Add a cookbook full of wonderful recipes (#33)

Author: codingjoe

COOKBOOK.md

@@ -0,0 +1,106 @@
+# reLint Cookbook
+
+A collection of recipes for reLint. Please feel free to contribute!
+
+# Table of Contents
+
+- [Python](#python)
+  - [Django](#django)
+- [HTML](#html)
+
+# Python
+
+## Django
+
+### Databases
+
+```yaml
+- name: potential database connection limit with use of threading # by @syphar
+  pattern: "(threading|ThreadPoolExecutor)[^#]*(?!\\s+# noqa)$"
+  hint: |
+    When using threads, keep in mind that they might use additional database
+    connections. This can lead to a connection limit being reached. You may
+    also need to manually close the database connection in the thread.
+  filePattern: .*\.py
+```
+
+### Utils
+
+```yaml
+- name: Do not import datetime or date directly # by @codingjoe
+  pattern: '(from datetime import|from django.utils.timezone import)'
+  filePattern: .*\.py
+  hint: |
+    To differentiate between naive and timezone-aware dates,
+    please use the following imports:
+     * 'from django.utils import timezone'
+     * 'import datetime'
+```
+
+### Management Commands
+
+```yaml
+- name: No logger in management commands # by @codingjoe
+  pattern: (logger|import logging)
+  hint: Please write to self.stdout or self.stderr in favor of using a logger.
+  filePattern: \/management\/commands\/.*\.py
+```
+
+### Testing
+
+#### PyTest-Django
+
+```yaml
+- name: Code and tests seem too complex # by @codingjoe
+  pattern: '(pytest\.fixture|def (?!test_)).*(?!\\s+# noqa)$'
+  hint: |
+    Large test setups hint towards complex or convoluted production code.
+    Consider breaking down your code into smaller individually testable chunks.
+    You may also use pytest fixtures inside a conftest.py file. Their usage should
+    be limited to technical setups, like stubs or IO mocks. Data fixtures should
+    be implemented via baker recipes only.
+  filePattern: '.*\/test_.*\.py'
+```
+
+```yaml
+- name: IO is lava – Avoid using database fixtures # by @codingjoe
+  pattern: '@pytest.fixture.*\n[ ]*def [^(]+\([^)]*(db|transactional_db)(, |\))'
+  hint: Please use the "django_db" marker on individual tests only.
+  filePattern: .*\.py
+```
+
+```yaml
+- name: IO is lava – Avoid the 'db' fixture # by @codingjoe
+  pattern: "def test_[^(]+\\([^)]*db[^)]*\\):"
+  hint: Please use the "django_db" marker instead.
+  filePattern: .*\.py
+```
+
+```yaml
+- name: IO is lava – Do not mark a whole test class for database usage # by @codingjoe
+  pattern: \@pytest\.mark\.django_db[^\n]*\n\w*class
+  hint: Please use the "django_db" marker on individual tests only.
+  filePattern: .*\.py
+```
+
+#### Model Bakery
+
+```yaml
+- name: Follow the recipe # by @codingjoe
+  pattern: 'baker\.(make|prepare)\('
+  filePattern: '.*\/test_.*\.py'
+  hint: |
+    Please use baker recipes instead of `baker.make` or `baker.prepare`.
+    This allows us to easily create complex objects with a single line of code.
+```
+
+# HTML
+
+```yaml
+- name: no inline CSS # by @codingjoe
+  pattern: 'style=\"[^\"]*;[^\"]+\"'
+  hint: |
+    Please do not use more than one inline style attribute.
+    You may use a CSS class instead.
+  filePattern: .*\.(html|vue|jsx|tsx)
+```

README.md

@@ -16,6 +16,8 @@
 python3 -m pip install relint
 ```
 
+## [Examples & Recipes – The reLint Cookbook](COOKBOOK.md)
+
 ## Usage
 
 You can write your own regular rules in a YAML file, like so:
@@ -90,27 +92,3 @@ following entry to your `.pre-commit-config.yaml`:
     - id: relint
       args: [-W]  # optional, if you want to fail on warnings during commit
 ```
-
-## Samples
-
-```yaml
-- name: db fixtures
-  pattern: 'def test_[^(]+\([^)]*(customer|product)(, |\))'
-  hint: Use model_bakery recipes instead of db fixtures.
-  filePattern: test_.*\.py
-
-- name: model_bakery recipes
-  pattern: baker\.make\(
-  hint: Please use baker.make_recipe instead of baker.make.
-  filePattern: (test_.*|conftest)\.py
-
-- name: the database is lava
-  pattern: '@pytest.fixture.*\n[ ]*def [^(]+\([^)]*(db|transactional_db)(, |\))'
-  hint: Please do not create db fixtures but model_bakery recipes instead.
-  filePattern: .*\.py
-
-- name: No logger in management commands
-  pattern: (logger|import logging)
-  hint: Please write to self.stdout or self.stderr in favor of using a logger.
-  filePattern: \/management\/commands\/.*\.py
-```