def index(self, repo_name):

        c.compare_home = True

        c.a_ref_name = c.cs_ref_name = _('Select changeset')

        return render('compare/compare_diff.html')

    @LoginRequired()

    @HasRepoPermissionLevelDecorator('read')

    def compare(self, repo_name, org_ref_type, org_ref_name, other_ref_type, other_ref_name):

        org_ref_name = org_ref_name.strip()

        other_ref_name = other_ref_name.strip()

        # If merge is True:

        #   Show what org would get if merged with other:

        #   List changesets that are ancestors of other but not of org.

        #   New changesets in org is thus ignored.

        #   Diff will be from common ancestor, and merges of org to other will thus be ignored.

        # If merge is False:

        #   Make a raw diff from org to other, no matter if related or not.

        #   Changesets in one and not in the other will be ignored

        merge = bool(request.GET.get('merge'))

        # fulldiff disables cut_off_limit

        c.fulldiff = request.GET.get('fulldiff')

        # partial uses compare_cs.html template directly

        partial = request.environ.get('HTTP_X_PARTIAL_XHR')

        c.swap_url = h.url('compare_url',

            repo_name=c.cs_repo.repo_name,

            org_ref_type=other_ref_type, org_ref_name=other_ref_name,

            other_repo=c.a_repo.repo_name,

            other_ref_type=org_ref_type, other_ref_name=org_ref_name,

            merge=merge or '')

        # set callbacks for generating markup for icons

        c.ignorews_url = _ignorews_url

        c.context_url = _context_url

        ignore_whitespace = request.GET.get('ignorews') == '1'

        line_context = safe_int(request.GET.get('context'), 3)

        c.a_rev = self._get_ref_rev(c.a_repo, org_ref_type, org_ref_name,

            returnempty=True)

        c.cs_rev = self._get_ref_rev(c.cs_repo, other_ref_type, other_ref_name)

        c.compare_home = False

        c.a_ref_name = org_ref_name

        c.a_ref_type = org_ref_type

        c.cs_ref_name = other_ref_name

        c.cs_ref_type = other_ref_type

        c.cs_ranges, c.cs_ranges_org, c.ancestors = self._get_changesets(

            diff = diff_processor.as_html(enable_comments=True,

                                          parsed_lines=[f])

            c.file_diff_data.append((fid, None, f['operation'], f['old_filename'], filename, diff, st))

        # inline comments

        c.inline_cnt = 0

        c.inline_comments = cc_model.get_inline_comments(

                                c.db_repo.repo_id,

                                pull_request=pull_request_id)

        # count inline comments

        for __, lines in c.inline_comments:

            for comments in lines.values():

                c.inline_cnt += len(comments)

        # comments

        c.comments = cc_model.get_comments(c.db_repo.repo_id,

                                           pull_request=pull_request_id)

        # (badly named) pull-request status calculation based on reviewer votes

        (c.pull_request_reviewers,

         c.pull_request_pending_reviewers,

         c.current_voting_result,

         ) = cs_model.calculate_pull_request_result(c.pull_request)

        c.changeset_statuses = ChangesetStatus.STATUSES

        c.ancestors = None # [c.a_rev] ... but that is shown in an other way

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

    @LoginRequired()

    @NotAnonymous()

    @HasRepoPermissionLevelDecorator('read')

    @jsonify

    def comment(self, repo_name, pull_request_id):

        pull_request = PullRequest.get_or_404(pull_request_id)

        status = request.POST.get('changeset_status')

        close_pr = request.POST.get('save_close')

        delete = request.POST.get('save_delete')

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

        line_no = request.POST.get('line')

        if (status or close_pr or delete) and (f_path or line_no):

            # status votes and closing is only possible in general comments

            raise HTTPBadRequest()

        allowed_to_change_status = self._get_is_allowed_change_status(pull_request)

        if not allowed_to_change_status:

            if status or close_pr:

                h.flash(_('No permission to change pull request status'), 'error')

        <td>

        %if cs.branch:

        <span class="branchtag">${h.link_to(cs.branch,h.url('changelog_home',repo_name=c.cs_repo.repo_name,branch=cs.branch))}</span>

        %endif

        </td>

        <td class="expand_commit" data-commit_id="${cs.raw_id}" title="${_('Expand commit message')}">

            <i class="icon-align-left" style="color:#999"></i>

        </td>

        <td>

            <div class="pull-right" style="margin-top: -4px;">

                %for tag in cs.tags:

                    <span class="tagtag" title="${_('Tag %s') % tag}">

                        ${h.link_to(tag,h.url('changeset_home',repo_name=c.repo_name,revision=cs.raw_id))}

                    </span>

                %endfor

            </div>

            <div id="C-${cs.raw_id}" class="message">${h.urlify_text(cs.message, c.repo_name)}</div>

        </td>

      </tr>

    %endfor

    </table>

    </div>

      <h5>

      ## links should perhaps use ('rev', c.a_rev) instead ...

      ${h.link_to(_('Show merge diff'),

        h.url('compare_url',

          repo_name=c.a_repo.repo_name,

          org_ref_type=c.a_ref_type, org_ref_name=c.a_ref_name,

          other_repo=c.cs_repo.repo_name,

          other_ref_type=c.cs_ref_type, other_ref_name=c.cs_ref_name,

          merge='1')

        )}

      </h5>

    %endif

    %if c.cs_ranges_org is not None:

      ## TODO: list actual changesets?

      <div style="font-size:1.1em;font-weight: bold;clear:both;padding-top:10px">

        ${h.link_to_ref(c.cs_repo.repo_name, c.cs_ref_type, c.cs_ref_name, c.cs_rev)}

        ${_('is')}

        <a href="${c.swap_url}">${_('%s changesets') % (len(c.cs_ranges_org))}</a>

        ${_('behind')}

        ${h.link_to_ref(c.a_repo.repo_name, c.a_ref_type, c.a_ref_name)}

      </div>

    %endif

  %endif

</div>

<div id="jsdata" style="display:none">${h.js(c.jsdata)}</div>

%else:

<script type="text/javascript" src="${h.url('/js/graph.js', ver=c.kallithea_version)}"></script>

%endif

<script type="text/javascript">

    $(document).ready(function(){

        var jsdata = ${h.js(c.jsdata)};

        var r = new BranchRenderer('graph_canvas', 'graph_content_pr', 'chg_');

        r.render(jsdata);

%endif

        $('.expand_commit').click(function(e){

            var cid = $(this).data('commit_id');

            $('#C-'+cid).toggleClass('expanded');

            r.render(jsdata);

        });

        $('.gravatar').click(function(e){

            var cid = $(this).data('commit_id');

            $('#row-'+cid).toggleClass('hl', !$('#row-'+cid).hasClass('hl'));

        });

    });

</script>

                }

                $other_ref.append($optgroup);

              }

              $other_ref.val(data.selected_ref);

              // re-populate the select2 thingy

              $("#other_ref").select2({

                  dropdownAutoWidth: true

              });

              $other_ref.prop('disabled', false);

              loadPreview();

          });

  };

  var loadPreview = function(){

      //url template

      var url = ${h.js(h.url('compare_url',

                         repo_name='__other_repo__',

                         org_ref_type='rev',

                         org_ref_name='__other_ref_name__',

                         other_repo='__org_repo__',

                         other_ref_type='rev',

                         other_ref_name='__org_ref_name__',

                         merge=True,

                         ))};

      var org_repo = $('#pull_request_form #org_repo').val();

      var org_ref = $('#pull_request_form #org_ref').val().split(':');

      ## TODO: make nice link like link_to_ref() do

      $('#org_rev_span').html(org_ref[2].substr(0,12));

      var other_repo = $('#pull_request_form #other_repo').val();

      var other_ref = $('#pull_request_form #other_ref').val().split(':');

      $('#other_rev_span').html(other_ref[2].substr(0,12));

      var rev_data = {

          '__org_repo__': org_repo,

          '__org_ref_name__': org_ref[2],

          '__other_repo__': other_repo,

          '__other_ref_name__': other_ref[2]

      }; // gather the org/other ref and repo here

      for (k in rev_data){

          url = url.replace(k,rev_data[k]);

      }

      if (pendingajax) {

          pendingajax.abort();

        response.mustcontain("""<a href="#C--c8e92ef85cd1">.hgignore</a>""")

    def test_compare_revisions_git(self):

        self.log_user()

        rev1 = 'c1214f7e79e02fc37156ff215cd71275450cffc3'

        rev2 = '38b5fe81f109cb111f549bfe9bb6b267e10bc557'

        response = self.app.get(url('compare_url',

                                    repo_name=GIT_REPO,

                                    org_ref_type="rev",

                                    org_ref_name=rev1,

                                    other_ref_type="rev",

                                    other_ref_name=rev2,

                                    ))

        response.mustcontain('%s@%s' % (GIT_REPO, rev1))

        response.mustcontain('%s@%s' % (GIT_REPO, rev2))

        ## outgoing changesets between those revisions

        response.mustcontain("""<a class="changeset_hash" href="/%s/changeset/38b5fe81f109cb111f549bfe9bb6b267e10bc557">r1:%s</a>""" % (GIT_REPO, rev2[:12]))

        response.mustcontain('1 file changed with 7 insertions and 0 deletions')

        ## files

        response.mustcontain("""<a href="#C--c8e92ef85cd1">.hgignore</a>""")

        self.log_user()

        rev1 = 'b986218ba1c9'

        rev2 = '3d8f361e72ab'

        response = self.app.get(url('compare_url',

                                    repo_name=HG_REPO,

                                    org_ref_type="rev",

                                    org_ref_name=rev1,

                                    other_ref_type="rev",

                                    other_ref_name=rev2,

                                    ),

                                extra_environ={'HTTP_X_PARTIAL_XHR': '1'},)

        ## outgoing changesets between those revisions

        response.mustcontain("""<a class="changeset_hash" href="/%s/changeset/3d8f361e72ab303da48d799ff1ac40d5ac37c67e">r1:%s</a>""" % (HG_REPO, rev2))

        response.mustcontain('Merge Ancestor')

        response.mustcontain("""<a class="changeset_hash" href="/%s/changeset/b986218ba1c9b0d6a259fac9b050b1724ed8e545">%s</a>""" % (HG_REPO, rev1))

        self.log_user()

        rev1 = 'c1214f7e79e02fc37156ff215cd71275450cffc3'

        rev2 = '38b5fe81f109cb111f549bfe9bb6b267e10bc557'

        response = self.app.get(url('compare_url',

                                    repo_name=GIT_REPO,

                                    org_ref_type="rev",

                                    org_ref_name=rev1,

                                    other_ref_type="rev",

                                    other_ref_name=rev2,

                                    ),

                                extra_environ={'HTTP_X_PARTIAL_XHR': '1'},)

        ## outgoing changesets between those revisions

        response.mustcontain("""<a class="changeset_hash" href="/%s/changeset/38b5fe81f109cb111f549bfe9bb6b267e10bc557">r1:%s</a>""" % (GIT_REPO, rev2[:12]))

        response.mustcontain('Merge Ancestor')

        response.mustcontain("""<a class="changeset_hash" href="/%s/changeset/c1214f7e79e02fc37156ff215cd71275450cffc3">%s</a>""" % (GIT_REPO, rev1[:12]))