@classmethod

    def classify(cls, related: core.RelatedPostings) -> 'AccrualAccount':

        for account in cls:

            account_name = account.value.name

            if all(post.account.is_under(account_name) for post in related):

                return account

        raise ValueError("unrecognized account set in related postings")

    @property

    def normalize_amount(self) -> Callable[[T], T]:

        return core.normalize_amount_func(self.value.name)

class AccrualPostings(core.RelatedPostings):

    __slots__ = ()

    @classmethod

    def make_consistent(cls,

                        postings: Iterable[data.Posting],

    ) -> Iterator[Tuple[Hashable, 'AccrualPostings']]:

        accruals: Dict[Tuple[str, ...], List[data.Posting]] = collections.defaultdict(list)

        payments: Dict[Tuple[str, ...], Deque[data.Posting]] = collections.defaultdict(Deque)

        key: Tuple[str, ...]

        for post in postings:

            norm_func = core.normalize_amount_func(post.account)

            entity = str(post.meta.get('entity', 'BlankEntity'))

                invoice = entity

            else:

                invoice = str(post.meta.get('invoice', 'BlankInvoice'))

            if norm_func(post.units.number) >= 0:

                key = (post.meta.date.isoformat(), entity, invoice, post.account)

                accruals[key].append(post)

            else:

                key = (invoice, post.account)

                payments[key].append(post)

        for key, acc_posts in accruals.items():

            pay_posts = payments[key[2:]]

            if not pay_posts:

                continue

            norm_func = core.normalize_amount_func(key[-1])

            balance = norm_func(core.MutableBalance(post.at_cost() for post in acc_posts))

            while pay_posts and not balance.le_zero():

                pay_post = pay_posts.popleft()

                acc_posts.append(pay_post)

                balance += norm_func(pay_post.at_cost())

            if balance.le_zero() and not balance.is_zero():

                # pay_post causes the accrual to be overpaid. Split it into two

                # synthesized postings: one that causes the accrual to be

                # exactly zero, and one with the remainder back in payments.

#!/usr/bin/env python3

from setuptools import setup

setup(

    name='conservancy_beancount',

    description="Plugin, library, and reports for reading Conservancy's books",

    author='Software Freedom Conservancy',

    author_email='info@sfconservancy.org',

    license='GNU AGPLv3+',

    install_requires=[

        'babel>=2.6',  # Debian:python3-babel

        'beancount>=2.2',  # Debian:beancount

        'GitPython>=2.0',  # Debian:python3-git

        # 1.4.1 crashes when trying to save some documents.

        'odfpy>=1.4.0,!=1.4.1',  # Debian:python3-odf

        'PyYAML>=3.0',  # Debian:python3-yaml

        'regex',  # Debian:python3-regex

        'rt>=2.0',

    ],

    setup_requires=[

        'pytest-mypy',

        'pytest-runner',  # Debian:python3-pytest-runner

    ],

    tests_require=[

        'mypy>=0.770',  # Debian:python3-mypy

        'pytest',  # Debian:python3-pytest

    ],

    packages=[