[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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from __future__ import absolute_import

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import markdown

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import logging

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log = logging.getLogger(__name__)

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def markdown_publish(context, data):

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    """publish a string formatted as MarkDown Text to HTML

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    :type context: a cubicweb application object

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    :type data: str

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    :param data: some MarkDown text

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    :rtype: unicode

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    :return:

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      the data formatted as HTML or the original data if an error occurred

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    """

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    md = markdown.Markdown()

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    try:

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        return md.convert(data)

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    except:

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        import traceback; traceback.print_exc()

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        log.exception("Error while converting Markdown to HTML")

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        return data