ZIO learning - playing with nio - read lines from file / published by https://github.com/dacr/code-examples-manager #e3a01f63-d280-4093-9514-f70e034a092e/7629ea5cfea25bbed50eeefcb6abd59a4c5ee260

zio-learning-nio-2-file-read-1-lines.sc

// summary : ZIO learning - playing with nio - read lines from file
// keywords : scala, zio, learning, nio, file, charset, permissions, write, read, pure-functional, @testable
// publish : gist
// authors : David Crosson
// license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt)
// id : e3a01f63-d280-4093-9514-f70e034a092e
// created-on : 2021-06-05T19:53:50Z
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala "3.4.2"
//> using dep "dev.zio::zio-nio:2.0.1"
// ---------------------
import zio.*
import zio.nio.file.*
import zio.nio.charset.Charset

import java.nio.file.attribute.{PosixFileAttributes, PosixFilePermission, PosixFilePermissions}

object App extends ZIOAppDefault {
  val hello   = "Hello world !\nYes it works"
  val charset = Charset.Standard.utf16

  val logic = for {
    encoded   <- charset.encodeString(hello)
    perms      = PosixFilePermissions.fromString("rw-r--r--")
    attrs      = PosixFilePermissions.asFileAttribute(perms)
    dest      <- Files.createTempFile(prefix = Some("truc"), fileAttributes = attrs :: Nil)
    _         <- Files.deleteIfExists(dest)
    _         <- Files.writeBytes(dest, encoded)
    linesRead <- Files.readAllLines(dest, charset)
    -         <- Console.printLine(s"read from $dest")
    -         <- Console.printLine(linesRead.mkString("\n"))
  } yield ()

  override def run = logic
}

// -------------------------------------------------------------

App.main(Array.empty)