Add previous and next revision nav links to Changes view

Closes #174

codespeed/static/css/main.css

@@ -165,6 +165,18 @@ div#configbar span.options {
     padding-right: 1.8em; font-size: 90%; white-space: nowrap; }
 div#configbar input { margin-right: 0; vertical-align: middle; }
 
+div#contentnav a {
+    font-size: small;
+    padding-bottom: 0.25em;
+}
+div#contentnav a:hover { text-decoration: underline; }
+div#contentnav #previous {
+    float: left;
+}
+div#contentnav #next {
+    float: right;
+}
+
 div#content, div.about_content {
     margin-left: 14.5em;
     text-align: center;

codespeed/static/js/changes.js

@@ -5,10 +5,10 @@ var TIMELINE_URL = window.TIMELINE_URL, getLoadText = window.getLoadText;
 
 var currentproject, changethres, trendthres, projectmatrix, revisionboxes = {};
 
-function getConfiguration() {
+function getConfiguration(revision) {
     return {
         tre: $("#trend option:selected").val(),
-        rev: $("#revision option:selected").val(),
+        rev: revision || $("#revision option:selected").val(),
         exe: $("input[name='executable']:checked").val(),
         env: $("input[name='environment']:checked").val()
     };
@@ -66,14 +66,40 @@ function updateTable() {
 
     //Configure table as tablesorter
     $(".tablesorter").tablesorter({widgets: ['zebra']});
+
+    // Set prev and next links
+    $("#previous").click(function() {
+        refreshContentRev(
+            $("#previous").data("revision"),
+            $("#previous").data("desc")
+        );
+    });
+    $("#next").click(function() {
+        refreshContentRev(
+            $("#next").data("revision"),
+            $("#next").data("desc")
+        );
+    });
 }
 
 function refreshContent() {
+    refreshContentTable($("#revision option:selected").val());
+}
+
+function refreshContentRev(revision, desc) {
+    if ($('#revision option[value='+revision+']').length == 0) {
+        $("#revision").append($("<option value='" + revision + "'>" + desc + "</option>"));
+    }
+    $("#revision").val(revision);
+    refreshContentTable(revision);
+}
+
+function refreshContentTable(revision) {
     var h = $("#content").height();//get height for loading text
     $("#contentwrap").fadeOut("fast", function() {
         $(this).show();
         $(this).html(getLoadText("Loading...", h));
-        $(this).load("table/", $.param(getConfiguration()), function() { updateTable(); });
+        $(this).load("table/", $.param(getConfiguration(revision)), function() { updateTable(); });
     });
 }
 

codespeed/templates/codespeed/changes_table.html

 {% load percentages %}
 
+<div id="contentnav">
+  {% if prev %}<a id="previous" href="#" data-revision="{{ prev.rev }}" data-desc="{{ prev.desc }}">← {{ prev.short_rev }}{% if prev.summary %} ({{ prev.summary }}){% endif %}</a>{% endif %}
+  {% if next %}<a id="next" href="#" data-revision="{{ next.rev }}" data-desc="{{ next.desc }}">{{ next.short_rev }}{% if next.summary %} ({{ next.summary }}){% endif %} →</a>{% endif %}
+</div>
+
 {% for units in tablelist %}
 <table class="tablesorter" data-lessisbetter="{{ units.lessisbetter }}">
 <thead>

codespeed/views.py

@@ -497,6 +497,47 @@ def getchangestable(request):
         raise Http404()
     selectedrev = get_object_or_404(Revision, commitid=request.GET.get('rev'),
                                     branch__project=executable.project)
+    prevrev = Revision.objects.filter(
+        branch=selectedrev.branch,
+        date__lt=selectedrev.date,
+    ).order_by('-date').first()
+    if prevrev:
+        try:
+            summary = Report.objects.get(
+                revision=prevrev,
+                executable=executable,
+                environment=environment).item_description
+        except Report.DoesNotExist:
+            summary = ''
+        prevrev = {
+            'desc': str(prevrev),
+            'rev': prevrev.commitid,
+            'short_rev': prevrev.get_short_commitid(),
+            'summary': summary,
+        }
+    else:
+        prevrev = None
+
+    nextrev = Revision.objects.filter(
+        branch=selectedrev.branch,
+        date__gt=selectedrev.date,
+    ).order_by('date').first()
+    if nextrev:
+        try:
+            summary = Report.objects.get(
+                revision=nextrev,
+                executable=executable,
+                environment=environment).item_description
+        except Report.DoesNotExist:
+            summary = ''
+        nextrev = {
+            'desc': str(nextrev),
+            'rev': nextrev.commitid,
+            'short_rev': nextrev.get_short_commitid(),
+            'summary': summary,
+        }
+    else:
+        nextrev = None
 
     report, created = Report.objects.get_or_create(
         executable=executable, environment=environment, revision=selectedrev
@@ -515,6 +556,8 @@ def getchangestable(request):
         'rev': selectedrev,
         'exe': executable,
         'env': environment,
+        'prev': prevrev,
+        'next': nextrev,
     }, context_instance=RequestContext(request))