Multilink fixes and optimizations: - Optimisation: Late evaluation of Multilinks (only in rdbms backends): previously we materialized each multilink in a Node -- this creates an SQL query for each multilink (e.g. 'files' and 'messages' for each line in the issue index display) -- even if the multilinks aren't displayed. Now we compute multilinks only if they're accessed (and keep them cached). - Add a filter_iter similar to the existing filter call. This feature is considered experimental. This is currently not used in the web-interface but passes all tests for the filter call except sorting by Multilinks (which isn't supported by SQL and isn't a sane concept anyway). When using filter_iter instead of filter this saves a *lot* of SQL queries: Filter returns only the IDs of Nodes in the database, the additional content of a Node has to be fetched in a separate SQL call. The new filter_iter also returns the IDs of Nodes (one by one, it's an iterator) but pre-seeds the cache with the content of the Node. The information needed for seeding the cache is retrieved in the same SQL query as the ids.

import unittest

from roundup.support import wrap

class WrapTestCase(unittest.TestCase):
    def testWrap(self):
        lorem = '''Lorem ipsum dolor sit amet, consectetuer adipiscing elit.'''
        wrapped = '''Lorem ipsum dolor
sit amet,
consectetuer
adipiscing elit.'''
        self.assertEquals(wrap(lorem, 20), wrapped)

def test_suite():
    suite = unittest.TestSuite()
    suite.addTest(unittest.makeSuite(WrapTestCase))
    return suite