ZIO learning - application configuration revisited / published by https://github.com/dacr/code-examples-manager #bfdc2ecc-d046-48fd-9686-8dbe40ee02cc/72ebe9d0498fa117b8487613bf69b0f27ae2bc4f

zio-learning-config-2.sc

// summary : ZIO learning - application configuration revisited
// keywords : scala, zio, learning, pure-functional, kebacase, typesafeconfig, config, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : bfdc2ecc-d046-48fd-9686-8dbe40ee02cc
// created-on : 2021-03-29T19:16:09Z
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala  "3.2.2"
//> using dep "dev.zio::zio:2.0.13"
//> using dep "dev.zio::zio-config:4.0.0-RC14"
//> using dep "dev.zio::zio-config-typesafe:4.0.0-RC14"
//> using dep "dev.zio::zio-config-magnolia:4.0.0-RC14"
// ---------------------

import zio.*

import zio.config.*
import zio.config.typesafe.*
import zio.config.magnolia.*

case class Truc(
  name: String,
  myParam: Int,
  bidule: Option[Double]
)
case class MyConfig(
  truc: Truc
)

object Encapsulated extends ZIOAppDefault {
  // -------------------------------------------------------------
  val hoconConfigSource =
    ConfigProvider.fromHoconString(
      input = s"""truc {
                 |  name = blah
                 |  my-param = 42
                 |//  bidule = 42.0
                 |}
                 |""".stripMargin
    )

  // -------------------------------------------------------------
  val config = for {
    config <- hoconConfigSource.load(deriveConfig[MyConfig].mapKey(toKebabCase)) // read(descriptor[MyConfig].mapKey(toKebabCase) from hoconConfigSource)
  } yield config

  // -------------------------------------------------------------
  val logic = for {
    config <- ZIO.service[MyConfig]
    _      <- Console.printLine(config.truc.name + " " + config.truc.myParam + " " + config.truc.bidule)
  } yield ()

  // -------------------------------------------------------------
  val configLayer  = ZLayer.fromZIO(config)
  // -------------------------------------------------------------
  override def run = {
    logic.provideLayer(configLayer)
  }
}

Encapsulated.main(args)