New templatetag for pagination

gas/templates/gas/tags/pagination.html

@@ -0,0 +1,28 @@
+{% load i18n %}
+{% load custom_gas_tags %}
+
+{% if page %}
+<nav class="pagination">
+    <ul>
+        {% if page.has_previous %}
+        <li>
+            <a href="?{% url_replace request page=page.previous_page_number %}">{% trans "Previous" %}</a>
+        </li>
+        {% endif %}
+        <li class="current">
+            {% blocktrans with number=page.number total=page.paginator.num_pages %}
+            Page {{ number }} of {{ total }}
+            {% endblocktrans %}
+        </li>
+        {% if page.has_next %}
+            <li><a href="?{% url_replace request page=page.next_page_number %}">{% trans "Next" %}</a></li>
+        {% endif %}
+    </ul>
+
+    <p>
+        {% blocktrans with start=page.start_index end=page.end_index total_objects=page.paginator.count %}
+        From {{ start }} to {{ end }} of {{ total_objects }} total items.
+        {% endblocktrans %}
+    </p>
+</nav>
+{% endif %}

gas/templatetags/gas_tags.py

@@ -1,5 +1,6 @@
-# -*- coding: utf-8  -*-
 import datetime
+import json
+from urllib.parse import urlencode
 
 from django import template
 from django.utils.html import mark_safe
@@ -39,3 +40,23 @@ def display_boolean(value):
     else:
         render = '<i class="fas fa-times"></i>'
     return mark_safe(render)
+
+
+@register.simple_tag
+def url_replace(request, **kwargs):
+    query = request.GET.dict()
+    query.update(kwargs)
+    return urlencode(query)
+
+
+@register.inclusion_tag("gas/tags/pagination.html")
+def pagination(request, page):
+    return {
+        'request': request,
+        'page': page,
+    }
+
+
+@register.filter
+def to_json(data):
+    return mark_safe(json.dumps(data))