git-author-list

#!/usr/bin/env python3

import sys
import subprocess


def get_git_authors(revlist) -> list[str]:
    try:
        command = ["git", "log", "--pretty=format:%an", revlist]
        result = subprocess.run(command, capture_output=True, text=True, check=True)
        authors = sorted(list(set(result.stdout.strip().splitlines())))
        return authors
    except Exception as e:
        print(f"An unexpected error occurred: {e}")
        return []


def join_list(items: list[str]) -> str:
    if not items:
        return ""
    if len(items) == 1:
        return items[0]

    items_but_last = ", ".join(items[:-1])

    return f"{items_but_last} and {items[-1]}"


if __name__ == "__main__":
    if len(sys.argv) < 2:
        from pathlib import Path

        script = Path(sys.argv[0]).name
        print(f"Usage: {script} <git-rev-list>")
        print(f"Example: {script} 'v1.0.0..HEAD'")
        sys.exit(1)

    authors = get_git_authors(sys.argv[1])
    print(join_list(authors))