"""
Basically same as
`sphinx gettext buidler <https://www.sphinx-doc.org/en/master/_modules/sphinx/builders/gettext.html>`_,
but only get texts from files in a whitelist.
"""

import re

from docutils import nodes
from sphinx.application import Sphinx
from sphinx.builders.gettext import MessageCatalogBuilder


class PartialMessageCatalogBuilder(MessageCatalogBuilder):
    name = 'getpartialtext'

    def init(self):
        super().init()

        self.whitelist_docs = [re.compile(x) for x in self.config.gettext_documents]

    def write_doc(self, docname: str, doctree: nodes.document) -> None:
        for doc_re in self.whitelist_docs:
            if doc_re.match(docname):
                return super().write_doc(docname, doctree)


def setup(app: Sphinx):
    app.add_builder(PartialMessageCatalogBuilder)
    app.add_config_value('gettext_documents', [], 'gettext')