statistics from session build output;

--- a/src/Pure/General/time.scala	Sat Aug 13 12:05:53 2016 +0200
+++ b/src/Pure/General/time.scala	Sat Aug 13 12:06:11 2016 +0200
@@ -15,6 +15,8 @@
 {
   def seconds(s: Double): Time = new Time((s * 1000.0).round)
   def ms(m: Long): Time = new Time(m)
+  def hours_minutes_seconds(h: Int, m: Int, s: Double): Time = seconds(s + 60 * m + 3600 * h)
+
   def now(): Time = ms(System.currentTimeMillis())
 
   val zero: Time = ms(0)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/Tools/build_stats.scala	Sat Aug 13 12:06:11 2016 +0200
@@ -0,0 +1,78 @@
+/*  Title:      Pure/Tools/build_stats.scala
+    Author:     Makarius
+
+Statistics from session build output.
+*/
+
+package isabelle
+
+
+import scala.collection.mutable
+import scala.util.matching.Regex
+
+
+object Build_Stats
+{
+  private val Session_Finished =
+    new Regex("""^Finished (\S+) \((\d+):(\d+):(\d+) elapsed time, (\d+):(\d+):(\d+) cpu time.*$""")
+  private val Session_Timing =
+    new Regex("""^Timing (\S+) \((\d) threads, (\d+\.\d+)s elapsed time, (\d+\.\d+)s cpu time, (\d+\.\d+)s GC time.*$""")
+
+  private object ML_Option
+  {
+    def unapply(s: String): Option[(String, String)] =
+      s.indexOf('=') match {
+        case -1 => None
+        case i =>
+          val a = s.substring(0, i)
+          Library.try_unquote(s.substring(i + 1)) match {
+            case Some(b) if Build.ml_options.contains(a) => Some((a, b))
+            case _ => None
+          }
+      }
+  }
+
+  def parse(text: String): Build_Stats =
+  {
+    import Properties.Value
+
+    val ml_options = new mutable.ListBuffer[(String, String)]
+    var finished = Map.empty[String, Timing]
+    var timing = Map.empty[String, Timing]
+    var threads = Map.empty[String, Int]
+
+    for (line <- split_lines(text)) {
+      line match {
+        case Session_Finished(name,
+            Value.Int(e1), Value.Int(e2), Value.Int(e3),
+            Value.Int(c1), Value.Int(c2), Value.Int(c3)) =>
+          val elapsed = Time.hours_minutes_seconds(e1, e2, e3)
+          val cpu = Time.hours_minutes_seconds(c1, c2, c3)
+          finished += (name -> Timing(elapsed, cpu, Time.zero))
+        case Session_Timing(name,
+            Value.Int(t), Value.Double(e), Value.Double(c), Value.Double(g)) =>
+          val elapsed = Time.seconds(e)
+          val cpu = Time.seconds(c)
+          val gc = Time.seconds(g)
+          timing += (name -> Timing(elapsed, cpu, gc))
+          threads += (name -> t)
+        case ML_Option(option) => ml_options += option
+        case _ =>
+      }
+    }
+
+    Build_Stats(ml_options.toList, finished, timing, threads)
+  }
+}
+
+sealed case class Build_Stats(
+  ml_options: List[(String, String)],
+  finished: Map[String, Timing],
+  timing: Map[String, Timing],
+  threads: Map[String, Int])
+{
+  val sessions: Set[String] = finished.keySet ++ timing.keySet
+
+  override def toString: String =
+    sessions.toList.sorted.mkString("Build_Stats(", ", ", ")")
+}

--- a/src/Pure/build-jars	Sat Aug 13 12:05:53 2016 +0200
+++ b/src/Pure/build-jars	Sat Aug 13 12:06:11 2016 +0200
@@ -102,6 +102,7 @@
   Tools/bibtex.scala
   Tools/build.scala
   Tools/build_doc.scala
+  Tools/build_stats.scala
   Tools/check_keywords.scala
   Tools/check_sources.scala
   Tools/ci_api.scala