[scripted] Session update without reload

sbt/src/sbt-test/project/session-update-from-cmd/build.check.1

@@ -0,0 +1,10 @@
+name := "projectName"
+
+k1 := {
+//
+//
+}
+
+k2 := {
+  println("This is k2")
+}

sbt/src/sbt-test/project/session-update-from-cmd/build.sbt

@@ -0,0 +1,7 @@
+name := "projectName"
+
+k1 := {}
+
+k2 := {
+  println("This is k2")
+}

sbt/src/sbt-test/project/session-update-from-cmd/project/build.scala

@@ -0,0 +1,25 @@
+import sbt._
+import Keys._
+
+object build extends Build {
+  lazy val k1 = taskKey[Unit]("")
+  lazy val k2 = taskKey[Unit]("")
+
+  val UpdateK1 = Command.command("UpdateK1") { st: State =>
+    val ex = Project extract st
+    import ex._
+    val session2 = BuiltinCommands.setThis(st, ex, Seq(k1 := {}), """k1 := {
+    |//
+    |//
+    |}""".stripMargin).session
+    val st1 = BuiltinCommands.reapply(session2, structure, st)
+    // SessionSettings.writeSettings(ex.currentRef, session2, ex.session.original, ex.structure)
+    SessionSettings.saveAllSettings(st1)
+  }
+
+	lazy val root = Project("root", file(".")) settings(
+    commands += UpdateK1
+  )
+}
+
+// vim: set ts=4 sw=4 et:

sbt/src/sbt-test/project/session-update-from-cmd/test

@@ -0,0 +1,4 @@
+> UpdateK1
+$ must-mirror build.sbt build.check.1
+> UpdateK1
+$ must-mirror build.sbt build.check.1