feat: add tests and format code using ruff

.gitignore

@@ -12,3 +12,9 @@ venv
 result.txt
 testing/main.c
 */*compile_commands.json
+
+# Ignore clang-tools binaries
+clang-tidy-1*
+clang-tidy-2*
+clang-format-1*
+clang-format-2*

.pre-commit-config.yaml

@@ -13,8 +13,8 @@ repos:
     rev: v3.20.0
     hooks:
       - id: pyupgrade
-  - repo: https://github.com/pycqa/flake8
-    rev: '7.2.0'
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.12.1
     hooks:
-      - id: flake8
-        args: [--max-line-length=120]
+      - id: ruff
+      - id: ruff-format

cpp_linter_hooks/clang_format.py

@@ -12,7 +12,7 @@
 def run_clang_format(args=None) -> Tuple[int, str]:
     hook_args, other_args = parser.parse_known_args(args)
     path = ensure_installed("clang-format", hook_args.version)
-    command = [str(path), '-i']
+    command = [str(path), "-i"]
     command.extend(other_args)
 
     retval = 0

cpp_linter_hooks/clang_tidy.py

@@ -18,7 +18,7 @@ def run_clang_tidy(args=None) -> Tuple[int, str]:
     retval = 0
     output = ""
     try:
-        sp = subprocess.run(command, stdout=subprocess.PIPE, encoding='utf-8')
+        sp = subprocess.run(command, stdout=subprocess.PIPE, encoding="utf-8")
         retval = sp.returncode
         output = sp.stdout
         if "warning:" in output or "error:" in output:

cpp_linter_hooks/util.py

@@ -20,7 +20,7 @@ def is_installed(tool_name: str, version: str) -> Optional[Path]:
     """
     # check in current python prefix (usual situation when we installed into pre-commit venv)
     directory = Path(sys.executable).parent
-    path = (directory / f"{tool_name}-{version}")
+    path = directory / f"{tool_name}-{version}"
     if path.is_file():
         return path
 

tests/test_clang_format.py

@@ -5,13 +5,14 @@
 
 
 @pytest.mark.parametrize(
-    ('args', 'expected_retval'), (
-        (['--style=Google'], (0, "")),
-        (['--style=Google', '--version=16'], (0, "")),
-        (['--style=Google', '--version=17'], (0, "")),
-        (['--style=Google', '--version=18'], (0, "")),
-        (['--style=Google', '--version=19'], (0, "")),
-        (['--style=Google', '--version=20'], (0, "")),
+    ("args", "expected_retval"),
+    (
+        (["--style=Google"], (0, "")),
+        (["--style=Google", "--version=16"], (0, "")),
+        (["--style=Google", "--version=17"], (0, "")),
+        (["--style=Google", "--version=18"], (0, "")),
+        (["--style=Google", "--version=19"], (0, "")),
+        (["--style=Google", "--version=20"], (0, "")),
     ),
 )
 def test_run_clang_format_valid(args, expected_retval, tmp_path):
@@ -24,13 +25,19 @@ def test_run_clang_format_valid(args, expected_retval, tmp_path):
 
 
 @pytest.mark.parametrize(
-    ('args', 'expected_retval'), (
-        (['--style=Google',], 1),
-        (['--style=Google', '--version=16'], 1),
-        (['--style=Google', '--version=17'], 1),
-        (['--style=Google', '--version=18'], 1),
-        (['--style=Google', '--version=19'], 1),
-        (['--style=Google', '--version=20'], 1),
+    ("args", "expected_retval"),
+    (
+        (
+            [
+                "--style=Google",
+            ],
+            1,
+        ),
+        (["--style=Google", "--version=16"], 1),
+        (["--style=Google", "--version=17"], 1),
+        (["--style=Google", "--version=18"], 1),
+        (["--style=Google", "--version=19"], 1),
+        (["--style=Google", "--version=20"], 1),
     ),
 )
 def test_run_clang_format_invalid(args, expected_retval, tmp_path):
@@ -39,3 +46,21 @@ def test_run_clang_format_invalid(args, expected_retval, tmp_path):
 
