Development

Set up the contributor environment and run lint, test, and CI checks locally so you can submit clean PRs.

Prepare the contributor environment

just setup

This runs uv sync, vale sync, and configures git config core.hooksPath .hooks.

Daily development commands

Command	What it does
just setup	Install deps, sync vale, configure hooks
just check	Run all pre-commit checks
just fix	Auto-fix lint and format issues
just test	Run tests (pass args: just test -v -k blob)
just cov	Run tests with coverage report
just ci	Full local CI: check + test
just lint	ruff lint only
just fmt	ruff format only
just typecheck	pyright only
just docs-serve	Serve docs locally
just docs-build	Build docs to site/
just docs-deploy	Deploy docs to GitHub Pages

What the git hooks run

Hooks live in .hooks/ (tracked in git). They are activated by just setup via git config core.hooksPath .hooks.

Pre-commit runs:

1. ruff check — lint (pycodestyle, pyflakes, isort, bugbear, and more)
2. ruff format --check — format verification
3. pyright — static type checking on src/
4. typos — spell checking
5. vale — prose linting on src/, tests/, README.md

Pre-push runs:

1. pytest — full test suite

What CI checks on every push

GitHub Actions runs on push and PR to main:

• lint — ruff + pyright
• typos — spell check
• vale — prose lint
• test — pytest across Python 3.11, 3.12, 3.13

Code-style rules

• Line length: 100
• Lint rules: E, W, F, I, UP, B, SIM, RUF (see pyproject.toml)
• Type checking: pyright in standard mode
• Enum style: StrEnum (not str, Enum)
• Immutability: model_copy(update={...}) instead of mutation

Testing expectations

• All code must have tests
• Target: 100% line coverage
• Tests use pytest with pytest-cov
• Edge cases and error paths must be covered
• Parametrize related cases (see test_terminal_states_reject_all_transitions)

TDD flow for a new module

1. Create src/elegua/mymodule.py
2. Create tests/test_mymodule.py with failing tests (red)
3. Implement until tests pass (green)
4. Run just check to verify lint, types, and prose
5. Run just cov to verify coverage stays at 100%