tag.py

#!/usr/bin/env python3
import argparse
import os
import re
import subprocess
import fileinput
import sys

def check_version_format(version):
    pattern = re.compile(r'^v?\d+\.\d+\.\d+$')
    return pattern.match(version) is not None

def check_tag_exists(tag):
    try:
        subprocess.check_output(['git', 'rev-parse', tag], stderr=subprocess.STDOUT)
        return True
    except subprocess.CalledProcessError:
        return False

def write_version(version):
    print(f'--- Updating version in app/src/main/AndroidManifest.xml to {version}')
    major, minor, patch = map(int, version.split('.'))
    version_code = 1000000*major + 1000*minor + patch
    version_name_line = re.compile(r'\bandroid:versionName=".*"')
    version_code_line = re.compile(r'\bandroid:versionCode=".*"')
    with fileinput.FileInput('app/src/main/AndroidManifest.xml', inplace=True) as f:
        for line in f:
            line = version_name_line.sub(f'android:versionName="{version}"', line)
            print(version_code_line.sub(f'android:versionCode="{version_code}"', line), end='')


def run_command(args):
    print(f'--- Running command: {" ".join(args)}')
    subprocess.check_call(args)

def check_version_to_commit():
    cmd = ['git', 'diff', '--cached', 'app/src/main/AndroidManifest.xml']
    return subprocess.check_output(cmd) != b''

def commit_change(version):
    run_command(['git', 'add', 'app/src/main/AndroidManifest.xml'])
    if not check_version_to_commit():
        print('--- Version did not change, nothing to commit')
        return
    run_command(['git', 'commit', '-m', f'Release {version}'])

def create_tag(tag, force):
    if force:
        run_command(['git', 'tag', '-f', tag])
    else:
        run_command(['git', 'tag', tag])

def push_change(remote, tag, force):
    run_command(['git', 'push', remote, 'HEAD'])
    if force:
        run_command(['git', 'push', '-f', remote, tag])
    else:
        run_command(['git', 'push', remote, tag])

def main():
    os.chdir(os.path.dirname(os.path.realpath(__file__)))

    parser = argparse.ArgumentParser(description='Create and push tag for new release')
    parser.add_argument('--push', metavar='REMOTE', required=False,
                        help='remote to push (e.g. "origin")')
    parser.add_argument('-f', '--force', action='store_true', required=False,
                        help='force creation of tag, even when already exists')
    parser.add_argument('version', metavar='VERSION',
                        help='version to release ("N.N.N" or "vN.N.N")')
    args = parser.parse_args()

    version = args.version
    if not check_version_format(version):
        print(f'Error: version "{version}" is not in correct format,'
              ' expected "N.N.N" or "vN.N.N"', file=sys.stderr)
        sys.exit(1)

    version = version.lstrip('v')
    remote = args.push
    force = args.force
    tag = f'v{version}'

    if not force and check_tag_exists(tag):
        print(f'Error: tag "{tag}" already exists', file=sys.stderr)
        sys.exit(1)

    write_version(version)
    commit_change(version)
    create_tag(tag, force)
    if remote:
        push_change(remote, tag, force)
    print(f'--- Successfully released {tag}')

if __name__ == '__main__':
    main()