Added editorconfig, black, flake8, isort, pre-commit

.editorconfig

@@ -0,0 +1,20 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+# Set max line length
+# 4 space indentation
+[*.py]
+charset = utf-8
+max_line_length = 79
+indent_style = space
+indent_size = 4

.flake8

@@ -0,0 +1,23 @@
+[flake8]
+max-line-length = 79
+select = C,E,F,W,B,B950
+ignore =
+    # black https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html#line-length
+    E203, E501
+    # There's nothing wrong with assigning lambdas
+    E731,
+    # PEP8 weakly recommends Knuth-style line breaks before binary
+    # operators
+    W503, W504
+exclude =
+    # These are directories that it's a waste of time to traverse
+    .git,
+    .tox,
+    .venv,
+    docs,
+    venv,
+
+    # Generated migration files will throw errors. We need to find a way
+    # to exclude django-generated migrations while including
+    # manually-written migrations.
+    */migrations/*.py,

.gitignore

@@ -70,3 +70,6 @@ bower_components/
 .grunt/
 src/vendor/
 dist/
+
+# IDEs
+.idea/

.pre-commit-config.yaml

@@ -0,0 +1,18 @@
+repos:
+-   repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+    - id: black
+      args: ["treemodeladmin", "setup.py", "--line-length=79"]
+      exclude: migrations
+-   repo: https://gitlab.com/pycqa/flake8
+    rev: 4.0.1
+    hooks:
+    - id: flake8
+      additional_dependencies: [flake8-bugbear==22.1.11]
+-   repo: https://github.com/pycqa/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort
+        name: isort (python)
+        args: ["treemodeladmin"]

pyproject.toml

@@ -20,5 +20,22 @@ exclude = '''
 )
 '''
 
+[tool.isort]
+profile = "black"
+line_length = 79
+lines_after_imports = 2
+skip = [".tox", "migrations", ".venv", "venv"]
+known_django = ["django"]
+known_wagtail = ["wagtail"]
+default_section = "THIRDPARTY"
+sections = [
+    "STDLIB",
+    "DJANGO",
+    "WAGTAIL",
+    "THIRDPARTY",
+    "FIRSTPARTY",
+    "LOCALFOLDER"
+]
+
 [build-system]
 requires = ["setuptools", "wheel"]

treemodeladmin/tests/urls.py

@@ -4,7 +4,8 @@
 try:
     from django.urls import include, re_path
 except ImportError:
-    from django.conf.urls import include, url as re_path
+    from django.conf.urls import include
+    from django.conf.urls import url as re_path
 
 
 urlpatterns = [