Implement group delete functionality

wagtail/wagtailusers/templates/wagtailusers/groups/confirm_delete.html

@@ -0,0 +1,33 @@
+{% extends "wagtailadmin/base.html" %}
+{% load i18n %}
+{% block titletag %}{% trans "Delete group" %}{% endblock %}
+{% block bodyclass %}menu-groups{% endblock %}
+
+{% block content %}
+    {% trans "Delete group" as del_str %}
+    {% include "wagtailadmin/shared/header.html" with title=del_str subtitle=group.name icon="group" %}
+
+    <div class="row row-flush nice-padding">
+        <div class="col6">
+            <p>
+                {% blocktrans with group_user_count=group.user_set.count group_name=group.name %}The group '{{ group_name }}' has <strong>{{ group_user_count }}</strong> users assigned.{% endblocktrans %}
+            </p>
+            <p>
+                {% if group.user_set.count %}
+                    If you delete the group, those users will lose the permissions
+                    granted to them by membership of this group, but retain
+                    permissions they have through membership of other groups.
+                {% else %}
+                    It is probably safe to delete.
+                {% endif %}
+            </p>
+        </div>
+        <div class="col6">
+            <p>{% trans "Are you sure you want to delete this group?" %}</p>
+            <form action="{% url 'wagtailusers_groups_delete' group.id %}" method="POST">
+                {% csrf_token %}
+                <input type="submit" value="{% trans 'Yes, delete' %}" class="serious" />
+            </form>
+        </div>
+    </div>
+{% endblock %}

wagtail/wagtailusers/templates/wagtailusers/groups/edit.html

@@ -16,7 +16,11 @@
                 {% include "wagtailadmin/shared/field_as_li.html" with field=form.name %}
                 {% format_permissions permission_bound_field=form.permissions %}
                 {% include "wagtailusers/groups/includes/page_permissions_formset.html" with formset=formset only %}
-                <li><input type="submit" value="{% trans 'Save' %}" /></li>
+                <li><input type="submit" value="{% trans 'Save' %}" />
+                {% if perms.auth.delete_group %}
+                    <a href="{% url 'wagtailusers_groups_delete' group.id %}" class="button button-secondary no">{% trans "Delete group" %}</a>
+                {% endif %}
+                </li>
             </ul>
         </div>
     </form>

wagtail/wagtailusers/urls/groups.py

@@ -5,4 +5,5 @@ urlpatterns = [
     url(r'^$', groups.index, name='wagtailusers_groups_index'),
     url(r'^new/$', groups.create, name='wagtailusers_groups_create'),
     url(r'^(\d+)/$', groups.edit, name='wagtailusers_groups_edit'),
+    url(r'^(\d+)/delete/$', groups.delete, name='wagtailusers_groups_delete'),
 ]

wagtail/wagtailusers/views/groups.py

@@ -133,3 +133,17 @@ def edit(request, group_id):
         'form': form,
         'formset': formset,
     })
+
+
+@permission_required('auth.delete_group')
+def delete(request, group_id):
+    group = get_object_or_404(Group, id=group_id)
+
+    if request.POST:
+        group.delete()
+        messages.success(request, _("Group '{0}' deleted.").format(group.name))
+        return redirect('wagtailusers_groups_index')
+
+    return render(request, "wagtailusers/groups/confirm_delete.html", {
+        'group': group,
+    })