Handle virtualenv development mode Looking for VIRTUAL_ENV environment variable as a sign of virtualenv activation. This at least works for developing CubicWeb itself (not sure yet about cubes). And it makes `tox --develop` work as well. Add a test for cwconfig._find_prefix within a virtualenv. In tox.ini, use `develop option`_ accordingly. This makes tox running significantly faster since it avoids building and installing the sdist. Aside, the "develop" install is now performed *after* all test requirements are processed, which means that the cubicweb package should always be the one from source -- instead of a released version pulled by a cube through test dependencies, which may occur in "recreate" step. .. _`develop option`: <http://tox.readthedocs.org/en/latest/config.html#confval-usedevelop=BOOL

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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