appversions

#!/usr/bin/env python

from __future__ import print_function, absolute_import

import csv
import re
import sys
from subprocess import Popen, PIPE

LSREGISTER = ('/System/Library/Frameworks/CoreServices.framework/Versions/A'
              '/Frameworks/LaunchServices.framework/Versions/A'
              '/Support/lsregister')


def parse_bundle(lines):
    bundle = {}
    for line in lines:
        if line.startswith('bundle'):
            line = line[len('bundle'):]

        if re.match('^\t[\w ]+:\s+.+$', line):
            key, val = line.split(':', 1)
            bundle[key.strip()] = val.strip()

    return bundle


def extract_bundles(fp):
    in_bundle = False
    lines = []
    for line in iter(fp.readline, ''):
        if in_bundle:
            if re.match(r'^-+$', line):
                # Got to the end of the bundle
                in_bundle = False
                yield parse_bundle(lines)
                lines = []
                continue

            lines.append(line)
            continue

        if line.startswith('bundle'):
            in_bundle = True
            lines.append(line)


def main():
    proc = Popen([LSREGISTER, '-dump'], stdout=PIPE)
    out = csv.DictWriter(sys.stdout,
                         fieldnames=('identifier', 'name', 'version', 'path'))
    out.writeheader()

    for bundle in extract_bundles(proc.stdout):
        data = {'identifier': bundle['identifier'].split()[0],
                'name': bundle['name'],
                'version': bundle['version'],
                'path': bundle['path']}

        if data['name'] and data['identifier'] != '(0x0)':
            out.writerow(data)

if __name__ == '__main__':
    main()