PrivacyScanData/truncate/new2/git-date-truncate-master/git-date-truncate

#!/usr/bin/python3
import argparse
import os
import subprocess

parser = argparse.ArgumentParser(
    prog='git date-truncate',
    description='Truncate dates in the latest commit and drop timezone data.',
)

parser.add_argument('--tips', action='store_true',
    help='show useful tips')

group = parser.add_mutually_exclusive_group()
parser.set_defaults(author=None)
group.add_argument('-a', '--author', dest='author', action='store_true',
    help='force truncate author date')
group.add_argument('--no-author', dest='author', action='store_false',
    help='never truncate author date')

group = parser.add_mutually_exclusive_group()
parser.set_defaults(committer=None)
group.add_argument('-c', '--committer', dest='committer', action='store_true',
    help='force truncate committer date')
group.add_argument('--no-committer', dest='committer', action='store_false',
    help='never truncate committer date')

args = parser.parse_args()

old_hash, author_name, author_email, author_date, committer_name, committer_email, committer_date = subprocess.run(
    'git show -s --date=raw --format=%h%n%an%n%ae%n%ad%n%cn%n%ce%n%cd HEAD'.split(),
    stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, encoding='utf8', check=True,
).stdout.splitlines()

if args.author is None or args.committer is None:
    user_name = subprocess.run(
        'git config user.name'.split(),
        stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, encoding='utf8', check=True,
    ).stdout.strip()
    user_email = subprocess.run(
        'git config user.email'.split(),
        stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, encoding='utf8', check=True,
    ).stdout.strip()

    if args.author is None:
        args.author = author_name == user_name and author_email == user_email

    if args.committer is None:
        args.committer = committer_name == user_name and committer_email == user_email

author_changed = False
if args.author:
    t = int(author_date.split()[0])
    t = f'{t // 86400 * 86400} +0000'
    author_changed = t != author_date
    author_date = t

committer_changed = False
if args.committer:
    t = int(committer_date.split()[0])
    t = f'{t // 86400 * 86400} +0000'
    committer_changed = t != committer_date
    committer_date = t

if author_changed or committer_changed:
    env = dict(os.environ)
    env['GIT_AUTHOR_DATE'] = author_date
    env['GIT_COMMITTER_DATE'] = committer_date
    subprocess.run(
        ['git', 'commit', '-q', '--amend', f'--date={author_date}', '--no-edit', '--only'],
        env=env, check=True,
    )
    new_hash = subprocess.run(
        'git show -s --format=%h HEAD'.split(),
        stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, encoding='utf8', check=True,
    ).stdout.strip()

    s = {
        (True, False): 'author date',
        (False, True): 'committer date',
        (True, True): 'author date and committer date',
    }[author_changed, committer_changed]
    print(f'date-truncate: {old_hash} -> {new_hash} (truncated {s})')
    if args.tips:
        print(f'  (use "git reset {old_hash}" to undo)')