Okay, I figured it out: ``` fun <R> callBase...

# gradle

[jlleitschuh]

Okay, I figured it out:

fun <R> callBasedOnContext(
    ifBuildScript: KotlinBuildScript.() -> R,
    ifSettingsScript: KotlinSettingsScript.() -> R
): R {
    val kotlinProjectClass: KClass<*> = KotlinBuildScript::class
    val kotlinSettingsClass: KClass<*> = KotlinSettingsScript::class

    return when {
        kotlinProjectClass.isInstance(this) -> (this as KotlinBuildScript).ifBuildScript()
        kotlinSettingsClass.isInstance(this) -> (this as KotlinSettingsScript).ifSettingsScript()
        else -> throw AssertionError("$this is not being applied to a supported type.")
    }
}

val extra: ExtraPropertiesExtension by lazy {
    callBasedOnContext(
        ifBuildScript = { (this as ExtensionAware).extra },
        ifSettingsScript = { (settings as ExtensionAware).extra }
    )
}

fun hasPropertyHelper(propertyName: String): Boolean {
    return callBasedOnContext(
        ifBuildScript = { hasProperty(propertyName) },
        ifSettingsScript = { (settings as ExtensionAware).extra.properties.containsKey(propertyName) }
    )
}

fun propertyHelper(propertyName: String): Any? {
    return callBasedOnContext(
        ifBuildScript = { property(propertyName) },
        ifSettingsScript = { (settings as ExtensionAware).extra.properties[propertyName] }
    )
}