feat: Introduce isort and Python-based code quality tools (#446)

pyproject.toml

@@ -56,6 +56,7 @@ dev = [
   "pylint",
   "mypy",
   "pyright",
+  "isort>=5.13.2",
   # security:
   "bandit",
   # packaging:
@@ -83,8 +84,8 @@ app     = "python -m kleinanzeigen_bot"
 compile.cmd = "python -O -m PyInstaller pyinstaller.spec --clean"
 compile.env = {PYTHONHASHSEED = "1", SOURCE_DATE_EPOCH = "0"}  # https://pyinstaller.org/en/stable/advanced-topics.html#creating-a-reproducible-build
 debug   = "python -m pdb -m kleinanzeigen_bot"
-format  = "autopep8 --recursive --in-place src tests --verbose"
+format  = "python -m scripts.format_code"
-lint    = {shell = "pylint -v src tests && autopep8 -v --exit-code --recursive --diff src tests && mypy" }
+lint    = "python -m scripts.lint_code"
 audit   = "bandit -c pyproject.toml -r src"
 test    = "python -m pytest --capture=tee-sys -v"
 utest   = "python -m pytest --capture=tee-sys -v -m 'not itest'"
@@ -266,3 +267,15 @@ filterwarnings = [
   "ignore:Exception ignored in:pytest.PytestUnraisableExceptionWarning",
   "ignore::DeprecationWarning"
 ]
+
+# Add isort configuration to format imports
+[tool.isort]
+profile = "black"
+line_length = 160
+combine_as_imports = true
+combine_star = true
+multi_line_output = 3
+force_grid_wrap = 0
+ensure_newline_before_comments = true
+no_lines_before = ["LOCALFOLDER"]
+combine_straight_imports = true

scripts/__init__.py

@@ -0,0 +1 @@
+"""Helper scripts for development tasks."""

scripts/format_code.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+"""Helper script to format Python code using isort and autopep8."""
+
+import subprocess, sys
+
+from scripts.git_utils import get_modified_python_files
+
+
+def format_files() -> int:
+    """Format Python files using isort and autopep8.
+
+    Returns:
+        int: 0 on success, non-zero on failure
+    """
+    try:
+        # Format imports in modified files
+        py_files = get_modified_python_files()
+        if py_files:
+            subprocess.run(['isort', *py_files], check=True)
+
+        # Format all files with autopep8
+        subprocess.run(
+            ['autopep8', '--recursive', '--in-place', 'src', 'tests', '--verbose'],
+            check=True
+        )
+        return 0
+    except subprocess.CalledProcessError as e:
+        print(f"Error during formatting: {e}", file=sys.stderr)
+        return 1
+
+
+if __name__ == '__main__':
+    sys.exit(format_files())

scripts/git_utils.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+"""Utility functions for git operations."""
+
+import subprocess
+from collections.abc import Sequence
+
+
+def get_modified_python_files() -> Sequence[str]:
+    """Get list of modified Python files from git.
+
+    Returns:
+        Sequence[str]: List of modified Python file paths
+    """
+    git_cmd = ['git', 'diff', '--name-only', '--diff-filter=ACMR', 'HEAD']
+    result = subprocess.run(git_cmd, capture_output=True, text=True, check=True)
+    if not result.stdout.strip():
+        return []
+    return [f for f in result.stdout.splitlines() if f.endswith('.py')]

scripts/lint_code.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+"""Helper script to lint Python code using multiple tools."""
+
+import subprocess, sys
+from collections.abc import Sequence
+
+from scripts.git_utils import get_modified_python_files
+
+
+def run_tool(cmd: Sequence[str], tool_name: str) -> tuple[int, str]:
+    """Run a lint tool and return its exit code and error message.
+
+    Args:
+        cmd: Command to run as list of strings
+        tool_name: Name of the tool for error messages
+
+    Returns:
+        tuple[int, str]: tuple of (exit_code, error_message)
+    """
+    try:
+        subprocess.run(list(cmd), check=True)
+        return 0, ""
+    except subprocess.CalledProcessError as e:
+        return e.returncode, f"{tool_name} fehlgeschlagen\n"
+
+
+def lint_files() -> int:
+    """Run all linting tools.
+
+    Returns:
+        int: Number of errors encountered
+    """
+    errors = 0
+    error_messages = []
+
+    # Run isort on modified files
+    py_files = get_modified_python_files()
+    if py_files:
+        code, msg = run_tool(['isort', *py_files], 'isort')
+        errors += code
+        if msg:
+            error_messages.append(msg)
+
+    # Run other linting tools
+    tools = [
+        (['pylint', '-v', 'src', 'tests'], 'pylint'),
+        (['autopep8', '-v', '--in-place', '--recursive', 'src', 'tests'], 'autopep8'),
+        (['mypy', 'src', 'tests'], 'mypy')
+    ]
+
+    for cmd, name in tools:
+        code, msg = run_tool(cmd, name)
+        errors += code
+        if msg:
+            error_messages.append(msg)
+
+    # Print all error messages at the end
+    if error_messages:
+        print("\n".join(error_messages), file=sys.stderr)
+
+    return errors
+
+
+if __name__ == '__main__':
+    sys.exit(lint_files())