# -*- coding: utf-8 -*-

# 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 3 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, see <http://www.gnu.org/licenses/>.

"""

kallithea.controllers.feed

~~~~~~~~~~~~~~~~~~~~~~~~~~

Feed controller for Kallithea

This file was forked by the Kallithea project in July 2014.

Original author and date, and relevant copyright and licensing information is below:

:created_on: Apr 23, 2010

:author: marcink

:copyright: (c) 2013 RhodeCode GmbH, and others.

:license: GPLv3, see LICENSE.md for more details.

"""

import logging

from pylons.i18n.translation import _

from beaker.cache import cache_region, region_invalidate

from webhelpers.feedgenerator import Atom1Feed, Rss201rev2Feed

from kallithea.lib import helpers as h

from kallithea.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator

from kallithea.lib.base import BaseRepoController

from kallithea.lib.diffs import DiffProcessor, LimitedDiffContainer

from kallithea.model.db import CacheInvalidation

from kallithea.lib.utils2 import safe_int, str2bool, safe_unicode

log = logging.getLogger(__name__)

class FeedController(BaseRepoController):

    @LoginRequired(api_access=True)

    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',

                                   'repository.admin')

    def __before__(self):

        super(FeedController, self).__before__()

        #common values for feeds

        self.description = _('Changes on %s repository')

        self.title = self.title = _('%s %s feed') % (c.site_name, '%s')

        self.language = 'en-us'

        self.ttl = "5"

        import kallithea

        CONF = kallithea.CONFIG

        self.include_diff = str2bool(CONF.get('rss_include_diff', False))

        self.feed_nr = safe_int(CONF.get('rss_items_per_page', 20))

        # we need to protect from parsing huge diffs here other way

        # we can kill the server

        self.feed_diff_limit = safe_int(CONF.get('rss_cut_off_limit', 32 * 1024))

    def _get_title(self, cs):

        return "%s" % (

            h.shorter(cs.message, 160)

        )

    def __changes(self, cs):

        changes = []

        diff_processor = DiffProcessor(cs.diff(),

                                       diff_limit=self.feed_diff_limit)

        _parsed = diff_processor.prepare(inline_diff=False)

        limited_diff = False

        if isinstance(_parsed, LimitedDiffContainer):

            limited_diff = True

        for st in _parsed:

            st.update({'added': st['stats']['added'],

                       'removed': st['stats']['deleted']})

            changes.append('\n %(operation)s %(filename)s '

                           '(%(added)s lines added, %(removed)s lines removed)'

                            % st)

        if limited_diff:

            changes = changes + ['\n ' +

                                 _('Changeset was too big and was cut off...')]

        return diff_processor, changes

    def __get_desc(self, cs):

        desc_msg = [(_('%s committed on %s')

                     % (h.person(cs.author), h.fmt_date(cs.date))) + '<br/>']

        #branches, tags, bookmarks

        if cs.branch:

            desc_msg.append('branch: %s<br/>' % cs.branch)

        if h.is_hg(c.db_repo_scm_instance):

            for book in cs.bookmarks:

                desc_msg.append('bookmark: %s<br/>' % book)

        for tag in cs.tags:

            desc_msg.append('tag: %s<br/>' % tag)

        diff_processor, changes = self.__changes(cs)

        # rev link

        desc_msg.append('changeset: <a href="%s">%s</a>' % (_url, cs.raw_id[:8]))

        desc_msg.append('<pre>')

        desc_msg.append(cs.message)

        desc_msg.append('\n')

        desc_msg.extend(changes)

        if self.include_diff:

            desc_msg.append('\n\n')

            desc_msg.append(diff_processor.as_raw())

        desc_msg.append('</pre>')

        return map(safe_unicode, desc_msg)

    def atom(self, repo_name):

        """Produce an atom-1.0 feed via feedgenerator module"""

        @cache_region('long_term')

        def _get_feed_from_cache(key, kind):

            feed = Atom1Feed(

                 title=self.title % repo_name,

                 description=self.description % repo_name,

                 language=self.language,

                 ttl=self.ttl

            )

            for cs in reversed(list(c.db_repo_scm_instance[-self.feed_nr:])):

                feed.add_item(title=self._get_title(cs),

                              author_name=cs.author,

                              description=''.join(self.__get_desc(cs)),

