Changes

• Added GradleUtils.getComposePreviewVariant(), which returns a Variant when the build was invoked by Compose previews.
  • It returns Variant.Debug during IDE sync, which effectively prevents support for release mode Compose previews. An issue for this is opened at Release mode Compose previews are not supported #99.
  • It returns Variant.Release when invoked from release mode Compose previews, but since during IDE sync the JAR file for the debug build is used, the release preview tries to find the debug mode Rust dynamic library.
  • It returns null during normal builds.
• The Rust dynamic library JAR file and the desktop JNA are used inside runtimeOnly only if GradleUtils.getComposePreviewVariant() returns Variant.Debug. This makes them removed during normal builds.
• Made DependencyUtils.resolveUniFfiDependencies always register JNA as a dependency, as it is used inside Compose previews or unit tests so it is not included in the final app. This is to prevent resolving dependencies during configuration.

Testing

Tested with the Android tutorial added by #62. Compose test code is as follows.

Column(Modifier.safeContentPadding()) {
    val url = this::class.java.classLoader
        ?.getResource("darwin-aarch64/libapp.dylib")
        ?.toString()
    if (url == null) {
        Text("NOT FOUND")
    } else {
        Text(
            AnnotatedString.Builder().apply {
                append(url)
                val debugIdx = url.indexOf("debug.jar")
                if (debugIdx != -1) {
                    addStyle(SpanStyle(color = Color.Red), debugIdx, debugIdx + 5)
                }
            }.toAnnotatedString()
        )
    }
    Text("BuildConfig.DEBUG: ${BuildConfig.DEBUG}")
    Text("JNA Version: ${Native.VERSION}")
    Text("Addition using Rust: 2 + 3 = ${uniffi.app.add(2, 3)}")
    val greeting = remember { uniffi.app.Greeter("Hello") }
    Text(greeting.greet("Rust"))
    DisposableEffect(greeting) {
        onDispose {
            greeting.close()
        }
    }
}

Tested with a multi-module project as well.

Issues Fixed

Fixes: #92