[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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"""This module compare the Schema on the file system to the one in the database"""

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from cStringIO import StringIO

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from cubicweb.web.schemaviewer import SchemaViewer

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from logilab.common.ureports import TextWriter

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import difflib

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viewer = SchemaViewer()

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layout_db = viewer.visit_schema(schema, display_relations=True)

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layout_fs = viewer.visit_schema(fsschema, display_relations=True)

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writer = TextWriter()

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stream_db = StringIO()

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stream_fs = StringIO()

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writer.format(layout_db, stream=stream_db)

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writer.format(layout_fs, stream=stream_fs)

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stream_db.seek(0)

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stream_fs.seek(0)

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db = stream_db.getvalue().splitlines()

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fs = stream_fs.getvalue().splitlines()

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open('db_schema.txt', 'w').write(stream_db.getvalue())

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open('fs_schema.txt', 'w').write(stream_fs.getvalue())

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#for diff in difflib.ndiff(fs, db):

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#    print diff