                              pubdate=cs.date,

                              )

            response.content_type = feed.mime_type

            return feed.writeString('utf-8')

        kind = 'ATOM'

        valid = CacheInvalidation.test_and_set_valid(repo_name, kind)

        if not valid:

            region_invalidate(_get_feed_from_cache, None, repo_name, kind)

        return _get_feed_from_cache(repo_name, kind)

    def rss(self, repo_name):

        """Produce an rss2 feed via feedgenerator module"""

        @cache_region('long_term')

        def _get_feed_from_cache(key, kind):

            feed = Rss201rev2Feed(

                title=self.title % repo_name,

                description=self.description % repo_name,

                language=self.language,

                ttl=self.ttl

            )

            for cs in reversed(list(c.db_repo_scm_instance[-self.feed_nr:])):

                feed.add_item(title=self._get_title(cs),

                              author_name=cs.author,

                              description=''.join(self.__get_desc(cs)),

                              pubdate=cs.date,

                             )

            response.content_type = feed.mime_type

            return feed.writeString('utf-8')

        kind = 'RSS'

        valid = CacheInvalidation.test_and_set_valid(repo_name, kind)

        if not valid:

            region_invalidate(_get_feed_from_cache, None, repo_name, kind)

        return _get_feed_from_cache(repo_name, kind)

# -*- coding: utf-8 -*-

# 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 3 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, see <http://www.gnu.org/licenses/>.

"""

kallithea.controllers.journal

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Journal controller for pylons

This file was forked by the Kallithea project in July 2014.

Original author and date, and relevant copyright and licensing information is below:

:created_on: Nov 21, 2010

:author: marcink

:copyright: (c) 2013 RhodeCode GmbH, and others.

:license: GPLv3, see LICENSE.md for more details.

"""

import logging

from itertools import groupby

from sqlalchemy import or_

from sqlalchemy.orm import joinedload

from sqlalchemy.sql.expression import func

from webhelpers.feedgenerator import Atom1Feed, Rss201rev2Feed

from webob.exc import HTTPBadRequest

from pylons import request, tmpl_context as c, response, url

from pylons.i18n.translation import _

from kallithea.controllers.admin.admin import _journal_filter

from kallithea.model.db import UserLog, UserFollowing, Repository, User

from kallithea.model.meta import Session

from kallithea.model.repo import RepoModel

import kallithea.lib.helpers as h

from kallithea.lib.helpers import Page

from kallithea.lib.auth import LoginRequired, NotAnonymous

from kallithea.lib.base import BaseController, render

from kallithea.lib.utils2 import safe_int, AttributeDict

from kallithea.lib.compat import json

log = logging.getLogger(__name__)

class JournalController(BaseController):

    def __before__(self):

        super(JournalController, self).__before__()

        self.language = 'en-us'

        self.ttl = "5"

        self.feed_nr = 20

        c.search_term = request.GET.get('filter')

    def _get_daily_aggregate(self, journal):

        groups = []

        for k, g in groupby(journal, lambda x: x.action_as_day):

            user_group = []

            #groupby username if it's a present value, else fallback to journal username

            for _unused, g2 in groupby(list(g), lambda x: x.user.username if x.user else x.username):

                l = list(g2)

                user_group.append((l[0].user, l))

            groups.append((k, user_group,))

        return groups

    def _get_journal_data(self, following_repos):

        repo_ids = [x.follows_repository.repo_id for x in following_repos

                    if x.follows_repository is not None]

        user_ids = [x.follows_user.user_id for x in following_repos

                    if x.follows_user is not None]

        filtering_criterion = None

        if repo_ids and user_ids:

            filtering_criterion = or_(UserLog.repository_id.in_(repo_ids),

                        UserLog.user_id.in_(user_ids))

        if repo_ids and not user_ids:

            filtering_criterion = UserLog.repository_id.in_(repo_ids)

        if not repo_ids and user_ids:

            filtering_criterion = UserLog.user_id.in_(user_ids)

        if filtering_criterion is not None:

            journal = self.sa.query(UserLog)\

                .options(joinedload(UserLog.user))\

                .options(joinedload(UserLog.repository))

