The following will download the messages spool for an issue as an mbox file. It's intended to be dropped into the extensions directory of a 0.8 or later tracker. It'll work with 0.7, but the registration interface has changed (the init bit at the end is 0.8-or-later).

The code:

    from roundup.cgi.actions import Action

    class MboxAction(Action):
        def handle(self):
            if self.classname != 'issue':
                raise ValueError, 'Can only download messages mbox for issues'
            if self.nodeid is None:
                raise ValueError, 'Can only download messages mbox for single issues'

            r = []
            a = r.append
            msg = self.db.msg
            user = self.db.user
            for msgid in self.db.issue.get(self.nodeid, 'messages'):
                author = msg.get(msgid, 'author')
                date = msg.get(msgid, 'date')
                sdate = date.pretty('%a, %d %b %Y %H:%M:%S +0000')
                a('From %s %s'%(user.get(author, 'address'), sdate))
                a('From: %s'%user.get(author, 'address'))
                a('Message-Id: %s'%msg.get(msgid, 'messageid'))
                inreplyto = msg.get(msgid, 'inreplyto')
                if inreplyto:
                    a('In-Reply-To: %s'%inreplyto)
                body = msg.get(msgid, 'content').splitlines()
                for line in range(len(body)):
                    if body[line].startswith('From '):
                        body[line] = '>'+body['line']
                    a(body[line])
                a('\n')

            h = self.client.additional_headers
            h['Content-Type'] = 'application/mbox'

            self.client.header()
            if self.client.env['REQUEST_METHOD'] == 'HEAD':
                # all done, return a dummy string
                return 'dummy'

            return '\n'.join(r)

    def init(tracker):
        tracker.registerAction('mbox', MboxAction)

-- RichardJones

comments:

The usage bit --wiki, Sat, 29 Jul 2006 11:12:31 +1000 reply
To use it, I created a link: Download (should work fine in the issue.item.html template)

... --wiki, Sat, 29 Jul 2006 11:14:43 +1000 reply
One more try: <a href="#" tal:attributes="href string:issue${context/id}?@action=mbox" i18n:translate="">Download</a>