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ammonite.interp.Watchable.scala Maven / Gradle / Ivy

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package ammonite.interp

trait Watchable {
  def poll(): Long
}
object Watchable {
  def mtimeIfExists(p: os.Path) = if (os.exists(p)) os.mtime(p) else 0L

  /**
   * Recursively mtimes things, with the sole purpose of providing a number
   * that will change if that file changes or that folder's contents changes
   *
   * Ensure we include the file paths within a folder as part of the folder
   * signature, as file moves often do not update the mtime but we want to
   * trigger a "something changed" event anyway
   */
  def pathSignature(p: os.Path) =
    if (!os.exists(p)) 0L
    else
      try {
        if (os.isDir(p)) os.walk(p).map(x => x.hashCode + mtimeIfExists(x)).sum
        else os.mtime(p)
      } catch {
        case e: java.nio.file.NoSuchFileException =>
          0L
      }
  case class Path(p: os.Path) extends Watchable {
    def poll() = pathSignature(p)
  }
  case class Value(f: () => Long) extends Watchable {
    def poll() = f()
  }
}




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