Look for git changes not tagged with issue numbers

summarize_git_changes.py

from collections import defaultdict
import re
from subprocess import CalledProcessError, run, PIPE, STDOUT

# Dump list of changed files                                                                                                                                                                               
# git diff --name-only v6.6.3 master                                                                                                                                                                       

# Log of changes to a file between two commits                                                                                                                                                             
# git log v6.6.3..master views/qcs_task/index.rhtml                                                                                                                                                        

# Look for issue numbers in commit messages                                                                                                                                                                
# TODO: Look for final commits of merge requests to find issue number?                                                                                                                                     
# Summarize authors for any that don't belong to an issue.                                                                                                                                                 

def main():
    start = 'v6.6.3'
    end = 'master'
    limit = None
    try:
        result = run(['git', 'diff', '--name-only', start, end],
                     stdout=PIPE,
                     stderr=STDOUT,
                     encoding='UTF8',
                     check=True)
        file_names = result.stdout.splitlines()
        issue_numbers = set()
        author_commits = defaultdict(list)
        for file_name in file_names[:limit]:
            msg_result = run(['git',
                              'log',
                              '--format=%B',
                              f'{start}..{end}',
                              '--',
                              file_name],
                             stdout=PIPE,
                             stderr=STDOUT,
                             encoding='UTF8',
                             check=True)
            log_text = msg_result.stdout
            found_issues = re.findall(r'#(\d+)\W', log_text)
            if found_issues:
                issue_numbers.update(found_issues)
                continue
            title = log_text.splitlines()[0]

            author_result = run(['git',
                                 'log',
                                 '--format=%an',
                                 f'{start}..{end}',
                                 '--',
                                file_name],
                                stdout=PIPE,
                                stderr=STDOUT,
                                encoding='UTF8',
                                check=True)
            author_lines = author_result.stdout.splitlines()
            authors = sorted(set(author_lines))
            print(f'{file_name} - {", ".join(authors)}')
        issue_display = ', '.join(sorted(issue_numbers, key=int))
        print(f'Mentioned issues {issue_display}')
    except CalledProcessError as ex:
        print(ex.stdout)
        raise


main()