bug: fix replacement for param writer_name -> writer correctly. Use the html4css1 writer for now. If you use the html5_polyglot you end up with: <main> processed rst </main> rather than (html4css1 writer's): <div class="document"> processed rst </div> there can only be one <main> per document. Each message must not be inside a <main> tag. I could string munge the main tag to a div. But that's ugly. The correct way is to subclass html5_polyglot and override the HTMLTrnslator::documenttag_args replacing {'tagname': 'main'} with {'tagname': 'div', "CLASS": "document"} or something similar. That's a change for another time.

from roundup.mailgw import parseContent

def summarygenerator(db, cl, nodeid, newvalues):
    ''' If the message doesn't have a summary, make one for it.
    '''
    if 'summary' in newvalues or 'content' not in newvalues:
        return

    summary, content = parseContent(newvalues['content'], config=db.config)
    newvalues['summary'] = summary


def init(db):
    # fire before changes are made
    db.msg.audit('create', summarygenerator)

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#SHA: 538f90cb7f4eb63f77eca252b87afbe037d29c48