Fixed #20189 -- Allowed customizing staticfiles ignored_patterns list

Thanks Tim Graham for the review.

django/contrib/staticfiles/apps.py

@@ -5,3 +5,4 @@ from django.utils.translation import ugettext_lazy as _
 class StaticFilesConfig(AppConfig):
     name = 'django.contrib.staticfiles'
     verbose_name = _("Static Files")
+    ignore_patterns = ['CVS', '.*', '*~']

django/contrib/staticfiles/management/commands/collectstatic.py

@@ -3,6 +3,7 @@ from __future__ import unicode_literals
 import os
 from collections import OrderedDict
 
+from django.apps import apps
 from django.contrib.staticfiles.finders import get_finders
 from django.contrib.staticfiles.storage import staticfiles_storage
 from django.core.files.storage import FileSystemStorage
@@ -74,7 +75,7 @@ class Command(BaseCommand):
         parser.add_argument(
             '--no-default-ignore', action='store_false',
             dest='use_default_ignore_patterns', default=True,
-            help="Don't ignore the common private glob-style patterns 'CVS', '.*' and '*~'.",
+            help="Don't ignore the common private glob-style patterns (defaults to 'CVS', '.*' and '*~').",
         )
 
     def set_options(self, **options):
@@ -88,7 +89,7 @@ class Command(BaseCommand):
         self.dry_run = options['dry_run']
         ignore_patterns = options['ignore_patterns']
         if options['use_default_ignore_patterns']:
-            ignore_patterns += ['CVS', '.*', '*~']
+            ignore_patterns += apps.get_app_config('staticfiles').ignore_patterns
         self.ignore_patterns = list(set(ignore_patterns))
         self.post_process = options['post_process']
 

docs/ref/contrib/staticfiles.txt

@@ -128,6 +128,24 @@ For a full list of options, refer to the commands own help by running::
 
    $ python manage.py collectstatic --help
 
+Customizing the ignored pattern list
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. versionadded:: 1.10
+
+The default ignored pattern list, ``['CVS', '.*', '*~']``, can be customized in
+a more persistent way than providing the ``--ignore`` command option at each
+``collectstatic`` invocation. Provide a custom :class:`~django.apps.AppConfig`
+class, override the ``ignore_patterns`` attribute of this class and specify
+that class path inside your :setting:`INSTALLED_APPS` setting:
+
+.. code-block:: python
+
+    from django.contrib.staticfiles.apps import StaticFilesConfig
+
+    class MyStaticFilesConfig(StaticFilesConfig):
+        ignore_patterns = [...]  # your custom ignore list
+
 ``findstatic``
 --------------
 

tests/staticfiles_tests/apps/staticfiles_config.py

@@ -0,0 +1,5 @@
+from django.contrib.staticfiles.apps import StaticFilesConfig
+
+
+class IgnorePatternsAppConfig(StaticFilesConfig):
+    ignore_patterns = ['*.css']

tests/staticfiles_tests/test_management.py

@@ -195,6 +195,20 @@ class TestCollectionExcludeNoDefaultIgnore(TestDefaults, CollectionTestCase):
         self.assertFileContains('test/CVS', 'should be ignored')
 
 
+@override_settings(INSTALLED_APPS=[
+    'staticfiles_tests.apps.staticfiles_config.IgnorePatternsAppConfig',
+    'staticfiles_tests.apps.test',
+])
+class TestCollectionCustomIgnorePatterns(CollectionTestCase):
+    def test_custom_ignore_patterns(self):
+        """
+        A custom ignore_patterns list, ['*.css'] in this case, can be specified
+        in an AppConfig definition.
+        """
+        self.assertFileNotFound('test/nonascii.css')
+        self.assertFileContains('test/.hidden', 'should be ignored')
+
+
 class TestCollectionDryRun(TestNoFilesCreated, CollectionTestCase):
     """
     Test ``--dry-run`` option for ``collectstatic`` management command.