#!/usr/bin/env python3

# This uses the output from "support/git-set-file-times --list" to discern
# the last-modified year of each *.c & *.h file and updates the copyright
# year if it isn't set right.

import sys, os, re, argparse, subprocess
from datetime import datetime

def main():
    latest_year = '2000'

    proc = subprocess.Popen('support/git-set-file-times --list'.split(), stdout=subprocess.PIPE, encoding='utf-8')
    for line in proc.stdout:
        m = re.match(r'^\S\s+(?P<year>\d\d\d\d)\S+\s+\S+\s+(?P<fn>.+)', line)
        if not m:
            print("Failed to parse line from git-set-file-times:", line)
            sys.exit(1)
        m = argparse.Namespace(**m.groupdict())
        if m.year > latest_year:
            latest_year = m.year
    proc.communicate()

    fn = 'latest-year.h'
    with open(fn, 'r', encoding='utf-8') as fh:
        old_txt = fh.read()

    txt = f'#define LATEST_YEAR "{latest_year}"\n'
    if txt != old_txt:
        print(f"Updating {fn} with year {latest_year}")
        with open(fn, 'w', encoding='utf-8') as fh:
            fh.write(txt)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description="Grab the year of the last mod for our c & h files and make sure the LATEST_YEAR value is accurate.")
    args = parser.parse_args()
    main()

# vim: sw=4 et