private
val slashOrDollar = Regex("[/$]")


// visible for testing
fun kotlinSourceNameOf(classFilePath: String): String =
    classFilePath
        .removeSuffix(CLASS_FILE_EXTENSION)
        .removeSuffix("Kt")
        .replace(slashOrDollar, ".")


// visible for testing
fun classFilePathCandidatesFor(sourceName: String): Sequence<String> =
    sourceName.replace(".", "/").let { path ->

        for ((targetType, extensionsSubset) in extensionsPerTarget) {
            writeExtensionsTo(
                sourceFile("${sourceFilesBaseName}_${hashTypeSourceName.apply(targetType.sourceName)}.kt"),
                packageName,
                targetType,
                extensionsSubset
            )
        }

        sourceFiles
    }


private

                // https://github.com/gradle/teamcity-jdk-provider-plugin/blob/main/teamcity-jdk-provider-plugin-agent/src/main/kotlin/org/gradle/teamcity_jdk_provider_plugin/JdkProviderAgentLifecycleListener.kt#L22
                param("JdkProviderEnabled", "false")
                // should be the same version we run TeamCity with
                param("env.JAVA_HOME", javaHome(DefaultJvm(JvmVersion.JAVA_21, JvmVendor.OPENJDK), Os.LINUX))

private
class KotlinVersionsToIncubatingCollector(val repositoryRoot: Path) : VersionsToIncubatingCollector {

    override fun collectFrom(sourceFile: File): VersionsToIncubating {

        if (!sourceFile.name.endsWith(".kt")) return emptyMap()

        val versionsToIncubating = mutableMapOf<Version, MutableSet<IncubatingDescription>>()
        KotlinSourceParser().mapParsedKotlinFiles(sourceFile) { ktFile ->

                    "kotlin/com/example/Source.kt",
                    """
                    package com.example

                    import org.gradle.api.Incubating

                    $v1
                    """
                )
            },
            v2 = {
                withKotlinFile(
                    "kotlin/com/example/Source.kt",
                    """

        // new file-facade class can be annotated with @Incubating, members must be annotated with @since
        checkBinaryCompatible(
            v2 = {
                withFile(
                    "kotlin/com/example/Source.kt",
                    """
                    @file:Incubating
                    package com.example

                    import org.gradle.api.Incubating

            compilerOptions {
                jvmTarget = targetJvmVersion.map {
                    JvmTarget.fromTarget(if (it < 9) "1.${it}" else it.toString())
                }

                // TODO KT-49746: Use the DSL to set the release version
                freeCompilerArgs.addAll(useRelease().zip(jvmTarget) { doUseRelease, targetVersion ->
                    if (doUseRelease) {

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