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package xyz.driver.core
package init
import scala.reflect.runtime
import scala.util.Try
import scala.util.control.NonFatal
/** Utility object to retrieve fields from static build configuration objects. */
private[init] object BuildInfoReflection {
final val BuildInfoName = "xyz.driver.BuildInfo"
lazy val name: String = get[String]("name")
lazy val version: Option[String] = find[String]("version")
/** Lookup a given field in the build configuration. This field is required to exist. */
private def get[A](fieldName: String): A =
try {
val mirror = runtime.currentMirror
val module = mirror.staticModule(BuildInfoName)
val instance = mirror.reflectModule(module).instance
val accessor = module.info.decl(mirror.universe.TermName(fieldName)).asMethod
mirror.reflect(instance).reflectMethod(accessor).apply().asInstanceOf[A]
} catch {
case NonFatal(err) =>
throw new RuntimeException(
s"Cannot find field name '$fieldName' in $BuildInfoName. Please define (or generate) a singleton " +
s"object with that field. Alternatively, in order to avoid runtime reflection, you may override the " +
s"caller with a static value.",
err
)
}
/** Try finding a given field in the build configuration. If the field does not exist, None is returned. */
private def find[A](fieldName: String): Option[A] = Try { get[A](fieldName) }.toOption
}
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