Closes #720

.importlinter

@@ -0,0 +1,84 @@
+[importlinter]
+root_package = wemake_python_styleguide
+include_external_packages = True
+
+
+[importlinter:contract:layers]
+name = Layered architecture of our linter
+type = layers
+
+containers =
+  wemake_python_styleguide
+
+layers =
+  checker
+  transformations
+  presets
+  visitors
+  violations
+  logic
+  compat
+  options
+  constants
+  types
+
+
+# TODO: provide independence contract for visitors
+[importlinter:contract:violation-independence]
+name = Independence contract for violations (all shall be free!)
+type = independence
+
+modules =
+  wemake_python_styleguide.violations.naming
+  wemake_python_styleguide.violations.complexity
+  wemake_python_styleguide.violations.consistency
+  wemake_python_styleguide.violations.best_practices
+  wemake_python_styleguide.violations.refactoring
+  wemake_python_styleguide.violations.oop
+
+
+[importlinter:contract:flake8-independence]
+name = Independence contract for flake8 API (all shall be free!)
+type = independence
+
+modules =
+  wemake_python_styleguide.checker
+  wemake_python_styleguide.formatter
+
+
+[importlinter:contract:api-restrictions]
+name = Forbids to import anything from dependencies
+type = forbidden
+
+source_modules =
+  wemake_python_styleguide
+
+forbidden_modules =
+  # Important direct and indirect dependencies:
+  flake8
+  pygments
+  isort
+  bandit
+  eradicate
+  pydocstyle
+  pycodestyle
+  mccabe
+  radon
+
+ignore_imports =
+  # These modules must import from flake8 to provide required API:
+  wemake_python_styleguide.checker -> flake8
+  wemake_python_styleguide.formatter -> flake8
+  wemake_python_styleguide.formatter -> pygments
+  wemake_python_styleguide.options.config -> flake8
+
+
+[importlinter:contract:tests-restrictions]
+name = Explicit import restrictions for tests
+type = forbidden
+
+source_modules =
+  wemake_python_styleguide
+
+forbidden_modules =
+  tests

CONTRIBUTING.md

@@ -75,13 +75,14 @@ These steps are mandatory during the CI.
 
 ## Architecture
 
-We use [layer-lint](https://layer-linter.readthedocs.io/en/latest/usage.html)
+We use [import-linter](https://import-linter.readthedocs.io)
 to enforce strict layered architecture.
 
 ```bash
-layer-lint wemake_python_styleguide
+lint-imports
 ```
 
+See `.importlinter` file for contracts definition.
 All contracts must be valid for each commit.
 This step is mandatory during the CI.
 
@@ -141,7 +142,7 @@ Before submitting your code please do the following steps:
 7. Run `pytest` again to make sure it is still working
 8. Run `mypy` to ensure that types are correct
 9. Run `flake8` to ensure that style is correct
-10. Run `layer-lint` to ensure that architecture contracts are correct
+10. Run `lint-imports` to ensure that architecture contracts are correct
 11. Run `doc8` to ensure that docs are correct
 12. Run `xenon` to ensure that code quality is `A` (good enough)
 

Makefile

@@ -6,7 +6,7 @@ lint:
 	flake8 .
 	autopep8 -r . --diff --exclude=./tests/fixtures/** --exit-code
 	xenon --max-absolute B --max-modules A --max-average A wemake_python_styleguide
-	layer-lint --quiet wemake_python_styleguide
+	lint-imports
 	poetry run doc8 -q docs
 
 .PHONY: unit

docs/pages/api/index.rst

@@ -68,8 +68,8 @@ to understand how all components are bound together.
 We use a `layered architecture <https://layer-linter.readthedocs.io/en/stable/concepts.html>`_
 that follows this contract:
 
-.. literalinclude :: ../../../layers.yml
-   :language: yaml
+.. literalinclude :: ../../../.importlinter
+   :language: ini
 
 Contributing
 ------------

pyproject.toml

@@ -93,6 +93,6 @@ m2r = "^0.2"
 added-value = "^0.14"
 tomlkit = "^0.5"
 safety = "^1.8"
-layer-linter = "^0.12.3"
 autopep8 = "^1.4"
 xenon = "^0.5.5"
+import-linter = {version = "1.0b4", allows-prereleases = true}