Auto update version.py and git tag version id

update_vid_tag.py

#!/usr/bin/env python3

"""

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This script will:
    - update git tag version id for last commit
    - overwrite all contents in current version.py file

I strongly advise not using the code below and writing your own.
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Auto updates git tag version id and version.py file.
Run from same directory as version.py

version.py format:
    VERSION="1.2.3"

Major version id numbers are not increased. Minor / sub only.
    e.g. 1.2.9 -> 1.3.0

Requires git repo and existing version.py file.

"""

import os
import subprocess


def find_version_file():
    version_file = ''
    for filename in os.listdir():
        if filename.casefold() == 'version.py':
            version_file = filename
            break
    return version_file


def update_git_tag_version_id(version, last_commit_id):
    tag_cmd = 'git tag {} {}'.format(version, last_commit_id)
    subprocess.run(tag_cmd, shell=True)
    print('>>>', tag_cmd)


def update_version_file(version_file, version_id):
    with open(version_file, 'w') as ver:
        txt = 'VERSION="{}"'.format(version_id)
        ver.write(txt)
        ver.write('\n')


def git_command_output(cmd):
    return subprocess.check_output(cmd, shell=True).decode('utf-8').strip()


def get_last_commit_id():
    output = git_command_output('git log --pretty=oneline')
    return output[:10]


def get_current_version():
    return git_command_output('git describe --abbrev=0 --tags')


def update_version_id(cur_ver):
    major, minor, sub = map(int, cur_ver.split('.'))
    sub += 1
    minor += sub // 10
    sub = sub % 10
    return '{}.{}.{}'.format(major, minor, sub)


if __name__ == '__main__':
    version_file = find_version_file()

    if version_file:

        current_version_id = get_current_version()
        new_version_id = update_version_id(current_version_id)
        last_commit_id = get_last_commit_id()
        update_git_tag_version_id(new_version_id, last_commit_id)

        if new_version_id == get_current_version():
            update_version_file(version_file, new_version_id)
            print('>>> version id {} --> {}'.format(current_version_id, new_version_id))

        else:
            print('>>> Unable to update git tag to version id:', new_version_id)

    else:
        print('\nNo version.py found in current directory\n')