Sublitles

ContinuousSubtitles.scala

import scala.io.Source
import java.nio.file.{Files, Paths}

/**
  * Fixes file where only end of subtitles are set.
  * Set start of next line to the end of previous
  */
object ContinuousSubtitles extends scala.App {
  val path = "/home/fokot/Downloads"
  val filename = "ss.srt"
  val lines = Source.fromFile(s"$path/$filename").getLines().toList
  val result = new StringBuilder(lines.size)
  var lastEnd = "00:0:00,000"
  lines.foreach { l =>
    if(l.contains("-->")) {
      val Array(_, end) = l.split("-->")
      result.appendAll(s"\n$lastEnd --> ${end.trim()}")
      lastEnd = end.trim()
    } else {
      result.appendAll(s"\n$l")
    }
  }

  Files.write(Paths.get(s"$path/ss.srt"), result.result().getBytes)
}

Subtitles.scala

import scala.io.Source
import java.nio.file.{Files, Paths}

/**
  * Converts text file to subtitle file
  */
object Subtitles extends scala.App {
  val path = "/home/fokot/Downloads"
  val filename = "s.srt"
  val source = Source.fromFile(s"$path/$filename")
  val subtitles = source.getLines().zipWithIndex.map(x => s"${x._2 + 1}\n00:10:00,000 --> 00:10:00,000\n${x._1}").mkString("\n\n")
  Files.write(Paths.get(s"$path/ss.srt"), subtitles.getBytes)
}