            #filter

            try:

                journal = _journal_filter(journal, c.search_term)

            except Exception:

                # we want this to crash for now

                raise

            journal = journal.filter(filtering_criterion)\

                        .order_by(UserLog.action_date.desc())

        else:

            journal = []

        return journal

    def _atom_feed(self, repos, public=True):

        journal = self._get_journal_data(repos)

        if public:

            _desc = '%s %s %s' % (c.site_name, _('public journal'),

                                  'atom feed')

        else:

            _desc = '%s %s %s' % (c.site_name, _('journal'), 'atom feed')

        feed = Atom1Feed(title=_desc,

                         link=_link,

                         description=_desc,

                         language=self.language,

                         ttl=self.ttl)

        for entry in journal[:self.feed_nr]:

            user = entry.user

            if user is None:

                #fix deleted users

                user = AttributeDict({'short_contact': entry.username,

                                      'email': '',

                                      'full_contact': ''})

            action, action_extra, ico = h.action_parser(entry, feed=True)

            title = "%s - %s %s" % (user.short_contact, action(),

                                    entry.repository.repo_name)

            desc = action_extra()

            _url = None

            if entry.repository is not None:

            feed.add_item(title=title,

                          pubdate=entry.action_date,

                          author_email=user.email,

                          author_name=user.full_contact,

                          description=desc)

        response.content_type = feed.mime_type

        return feed.writeString('utf-8')

    def _rss_feed(self, repos, public=True):

        journal = self._get_journal_data(repos)

        if public:

            _desc = '%s %s %s' % (c.site_name, _('public journal'),

                                  'rss feed')

        else:

            _desc = '%s %s %s' % (c.site_name, _('journal'), 'rss feed')

        feed = Rss201rev2Feed(title=_desc,

                         link=_link,

                         description=_desc,

                         language=self.language,

                         ttl=self.ttl)

        for entry in journal[:self.feed_nr]:

            user = entry.user

            if user is None:

                #fix deleted users

                user = AttributeDict({'short_contact': entry.username,

                                      'email': '',

                                      'full_contact': ''})

            action, action_extra, ico = h.action_parser(entry, feed=True)

            title = "%s - %s %s" % (user.short_contact, action(),

                                    entry.repository.repo_name)

            desc = action_extra()

            _url = None

            if entry.repository is not None:

            feed.add_item(title=title,

                          pubdate=entry.action_date,

                          author_email=user.email,

                          author_name=user.full_contact,

                          description=desc)

        response.content_type = feed.mime_type

        return feed.writeString('utf-8')

    @LoginRequired()

    @NotAnonymous()

    def index(self):

        # Return a rendered template

        p = safe_int(request.GET.get('page', 1), 1)

        c.user = User.get(self.authuser.user_id)

        c.following = self.sa.query(UserFollowing)\

            .filter(UserFollowing.user_id == self.authuser.user_id)\

            .options(joinedload(UserFollowing.follows_repository))\

            .all()

        journal = self._get_journal_data(c.following)

        def url_generator(**kw):

            return url.current(filter=c.search_term, **kw)

        c.journal_pager = Page(journal, page=p, items_per_page=20, url=url_generator)

        c.journal_day_aggreagate = self._get_daily_aggregate(c.journal_pager)

        c.journal_data = render('journal/journal_data.html')

        if request.environ.get('HTTP_X_PARTIAL_XHR'):

            return c.journal_data

        repos_list = Session().query(Repository)\

                     .filter(Repository.user_id ==

                             self.authuser.user_id)\

                     .order_by(func.lower(Repository.repo_name)).all()

        repos_data = RepoModel().get_repos_as_dict(repos_list=repos_list,

