misc: add unaccent filter (#44811)

tests/test_templates.py

@@ -158,6 +158,14 @@ def test_strip_templatetag():
     assert tmpl.render({'foo': ' foo barXX'}) == ' foo bar'
 
 
+def test_unaccent_templatetag():
+    tmpl = Template('{{ foo|unaccent }}')
+    assert tmpl.render() == ''
+    assert tmpl.render({'foo': None}) == ''
+    assert tmpl.render({'foo': 'FOO bar'}) == 'FOO bar'
+    assert tmpl.render({'foo': 'félé'}) == 'fele'
+
+
 def test_template_encoding():
     # django
     tmpl = Template('{{ foo }} à vélo')

wcs/qommon/templatetags/qommon.py

@@ -22,6 +22,7 @@ import hashlib
 import math
 import string
 import random
+import unicodedata
 
 import pyproj
 from pyproj import Geod
@@ -89,6 +90,13 @@ def strip(string, chars=None):
         return force_text(string).strip()
 
 
+@register.filter
+def unaccent(value):
+    if not value:
+        return ''
+    return force_text(unicodedata.normalize('NFKD', value).encode('ascii', 'ignore'))
+
+
 @register.filter
 def parse_date(date_string):
     try: