Adding git version number to Kotlin source code

build.gradle.kts

import java.io.ByteArrayOutputStream

abstract class GitShaValueSource : ValueSource<String, ValueSourceParameters.None> {
    @get:Inject
    abstract val execOperations: ExecOperations

    override fun obtain(): String {
        return try {
            val output = ByteArrayOutputStream()
            execOperations.exec {
                commandLine = listOf("git", "rev-parse", "HEAD")
                standardOutput = output
            }
            output.toString().trim()
        } catch (ex: GradleException) {
            "unknown"
        }
    }
}
val gitVersionProvider: Provider<String> = providers.of(GitShaValueSource::class.java) {}

// Ресурсы
abstract class GenerateGitVersionResourceTask : DefaultTask() {
    @get:Input
    abstract val gitVersion: Property<String>

    @get:OutputDirectory
    abstract val outputDirectory: DirectoryProperty

    @TaskAction
    fun execute() {
        outputDirectory.file("project.version").get().asFile.writeText(gitVersion.get())
    }
}

val generatedResourcesDir = layout.buildDirectory.dir("generated-version-resources")
val generateGitVersionResourceTask = tasks.register<GenerateGitVersionResourceTask>("generateGitVersionResource") {
    gitVersion = gitVersionProvider
    outputDirectory = generatedResourcesDir
}

kotlin {
    sourceSets {
        // Или main
        commonMain {
            resources.srcDir(generateGitVersionResourceTask.flatMap(GenerateGitVersionResourceTask::outputDirectory))
        }
    }
}

// Kotlin файл
abstract class GenerateGitVersionKotlinSourceTask : DefaultTask() {
    @get:Input
    abstract val gitVersion: Property<String>

    @get:OutputDirectory
    abstract val outputDirectory: DirectoryProperty

    @TaskAction
    fun execute() {
        outputDirectory.file("ProjectVersion.kt").get().asFile.writeText("""
            |public const val PROJECT_VERSION: String = ""${'"'}${ gitVersion.get()}""${'"'}
        """.trimMargin())
    }
}

val generatedProjectVersionDir = layout.buildDirectory.dir("generated-version-kotlin")
val generateGitVersionKotlinTask = tasks.register<GenerateGitVersionKotlinSourceTask>("generateGitVersionKotlin") {
    gitVersion = gitVersionProvider
    outputDirectory = generatedProjectVersionDir
}

kotlin {
    sourceSets {
        // Или main
        commonMain {
            kotlin.srcDir(generateGitVersionKotlinTask.flatMap(GenerateGitVersionKotlinSourceTask::outputDirectory))
        }
    }
}