Top tags box on front page (bug 532685)

apps/addons/templates/addons/home.html

@@ -133,6 +133,24 @@
 {% endblock %}
 
 {% block under_categories %}
+{% cache top_tags %}
+  {% if top_tags %}
+  {% set max_tag_count = top_tags[0].popularity or 1 %}
+  <div class="highlight" id="tag-box">
+    <h3>{{ _('Popular Tags') }}</h3>
+    <div class="tag-cloud">
+      {% for tag in top_tags|list|shuffle %}
+        {{ tag_link(tag.tag_text, tag.tagstat.num_addons, max_tag_count) }}
+      {% endfor %}
+    </div>
+    <p class="more">
+      <a href="{{ remora_url('/tags/top') }}">{{
+        _('View Top 100 Tags &rsaquo;')|safe }}</a>
+    </p>
+  </div>
+  {% endif %}
+{% endcache %}
+
 <div class="highlight">
   <h3>{{ _('Build a {0} Add-on')|f(request.APP.pretty) }}</h3>
   <p>{{ _('Find all the tools and resouces you need to make your first add-on.') }}</p>
@@ -140,3 +158,10 @@
   <p><strong><a href="/developers">{{ _('Visit the Developer Hub') }}</a></strong></p>
 </div>
 {% endblock %}
+
+{% macro tag_link(tag_text, tag_count, max_count) -%}
+{% with factor=(tag_count/max_count*10)|wround(method='ceil') %}
+  <a class="tagLevel{{ factor }} tag" href="{{
+    remora_url('/tag/' + tag_text) }}">{{ tag_text }}</a>
+{% endwith %}
+{%- endmacro %}

apps/addons/views.py

@@ -13,6 +13,7 @@ from amo.urlresolvers import reverse
 from bandwagon.models import Collection, CollectionFeature, CollectionPromo
 from users.models import UserProfile
 from stats.models import GlobalStat
+from tags.models import Tag
 from .models import Addon
 
 
@@ -163,10 +164,15 @@ def home(request):
     except GlobalStat.DoesNotExist:
         downloads = pings = None
 
+    # Top tags.
+    top_tags = Tag.objects.not_blacklisted().select_related(
+        'tagstat').order_by('-tagstat__num_addons')[:10]
+
     return jingo.render(request, 'addons/home.html',
                         {'downloads': downloads, 'pings': pings,
                          'filter': filter, 'addon_sets': addon_sets,
                          'collections': collections, 'promobox': promobox,
+                         'top_tags': top_tags,
                         })
 
 

apps/amo/helpers.py

@@ -2,6 +2,7 @@ import cgi
 import collections
 import json as jsonlib
 import math
+import random
 import urllib
 import urlparse
 
@@ -277,3 +278,10 @@ def strip_controls(s):
 def external_url(url):
     """Bounce a URL off outgoing.mozilla.org."""
     return urlresolvers.get_outgoing_url(unicode(url))
+
+
+@register.filter
+def shuffle(sequence):
+    """Shuffle a sequence."""
+    random.shuffle(sequence)
+    return sequence