Exceptional USE flags

find-excl-use-flags.py

#!/usr/bin/env python
import re
import sys

from sh import eix

if __name__ == '__main__':
    atoms = eix(('-I', '--nocolor', '--only-names')).strip().splitlines()
    with open('/etc/portage/make.conf') as fp:
        use_flags = []
        for line in fp.read().splitlines():
            if not line.startswith('USE='):
                continue

            use_flags = sorted(x.strip('"') for x in line.split('=')[1].split(' '))
            break

    for atom in atoms:
        for line in eix(('-I', '--nocolor', atom)).stdout.readlines():
            if 'Installed versions' not in line:
                continue

            flags = None
            for i in reversed(range(2, 5)):
                try:
                    flags = line.strip().split('(')[i].rstrip(')').split(' ')
                    flags = [x for x in flags if not re.search(r'[A-Z]', x)]
                    flags = [x for x in flags if not re.match(r'^[0-9]+[\:/]', x)]
                except IndexError:
                    continue

            if not flags:
                print('Assuming no USE flags for %s' % (atom,), file=sys.stderr)
                break

            flags = [x for x in flags if x not in use_flags]
            if not flags:
                print('No exclusive USE flags for %s' % (atom,), file=sys.stderr)
                break

            print('%s -> %s' % (atom, flags,))