#   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')

        # as_form puts hidden input field with changeset revisions

        c.as_form = partial and request.GET.get('as_form')

        # swap url for compare_diff page - never partial and never as_form

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

            repo_name=other_repo,

            org_ref_type=other_ref_type, org_ref_name=other_ref_name,

            other_repo=org_repo,

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

        org_repo = Repository.get_by_repo_name(org_repo)

        other_repo = Repository.get_by_repo_name(other_repo)

        if org_repo is None:

            msg = 'Could not find org repo %s' % org_repo

            log.error(msg)

            h.flash(msg, category='error')

            return redirect(url('compare_home', repo_name=c.repo_name))

        if other_repo is None:

            msg = 'Could not find other repo %s' % other_repo

            log.error(msg)

            h.flash(msg, category='error')

            return redirect(url('compare_home', repo_name=c.repo_name))

        if org_repo.scm_instance.alias != other_repo.scm_instance.alias:

            msg = 'compare of two different kind of remote repos not available'

            log.error(msg)

            h.flash(msg, category='error')

            return redirect(url('compare_home', repo_name=c.repo_name))

        c.a_rev = self._get_ref_rev(org_repo, org_ref_type, org_ref_name)

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

        c.compare_home = False

        c.a_repo = org_repo

        c.cs_repo = other_repo

        c.cs_ref_name = other_ref_name

        c.cs_ref_type = other_ref_type

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

            org_repo.scm_instance.alias, org_repo.scm_instance, c.a_rev,

            other_repo.scm_instance, c.cs_rev)

        raw_ids = [x.raw_id for x in c.cs_ranges]

        c.cs_comments = other_repo.get_comments(raw_ids)

        c.statuses = other_repo.statuses(raw_ids)

        revs = [ctx.revision for ctx in reversed(c.cs_ranges)]

        c.jsdata = json.dumps(graph_data(c.cs_repo.scm_instance, revs))

        if partial:

            return render('compare/compare_cs.html')

        if merge and c.ancestor:

            # case we want a simple diff without incoming changesets,

            # previewing what will be merged.

            # Make the diff on the other repo (which is known to have other_rev)

            log.debug('Using ancestor %s as rev1 instead of %s'

                      % (c.ancestor, c.a_rev))

            rev1 = c.ancestor

            org_repo = other_repo

        else: # comparing tips, not necessarily linearly related

            if merge:

                log.error('Unable to find ancestor revision')

            if org_repo != other_repo:

                # TODO: we could do this by using hg unionrepo

                log.error('cannot compare across repos %s and %s', org_repo, other_repo)

                h.flash(_('Cannot compare repositories without using common ancestor'), category='error')

                raise HTTPBadRequest

            rev1 = c.a_rev

        diff_limit = self.cut_off_limit if not c.fulldiff else None

        log.debug('running diff between %s and %s in %s'

                  % (rev1, c.cs_rev, org_repo.scm_instance.path))

        txtdiff = org_repo.scm_instance.get_diff(rev1=rev1, rev2=c.cs_rev,

                                      ignore_whitespace=ignore_whitespace,

                                      context=line_context)

        diff_processor = diffs.DiffProcessor(txtdiff or '', format='gitdiff',

                                             diff_limit=diff_limit)

        _parsed = diff_processor.prepare()

        c.limited_diff = False

        if isinstance(_parsed, LimitedDiffContainer):

            c.limited_diff = True

        c.files = []

        c.changes = {}

                </div>

                <span style="float:right;margin-top:-3px">

                  <label>

                  ${_('Show inline comments')}

                  ${h.checkbox('',checked="checked",class_="show-inline-comments",id_for=h.FID(cs2,path))}

                  </label>

                </span>

            </div>

        </div>

        <div class="code-body">

            <div class="full_f_path" path="${h.safe_unicode(path)}"></div>

            ${diff|n}

            %if path.rsplit('.')[-1] in ['png', 'gif', 'jpg', 'bmp']:

              <div class="btn btn-image-diff-show">Show images</div>

              %if change =='M':

                <div id="${FID}_image-diff" class="btn btn-image-diff-swap" style="display:none">Press to swap images</div>

              %endif

              <div style="font-size: 0">

                %if change == 'M':

                  <img id="${FID}_image-diff-img-a" class="img-diff img-diff-swapable" style="display:none"

                      realsrc="${h.url('files_raw_home',repo_name=c.repo_name,revision=cs1,f_path=path)}" />

                %endif

                %if change in 'AM':

                  <img id="${FID}_image-diff-img-b" class="img-diff img-diff-swapable" style="display:none"

                      realsrc="${h.url('files_raw_home',repo_name=c.repo_name,revision=cs2,f_path=path)}" />

                %endif

              </div>

            %endif

        </div>

    </div>

%endfor

</div>

</%def>

<%def name="diff_block_simple(change)">

  %for op,filenode_path,diff in change:

    <div id="${h.FID('',filenode_path)}_target" style="clear:both;margin-top:25px"></div>

