w.writerow(['Items Still', 'Outstanding On', prev_end_date, 'Appeared By', end_date])

        w.writerow([])

        for trans in prev_uncleared:

            w.writerow(trans)

    return output.getvalue()

def reconciliation_report_path(account, end_date):

    *_, account_name = account.rpartition(':')

    return f'Financial/Controls/Reports-for-Treasurer/{end_date}_{account_name}_bank-reconciliation.csv'

    parser = argparse.ArgumentParser(description='Reconciliation helper')

    parser.add_argument('--beancount-file', required=True)

    parser.add_argument('--account', help='Full account name, e.g. "Liabilities:CreditCard:AMEX"', required=True)

    parser.add_argument('--prev-end-date', type=datetime.date.fromisoformat)

    parser.add_argument('--cur-end-date', type=datetime.date.fromisoformat)

    parser.add_argument('--month', help='YYYY-MM of ending month. Use with --period.')

    parser.add_argument('--period', help='Months in the past to consider. Use with --month.', type=int, choices=[1, 3, 12])

    parser.add_argument('--statement-match')

    parser.add_argument('--cost-function', default='COST')

    parser.add_argument('--grep-output-filename')

    # parser.add_argument('--report-group-regex')

    if args.month or args.period:

        if not (args.month and args.period):

            parser.error('--month and --period must be used together')

    else:

        if not (args.cur_end_date and args.prev_end_date):

            parser.error(' --prev-end-date and --cur-end-date must be used together')

    return args

def beancount_file_exists(path):

    return os.path.isfile(path)

    if not beancount_file_exists(args.beancount_file):

        sys.exit(f'Beancount file does not exist: {args.beancount_file}')

    if args.month or args.period:

        parsed_date = datetime.datetime.strptime(args.month, '%Y-%m').date()

        preDate = end_of_month(parsed_date - relativedelta(months=args.period)).isoformat()

        lastDateInPeriod = end_of_month(parsed_date).isoformat()

        month = args.month

    else:

        preDate = args.prev_end_date

        lastDateInPeriod = args.cur_end_date.isoformat()

        month = args.cur_end_date.strftime('%Y-%m')

    grep_output_file: typing.IO

            headers = [c[0].capitalize() for c in rtypes]

            if desc.startswith('03'):

                uncleared_rows = rrows

            print(desc)

            print(textwrap.indent(tabulate(rrows, headers=headers), '    '))

    uncleared = [(r[0], r[2], r[4] or r[3], r[1]) for r in uncleared_rows]

    report_path = os.path.join(os.getenv('CONSERVANCY_REPOSITORY', ''), reconciliation_report_path(account, lastDateInPeriod))

    # TODO: Make the directory if it doesn't exist.

    with open(report_path, 'w') as f:

        f.write(reconciliation_report(account, lastDateInPeriod, cleared_balance, uncleared, '1900-01-01', all_trans_balance, []))

    print(f'Wrote reconciliation report: {report_path}.')