ENH: Refactor code linter and formatter dependencies

Refactor code linter and formatter dependencies:
- Remove `black`, `flake8` and `isort` dependencies from
  `pyproject.toml`: the role has been taken over by `ruff` in commit
  81b3690.
- Transfer the `black` and `isort` rules left behind to `ruff` in
  `pyproject.toml`
- Remove `black`, `flake8` and `isort` from the pre-commit config file
  and use `ruff` instead.

Set explicitly `eddymotion` as the known first party so that the
`import` statements corresponding to `eddymotion` are separated by a
blank line from third-party package `import` statements.

Add `--diff` to the `ruff check` command in the contribution checks
GitHub Actions workflow so that the differences that need to be applied
are actually shown on GitHub.

.github/workflows/contrib.yml

@@ -20,4 +20,4 @@ jobs:
         with:
           python-version: 3
       - name: Lint EddyMotion
-        run: pipx run ruff check
+        run: pipx run ruff check --diff

.pre-commit-config.yaml

@@ -10,15 +10,9 @@ repos:
       - id: trailing-whitespace
       - id: end-of-file-fixer
       - id: debug-statements
-  - repo: https://github.com/timothycrosley/isort
-    rev: 5.10.1
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.3.4
     hooks:
-      - id: isort
-  - repo: https://github.com/psf/black
-    rev: 22.3.0
-    hooks:
-      - id: black
-  - repo: https://github.com/pycqa/flake8
-    rev: 4.0.1
-    hooks:
-      - id: flake8
+      - id: ruff
+        args: [ --fix ]
+      - id: ruff-format

pyproject.toml

@@ -57,10 +57,7 @@ doc = [
 ]
 
 dev = [
-    "black",
-    "flake8",
-    "flake8-pyproject",
-    "isort",
+    "ruff",
     "pre-commit",
     "pre-commit-hooks",
 ]
@@ -113,32 +110,21 @@ version-file = "src/eddymotion/_version.py"
 # Developer tool configurations
 #
 
-[tool.black]
-line-length = 99
-target-version = ['py39']
-skip-string-normalization = true
-exclude = '''
-# Directories
-/(
-    \.eggs
-  | \.git
-  | \.hg
-  | \.mypy_cache
-  | \.tox
-  | \.venv
-  | venv
-  | _build
-  | build
-  | dist
-)/
-'''
-
-[tool.isort]
-profile = 'black'
-skip_gitignore = true
-
 [tool.ruff]
 line-length = 99
+target-version = "py39"
+exclude = [
+  ".eggs",
+  ".git",
+  ".hg",
+  ".mypy_cache",
+  ".tox",
+  ".venv",
+  "venv",
+  "_build",
+  "build",
+  "dist",
+]
 
 [tool.ruff.lint]
 select = [
@@ -147,6 +133,7 @@ select = [
   "C",
   "W",
   "B",
+  "I",
 ]
 ignore = [
   "E203"
@@ -164,6 +151,9 @@ inline-quotes = "double"
 [tool.ruff.format]
 quote-style = "double"
 
+[tool.ruff.lint.isort]
+known-first-party=["eddymotion"]
+
 [tool.pytest.ini_options]
 pythonpath = "src/ test/"
 norecursedirs = [".*", "_*"]