                                                   admin=True)

        #json used to render the grid

        c.data = json.dumps(repos_data)

        watched_repos_data = []

        ## watched repos

        _render = RepoModel._render_datatable

        def quick_menu(repo_name):

            return _render('quick_menu', repo_name)

        def repo_lnk(name, rtype, rstate, private, fork_of):

            return _render('repo_name', name, rtype, rstate, private, fork_of,

                           short_name=False, admin=False)

        def last_rev(repo_name, cs_cache):

            return _render('revision', repo_name, cs_cache.get('revision'),

                           cs_cache.get('raw_id'), cs_cache.get('author'),

                           cs_cache.get('message'))

        def desc(desc):

            from pylons import tmpl_context as c

            if c.visual.stylify_metatags:

                return h.urlify_text(h.desc_stylize(h.truncate(desc, 60)))

            else:

                return h.urlify_text(h.truncate(desc, 60))

        def repo_actions(repo_name):

            return _render('repo_actions', repo_name)

        def owner_actions(user_id, username):

            return _render('user_name', user_id, username)

        def toogle_follow(repo_id):

            return  _render('toggle_follow', repo_id)

        for entry in c.following:

            repo = entry.follows_repository

            cs_cache = repo.changeset_cache

            row = {

                "menu": quick_menu(repo.repo_name),

                "raw_name": repo.repo_name.lower(),

                "name": repo_lnk(repo.repo_name, repo.repo_type,

                                 repo.repo_state, repo.private, repo.fork),

                "last_changeset": last_rev(repo.repo_name, cs_cache),

                "last_rev_raw": cs_cache.get('revision'),

                "action": toogle_follow(repo.repo_id)

            }

            watched_repos_data.append(row)

        c.watched_data = json.dumps({

            "totalRecords": len(c.following),

            "startIndex": 0,

            "sort": "name",

            "dir": "asc",

            "records": watched_repos_data

        })

        return render('journal/journal.html')

    @LoginRequired(api_access=True)

    @NotAnonymous()

    def journal_atom(self):

        """

        Produce an atom-1.0 feed via feedgenerator module

        """

        following = self.sa.query(UserFollowing)\

            .filter(UserFollowing.user_id == self.authuser.user_id)\

            .options(joinedload(UserFollowing.follows_repository))\

            .all()

        return self._atom_feed(following, public=False)

    @LoginRequired(api_access=True)

    @NotAnonymous()

    def journal_rss(self):

        """

        Produce an rss feed via feedgenerator module

        """

        following = self.sa.query(UserFollowing)\

            .filter(UserFollowing.user_id == self.authuser.user_id)\

            .options(joinedload(UserFollowing.follows_repository))\

            .all()

        return self._rss_feed(following, public=False)

    @LoginRequired()

    @NotAnonymous()

    def toggle_following(self):

        cur_token = request.POST.get('auth_token')

        token = h.get_token()

        if cur_token == token:

            user_id = request.POST.get('follows_user_id')

            if user_id:

                try:

                    self.scm_model.toggle_following_user(user_id,

                                                self.authuser.user_id)

                    Session.commit()

                    return 'ok'

                except Exception:

                    raise HTTPBadRequest()

            repo_id = request.POST.get('follows_repo_id')

            if repo_id:

                try:

                    self.scm_model.toggle_following_repo(repo_id,

                                                self.authuser.user_id)

                    Session.commit()

                    return 'ok'

                except Exception:

                    raise HTTPBadRequest()

        log.debug('token mismatch %s vs %s' % (cur_token, token))

        raise HTTPBadRequest()

    @LoginRequired()

    def public_journal(self):

        # Return a rendered template

        p = safe_int(request.GET.get('page', 1), 1)

        c.following = self.sa.query(UserFollowing)\

            .filter(UserFollowing.user_id == self.authuser.user_id)\

            .options(joinedload(UserFollowing.follows_repository))\

            .all()

        journal = self._get_journal_data(c.following)

        c.journal_pager = Page(journal, page=p, items_per_page=20)

