val generateClient = taskKey[Unit]("Generate Swagger client classes")
generateClient <<= (sourceManaged, fullClasspath in Compile, runner in Compile, streams) map { (src, cp, r, s) =>
  toError(r.run("io.swagger.codegen.SwaggerCodegen", cp.files,
    Array("generate", "-i", "http://petstore.swagger.io/v2/swagger.json", "-l", "java", "-o", "test_client"), s.log))
}

val generateClient2 = taskKey[Unit]("Generate Swagger client classes 2")
generateClient2 := {
  val options = ForkOptions()
  val arguments: Seq[String] = Array("generate", "-i", "http://petstore.swagger.io/v2/swagger.json", "-l", "java", "-o", "test_client")
  val mainClass: String = "io.swagger.codegen.SwaggerCodegen"
  Fork.java(options, mainClass +: arguments)
}