val project = ProjectManager.getInstance().openProjects.first()

val baseDir = VfsUtil.findFile(Paths.get(project.basePath), true)!!  
val psiManager = PsiManager.getInstance(project)  
val xmlFiles =  
    VfsUtil  
        .collectChildrenRecursively(baseDir)  
        .asSequence()  
        .filter { it.extension == "xml" }  
        .filterNot { it.path.contains("build") }  
        .mapNotNull { psiManager.findFile(it) as? XmlFile }

xmlFiles  
    .filter { it.virtualFile.path.contains("/res/values/") }  
    .mapNotNull { xmlFile -> xmlFile.rootTag?.findSubTags("string")?.asSequence() }  
    .flatten()  
    .mapNotNull { stringTag -> stringTag.getAttribute("name") }  
    .filter { nameAttribute -> nameAttribute.value?.contains('.') == true }  
    .forEach {  
        val oldName = it.value!!  
        val newName = oldName.replace('.', '_')  
        WriteCommandAction.runWriteCommandAction(project) {  
            it.setValue(newName)  
        }  
    }

fun XmlFile.getAllAttributesRecursively() =  
    generateSequence(  
        seed = listOf(element = rootTag!!),  
        nextFunction = {  
            val subTags = it.flatMap { it.subTags.toList() }  
            subTags.ifEmpty { null }  
        },  
    )  
        .flatMap { it.asSequence() }  
        .flatMap { it.attributes.asSequence() }  
  
  
val allXmlAttributes = xmlFiles.flatMap { xmlFile ->  
    xmlFile  
        .getAllAttributesRecursively()  
        .filter { it.value!!.startsWith("@string/") }  
        .filter { it.value!!.contains('.') }  
}

allXmlAttributes.forEach {  
    WriteCommandAction.runWriteCommandAction(project) {  
        it.setValue(  
            it.value!!.replace('.', '_')  
        )  
    }  
}

// Объявляем переменную
boolean enableInstabug = Boolean.valueOf(project.properties["enableInstabug"])

// В android блоке всё работает нормально
android {
    defaultConfig {
        manifestPlaceholders.readExtStoragePermMaxSdkVersion = enableInstabug ? "32" : "28"
    }
}

// А в методе - сюрприз! 🎉
def applyInstabugIfNeeded() {
    if (enableInstabug) { // Читает "false" как строку из gradle.properties
        apply plugin: 'instabug-apm'
        // ...
    }
}

def applyInstabugIfNeeded(boolean shouldEnableInstabug) { ... }

def applyInstabugIfNeeded = {
    if (enableInstabug) { ... }
}