kpackage

#!/usr/bin/python

import os
import subprocess
import functools

pkgdata_path = "/var/db/pkg/"

popen = functools.partial(subprocess.Popen, stdout=subprocess.PIPE, universal_newlines=True)

def get_package_configs():
    for category in os.listdir(pkgdata_path):
        category_path = os.path.join(pkgdata_path, category)
        for package in os.listdir(category_path):
            package_path = os.path.join(category_path, package)
            env_path = os.path.join(package_path, "environment.bz2")
            with popen(["bash"], stdin=subprocess.PIPE) as shell:
                with popen(["bzcat", env_path]) as env:
                    shell.stdin.write(env.stdout.read())
                    shell.stdin.write('echo "$CONFIG_CHECK"')
                    shell.stdin.close()
                config = shell.stdout.read().split()
                # Remove tilde sign that just denotes a warning.
                config = [item.lstrip("~") for item in config]
                if config:
                    yield env_path, config

for path, config in get_package_configs():
    print("# {}".format(path))
    for item in config:
        print("CONFIG_" + item)