style: replace black, isort, flake8 and autoflake with ruff

.pre-commit-config.yaml

@@ -1,29 +1,16 @@
 fail_fast: true
 repos:
-  - repo: local
-    hooks:
-      - id: black
-        name: Black
-        entry: uv run --no-sync black docling_core test
-        pass_filenames: false
-        language: system
-        files: '\.py$'
-  - repo: local
-    hooks:
-      - id: isort
-        name: isort
-        entry: uv run --no-sync isort docling_core test
-        pass_filenames: false
-        language: system
-        files: '\.py$'
-  - repo: local
-    hooks:
-      - id: autoflake
-        name: autoflake
-        entry: uv run --no-sync autoflake docling_core test
-        pass_filenames: false
-        language: system
-        files: '\.py$'
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.11.5
+    hooks:
+      - id: ruff-format
+        name: "Ruff formatter"
+        args: [--config=pyproject.toml]
+        files: '^(docling_core|tests|docs/examples).*\.(py|ipynb)$'
+      - id: ruff
+        name: "Ruff linter"
+        args: [--exit-non-zero-on-fix, --fix, --config=pyproject.toml]
+        files: '^(docling_core|tests|docs/examples).*\.(py|ipynb)$'
   - repo: local
     hooks:
       - id: mypy
@@ -32,14 +19,6 @@ repos:
         pass_filenames: false
         language: system
         files: '\.py$'
-  - repo: local
-    hooks:
-      - id: flake8
-        name: Flake8
-        entry: uv run --no-sync flake8 docling_core
-        pass_filenames: false
-        language: system
-        files: '\.py$'
   - repo: local
     hooks:
       - id: pytest

CONTRIBUTING.md

@@ -47,8 +47,7 @@ uv add [OPTIONS] <PACKAGES|--requirements <REQUIREMENTS>>
 
 We use the following tools to enforce code style:
 
-- isort, to sort imports
-- Black, to format code
+- Ruff, to format and lint code
 - Flake8, to lint code
 - autoflake, to remove unused variables and imports
 - [MyPy](https://mypy.readthedocs.io), as static type checker
@@ -65,9 +64,6 @@ To run the checks on-demand, type:
 uv run pre-commit run --all-files
 ```
 
-Note: Checks like `Black` and `isort` will _fail_ if they modify files. This is because `pre-commit` doesn't like to see files modified by their hooks. In these cases, `git add` the modified files and `git commit` again.
-
-
 ### Documentation
 
 We use [JSON Schema for Humans](https://github.com/coveooss/json-schema-for-humans) to generate Markdown pages documenting the JSON schema of the Docling objects.