#!/usr/bin/env python

import argparse
from subprocess import check_call
from typing import List, Dict, Union

from .lister import list_files

def do_replace(listing, old_string, new_string):
    # type: (Union[Dict[str, List[str]], List[str]], str, str) -> None
    for filename in listing:
        regex = 's/{}/{}/g'.format(old_string, new_string)
        check_call(['sed', '-i', regex, filename])

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Replace string in files')
    parser.add_argument('old_string', help="String to replace")
    parser.add_argument('new_string', help="String to replace with")
    parser.add_argument('targets', nargs='*', default=[],
                        help='files and directories to include in the result. '
                             'If this is not specified, the current directory '
                             'is used')
    parser.add_argument('-m', '--modified', action='store_true',
                        default=False, help='list only modified files')
    parser.add_argument('-f', '--ftypes', nargs='+', default=[],
                        help='list of file types to filter on. All files are '
                             'included if this option is absent')
    parser.add_argument('--ext-only', dest='extonly', action='store_true',
                        default=False,
                        help='only use extension to determine file type')
    parser.add_argument('--exclude', nargs='+', default=[],
                        help='list of files and directories to exclude from '
                             'results, relative to repo root')
    parser.add_argument('--extless-only', dest='extless_only',
                        action='store_true', default=False,
                        help='only include extensionless files in output')
    args = parser.parse_args()

    listing = list_files(targets=args.targets, ftypes=args.ftypes,
                         use_shebang=not args.extonly,
                         modified_only=args.modified,
                         exclude=args.exclude,
                         extless_only=args.extless_only)

    do_replace(listing, args.old_string, args.new_string)