path: root/algorithms/impl/insertion_sort.py

# Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "Sorting algorithms" project.
# For details, see https://github.com/egor-tensin/sorting-algorithms.
# Distributed under the MIT License.

import sys

from ..algorithm import SortingAlgorithm


def insertion_sort(xs):
    for i in range(1, len(xs)):
        j = i
        while j > 0 and xs[j - 1] > xs[j]:
            xs[j], xs[j - 1] = xs[j - 1], xs[j]
            j -= 1
    return xs


_ALGORITHMS = [
    SortingAlgorithm('insertion_sort', 'Insertion sort', insertion_sort),
]


def _parse_args(args=None):
    if args is None:
        args = sys.argv[1:]
    return list(map(int, args))


def main(args=None):
    xs = _parse_args(args)
    print(insertion_sort(list(xs)))


if __name__ == '__main__':
    main()