        c.journal_day_aggreagate = self._get_daily_aggregate(c.journal_pager)

        c.journal_data = render('journal/journal_data.html')

        if request.environ.get('HTTP_X_PARTIAL_XHR'):

            return c.journal_data

        return render('journal/public_journal.html')

    @LoginRequired(api_access=True)

    def public_journal_atom(self):

        """

        Produce an atom-1.0 feed via feedgenerator module

        """

        c.following = self.sa.query(UserFollowing)\

            .filter(UserFollowing.user_id == self.authuser.user_id)\

            .options(joinedload(UserFollowing.follows_repository))\

            .all()

        return self._atom_feed(c.following)

    @LoginRequired(api_access=True)

    def public_journal_rss(self):

        """

        Produce an rss2 feed via feedgenerator module

        """

        c.following = self.sa.query(UserFollowing)\

            .filter(UserFollowing.user_id == self.authuser.user_id)\

            .options(joinedload(UserFollowing.follows_repository))\

        return render('/pullrequests/pullrequest_show_all.html')

    @LoginRequired()

    def show_my(self): # my_account_my_pullrequests

        c.show_closed = request.GET.get('pr_show_closed')

        return render('/pullrequests/pullrequest_show_my.html')

    @NotAnonymous()

    def show_my_data(self):

        c.show_closed = request.GET.get('pr_show_closed')

        def _filter(pr):

            s = sorted(pr, key=lambda o: o.created_on, reverse=True)

            if not c.show_closed:

                s = filter(lambda p: p.status != PullRequest.STATUS_CLOSED, s)

            return s

        c.my_pull_requests = _filter(PullRequest.query()\

                                .filter(PullRequest.user_id ==

                                        self.authuser.user_id)\

                                .all())

        c.participate_in_pull_requests = _filter(PullRequest.query()\

                                .join(PullRequestReviewers)\

                                .filter(PullRequestReviewers.user_id ==

                                        self.authuser.user_id)\

                                                 )

        return render('/pullrequests/pullrequest_show_my_data.html')

    @LoginRequired()

    @NotAnonymous()

    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',

                                   'repository.admin')

    def index(self):

        org_repo = c.db_repo

        try:

            org_repo.scm_instance.get_changeset()

        except EmptyRepositoryError, e:

            h.flash(h.literal(_('There are no changesets yet')),

                    category='warning')

            redirect(url('summary_home', repo_name=org_repo.repo_name))

        org_rev = request.GET.get('rev_end')

        # rev_start is not directly useful - its parent could however be used

        # as default for other and thus give a simple compare view

        #other_rev = request.POST.get('rev_start')

        branch = request.GET.get('branch')

        c.org_repos = []

        c.org_repos.append((org_repo.repo_name, org_repo.repo_name))

        c.default_org_repo = org_repo.repo_name

        c.org_refs, c.default_org_ref = self._get_repo_refs(org_repo.scm_instance, rev=org_rev, branch=branch)

        c.other_repos = []

        other_repos_info = {}

        def add_other_repo(repo, branch_rev=None):

            if repo.repo_name in other_repos_info: # shouldn't happen

                return

            c.other_repos.append((repo.repo_name, repo.repo_name))

            other_refs, selected_other_ref = self._get_repo_refs(repo.scm_instance, branch_rev=branch_rev)

            other_repos_info[repo.repo_name] = {

                'user': dict(user_id=repo.user.user_id,

                             username=repo.user.username,

                             firstname=repo.user.firstname,

                             lastname=repo.user.lastname,

                             gravatar_link=h.gravatar_url(repo.user.email, 14)),

                'description': repo.description.split('\n', 1)[0],

                'revs': h.select('other_ref', selected_other_ref, other_refs, class_='refs')

            }

        # add org repo to other so we can open pull request against peer branches on itself

        add_other_repo(org_repo, branch_rev=org_rev)

        c.default_other_repo = org_repo.repo_name

        # gather forks and add to this list ... even though it is rare to

        # request forks to pull from their parent

        for fork in org_repo.forks:

            add_other_repo(fork)

