src/Pure/System/build.scala

cumulate semantic Session_Info, based on syntactic Session_Entry;
tuned errors;

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

Build and manage Isabelle sessions.
*/

package isabelle


import java.io.File

import scala.collection.mutable


object Build
{
  /* command line entry point */

  private object Bool
  {
    def unapply(s: String): Option[Boolean] =
      s match {
        case "true" => Some(true)
        case "false" => Some(false)
        case _ => None
      }
  }

  def main(args: Array[String])
  {
    def bad_args(): Nothing = error("Bad arguments: " + args.toString)

    val rc =
      try {
        args.toList match {
          case Bool(all_sessions) :: Bool(build_images) :: Bool(list_only) :: rest =>
            rest.indexWhere(_ == "\n") match {
              case -1 => bad_args()
              case i =>
                val (options, rest1) = rest.splitAt(i)
                val sessions = rest1.tail
                build(all_sessions, build_images, list_only, options, sessions)
            }
          case _ => bad_args()
        }
      }
      catch {
        case exn: Throwable => java.lang.System.err.println(Exn.message(exn)); 2
      }

    sys.exit(rc)
  }


  /* build */

  def build(all_sessions: Boolean, build_images: Boolean, list_only: Boolean,
    options: List[String], sessions: List[String]): Int =
  {
    println("options = " + options.toString)
    println("sessions = " + sessions.toString)

    find_sessions() foreach println

    0
  }


  /** session information **/

  type Options = List[(String, Option[String])]

  case class Session_Info(
    dir: Path,
    name: String,
    parent: String,
    description: String,
    options: Options,
    theories: List[(Options, String)],
    files: List[String])

  private val pure_info =
    Session_Info(Path.current, "Pure", "", "", Nil, List((Nil, "Pure")), Nil)


  /* parsing */

  val ROOT_NAME = "ROOT"

  private case class Session_Entry(
    name: String,
    reset: Boolean,
    path: Option[String],
    parent: String,
    description: String,
    options: Options,
    theories: List[(Options, List[String])],
    files: List[String])

  private object Parser extends Parse.Parser
  {
    val SESSION = "session"
    val IN = "in"
    val DESCRIPTION = "description"
    val OPTIONS = "options"
    val THEORIES = "theories"
    val FILES = "files"

    val syntax =
      Outer_Syntax.empty + "!" + "(" + ")" + "+" + "," + "=" + "[" + "]" +
        SESSION + IN + DESCRIPTION + OPTIONS + THEORIES + FILES

    val session_entry: Parser[Session_Entry] =
    {
      val session_name = atom("session name", _.is_name)
      val theory_name = atom("theory name", _.is_name)

      val option =
        name ~ opt(keyword("=") ~! name ^^ { case _ ~ x => x }) ^^ { case x ~ y => (x, y) }
      val options = keyword("[") ~> repsep(option, keyword(",")) <~ keyword("]")

      val theories =
        keyword(THEORIES) ~! ((options | success(Nil)) ~ rep1(theory_name)) ^^
          { case _ ~ (x ~ y) => (x, y) }

      ((keyword(SESSION) ~! session_name) ^^ { case _ ~ x => x }) ~
        (keyword("!") ^^^ true | success(false)) ~
        (opt(keyword(IN) ~! string ^^ { case _ ~ x => x })) ~
        (keyword("=") ~> session_name <~ keyword("+")) ~
        (keyword(DESCRIPTION) ~! text ^^ { case _ ~ x => x } | success("")) ~
        (keyword(OPTIONS) ~! options ^^ { case _ ~ x => x } | success(Nil)) ~
        rep1(theories) ~
        (keyword(FILES) ~! rep1(path) ^^ { case _ ~ x => x } | success(Nil)) ^^
          { case a ~ b ~ c ~ d ~ e ~ f ~ g ~ h => Session_Entry(a, b, c, d, e, f, g, h) }
    }

    def parse_entries(root: File): List[Session_Entry] =
    {
      val toks = syntax.scan(Standard_System.read_file(root))
      parse_all(rep(session_entry), Token.reader(toks, root.toString)) match {
        case Success(result, _) => result
        case bad => error(bad.toString)
      }
    }
  }


  /* find session */

  def find_sessions(more_dirs: List[Path] = Nil): List[Session_Info] =
  {
    val infos = new mutable.ListBuffer[Session_Info]
    infos += pure_info

    for {
      dir <- Isabelle_System.components() ++ more_dirs
      root = Isabelle_System.platform_file(dir + Path.basic(ROOT_NAME))
      if root.isFile
      entry <- Parser.parse_entries(root)
    }
    {
      try {
        val parent =
          infos.find(_.name == entry.parent) getOrElse
           error("Unknown parent session: " + quote(entry.parent))
        val full_name =
          if (entry.reset) entry.name
          else parent.name + "-" + entry.name
        val path =
          entry.path match {
            case Some(p) => Path.explode(p)
            case None => Path.basic(entry.name)
          }
        val thys = entry.theories.map({ case (x, ys) => ys.map(y => (x, y)) }).flatten
        val info =
          Session_Info(dir + path, full_name, entry.parent, entry.description,
            entry.options, thys, entry.files)
        infos += info
      }
      catch {
        case ERROR(msg) =>
          error(msg + "\nThe error(s) above occurred in session entry " +
            quote(entry.name) + " (file " + quote(root.toString) + ")")
      }
    }
    infos.toList
  }
}