Fixed #24451 -- Deprecated comma-separated {% cycle %} syntax.

django/template/defaulttags.py

@@ -654,6 +654,10 @@ def cycle(parser, token):
         raise TemplateSyntaxError("'cycle' tag requires at least two arguments")
 
     if ',' in args[1]:
+        warnings.warn(
+            "The old {% cycle %} syntax with comma-separated arguments is deprecated.",
+            RemovedInDjango20Warning,
+        )
         # Backwards compatibility: {% cycle a,b %} or {% cycle a,b as foo %}
         # case.
         args[1:2] = ['"%s"' % arg for arg in args[1].split(",")]

docs/internals/deprecation.txt

@@ -187,6 +187,9 @@ details on these changes.
   from ``allow_migrate(self, db, model)`` to
   ``allow_migrate(self, db, app_label, model_name=None, **hints)``.
 
+* Support for the syntax of ``{% cycle %}`` that uses comma-separated arguments
+  will be removed.
+
 .. _deprecation-removed-in-1.9:
 
 1.9

docs/ref/templates/builtins.txt

@@ -185,17 +185,17 @@ call to ``{% cycle %}`` doesn't specify ``silent``::
     {% cycle 'row1' 'row2' as rowcolors silent %}
     {% cycle rowcolors %}
 
-For backward compatibility, the ``{% cycle %}`` tag supports the much inferior
-old syntax from previous Django versions. You shouldn't use this in any new
-projects, but for the sake of the people who are still using it, here's what it
-looks like::
+.. deprecated:: 1.9
 
-    {% cycle row1,row2,row3 %}
+    The ``{% cycle %}`` tag supports the much inferior old syntax from previous
+    Django versions. You shouldn't use this in any new projects, but for the
+    sake of the people who are still using it, here's what it looks like::
 
-In this syntax, each value gets interpreted as a literal string, and there's no
-way to specify variable values. Or literal commas. Or spaces. Did we mention
-you shouldn't use this syntax in any new projects?
+        {% cycle row1,row2,row3 %}
 
+    In this syntax, each value gets interpreted as a literal string, and there's
+    no way to specify variable values, literal commas, or spaces. Support for
+    this syntax will be removed in Django 2.0.
 
 .. templatetag:: debug
 

docs/releases/1.9.txt

@@ -277,6 +277,19 @@ template tags that store results in a template variable. The
 ability, making the ``assignment_tag`` obsolete. Tags that use
 ``assignment_tag`` should be updated to use ``simple_tag``.
 
+``{% cycle %}`` syntax with comma-separated arguments
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The :ttag:`cycle` tag supports an inferior old syntax from previous Django
+versions:
+
+.. code-block:: html+django
+
+    {% cycle row1,row2,row3 %}
+
+Its parsing caused bugs with the current syntax, so support for the old syntax
+will be removed in Django 2.0 following an accelerated deprecation.
+
 Miscellaneous
 ~~~~~~~~~~~~~
 

tests/template_tests/syntax_tests/test_cycle.py

@@ -12,16 +12,19 @@ class CycleTagTests(SimpleTestCase):
         with self.assertRaises(TemplateSyntaxError):
             self.engine.get_template('cycle01')
 
+    @ignore_warnings(category=RemovedInDjango20Warning)
     @setup({'cycle02': '{% cycle a,b,c as abc %}{% cycle abc %}'})
     def test_cycle02(self):
         output = self.engine.render_to_string('cycle02')
         self.assertEqual(output, 'ab')
 
+    @ignore_warnings(category=RemovedInDjango20Warning)
     @setup({'cycle03': '{% cycle a,b,c as abc %}{% cycle abc %}{% cycle abc %}'})
     def test_cycle03(self):
         output = self.engine.render_to_string('cycle03')
         self.assertEqual(output, 'abc')
 
+    @ignore_warnings(category=RemovedInDjango20Warning)
     @setup({'cycle04': '{% cycle a,b,c as abc %}{% cycle abc %}{% cycle abc %}{% cycle abc %}'})
     def test_cycle04(self):
         output = self.engine.render_to_string('cycle04')
@@ -37,16 +40,19 @@ class CycleTagTests(SimpleTestCase):
         with self.assertRaises(TemplateSyntaxError):
             self.engine.get_template('cycle06')
 
+    @ignore_warnings(category=RemovedInDjango20Warning)
     @setup({'cycle07': '{% cycle a,b,c as foo %}{% cycle bar %}'})
     def test_cycle07(self):
         with self.assertRaises(TemplateSyntaxError):
             self.engine.get_template('cycle07')
 
+    @ignore_warnings(category=RemovedInDjango20Warning)
     @setup({'cycle08': '{% cycle a,b,c as foo %}{% cycle foo %}{{ foo }}{{ foo }}{% cycle foo %}{{ foo }}'})
     def test_cycle08(self):
         output = self.engine.render_to_string('cycle08')
         self.assertEqual(output, 'abbbcc')
 
+    @ignore_warnings(category=RemovedInDjango20Warning)
     @setup({'cycle09': '{% for i in test %}{% cycle a,b %}{{ i }},{% endfor %}'})
     def test_cycle09(self):
         output = self.engine.render_to_string('cycle09', {'test': list(range(5))})

tests/template_tests/syntax_tests/test_if_changed.py

@@ -124,14 +124,14 @@ class IfChangedTagTests(SimpleTestCase):
         self.assertEqual(output, '1-first,1-other,2-first,2-other,2-other,3-first,')
 
     @setup({'ifchanged-else02': '{% for id in ids %}{{ id }}-'
-                                '{% ifchanged id %}{% cycle red,blue %}{% else %}grey{% endifchanged %}'
+                                '{% ifchanged id %}{% cycle "red" "blue" %}{% else %}grey{% endifchanged %}'
                                 ',{% endfor %}'})
     def test_ifchanged_else02(self):
         output = self.engine.render_to_string('ifchanged-else02', {'ids': [1, 1, 2, 2, 2, 3]})
         self.assertEqual(output, '1-red,1-grey,2-blue,2-grey,2-grey,3-red,')
 
     @setup({'ifchanged-else03': '{% for id in ids %}{{ id }}'
-                                '{% ifchanged id %}-{% cycle red,blue %}{% else %}{% endifchanged %}'
+                                '{% ifchanged id %}-{% cycle "red" "blue" %}{% else %}{% endifchanged %}'
                                 ',{% endfor %}'})
     def test_ifchanged_else03(self):
         output = self.engine.render_to_string('ifchanged-else03', {'ids': [1, 1, 2, 2, 2, 3]})