c.pagination = RepoPage(collection, page=p, item_count=c.total_cs,

                                    items_per_page=c.size, branch=branch_name)

            collection = list(c.pagination)

            page_revisions = [x.raw_id for x in collection]

            c.comments = c.rhodecode_db_repo.comments(page_revisions)

        except (RepositoryError, ChangesetDoesNotExistError, Exception), e:

            log.error(traceback.format_exc())

            h.flash(str(e), category='warning')

            return redirect(url('home'))

        self._graph(c.rhodecode_repo, collection, c.total_cs, c.size, p)

        c.branch_name = branch_name

        c.branch_filters = [('', _('All Branches'))] + \

            [(k, k) for k in c.rhodecode_repo.branches.keys()]

        return render('changelog/changelog.html')

    def changelog_details(self, cs):

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

            c.cs = c.rhodecode_repo.get_changeset(cs)

            return render('changelog/changelog_details.html')

    def _graph(self, repo, collection, repo_size, size, p):

        """

        Generates a DAG graph for mercurial

        :param repo: repo instance

        :param size: number of commits to show

        :param p: page number

        """

        if not collection:

            c.jsdata = json.dumps([])

            return

        data = []

        revs = [x.revision for x in collection]

        if repo.alias == 'git':

            for _ in revs:

                vtx = [0, 1]

                edges = [[0, 0, 1]]

                data.append(['', vtx, edges])

        elif repo.alias == 'hg':

            dag = graphmod.dagwalker(repo._repo, revs)

            for (id, type, ctx, vtx, edges) in c.dag:

                if type != graphmod.CHANGESET:

                    continue

                data.append(['', vtx, edges])

        c.jsdata = json.dumps(data)