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Programmatically drive your real Compose UI on the desktop.

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<h1 align="center">
  <img src="docs/assets/spectre-logo.png" alt="Spectre" width="200" />
  <br />
  Spectre
</h1>

A Kotlin library for driving Compose Desktop UIs from automated tests. Reads the semantics
tree, drives mouse and keyboard input — either real OS-level events via `java.awt.Robot` or
synthetic AWT events dispatched straight into the window hierarchy (`RobotDriver.synthetic(...)`,
useful when tests run in parallel and can't fight over OS focus) — and records the screen,
against IDE-hosted Compose surfaces (IntelliJ, Jewel) and standalone desktop apps alike.

> [!IMPORTANT]
> Spectre is pre-1.0. Stable APIs are covered by the compatibility policy in
> [`docs/STABILITY.md`](docs/STABILITY.md); experimental APIs, especially the HTTP transport,
> may change between releases. Read [`docs/SECURITY.md`](docs/SECURITY.md) before enabling
> cross-JVM control or recording in environments that handle untrusted input.

macOS, Windows, Linux Xorg, and Linux Wayland. The Wayland path goes through a small
out-of-process Rust helper (`recording/native/linux/`) that owns the xdg-desktop-portal
handshake, the PipeWire FD lifetime, and the `gst-launch-1.0` subprocess; the JVM-side
recorder talks to it over stdin/stdout via a tiny JSON protocol. Same out-of-process
architecture as the macOS Swift helper.

> [!NOTE]
> **Linux support is best-effort.** Routine validation runs on one machine: Ubuntu 22.04,
> exercising the Xorg session (input + popup + HiDPI + `x11grab`) and the GNOME / mutter
> Wayland session (the portal-based recording path). Other distros, compositors (KDE /
> Plasma, sway, wlroots), window managers, and Ubuntu versions aren't covered. Reports
> and PRs widening the coverage are very welcome — open an issue with your distro /
> compositor / session combo and we'll work through it.

## Documentation

User guide and API documentation: **<https://spectre.sebastiano.dev>**.

Install released versions from Maven Central, or consume the current checkout as a
Gradle composite build while working ahead of a release:
[Installation](https://spectre.sebastiano.dev/guide/installation/).

Start at [Getting started](https://spectre.sebastiano.dev/guide/getting-started/) for the
shape of a Spectre test, or [The automator](https://spectre.sebastiano.dev/guide/automator/)
for the mental model.

Agent skill:

```shell
npx skills add rock3r/spectre --skill spectre
```

## Modules

- `core` — semantics tree, selectors, coordinate mapping, Robot-backed input.
- `server` — embedded HTTP transport (Ktor) for cross-JVM access. **Experimental**; see
  [`docs/SECURITY.md`](docs/SECURITY.md) for the trust model.
- `recording` — region capture, window-targeted video capture, and native still
  window screenshots where available (ScreenCaptureKit on macOS, Windows Graphics Capture
  on Windows, X11 region fallback on Linux). `AutoRecorder` / `AutoScreenshotter` pick per call. See
  [`docs/RECORDING-LIMITATIONS.md`](docs/RECORDING-LIMITATIONS.md).
- `recording-macos` — runtime-only macOS ScreenCaptureKit helper resources for native
  window/region recording and still screenshots.
- `recording-linux` — runtime-only Linux helper resources for native Xorg and Wayland capture.
- `recording-windows` — runtime-only Windows Graphics Capture helper resources for native
  window/region recording and still screenshots. Runtime machines need Windows 10 version
  1903+, .NET 8 Desktop Runtime, and Windows App Runtime 1.8; contributors building the
  helper need the .NET 8 SDK.
- `agent` — experimental local attach transport for driving a Spectre-instrumented JVM from a
  separate process.
- `agent-runtime` — loadable Java-agent runtime jar used by `agent` when attaching to a target JVM.
- `testing` — JUnit 5 extension and JUnit 4 rule.
- `sample-desktop` — Compose Desktop app for manual smokes.
- `sample-intellij-plugin` — in-tree IntelliJ plugin hosting a Jewel tool window. Unpublished;
  serves as the IDE-hosted test bed.

