#!/usr/bin/env python3
import subprocess


def main():
    shortlog = subprocess.check_output([
        'git',
        'shortlog',
        '--summary',
    ]).decode()
    authors = []
    for log_line in shortlog.splitlines():
        authors.append(log_line.split(None, 1)[1])
    first_commits_by_author = []
    for author in authors:
        commits = subprocess.check_output([
            'git',
            'log',
            f'--author={author}',
            '--reverse',
            "--pretty=format:%at,%ad,%an",
            '--date=short',
        ]).decode()
        first_commits_by_author.append(commits.splitlines()[0].split(','))
    header = 'timestamp,date,author,contributor_number'
    data = []
    sorted_committers = sorted(first_commits_by_author, key=lambda x: x[0])
    for contributer_count_zero_indexed, x in enumerate(sorted_committers):
        contributer_count = contributer_count_zero_indexed + 1
        x.append(str(contributer_count))
        data.append(','.join(x))
    print(header)
    for datum in data:
        print(datum)


if __name__ == '__main__':
    main()