🔧 add pre-comit config

.editorconfig

@@ -12,6 +12,10 @@ trim_trailing_whitespace = true
 indent_size = 4
 indent_style = tab
 
+[*.yaml]
+indent_size = 2
+indent_style = space
+
 [*.js]
 indent_size = 2
 

.pre-commit-config.yaml

@@ -0,0 +1,58 @@
+---
+# INSTALL .: `pre-commit install --overwrite --install-hooks`
+# UPDATE ..: `pre-commit autoupdate`
+default_language_version:
+  python: python3.8
+exclude: '\.svg$'
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.0.1
+    hooks:
+      # Generall Stuff
+      - id: trailing-whitespace
+      - id: mixed-line-ending
+        args:
+          - "--fix=lf"
+      - id: end-of-file-fixer
+      # VCS
+      - id: check-merge-conflict
+      # Config / Data Files
+      - id: check-yaml
+      # Python
+      - id: debug-statements
+      - id: requirements-txt-fixer
+  # Prettier (HTML, JS, CSS, Markdown…)
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v2.3.2
+    hooks:
+      - id: prettier
+        # exclude HTML templates (no Jinja2 support)
+        exclude: 'source/_templates/.*\.html'
+  # YAML
+  - repo: https://github.com/adrienverge/yamllint.git
+    rev: v1.26.1
+    hooks:
+      - id: yamllint
+  # Python: check syntax
+  - repo: https://github.com/pycqa/flake8
+    rev: 3.9.2
+    hooks:
+      - id: flake8
+        args:
+          - "--select=F"
+  # Python: reorder imports
+  - repo: https://github.com/asottile/reorder_python_imports
+    rev: v2.6.0
+    hooks:
+      - id: reorder-python-imports
+        args:
+          - "--application-directories=.:source"
+          - "--py38-plus"
+  # Python: lint with black
+  - repo: https://github.com/psf/black
+    rev: 21.7b0
+    hooks:
+      - id: black
+        args:
+          - "--line-length=88"
+          - "--target-version=py38"