Set baseline as cli arg

Makefile

@@ -26,5 +26,10 @@ lint:
 	poetry run flake8 ondivi tests
 	poetry run mypy ondivi tests --strict
 
-test:
-	poetry run pytest --cov=ondivi --cov-report=term-missing:skip-covered -vv
+test: unit it
+
+unit:
+	poetry run pytest tests/unit --cov=ondivi --cov-report=term-missing:skip-covered -vv
+
+it:  # integration tests
+	poetry run pytest tests/it -s -vv

README.md

@@ -27,6 +27,27 @@ Run the script:
 flake8 script.py | ondivi
 ```
 
+```bash
+ondivi -h
+```
+
+```
+usage: ondivi [-h] [--baseline BASELINE]
+
+Ondivi (Only diff violations).
+
+Python script filtering coding violations, identified by static analysis,
+only for changed lines in a Git repo.
+
+Usage example:
+
+flake8 script.py | ondivi
+
+optional arguments:
+  -h, --help           show this help message and exit
+  --baseline BASELINE  Commit or branch which will contain legacy code. Program filter out violations on baseline (default: "origin/master..HEAD")
+```
+
 ## How it Works
 
 The script parses the Git diff output to identify the changed lines in each file.

ondivi/__main__.py

@@ -26,6 +26,7 @@
 only for changed lines in a Git repo.
 """
 
+import argparse
 import sys
 from contextlib import suppress
 
@@ -99,13 +100,36 @@ def controller(diff: Diff, violations: list[str]) -> list[str]:
 
 def main() -> None:
     """Entrypoint."""
+    parser = argparse.ArgumentParser(
+        description='\n'.join([
+            'Ondivi (Only diff violations).\n',
+            'Python script filtering coding violations, identified by static analysis,',
+            'only for changed lines in a Git repo.\n',
+            'Usage example:\n',
+            'flake8 script.py | ondivi',
+        ]),
+        formatter_class=argparse.RawTextHelpFormatter,
+    )
+    parser.add_argument(
+        '--baseline',
+        dest='baseline',
+        type=str,
+        default='master',
+        help=' '.join([
+            'Commit or branch which will contain legacy code.',
+            'Program filter out violations on baseline',
+            '(default: "master")',
+        ]),
+    )
+    args = parser.parse_args()
     violations = sys.stdin.read().strip().splitlines()
     sys.stdout.write('\n'.join(
         controller(
-            Repo('.').git.diff('--unified=0', 'origin/master..HEAD'),
+            Repo('.').git.diff('--unified=0', args.baseline),
             violations,
         ),
     ))
+    sys.stdout.write('\n')
 
 
 if __name__ == '__main__':

pyproject.toml

@@ -43,6 +43,7 @@ pytest-cov = "5.0.0"
 mypy = "1.10.0"
 deltaver = "0.2.1"
 mutmut = "2.5.0"
+pytest-randomly = "3.15.0"
 
 [tool.isort]
 line_length = 120
@@ -61,6 +62,7 @@ ignore = [
   "ARG002",  # Unused method argument
   "D203",    # no-blank-line-before-class
   "D213",    # multi-line-summary-first-line
+  "D401",    # First line of docstring should be in imperative mood
   "D418",    # Function decorated with `@overload` shouldn't contain a docstring
   "FBT001",  # Boolean-typed positional argument in function definition
   "FBT002",  # Boolean-typed positional argument in function definition

tests/it/test_app.py

@@ -0,0 +1,81 @@
+# The MIT License (MIT).
+#
+# Copyright (c) 2024 Almaz Ilaletdinov <[email protected]>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
+# OR OTHER DEALINGS IN THE SOFTWARE.
+
+"""Integration test with installing and check on real git repo."""
+
+import os
+import subprocess
+import zipfile
+from pathlib import Path
+
+import pytest
+from _pytest.legacypath import TempdirFactory
+
+
+@pytest.fixture(scope='module')
+def current_dir() -> Path:
+    """Current directory for installing actual ondivi."""
+    return Path().absolute()
+
+
+# flake8: noqa: S603, S607. Not a production code
+@pytest.fixture(scope='module')
+def _test_repo(tmpdir_factory: TempdirFactory, current_dir: str) -> None:
+    """Real git repository."""
+    tmp_path = tmpdir_factory.mktemp('test')
+    with zipfile.ZipFile('tests/fixtures/ondivi-test-repo.zip', 'r') as zip_ref:
+        zip_ref.extractall(tmp_path)
+    os.chdir(tmp_path / 'ondivi-test-repo')
+    subprocess.run(['python', '-m', 'venv', 'venv'], check=True)
+    subprocess.run(['venv/bin/pip', 'install', 'flake8', str(current_dir)], check=True)
+
+
+@pytest.mark.usefixtures('_test_repo')
+def test() -> None:
+    """Test script with real git repo."""
+    got = subprocess.run(
+        ['ondivi', '--baseline', '56faa56'],
+        stdin=subprocess.Popen(
+            ['venv/bin/flake8', 'file.py'],
+            stdout=subprocess.PIPE,
+        ).stdout,
+        stdout=subprocess.PIPE,
+        check=False,
+    ).stdout.decode('utf-8').strip()
+
+    assert got == 'file.py:4:80: E501 line too long (119 > 79 characters)'
+
+
+@pytest.mark.usefixtures('_test_repo')
+def test_baseline_default() -> None:
+    """Test baseline default."""
+    got = subprocess.run(
+        ['ondivi'],
+        stdin=subprocess.Popen(
+            ['venv/bin/flake8', 'file.py'],
+            stdout=subprocess.PIPE,
+        ).stdout,
+        stdout=subprocess.PIPE,
+        check=False,
+    ).stdout.decode('utf-8').strip()
+
+    assert got == 'file.py:4:80: E501 line too long (119 > 79 characters)'