main2.py

import os
import json

from git import Git


def run(cwd):
    g = Git(cwd)
    loginfo = g.log("--pretty=format:metadata:%aD,%an,%ae", "--name-only")
    last_modified = {}
    files = []

    def add(these_files, this_metadata):
        for file in these_files:
            if file not in last_modified:
                last_modified[file] = this_metadata["date"]
        files.clear()

    for line in loginfo.splitlines():
        if line.startswith("metadata:"):
            if files:
                add(files, metadata)
            metadata = {"date": line.split(",")[1].strip()}
        elif line:
            files.append(line)

    with open("lastmodified-python.json", "w") as f:
        json.dump(last_modified, f, indent=2)


def main(*args):
    cwd = args[0]
    assert os.path.isdir(cwd)
    run(cwd)


if __name__ == "__main__":
    import sys

    sys.exit(main(*sys.argv[1:]))