view_helpers template tags.

shared/utils/templatetags/view_helpers.py

@@ -0,0 +1,24 @@
+from urllib.parse import urlencode
+
+from django import template
+
+
+register = template.Library()
+
+
+@register.simple_tag(takes_context=True)
+def url_replace(context, **kwargs):
+    query = context['request'].GET.dict()
+    query.update(kwargs)
+    return urlencode(query)
+
+
+@register.filter
+def paginator_context(page_range, current):
+    before = [p for p in page_range if p < current]
+    after = [p for p in page_range if p > current]
+    if len(before) > 3:
+        before = before[:2] + [''] + before[-1:]
+    if len(after) > 3:
+        after = after[:1] + [''] + after[-2:]
+    return before + [current] + after