if (branch_name and

            branch_name not in c.db_repo_scm_instance.branches and

            branch_name not in c.db_repo_scm_instance.closed_branches and

            not revision):

            return redirect(url('changelog_file_home', repo_name=c.repo_name,

                                    revision=branch_name, f_path=f_path or ''))

        if revision == 'tip':

            revision = None

        c.changelog_for_path = f_path

        try:

            if f_path:

                log.debug('generating changelog for path %s' % f_path)

                # get the history for the file !

                tip_cs = c.db_repo_scm_instance.get_changeset()

                try:

                    collection = tip_cs.get_file_history(f_path)

                except (NodeDoesNotExistError, ChangesetError):

                    #this node is not present at tip !

                    try:

                        cs = self.__get_cs(revision, repo_name)

                        collection = cs.get_file_history(f_path)

                    except RepositoryError, e:

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

                        redirect(h.url('changelog_home', repo_name=repo_name))

                collection = list(reversed(collection))

            else:

                collection = c.db_repo_scm_instance.get_changesets(start=0, end=revision,

                                                        branch_name=branch_name)

            c.total_cs = len(collection)

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

                                    items_per_page=c.size, branch=branch_name,)

            page_revisions = [x.raw_id for x in c.pagination]

            c.comments = c.db_repo.get_comments(page_revisions)

            c.statuses = c.db_repo.statuses(page_revisions)

        except (EmptyRepositoryError), e:

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

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

        except (RepositoryError, ChangesetDoesNotExistError, Exception), e:

            log.error(traceback.format_exc())

            h.flash(safe_str(e), category='error')

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

        c.branch_name = branch_name

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

        if c.db_repo_scm_instance.closed_branches:

            prefix = _('(closed)') + ' '

            c.branch_filters += [('-', '-')] + \

                [(k, prefix + k) for k in c.db_repo_scm_instance.closed_branches.keys()]

        revs = []

        if not f_path:

            revs = [x.revision for x in c.pagination]

        c.jsdata = json.dumps(graph_data(c.db_repo_scm_instance, revs))

        c.revision = revision # requested revision ref

        c.first_revision = c.pagination[0] # pagination is never empty here!

        return render('changelog/changelog.html')

    @LoginRequired()

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

                                   'repository.admin')

    def changelog_details(self, cs):

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

            c.cs = c.db_repo_scm_instance.get_changeset(cs)

            return render('changelog/changelog_details.html')

        raise HTTPNotFound()

    @LoginRequired()

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

                                   'repository.admin')

    def changelog_summary(self, repo_name):

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

            _load_changelog_summary()

            return render('changelog/changelog_summary_data.html')

        raise HTTPNotFound()

    %if c.revision:

    @ ${h.short_id(c.first_revision.raw_id)}

    %endif

    - ${ungettext('showing %d out of %d revision', 'showing %d out of %d revisions', size) % (size, c.total_cs)}

</%def>

<%def name="page_nav()">

    ${self.menu('repositories')}

</%def>

<%def name="main()">

${self.repo_context_bar('changelog', c.first_revision.raw_id if c.first_revision else None)}

<div class="box">

    <!-- box / title -->

    <div class="title">

        ${self.breadcrumbs()}

    </div>

    <div class="table">

        % if c.pagination:

            <div>

                <div style="overflow:auto; display:${'none' if c.changelog_for_path else ''}">

                    <div class="container_header">

                        <div style="float:left; margin-left:20px;">

                        ${h.form(h.url.current(),method='get')}

                            ${h.submit('set',_('Show'),class_="btn btn-small")}

                            ${h.text('size',size=1,value=c.size)}

                            ${_('revisions')}

                            %if c.branch_name:

                            ${h.hidden('branch', c.branch_name)}

                            %endif

                        ${h.end_form()}

                        </div>

                        <div style="float: right; margin: 0px 0px 0px 4px">

                            <a href="#" class="btn btn-small" id="rev_range_container" style="display:none"></a>

                            <a href="#" class="btn btn-small" id="rev_range_clear" style="display:none">${_('Clear selection')}</a>

                            %if c.revision:

                                <a class="btn btn-small" href="${h.url('changelog_home', repo_name=c.repo_name)}">

                                    ${_('Go to tip of repository')}

                                </a>

                            %endif

                            %if c.db_repo.fork:

                                <a id="compare_fork"

                                   title="${_('Compare fork with %s' % c.db_repo.fork.repo_name)}"

                                   href="${h.url('compare_url',repo_name=c.db_repo.fork.repo_name,org_ref_type=c.db_repo.landing_rev[0],org_ref_name=c.db_repo.landing_rev[1],other_repo=c.repo_name,other_ref_type='branch' if request.GET.get('branch') else c.db_repo.landing_rev[0],other_ref_name=request.GET.get('branch') or c.db_repo.landing_rev[1], merge=1)}"

                                   class="btn btn-small"><i class="icon-loop"></i> ${_('Compare fork with parent repo (%s)' % c.db_repo.fork.repo_name)}</a>