## Run the samples

Standalone Compose Desktop app:

```shell
./gradlew :sample-desktop:run
```

IntelliJ plugin — then `Tools → Run Spectre Against the Sample Tool Window`, or pass
`-PspectreAutorun=true` to fire the action on project open:

```shell
./gradlew :sample-intellij-plugin:runIde
```

## Quality checks

```shell
./gradlew check        # tests + Detekt + Compose Rules + ktfmt
./gradlew ktfmtFormat  # rewrite Kotlin / .gradle.kts in place
```

Two heavier checks live outside `:check`:

- `:sample-intellij-plugin:uiTest` — boots IntelliJ via `intellij-ide-starter`, installs the
  plugin, fires `RunSpectreAction`, and asserts every tagged Compose node shows up in
  `idea.log`.
- `:recording:check` on macOS — covers the Swift ScreenCaptureKit helper contract.

## Supported JVMs

JBR 21 (dev-loop default), JBR 25, and Temurin LTS (toolchain major) are the codified
supported set — see [docs/STABILITY.md](docs/STABILITY.md#jvm-runtime-support-tiers).
They are exercised by the scheduled [runtime matrix](.github/workflows/runtime-matrix.yml)
and re-run as a **release gate**. Per-PR CI stays on Temurin 21 for speed. Pins and the
bump procedure live in [`.github/jbr-pins.env`](.github/jbr-pins.env).

## CI

- [`ci.yml`](.github/workflows/ci.yml) — `:check` on Linux, every PR.
- [`macos-check.yml`](.github/workflows/macos-check.yml) — `:check` on macOS, broad path filter.
- [`windows.yml`](.github/workflows/windows.yml) — `:check` on Windows, broad path filter.
- [`macos.yml`](.github/workflows/macos.yml) — Swift helper build + `:recording:check`, gated
  on `recording/**` and `recording-macos/**`.
- [`ide-uitest.yml`](.github/workflows/ide-uitest.yml) — IDE-hosted UI test on macOS + Windows,
  gated on plugin / core / recording changes. `out/ide-tests/{installers,cache}` is cached
  between runs.
- [`validation-windows.yml`](.github/workflows/validation-windows.yml) —
  `:sample-desktop:validationTest*` on Windows, gated on `sample-desktop/**`. JUnit-XML-driven
  verifier so a Gradle/Compose protocol flake on shutdown can't hide a real failure.
- [`validation-linux.yml`](.github/workflows/validation-linux.yml) — same validation matrix
  on Linux under `xvfb-run` (real Xorg, no compositor in the loop), gated on the same
  `sample-desktop/**` filter shape.
- [`runtime-matrix.yml`](.github/workflows/runtime-matrix.yml) — weekly + release-gated
  `{JBR 21, JBR 25, Temurin LTS} × {macOS, Linux, Windows}` with contract corpus, agent
  attach (incl. mixed vanilla↔JBR on Linux), and Linux recording smoke under xvfb.

For consumer projects, see [Running on CI](docs/guide/ci.md) for the required test-JVM flags:
`java.awt.headless=false` for AWT, `skiko.renderApi=SOFTWARE_COMPAT` on GPU-less Linux runners,
and the macOS `apple.awt.UIElement=true` trade-offs for synthetic typing vs. clipboard paste.

## Reference docs

The user guide and these reference pages are also published as a single browseable site
at <https://spectre.sebastiano.dev>.

- [Architecture](docs/ARCHITECTURE.md)
- [Testing](docs/TESTING.md)
- [Conventions](docs/CONVENTIONS.md)
- [Static analysis](docs/STATIC-ANALYSIS.md)
- [Recording limitations](docs/RECORDING-LIMITATIONS.md)
- [Spike gist](https://gist.github.com/rock3r/8e520bb3fe8fe5886367d5e22cefbab8) — original
  design notes.

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