Add public filters based on meta data (#3673)

* Add public filters based on meta data

* Fix licenseheaders

* ignore empty values

* Fix tests

* Full non-widget implementation

* Widget support

* Add a few tests

* Allow to reorder properties

* Fix isort

* Allow to opt-out for specific events

* Fix name clash between new and old field to make migration feasible

src/pretix/presale/templates/pretixpresale/event/fragment_subevent_calendar.html

@@ -1,6 +1,7 @@
 {% load i18n %}
 {% load eventurl %}
 {% load urlreplace %}
+{% include "pretixpresale/fragment_event_list_filter.html" with request=request %}
 <nav aria-label="{% trans "calendar navigation" %}">
     <ul class="row calendar-nav">
         <li class="col-sm-4 col-xs-2 text-left flip">

src/pretix/presale/templates/pretixpresale/event/fragment_subevent_calendar_week.html

@@ -1,6 +1,7 @@
 {% load i18n %}
 {% load eventurl %}
 {% load urlreplace %}
+{% include "pretixpresale/fragment_event_list_filter.html" with request=request %}
 <nav aria-label="{% trans "calendar navigation" %}">
     <ul class="row calendar-nav">
         <li class="col-sm-4 col-xs-2 text-left flip">

src/pretix/presale/templates/pretixpresale/event/fragment_subevent_list.html

@@ -1,5 +1,6 @@
 {% load i18n %}
 {% load eventurl %}
+{% include "pretixpresale/fragment_event_list_filter.html" with request=request %}
 <ul class="list-unstyled">
 {% for subev in subevent_list.subevent_list %}
     <li class="subevent-row">

src/pretix/presale/templates/pretixpresale/event/index.html

@@ -70,7 +70,7 @@
             {% endif %}
         {% endif %}
 
-        {% if subevent and "date" not in request.GET %}
+        {% if subevent and "date" not in request.GET and "filtered" not in request.GET %}
             <p>
             {% if show_cart %}
                 <button class="subevent-toggle btn btn-primary btn-block btn-lg" aria-expanded="false">

src/pretix/presale/templates/pretixpresale/fragment_event_list_filter.html

@@ -0,0 +1,25 @@
+{% load i18n %}
+{% load eventurl %}
+{% load urlreplace %}
+{% load bootstrap3 %}
+{% load getitem %}
+
+{% if filter_form.fields %}
+    <form class="event-list-filter-form" method="get">
+        <input type="hidden" name="filtered" value="1">
+        {% for f, v in request.GET.items %}
+            {% if f not in filter_form.fields %}
+                <input type="hidden" name="{{ f }}" value="{{ v }}">
+            {% endif %}
+        {% endfor %}
+        <div class="event-list-filter-form-row">
+            {% for f in filter_form.fields %}
+                {% bootstrap_field filter_form|getitem:f %}
+            {% endfor %}
+            <button type="submit" class="btn btn-primary">
+                <span class="fa fa-filter" aria-hidden="true"></span>
+                {% trans "Filter" %}
+            </button>
+        </div>
+    </form>
+{% endif %}

src/pretix/presale/templates/pretixpresale/organizers/calendar.html

@@ -53,6 +53,7 @@
             </div>
         </div>
     </form>
+    {% include "pretixpresale/fragment_event_list_filter.html" with request=request %}
     {% include "pretixpresale/fragment_calendar.html" with show_avail=request.organizer.settings.event_list_availability %}
 
     {% if multiple_timezones %}

src/pretix/presale/templates/pretixpresale/organizers/calendar_day.html

@@ -46,6 +46,7 @@
             </div>
         </div>
     </form>
+    {% include "pretixpresale/fragment_event_list_filter.html" with request=request %}
     {% include "pretixpresale/fragment_day_calendar.html" with show_avail=request.organizer.settings.event_list_availability %}
     <div class="col-sm-4 visible-xs text-center">
         {% if has_before %}

src/pretix/presale/templates/pretixpresale/organizers/calendar_week.html

@@ -58,6 +58,7 @@
             </div>
         </div>
     </form>
+    {% include "pretixpresale/fragment_event_list_filter.html" with request=request %}
     {% include "pretixpresale/fragment_week_calendar.html" with show_avail=request.organizer.settings.event_list_availability %}
     <div class="col-sm-12 visible-sm visible-xs text-center">
         {% if has_before %}

src/pretix/presale/templates/pretixpresale/organizers/index.html

@@ -33,6 +33,7 @@
             </div>
         </div>
     </div>
+    {% include "pretixpresale/fragment_event_list_filter.html" with request=request %}
     {% if events %}
     <div class="event-list">
         <div class="row hidden-xs hidden-sm">
@@ -124,7 +125,7 @@
                     {% endif %}
                 </div>
                 <div class="col-md-2 col-xs-6 text-right flip">
-                    <a class="btn btn-primary btn-block" href="{{ url }}">
+                    <a class="btn btn-primary btn-block" href="{{ url }}{% if e.has_subevents and e.match_by_subevents %}{{ filterquery }}{% endif %}">
                         {% if e.has_subevents %}<span class="fa fa-ticket" aria-hidden="true"></span> {% trans "Tickets" %}
                         {% elif e.presale_is_running and e.best_availability_state == 100 %}
                             <span class="fa fa-ticket" aria-hidden="true"></span> {% trans "Tickets" %}