From cf382652f51cc90d5db538d29b6331c96e70f03f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20P=C3=A9ters?= <fpeters@entrouvert.com>
Date: Thu, 30 Aug 2018 17:33:47 +0200
Subject: [PATCH] misc: add startswith templatetag (#25972)

---
 tests/test_templates.py           | 6 ++++++
 wcs/qommon/templatetags/qommon.py | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/tests/test_templates.py b/tests/test_templates.py
index 00ccc1dd..21245566 100644
--- a/tests/test_templates.py
+++ b/tests/test_templates.py
@@ -67,6 +67,12 @@ def test_template_templatetag():
     tmpl = Template('{% load i18n %}{% trans "hello" %}')
     assert tmpl.render() == 'hello'
 
+def test_startswith_templatetag():
+    tmpl = Template('{% if foo|startswith:"bar" %}hello{% endif %}')
+    assert tmpl.render() == ''
+    assert tmpl.render({'foo': 'bar-baz'}) == 'hello'
+    assert tmpl.render({'foo': 'baz-bar'}) == ''
+
 def test_template_encoding():
     # django
     tmpl = Template('{{ foo }} à vélo')
diff --git a/wcs/qommon/templatetags/qommon.py b/wcs/qommon/templatetags/qommon.py
index 8e24078e..64a6c958 100644
--- a/wcs/qommon/templatetags/qommon.py
+++ b/wcs/qommon/templatetags/qommon.py
@@ -27,6 +27,10 @@ register = template.Library()
 def get(mapping, key):
     return mapping.get(key)
 
+@register.filter
+def startswith(string, substring):
+    return string and string.startswith(substring)
+
 @register.filter
 def parse_date(date_string):
     try:
-- 
2.18.0