[rtags] Allow to 'derive' rtags Since some releases, rtags (structure underlying uicfg) have selector and may be copied using something like: new_rtags = deepcopy(original_rtags) new_rtags.__module__ = __name__ new_rtags.__select__ = custom_selector The problem is that starting from that, both rtags wil diverge and changes in original_rtags won't be considered, while we usually want to set a few specific rules only in new_rtags. To fix this problem, this cset introduces the notion of "derivated/parent" rtag, eg: new_rtags = original_rtags.derive(__name__, custom_selector) Beside easier copying, when using the above method changes in original_rtags which are not overriden by new_rtags will be considered since it only hold its specific rules but look among its parent chain for non-found keys. Along the way, flake8 unittest_rtags. Closes #16164880

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"""Contains predicates used in Pyramid views.

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"""

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class MatchIsETypePredicate(object):

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    """A predicate that match if a given etype exist in schema.

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    """

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    def __init__(self, matchname, config):

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        self.matchname = matchname

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    def text(self):

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        return 'match_is_etype = %s' % self.matchname

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    phash = text

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    def __call__(self, info, request):

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        return info['match'][self.matchname].lower() in \

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            request.registry['cubicweb.registry'].case_insensitive_etypes

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def includeme(config):

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    config.add_route_predicate('match_is_etype', MatchIsETypePredicate)