class="selected" helpers

lib/jingo/templatetags.py

@@ -26,3 +26,15 @@ def nl2br(string):
 @register.filter
 def datetime(t, format=_('%B %d, %Y')):
     return t.strftime(format)
+
+
+@register.filter
+def selected(a, b, text='selected'):
+    """Return ``text`` if a == b."""
+    return jinja2.Markup(text if a == b else '')
+
+
+@register.filter
+def class_selected(a, b):
+    """Return 'class="selected"' if a == b."""
+    return selected(a, b, 'class="selected"')