Using scala default API for operations with files. / published by https://github.com/dacr/code-examples-manager #193b27c7-caf5-4938-b2c9-a853c68aacd0/57a4163af7050bf9310ae2980764b61bf673a8af

filesio-default-basics.sc

// summary : Using scala default API for operations with files.
// keywords : scala, file, io
// 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 : 193b27c7-caf5-4938-b2c9-a853c68aacd0
// created-on : 2020-05-31T19:54:52Z
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala "3.4.2"
// ---------------------

import scala.io.Source
import java.io.{File, FileOutputStream, PrintStream}

def fileContent(file: File): String = Source.fromFile(file).getLines().mkString("\n")
def cwd1:String = System.getProperty("user.dir")
def cwd2:String = new File(".").getCanonicalPath

println("------------- list files -----------------")
new File(s"$cwd1/example/").list().filter(_.endsWith(".md")).foreach(println)


println("------------- read file -----------------")

val content = fileContent(new File(s"$cwd1/example/index.md"))
println(content)


println("------------- write file -----------------")
val newContent =
  """# Some new title
    |with some content
    |""".stripMargin

val tmpFile = File.createTempFile("tmpfile", ".tmp")
val output = new PrintStream(new FileOutputStream(tmpFile))
output.print(newContent)
output.flush()
output.close()

val checkContent = fileContent(tmpFile)
assert( checkContent.trim == newContent.trim)