misc: add a |decimal template tag (#27699)

tests/test_templates.py

@@ -4,6 +4,7 @@ import pytest
 
 from quixote import cleanup
 from qommon.template import Template, TemplateError
+from wcs.conditions import Condition
 
 from utilities import create_temporary_pub, clean_temporary_pub
 
@@ -141,3 +142,17 @@ def test_datetime_templatetags():
 def test_variable_unicode_error_handling():
     tmpl = Template('{{ form_var_éléphant }}')
     assert tmpl.render() == ''
+
+def test_decimal_templatetag():
+    tmpl = Template('{{ plop|decimal }}')
+    assert tmpl.render({'plop': 'toto'}) == ''
+    assert tmpl.render({'plop': '3.14'}) == '3.14'
+    assert tmpl.render({'plop': '3,14'}) == '3.14'
+    assert tmpl.render({'plop': 3.14}) == '3.14'
+    assert tmpl.render({'plop': 12345.678}) == '12345.678'
+    assert tmpl.render({'plop': None}) == ''
+
+    tmpl = Template('{% if plop|decimal > 2 %}hello{% endif %}')
+    assert tmpl.render({'plop': 3}) == 'hello'
+    assert tmpl.render({'plop': 1}) == ''
+    assert tmpl.render({'plop': None}) == 'hello'  # will be str > int, always True.

wcs/qommon/templatetags/qommon.py

@@ -15,6 +15,7 @@
 # along with this program; if not, see <http://www.gnu.org/licenses/>.
 
 import datetime
+from decimal import Decimal
 
 from django import template
 from django.template import defaultfilters
@@ -75,6 +76,18 @@ def date(value, arg=None):
         value = parse_date(value)
     return defaultfilters.date(value, arg=arg)
 
+@register.filter(is_safe=True)
+def decimal(value):
+    if not value:
+        return ''
+    try:
+        if isinstance(value, basestring):
+            # replace , by . for French users comfort
+            value = value.replace(',', '.')
+        return Decimal(value).quantize(Decimal('1.0000')).normalize()
+    except ArithmeticError:
+        return ''
+
 @register.simple_tag
 def standard_text(text_id):
     return mark_safe(TextsDirectory.get_html_text(str(text_id)))