    <div id="${h.FID('',filenode_path)}" class="diffblock  margined comm">

      <div class="code-header">

          <div class="changeset_header">

              <div class="changeset_file">

                  ${h.safe_unicode(filenode_path)} |

                  ## TODO: link to ancestor and head of other instead of exactly other

                  %if op == 'A':

                    ${_('Added')}

                    <a class="spantag" href="${h.url('files_home', repo_name=c.cs_repo.repo_name, f_path=filenode_path, revision=c.cs_rev)}">${h.short_id(c.cs_ref_name) if c.cs_ref_type=='rev' else c.cs_ref_name}</a>

                  %elif op == 'M':

                    <i class="icon-arrow-right"></i>

                  %elif op == 'D':

                    ${_('Deleted')}

                    <a class="spantag" href="${h.url('files_home', repo_name=c.a_repo.repo_name, f_path=filenode_path, revision=c.a_rev)}">${h.short_id(c.a_ref_name) if c.a_ref_type=='rev' else c.a_ref_name}</a>

                  %else:

                    ${op}???

                  %endif

              </div>

              <div class="diff-actions">

                <a href="${h.url('files_diff_2way_home',repo_name=c.cs_repo.repo_name,f_path=h.safe_unicode(filenode_path),diff1=c.a_rev,diff2=c.cs_rev,diff='diff',fulldiff=1)}" class="tooltip" title="${h.tooltip(_('Show full side-by-side diff for this file'))}">

                  <img class="icon" src="${h.url('/images/icons/application_double.png')}"/>

                </a>

                ${c.ignorews_url(request.GET)}

                ${c.context_url(request.GET)}

              </div>

          </div>

      </div>

        <div class="code-body">

            <div class="full_f_path" path="${h.safe_unicode(filenode_path)}"></div>

            ${diff|n}

            %if filenode_path.rsplit('.')[-1] in ['png', 'gif', 'jpg', 'bmp']:

              <div class="btn btn-image-diff-show">Show images</div>

              %if op == 'M':

                <div id="${h.FID('',filenode_path)}_image-diff" class="btn btn-image-diff-swap" style="display:none">Press to swap images</div>

              %endif

              <div style="font-size: 0">

                %if op == 'M':

                  <img id="${h.FID('',filenode_path)}_image-diff-img-a" class="img-diff img-diff-swapable" style="display:none"

                      realsrc="${h.url('files_raw_home',repo_name=c.a_repo.repo_name,revision=c.a_rev,f_path=filenode_path) if op in 'DM' else ''}" />

                %endif

                %if op in 'AM':

                  <img id="${h.FID('',filenode_path)}_image-diff-img-b" class="img-diff img-diff-swapable" style="display:none"

                      realsrc="${h.url('files_raw_home',repo_name=c.cs_repo.repo_name,revision=c.cs_rev,f_path=filenode_path) if op in 'AM' else ''}" />

                %endif

              </div>

            %endif

        </div>

    </div>

  %endfor

</%def>

<%def name="diff_block_js()">

<script type="text/javascript">

$(document).ready(function(){

    $('.btn-image-diff-show').click(function(e){

        $('.btn-image-diff-show').hide();

        $('.btn-image-diff-swap').show();

        $('.img-diff-swapable')

            .each(function(i,e){

        </td>

        <td style="width: 140px"><span class="tooltip" title="${h.tooltip(h.age(cs.date))}">${cs.date}</span></td>

        <td><div class="gravatar" commit_id="${cs.raw_id}"><img alt="gravatar" src="${h.gravatar_url(h.email_or_none(cs.author),14)}" height="14" width="14"/></div></td>

        <td><div class="author">${h.person(cs.author)}</div></td>

        <td>${h.link_to(h.show_id(cs),h.url('changeset_home',repo_name=c.cs_repo.repo_name,revision=cs.raw_id))}</td>

        <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" commit_id="${cs.raw_id}" title="${_('Expand commit message')}">

            <i class="icon-resize-vertical" style="color:#DDD"></i>

        </td>

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

        </tr>

    %endfor

    </table>

    </div>

    %if c.as_form:

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

      ## 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'),

        )}

      </div>

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

        ${_('Common ancestor')}:

        %if c.ancestor:

        ${h.link_to(h.short_id(c.ancestor),h.url('changeset_home',repo_name=c.repo_name,revision=c.ancestor))}

        %else:

        ${_('No common ancestor found - repositories are unrelated')}

        %endif

      </div>

    %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')}

      </div>

    %endif

  %endif

</div>

%if c.as_form:

<div id="jsdata" style="display:none">${c.jsdata|n}</div>

%else:

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

%endif

<script type="text/javascript">

    $(document).ready(function(){

%if not c.as_form:

        var jsdata = ${c.jsdata|n};

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

        r.render(jsdata,100);

%endif

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

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

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

            r.render(jsdata,100);

        });

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

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

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

        });

    });

</script>