        # add parents of this fork also, but only if it's not empty

        if org_repo.parent and org_repo.parent.scm_instance.revisions:

            add_other_repo(org_repo.parent)

            c.default_other_repo = org_repo.parent.repo_name

        c.default_other_repo_info = other_repos_info[c.default_other_repo]

        c.other_repos_info = json.dumps(other_repos_info)

        return render('/pullrequests/pullrequest.html')

    @LoginRequired()

    @NotAnonymous()

    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',

                                   'repository.admin')

    def create(self, repo_name):

        repo = RepoModel()._get_repo(repo_name)

        try:

            _form = PullRequestForm(repo.repo_id)().to_python(request.POST)

        except formencode.Invalid, errors:

            log.error(traceback.format_exc())

            log.error(str(errors))

            msg = _('Error creating pull request: %s') % errors.msg

            h.flash(msg, 'error')

            raise HTTPBadRequest

        # heads up: org and other might seem backward here ...

        org_repo_name = _form['org_repo']

        org_ref = _form['org_ref'] # will have merge_rev as rev but symbolic name

        org_repo = RepoModel()._get_repo(org_repo_name)

        (org_ref_type,

         org_ref_name,

         org_rev) = org_ref.split(':')

        other_repo_name = _form['other_repo']

        other_ref = _form['other_ref'] # will have symbolic name and head revision

        other_repo = RepoModel()._get_repo(other_repo_name)

        (other_ref_type,

         other_ref_name,

         other_rev) = other_ref.split(':')

        cs_ranges, _cs_ranges_not, ancestor_rev = \

            CompareController._get_changesets(org_repo.scm_instance.alias,

                                              other_repo.scm_instance, other_rev, # org and other "swapped"

                                              org_repo.scm_instance, org_rev,

                                              )

        revisions = [cs.raw_id for cs in cs_ranges]

        # hack: ancestor_rev is not an other_rev but we want to show the

        # requested destination and have the exact ancestor

        other_ref = '%s:%s:%s' % (other_ref_type, other_ref_name, ancestor_rev)

        reviewers = _form['review_members']

        title = _form['pullrequest_title']

        if not title:

            title = '%s#%s to %s#%s' % (org_repo_name, h.short_ref(org_ref_type, org_ref_name),

                                        other_repo_name, h.short_ref(other_ref_type, other_ref_name))

        description = _form['pullrequest_desc'].strip() or _('No description')

        try:

            pull_request = PullRequestModel().create(

                self.authuser.user_id, org_repo_name, org_ref, other_repo_name,

                other_ref, revisions, reviewers, title, description

            )

            Session().commit()

            h.flash(_('Successfully opened new pull request'),

                    category='success')

        except Exception:

            h.flash(_('Error occurred while creating pull request'),

                    category='error')

            log.error(traceback.format_exc())

            return redirect(url('pullrequest_home', repo_name=repo_name))

        return redirect(url('pullrequest_show', repo_name=other_repo_name,

                            pull_request_id=pull_request.pull_request_id))

    @LoginRequired()

    @NotAnonymous()

    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',

                                   'repository.admin')

    def copy_update(self, repo_name, pull_request_id):

        old_pull_request = PullRequest.get_or_404(pull_request_id)

        assert old_pull_request.other_repo.repo_name == repo_name

        if old_pull_request.is_closed():

            raise HTTPForbidden()

        org_repo = RepoModel()._get_repo(old_pull_request.org_repo.repo_name)

        org_ref_type, org_ref_name, org_rev = old_pull_request.org_ref.split(':')

        updaterev = request.POST.get('updaterev')

        if updaterev:

            new_org_rev = self._get_ref_rev(org_repo, 'rev', updaterev)

        else:

            # assert org_ref_type == 'branch', org_ref_type # TODO: what if not?

            new_org_rev = self._get_ref_rev(org_repo, org_ref_type, org_ref_name)

        other_repo = RepoModel()._get_repo(old_pull_request.other_repo.repo_name)

        other_ref_type, other_ref_name, other_rev = old_pull_request.other_ref.split(':') # other_rev is ancestor

        #assert other_ref_type == 'branch', other_ref_type # TODO: what if not?

