#! /usr/bin/env python

import os
import re
from itertools import chain

_macros = None
def macros_list():
    # List of macros in pyconfig.h.in.
    global _macros
    if _macros is None:
        with open('pyconfig.h.in') as f:
            _macros = (m.group('macro') for m in
                       re.finditer(r'\n#\s*undef\s+(?P<macro>\S+)(?=[ \n])',
                                   f.read()))
    return _macros

def sources_list():
    def uncommented_lines(f):
        for line in f:
            if not line.startswith('#') and not '-DPy_BUILD_CORE' in line:
                yield (m.group('source') for m in
                       re.finditer(r'\s+(?P<source>\S+\.c)(?=[ \t\n])',
                                   line))

    # List of the sources that do not access the interpreter internals.
    with open('Modules/Setup.dist') as f:
        return chain(*list(uncommented_lines(f)))

def main():
    #print(list(macros_list()))
    #print(list(sources_list()))

    # Print the list of pyconfig.h.in macros that are being used by one of the
    # standard library extension modules that do not access the interpreter
    # internals.
    for source in sources_list():
        with open(os.path.join('Modules', source)) as f:
            content = f.read()
            for macro in macros_list():
                if macro in content:
                    print('%s: %s' % (source, macro))

if __name__ == '__main__':
    main()