nuntius/CONTRIBUTING.md

# Contributing

Contributions to **nuntius** are governed by the Contributor terms
below; submitting one means you accept them.

## Contributor terms

1. This project belongs to its owner alone. The owner decides what is
   accepted, in what form and when; the decision is final and needs no
   justification.
2. By submitting a contribution you assign to Petr Balvín
   <opensource@petrbalvin.org> all present and future copyright and
   related rights in it, worldwide, for the full term of the rights,
   with the right to relicense and sublicense without restriction,
   including under proprietary terms.
3. Where that assignment is not effective, it counts as a perpetual,
   irrevocable, royalty-free licence with the same scope.
4. To the fullest extent permitted by law, you waive any right of
   attribution and integrity in the contribution. The project names no
   contributors and keeps no credits list.
5. By submitting you represent that the work is yours and that you
   hold the rights to assign it as above.

## Development setup

Requirements: Go 1.27.1 (the version recorded in `go.mod`), and
[just](https://github.com/casey/just) for the recipes. The race detector in
`just gates` needs a C compiler, so gcc must be installed. nuntius builds
and tests on Linux and FreeBSD.

```sh
git clone https://sourcedock.dev/petrbalvin/nuntius.git
cd nuntius
just build
just test
```

The automated suite is hermetic: the SMTP tests run against in-process fake
servers and the storage tests against temporary directories, so no network
or SMTP account is needed to develop. A local SMTP account only matters for
manual end-to-end checks.

## Workflow

1. Branch from `development`. Never commit directly to `main`, which is release-only.
2. Commit in [Conventional Commits](https://www.conventionalcommits.org/) form:
   `type(scope): description`, subject line only, imperative mood, lowercase after the
   colon, no trailing full stop. Allowed types: `feat`, `fix`, `docs`, `style`,
   `refactor`, `perf`, `test`, `chore`, `ci`, `build`, `revert`.
3. One logical change per commit. A refactor, a behaviour change and a formatting pass
   are three commits, never one.
4. Record every user-visible change in `CHANGELOG.md` under `## [development]`.
5. Add or update tests. Coverage stays at 80 percent or more; it is a hard gate.
6. Update the documentation when the public API, the configuration or the behaviour
   changes: `README.md` for the overview, `docs/CONFIGURATION.md` for keys,
   `docs/API.md` for endpoints, `docs/ARCHITECTURE.md` for structure,
   `docs/DEVELOPMENT.md` for tooling.
7. Never commit while `just gates` is red; run it locally first.
8. Open a pull request against `development`.

Releases are cut by merging `development` into `main` and tagging `vX.Y.Z`. The release
workflow builds the assets and publishes the release and its notes.

## Code style

`gofmt` and `go vet` run through `just fmt` and `just vet`, with zero diff and zero
warnings tolerated. `just vet` also runs `go fix -diff`, so modernisations are part of
the gate and not a follow-up. `just gates` is the definition of done in one command,
and the recipe file names what it contains. Errors are checked explicitly, wrapped as
`fmt.Errorf("context: %w", err)`, and nothing panics outside `main`. Error messages
are English, lowercase, with no trailing full stop, and SMTP credentials or full
request bodies never appear in a log line.

New source files open with the project's two-line licence header, whose SPDX
identifier matches `LICENSE`. Configuration files, workflows and dotfiles do not carry
it.

## AI contribution policy

AI tools are welcome as productivity aids and are a normal part of modern software
development. What matters is that the contribution stays understandable, reviewable and
genuinely useful.

- **Disclose the assistance.** If AI helped draft any part of a commit, issue, pull
  request or review, say so.
- **Commit messages carry exactly one trailer**, on the line after the subject:

  ```
  Assisted-by: MODEL
  ```

  Name the model that did the work, spelled the way its maker spells it, for example
  `GLM 5.3`, `DeepSeek V4.1 Flash` or `Qwen 3.8 Flash`. No `Co-Authored-By`, no `Signed-off-by`,
  no other trailers, and no prose: the trailer is the disclosure.
- **Issues and pull requests** attribute the assistance in a comment, for example
  `_Assisted-by: GLM 5.3 Flash_`. It does not belong in the pull request description.
- **Take responsibility.** You are accountable for the accuracy, completeness and
  intent of everything you submit, whether or not AI produced it.
- **Review before marking ready.** Read the diff carefully, run it locally, and add the
  tests it needs. Do not mark a pull request ready until you can defend every change in
  it.
- **Quality over quantity.** Contributions that look like un-reviewed output, or whose
  author cannot engage substantively during review, may be closed.
- **Preferred models.** Prefer open-weight models with transparent training data and
  minimal output filtering.

AI assists. It does not replace judgement.

## Continuous integration

Workflows live in `.gitea/workflows/` and run on the project's own runners:

| Workflow | Trigger | What it does |
|---|---|---|
| Test | push or pull request to `development` | build, format check, vet, modernisation, the test suite with the coverage floor |
| Race | dispatched by hand | the suite under the race detector, as a second opinion after the local gate |
| Release | a `v*` tag | the same gates as Test, then the matrix build, the proven version and the release itself; the race detector runs locally in `just gates` before the tag is cut |

The local equivalent is `just gates`, which is the same set plus the race detector.

## Reporting bugs

Open an issue at <https://sourcedock.dev/petrbalvin/nuntius/issues> with the
version (`bin/nuntius --version`), the operating system and architecture, the
exact command or request, the full output, and the expected against the
actual behaviour.

**Security issues do not go in the issue tracker.** Report them as
[SECURITY.md](SECURITY.md) describes.