     ret, _ = run_clang_format(args + [str(test_file)])
     assert ret == expected_retval
+
+
+@pytest.mark.parametrize(
+    ("args", "expected_retval"),
+    (
+        (
+            [
+                "--style=Google",
+            ],
+            1,
+        ),
+    ),
+)
+def test_run_clang_format_dry_run(args, expected_retval, tmp_path):
+    # copy test file to tmp_path to prevent modifying repo data
+    test_file = tmp_path / "main.c"
+    ret, _ = run_clang_format(["--dry-run", str(test_file)])
+    assert ret == -1  # Dry run should not fail

tests/test_clang_tidy.py

@@ -5,21 +5,22 @@
 from cpp_linter_hooks.clang_tidy import run_clang_tidy
 
 
-@pytest.fixture(scope='function')
+@pytest.fixture(scope="function")
 def generate_compilation_database():
-    subprocess.run(['mkdir', '-p', 'build'])
-    subprocess.run(['cmake', '-Bbuild', 'testing/'])
-    subprocess.run(['cmake', '-Bbuild', 'testing/'])
+    subprocess.run(["mkdir", "-p", "build"])
+    subprocess.run(["cmake", "-Bbuild", "testing/"])
+    subprocess.run(["cmake", "-Bbuild", "testing/"])
 
 
 @pytest.mark.parametrize(
-    ('args', 'expected_retval'), (
+    ("args", "expected_retval"),
+    (
         (['--checks="boost-*"'], 1),
-        (['--checks="boost-*"', '--version=16'], 1),
-        (['--checks="boost-*"', '--version=17'], 1),
-        (['--checks="boost-*"', '--version=18'], 1),
-        (['--checks="boost-*"', '--version=19'], 1),
-        (['--checks="boost-*"', '--version=20'], 1),
+        (['--checks="boost-*"', "--version=16"], 1),
+        (['--checks="boost-*"', "--version=17"], 1),
+        (['--checks="boost-*"', "--version=18"], 1),
+        (['--checks="boost-*"', "--version=19"], 1),
+        (['--checks="boost-*"', "--version=20"], 1),
     ),
 )
 def test_run_clang_tidy_valid(args, expected_retval):
@@ -32,13 +33,14 @@ def test_run_clang_tidy_valid(args, expected_retval):
 
 
 @pytest.mark.parametrize(
-    ('args', 'expected_retval'), (
+    ("args", "expected_retval"),
+    (
         (['--checks="boost-*"'], 1),
-        (['--checks="boost-*"', '--version=16'], 1),
-        (['--checks="boost-*"', '--version=17'], 1),
-        (['--checks="boost-*"', '--version=18'], 1),
-        (['--checks="boost-*"', '--version=19'], 1),
-        (['--checks="boost-*"', '--version=20'], 1),
+        (['--checks="boost-*"', "--version=16"], 1),
+        (['--checks="boost-*"', "--version=17"], 1),
+        (['--checks="boost-*"', "--version=18"], 1),
+        (['--checks="boost-*"', "--version=19"], 1),
+        (['--checks="boost-*"', "--version=20"], 1),
     ),
 )
 def test_run_clang_tidy_invalid(args, expected_retval, tmp_path):

tests/test_util.py

@@ -12,7 +12,6 @@
 
 @pytest.mark.parametrize(("tool", "version"), list(product(TOOLS, VERSIONS)))
 def test_ensure_installed(tool, version, tmp_path, monkeypatch, caplog):
-
     bin_path = tmp_path / "bin"
     with monkeypatch.context() as m:
         m.setattr(sys, "executable", str(bin_path / "python"))
@@ -31,11 +30,20 @@ def test_ensure_installed(tool, version, tmp_path, monkeypatch, caplog):
             assert (bin_path / f"{tool}-{bin_version}").is_file
 
             # first run should install
-            assert caplog.record_tuples[0][2] == f"Checking for {tool}, version {bin_version}"
+            assert (
+                caplog.record_tuples[0][2]
+                == f"Checking for {tool}, version {bin_version}"
+            )
             if run == 0:
                 # FIXME
                 # assert caplog.record_tuples[1][2] == f"Installing {tool}, version {bin_version}"
-                assert caplog.record_tuples[1][2] == f"{tool}, version {bin_version} is already installed"
+                assert (
+                    caplog.record_tuples[1][2]
+                    == f"{tool}, version {bin_version} is already installed"
+                )
             # second run should just confirm it's already installed
             else:
-                assert caplog.record_tuples[1][2] == f"{tool}, version {bin_version} is already installed"
+                assert (
+                    caplog.record_tuples[1][2]
+                    == f"{tool}, version {bin_version} is already installed"
+                )