coding: utf-8 -*- | |
| from tempfile import mkstemp | |
| from shutil import move | |
| from os import remove | |
| import sys | |
| def replace(source_file_path, pattern, substring): | |
| fh, target_file_path = mkstemp() | |
| with open(target_file_path, 'w') as target_file: | |
| with open(source_file_path, 'r') as source_file: | |
| for line in source_file: | |
| target_file.write(line.replace(pattern, substring)) | |
| remove(source_file_path) | |
| move(target_file_path, source_file_path) | |
| if __name__ == '__main__': | |
| if len(sys.argv) == 4: | |
| replace(sys.argv[1], sys.argv[2], sys.argv[3]) | |
| else: | |
| print """Invalid command | |
| Usage: python replacelinesinfile.py [source_file_path] [pattern] [substring] | |
| """ |