        new_other_rev = self._get_ref_rev(other_repo, other_ref_type, other_ref_name)

        cs_ranges, _cs_ranges_not, ancestor_rev = CompareController._get_changesets(org_repo.scm_instance.alias,

            other_repo.scm_instance, new_other_rev, # org and other "swapped"

            org_repo.scm_instance, new_org_rev)

        old_revisions = set(old_pull_request.revisions)

        revisions = [cs.raw_id for cs in cs_ranges]

        new_revisions = [r for r in revisions if r not in old_revisions]

        lost = old_revisions.difference(revisions)

        infos = ['','', 'This is an update of %s "%s".' %

                  old_pull_request.title)]

        if lost:

            infos.append(_('Missing changesets since the previous version:'))

            for r in old_pull_request.revisions:

                if r in lost:

                    desc = org_repo.get_changeset(r).message.split('\n')[0]

                    infos.append('  %s "%s"' % (h.short_id(r), desc))

        if new_revisions:

            infos.append(_('New changesets on %s %s since the previous version:') % (org_ref_type, org_ref_name))

            for r in reversed(revisions):

                if r in new_revisions:

                    desc = org_repo.get_changeset(r).message.split('\n')[0]

                    infos.append('  %s "%s"' % (h.short_id(r), desc))

            if ancestor_rev == other_rev:

                infos.append(_("Ancestor didn't change - show diff since previous version: %s .") %

                                 repo_name=org_repo.repo_name, # other_repo is always same as repo_name

                                 org_ref_type='rev', org_ref_name=h.short_id(org_rev), # use old org_rev as base

                                 other_ref_type='rev', other_ref_name=h.short_id(new_org_rev),

            else:

                infos.append(_('This pull request uses another merge ancestor than the previous version and they are not directly comparable.'))

        else:

           infos.append(_('No changes found on %s %s since previous version.') % (org_ref_type, org_ref_name))

           # TODO: fail?

        # hack: ancestor_rev is not an other_ref but we want to show the

        # requested destination and have the exact ancestor

        new_other_ref = '%s:%s:%s' % (other_ref_type, other_ref_name, ancestor_rev)

        new_org_ref = '%s:%s:%s' % (org_ref_type, org_ref_name, new_org_rev)

        reviewers = [r.user_id for r in old_pull_request.reviewers]

        try:

            old_title, old_v = re.match(r'(.*)\(v(\d+)\)\s*$', old_pull_request.title).groups()

            v = int(old_v) + 1

        except (AttributeError, ValueError):

            old_title = old_pull_request.title

            v = 2

        title = '%s (v%s)' % (old_title.strip(), v)

        description = (old_pull_request.description.rstrip() +

                       '\n'.join(infos))

        try:

            pull_request = PullRequestModel().create(

                self.authuser.user_id,

                old_pull_request.org_repo.repo_name, new_org_ref,

                old_pull_request.other_repo.repo_name, new_other_ref,

                revisions, reviewers, title, description

            )

        except Exception:

            h.flash(_('Error occurred while creating pull request'),

                    category='error')

            log.error(traceback.format_exc())

            return redirect(url('pullrequest_show', repo_name=repo_name,

                                pull_request_id=pull_request_id))

        ChangesetCommentsModel().create(

                                                   repo_name=old_pull_request.other_repo.repo_name,

            repo=old_pull_request.other_repo.repo_id,

            user=c.authuser.user_id,

            pull_request=pull_request_id,

            closing_pr=True)

        PullRequestModel().close_pull_request(pull_request_id)

        Session().commit()

        h.flash(_('Pull request update created'),