src/Pure/System/setup_tool.scala

clarified signature;

/*  Title:      Pure/System/setup_tool.scala
    Author:     Makarius

Additional setup tools for other Isabelle distribution.
*/

package isabelle


object Setup_Tool {
  lazy val services: List[Setup_Tool] =
    Isabelle_System.make_services(classOf[Setup_Tool])

  def init(other_isabelle: Other_Isabelle, verbose: Boolean = false): Unit =
    services.foreach(_.init(other_isabelle, verbose = verbose))
}

abstract class Setup_Tool(tool: String, val variable: String)
extends Isabelle_System.Service {
  override def toString: String = tool

  val test_file: Path = Path.explode("lib/Tools") + Path.basic(tool)

  def test(other_isabelle: Other_Isabelle): Boolean =
    other_isabelle.getenv(variable) == "true" &&
    other_isabelle.ssh.is_file(other_isabelle.isabelle_home + test_file)

  def run(other_isabelle: Other_Isabelle, verbose: Boolean = false): Unit =
    other_isabelle.bash("bin/isabelle " + Bash.string(tool), echo = verbose)

  def init(other_isabelle: Other_Isabelle, verbose: Boolean = false): Unit =
    if (test(other_isabelle)) run(other_isabelle, verbose = verbose)
}

class GHC_Setup extends Setup_Tool("ghc_setup", "ISABELLE_GHC_SETUP")
class OCaml_Setup extends Setup_Tool("ocaml_setup", "ISABELLE_OCAML_SETUP")