use_npm_tags.py

#!/usr/bin/env python

'''Convert tags with no leading "v" to NPM's default tag format.'''

import re
import subprocess


OLD_TAG_RE = re.compile(r'^\d+\.\d+')


def tag2npmtag(tag):
    dot_count = tag.count('.')
    if dot_count == 1:
        new_tag = 'v{}.0'.format(tag)
    else:
        new_tag = 'v{}'.format(tag)

    git_show_cmd = ('git', 'show', '-s', '--pretty=format:%ci%n%H')
    git_show = subprocess.check_output(git_show_cmd + (tag,)).splitlines()
    annotation = git_show[3:-2]
    date = git_show[-2]
    ref = git_show[-1]
    git_tag_cmd = ('git', 'tag', '-f', new_tag, ref, '-m', '\n'.join(annotation))
    env = {
        'GIT_COMMITTER_DATE': date,
    }
    subprocess.check_call(git_tag_cmd, env=env)


def main():
    all_tags = subprocess.check_output(('git', 'tag')).splitlines()
    old_tags = [line for line in all_tags if OLD_TAG_RE.match(line)]
    for old_tag in old_tags:
        tag2npmtag(old_tag)


if __name__ == '__main__':
    main()

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