port-feat: pre-commit config added from the v3 workstream (#117)

Changes partially taken from this change: a56091c

Requires additional work when the django-cms 4.0 workstream is official, the version bump code has been ignored because it would generate official releases only: #116

.pre-commit-config.yaml

@@ -0,0 +1,35 @@
+repos:
+# Need to drop python 3.5 and 3.6 before we include python upgrade
+#  - repo: https://github.com/asottile/pyupgrade
+#    rev: v2.31.0
+#    hooks:
+#      - id: pyupgrade
+#        args: ["--py37-plus"]
+#
+# FIXME: Should be enabled for codebases that are minimum django 2.2+
+#  - repo: https://github.com/adamchainz/django-upgrade
+#    rev: '1.4.0'
+#    hooks:
+#      - id: django-upgrade
+#        args: [--target-version, "2.2"]
+
+  - repo: https://github.com/PyCQA/flake8
+    rev: 4.0.1
+    hooks:
+      - id: flake8
+
+  - repo: https://github.com/asottile/yesqa
+    rev: v1.3.0
+    hooks:
+      - id: yesqa
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.1.0
+    hooks:
+      - id: check-merge-conflict
+      - id: mixed-line-ending
+
+  - repo: https://github.com/pycqa/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort

CHANGELOG.rst

@@ -4,6 +4,7 @@ Changelog
 
 Unreleased
 ==========
+* port-feat: pre-commit config added from the v3 workstream
 * fix: Added test coverage to admin preview view
 
 4.0.0.dev4 (2022-02-03)

djangocms_snippet/admin.py

@@ -142,12 +142,12 @@ def preview_view(self, request, snippet_id=None, form_url='', extra_context=None
     def get_urls(self):
         info = self.model._meta.app_label, self.model._meta.model_name
         return [
-           url(
+            url(
                    r"^(?P<snippet_id>\d+)/preview/$",
                    self.admin_site.admin_view(self.preview_view),
                    name="{}_{}_preview".format(*info),
-               ),
-           ] + super().get_urls()
+            ),
+        ] + super().get_urls()
 
     def has_delete_permission(self, request, obj=None):
         """

tests/test_plugins.py

@@ -5,9 +5,10 @@
 from cms.test_utils.testcases import CMSTestCase
 from cms.toolbar.utils import get_object_edit_url, get_object_structure_url
 
-from djangocms_snippet.models import Snippet, SnippetGrouper
 from djangocms_versioning.models import Version
 
+from djangocms_snippet.models import Snippet, SnippetGrouper
+
 from .utils.factories import SnippetWithVersionFactory
 
 

tests/utils/factories.py

@@ -6,11 +6,8 @@
 from cms.models import Placeholder
 
 import factory
-from factory.fuzzy import (
-    FuzzyInteger,
-    FuzzyText,
-)
 from djangocms_versioning.models import Version
+from factory.fuzzy import FuzzyInteger, FuzzyText
 
 from djangocms_snippet.models import Snippet, SnippetGrouper, SnippetPtr