Add extra configuration to a new Python project

prep-python.py

#!/usr/bin/env python

import sys
from pathlib import Path

if not Path("pyproject.toml").exists():
    print(
        "Ensure you did:\n  uv init --app --package\n  or uv init --app",
        file=sys.stderr,
    )
    sys.exit(1)

archives = [
    {
        "name": ".vscode/settings.json",
        "data": """
{
  "editor.rulers": [ 80, 88 ],
  "[python]": {
    "editor.defaultFormatter": "charliermarsh.ruff",
    "editor.formatOnSave": true,
    "editor.codeActionsOnSave": {
      "source.fixAll": "explicit",
      "source.organizeImports": "explicit",
    },
  },
  "mypy-type-checker.args": [
    "--disallow-untyped-defs"
  ],
}
        """.strip(),
    },
    {
        "name": ".vscode/extensions.json",
        "data": """
{
  "recommendations": [
    "ms-python.python",
    "charliermarsh.ruff",
    "ms-python.mypy-type-checker"
  ],
}
        """.strip(),
    },
]

for archive_item in archives:
    new_file = Path(archive_item["name"])
    new_file_dir = new_file.parent

    new_file_dir.mkdir(parents=True, exist_ok=True)

    if new_file.exists():
        print(f"File already exists: {new_file}\nAborted.", file=sys.stderr)
        sys.exit(1)

    with new_file.open("w") as f:
        f.write(archive_item["data"])
        print(f"Created: {new_file}")

pyproject_extra_config = """
[tool.ruff]
# Same as Black default values
line-length = 88
indent-width = 4

# Assume Python 3.12 or later
target-version = "py312"

[tool.ruff.lint]
select = ["ALL"]
ignore = [
    "D100", # undocumented-public-module
    "D203", # one-blank-line-before-class
    "D213", # multi-line-summary-second-line
    "T201", # print
    "T203", # p-print
]
fixable = ["ALL"]
unfixable = []

[tool.ruff.lint.per-file-ignores]
# Ignore unused imports and lack of docstrings in __init__.py
# Unused imports in __init__.py might be part of the public interface
# or trigger side effects.
"__init__.py" = ["F401", "D"]

[tool.ruff.format]
# Same as Black default values
quote-style = "double"
indent-style = "space"
skip-magic-trailing-comma = false
line-ending = "auto"
"""

pyproject_toml = Path("pyproject.toml")
with pyproject_toml.open("a") as f:
    f.write(pyproject_extra_config)

print("Updated: pyproject.toml")
print("Done.")