package barstools.tapeout.transforms.utils

import firrtl.FileUtils
import net.jcazevedo.moultingyaml._

import java.io.File

class YamlFileReader(resource: String) {
  def parse[A](file: String = "")(implicit reader: YamlReader[A]): Seq[A] = {
    // If the user doesn't provide a Yaml file name, use defaults
    val yamlString = file match {
      case f if f.isEmpty =>
        // Use example config if no file is provided
        val stream = FileUtils.getTextResource(resource)
        stream
      case f if new File(f).exists =>
        FileUtils.getText(f)
      case _ =>
        throw new Exception("No valid Yaml file found!")
    }
    yamlString.parseYamls.map(x => reader.read(x))
  }
}