~loggerhead-team/loggerhead/experimental

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# Copyright (C) 2008-2011 Canonical Ltd.
#                     (Authored by Martin Albisetti <argentina@gmail.com>)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

from cStringIO import StringIO
import logging
import time

from paste.request import path_info_pop

from bzrlib.diff import show_diff_trees

from loggerhead.controllers import TemplatedBranchView


class DiffUI(TemplatedBranchView):
    """Class to output a diff for a single file or revisions."""

    def __call__(self, environ, start_response):
        # /diff/<rev_id>/<rev_id>
        """Default method called from /diff URL."""
        z = time.time()

        args = []
        while True:
            arg = path_info_pop(environ)
            if arg is None:
                break
            args.append(arg)

        revid_from = args[0]
        # Convert a revno to a revid if we get a revno
        revid_from = self._history.fix_revid(revid_from)
        change = self._history.get_changes([revid_from])[0]

        if len(args) is 2:
            revid_to = self._history.fix_revid(args[1])
        else:
            revid_to = change.parents[0].revid

        repo = self._branch.branch.repository
        revtree1 = repo.revision_tree(revid_to)
        revtree2 = repo.revision_tree(revid_from)

        diff_content_stream = StringIO()
        show_diff_trees(revtree1, revtree2, diff_content_stream,
                        old_label='', new_label='')

        content = diff_content_stream.getvalue()

        self.log.info('/diff %r:%r in %r secs' % (revid_from, revid_to,
                                                  time.time() - z))

        revno1 = self._history.get_revno(revid_from)
        revno2 = self._history.get_revno(revid_to)
        filename = '%s_%s.diff' % (revno1, revno2)
        headers = [
            ('Content-Type', 'application/octet-stream'),
            ('Content-Length', str(len(content))),
            ('Content-Disposition', 'attachment; filename=%s' % (filename,)),
            ]
        start_response('200 OK', headers)
        return [content]