Added voucher tag statistics

src/pretix/control/templates/pretixcontrol/vouchers/base.html

@@ -10,6 +10,11 @@
                 {% trans "All Vouchers" %}
             </a>
         </li>
+        <li {% if "event.vouchers.tags" == url_name %}class="active"{% endif %}>
+            <a href="{% url 'control:event.vouchers.tags' organizer=request.event.organizer.slug event=request.event.slug %}">
+                {% trans "Tags" %}
+            </a>
+        </li>
     </ul>
     {% block inside %}
     {% endblock %}

src/pretix/control/templates/pretixcontrol/vouchers/tags.html

@@ -0,0 +1,47 @@
+{% extends "pretixcontrol/vouchers/base.html" %}
+{% load i18n %}
+{% block inside %}
+    <p>
+        {% blocktrans trimmed %}
+            If you add a "tag" to a voucher, you can here see statistics on their usage.
+        {% endblocktrans %}
+    </p>
+    {% if tags|length == 0 %}
+        <div class="empty-collection">
+            <p>
+                {% blocktrans trimmed %}
+                    You haven't added any tags to vouchers yet.
+                {% endblocktrans %}
+            </p>
+        </div>
+    {% else %}
+        <div class="table-responsive">
+            <table class="table table-hover table-condensed">
+                <thead>
+                <tr>
+                    <th>{% trans "Tag" %}</th>
+                    <th>{% trans "Redeemed vouchers" %}</th>
+                </tr>
+                </thead>
+                <tbody>
+                {% for t in tags %}
+                    <tr>
+                        <td>
+                            <strong><a
+                                    href="{% url "control:event.vouchers" organizer=request.event.organizer.slug event=request.event.slug %}?tag={{ t.tag|urlencode }}">
+                                {{ t.tag }}
+                            </a></strong> <small>({{ t.redeemed }} / {{ t.total }})</small>
+                        </td>
+                        <td>
+                            <div class="progress">
+                                <div class="progress-bar progress-bar-{{ t.percentage }}">
+                                </div>
+                            </div>
+                        </td>
+                    </tr>
+                {% endfor %}
+                </tbody>
+            </table>
+        </div>
+    {% endif %}
+{% endblock %}

src/pretix/control/urls.py

@@ -59,6 +59,7 @@ urlpatterns = [
             name='event.items.quotas.delete'),
         url(r'^quotas/add$', item.QuotaCreate.as_view(), name='event.items.quotas.add'),
         url(r'^vouchers/$', vouchers.VoucherList.as_view(), name='event.vouchers'),
+        url(r'^vouchers/tags/$', vouchers.VoucherTags.as_view(), name='event.vouchers.tags'),
         url(r'^vouchers/(?P<voucher>\d+)/$', vouchers.VoucherUpdate.as_view(), name='event.voucher'),
         url(r'^vouchers/(?P<voucher>\d+)/delete$', vouchers.VoucherDelete.as_view(),
             name='event.voucher.delete'),

src/pretix/control/views/vouchers.py

@@ -1,11 +1,13 @@
 from django.contrib import messages
 from django.core.urlresolvers import resolve, reverse
 from django.db import transaction
-from django.db.models import Q
+from django.db.models import Count, Q, Sum
 from django.http import Http404, HttpResponseRedirect
 from django.utils.timezone import now
 from django.utils.translation import ugettext_lazy as _
-from django.views.generic import CreateView, DeleteView, ListView, UpdateView
+from django.views.generic import (
+    CreateView, DeleteView, ListView, TemplateView, UpdateView,
+)
 
 from pretix.base.models import Voucher
 from pretix.control.forms.vouchers import VoucherBulkForm, VoucherForm
@@ -39,6 +41,24 @@ class VoucherList(EventPermissionRequiredMixin, ListView):
         return qs
 
 
+class VoucherTags(EventPermissionRequiredMixin, TemplateView):
+    template_name = 'pretixcontrol/vouchers/tags.html'
+    permission = 'can_change_vouchers'
+
+    def get_context_data(self, **kwargs):
+        ctx = super().get_context_data(**kwargs)
+
+        tags = self.request.event.vouchers.order_by().filter(tag__isnull=False).values('tag').annotate(
+            total=Count('id'),
+            redeemed=Sum('redeemed')
+        )
+        for t in tags:
+            t['percentage'] = int((t['redeemed'] / t['total']) * 100)
+
+        ctx['tags'] = tags
+        return ctx
+
+
 class VoucherDelete(EventPermissionRequiredMixin, DeleteView):
     model = Voucher
     template_name = 'pretixcontrol/vouchers/delete.html'

src/static/pretixcontrol/scss/main.scss

@@ -111,4 +111,12 @@ h1 .btn-sm {
         font-size: 200px;
         color: #ccc;
     }
-}
+}
+.table .progress {
+    margin-bottom: 0;
+}
+
+@for $i from 0 through 100 {
+  .progress-bar-#{$i} { width: 1% * $i; }
+}
+