                            %endif

                            ## text and href of open_new_pr is controlled from javascript

                            <a id="open_new_pr" class="btn btn-small"></a>

                        </div>

                    </div>

                </div>

                <div id="graph_nodes">

                    <canvas id="graph_canvas"></canvas>

                </div>

                <div id="graph_content" style="${'margin: 0px' if c.changelog_for_path else ''}">

                <table id="changesets">

                <tbody>

                %for cnt,cs in enumerate(c.pagination):

                    <tr id="chg_${cnt+1}" class="container ${'tablerow%s' % (cnt%2)}">

                        <td class="checkbox">

                            %if c.changelog_for_path:

                                ${h.checkbox(cs.raw_id,class_="changeset_range", disabled="disabled")}

                            %else:

                                ${h.checkbox(cs.raw_id,class_="changeset_range")}

                            %endif

                        <td class="status">

                          %if c.statuses.get(cs.raw_id):

                            <div class="changeset-status-ico">

                            %if c.statuses.get(cs.raw_id)[2]:

                              <a class="tooltip" title="${_('Changeset status: %s\nClick to open associated pull request #%s') % (h.changeset_status_lbl(c.statuses.get(cs.raw_id)[0]), c.statuses.get(cs.raw_id)[2])}" href="${h.url('pullrequest_show',repo_name=c.statuses.get(cs.raw_id)[3],pull_request_id=c.statuses.get(cs.raw_id)[2])}">

                                <img src="${h.url('/images/icons/flag_status_%s.png' % c.statuses.get(cs.raw_id)[0])}" />

                              </a>

                            %else:

                              <a class="tooltip" title="${_('Changeset status: %s') % h.changeset_status_lbl(c.statuses.get(cs.raw_id)[0])}" href="${h.url('changeset_home',repo_name=c.repo_name,revision=cs.raw_id,anchor='comment-%s' % c.comments[cs.raw_id][0].comment_id)}">

                                  <img src="${h.url('/images/icons/flag_status_%s.png' % c.statuses.get(cs.raw_id)[0])}" />

                              </a>

                            %endif

                            </div>

                          %endif

                        </td>

                        <td class="author">

                            <img alt="gravatar" src="${h.gravatar_url(h.email_or_none(cs.author),16)}"/>

                            <span title="${cs.author}" class="user">${h.shorter(h.person(cs.author),22)}</span>

                        </td>

                        <td class="hash" style="width:${len(h.show_id(cs))*6.5}px">

                            <a href="${h.url('changeset_home',repo_name=c.repo_name,revision=cs.raw_id)}">

                                <span class="changeset_hash">${h.show_id(cs)}</span>

                            </a>

                        </td>

                        <td class="date">

                            <div class="date">${h.age(cs.date,True)}</div>

                        </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 class="mid">

                            <div class="log-container">

                            YUD.get('open_new_pr').href = pyroutes.url('pullrequest_home',

                                                                       {'repo_name': '${c.repo_name}',

                                                                        'rev_end':'${c.first_revision.raw_id}'});

                        %else:

                            YUD.get('open_new_pr').href = pyroutes.url('pullrequest_home',

                                                                       {'repo_name': '${c.repo_name}',

                                                                        'branch':'${c.first_revision.branch}'});

                        %endif

                        YUD.setStyle('compare_fork','display','');

                    }

                };

                YUE.onDOMReady(checkbox_checker);

                YUE.on(checkboxes,'click', checkbox_checker);

                YUE.on('rev_range_clear','click',function(e){

                    for (var i=0; i<checkboxes.length; i++){

                        var cb = checkboxes[i];

                        cb.checked = false;

                    }

                    checkbox_checker();

                    YUE.preventDefault(e);

                });

                var msgs = YUQ('.message');

                // get first element height

                var el = YUQ('#graph_content .container')[0];

                var row_h = el.clientHeight;

                for(var i=0;i<msgs.length;i++){

                    var m = msgs[i];

                    var h = m.clientHeight;

                    var pad = YUD.getStyle(m,'padding');

                    if(h > row_h){

                        var offset = row_h - (h+12);

                        YUD.setStyle(m.nextElementSibling,'display','block');

                        YUD.setStyle(m.nextElementSibling,'margin-top',offset+'px');

                    };

                }

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

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

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

                    //redraw the graph, r and jsdata are bound outside function

                    r.render(jsdata,100);

                });

                // change branch filter

                    var selected_branch = e.currentTarget.options[e.currentTarget.selectedIndex].value;

                    if(selected_branch != ''){

                        window.location = pyroutes.url('changelog_home', {'repo_name': '${c.repo_name}',

                                                                          'branch':selected_branch});

                    }else{

                        window.location = pyroutes.url('changelog_home', {'repo_name': '${c.repo_name}'});

                    }

                });

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

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

                r.render(jsdata,100);

            });

        </script>

        %else:

            ${_('There are no changes yet')}

        %endif

    </div>

</div>

</%def>