Finding values of file properties for kotlin compile tasks

build.gradle

subprojects {
    tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompileWithWorkers).configureEach { task ->
        doFirst {
            task.inputs.visitRegisteredProperties(new PropertyVisitor(task)) 
        }
    }
}

import org.gradle.api.internal.tasks.properties.*
class PropertyVisitor extends PropertyVisitor.Adapter {
    def task
    def buildScan

    PropertyVisitor(task) {
        this.task = task
        this.buildScan = task.project.rootProject.buildScan
    }

    void visitInputFileProperty(
        String propertyName, 
        boolean optional, 
        boolean skipWhenEmpty, 
        org.gradle.internal.fingerprint.DirectorySensitivity directorySensitivity,
        org.gradle.internal.fingerprint.LineEndingSensitivity lineEndingSensitivity,
        boolean incremental, 
        Class<? extends org.gradle.api.tasks.FileNormalizer> fileNormalizer, 
        PropertyValue value, 
        InputFilePropertyType filePropertyType
    ) {
        def v = value.call()
        if (v instanceof FileCollection) {
            v = v.files.join("\n")
        } else if (v instanceof List) {
            v = v.join("\n")
        }

        buildScan.value "${task.path}.${propertyName}", v.toString()
    }
}