wrapper for "isabelle update_imports" with selection options like "isabelle build";

--- a/src/Pure/System/isabelle_tool.scala	Wed Apr 19 20:10:34 2017 +0200
+++ b/src/Pure/System/isabelle_tool.scala	Wed Apr 19 21:32:46 2017 +0200
@@ -115,6 +115,7 @@
       Remote_DMG.isabelle_tool,
       Update_Cartouches.isabelle_tool,
       Update_Header.isabelle_tool,
+      Update_Imports.isabelle_tool,
       Update_Then.isabelle_tool,
       Update_Theorems.isabelle_tool,
       isabelle.vscode.Build_VSCode.isabelle_tool,

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/Tools/update_imports.scala	Wed Apr 19 21:32:46 2017 +0200
@@ -0,0 +1,88 @@
+/*  Title:      Pure/Tools/update_imports.scala
+    Author:     Makarius
+
+Update theory imports to use session qualifiers.
+*/
+
+package isabelle
+
+
+object Update_Imports
+{
+  /* update imports */
+
+  def update_imports(
+    options: Options,
+    progress: Progress = No_Progress,
+    selection: Sessions.Selection = Sessions.Selection.empty,
+    dirs: List[Path] = Nil,
+    select_dirs: List[Path] = Nil,
+    verbose: Boolean = false)
+  {
+    val full_sessions = Sessions.load(options, dirs, select_dirs)
+    val (selected, selected_sessions) = full_sessions.selection(selection)
+    val deps =
+      Sessions.deps(selected_sessions, progress = progress, verbose = verbose,
+        global_theories = full_sessions.global_theories)
+
+    // FIXME
+    selected.foreach(progress.echo(_))
+  }
+
+
+  /* Isabelle tool wrapper */
+
+  val isabelle_tool =
+    Isabelle_Tool("update_imports", "update theory imports to use session qualifiers", args =>
+    {
+      var select_dirs: List[Path] = Nil
+      var requirements = false
+      var exclude_session_groups: List[String] = Nil
+      var all_sessions = false
+      var dirs: List[Path] = Nil
+      var session_groups: List[String] = Nil
+      var options = Options.init()
+      var verbose = false
+      var exclude_sessions: List[String] = Nil
+
+      val getopts = Getopts("""
+Usage: isabelle update_imports [OPTIONS] [SESSIONS ...]
+
+  Options are:
+    -D DIR       include session directory and select its sessions
+    -R           operate on requirements of selected sessions
+    -X NAME      exclude sessions from group NAME and all descendants
+    -a           select all sessions
+    -d DIR       include session directory
+    -g NAME      select session group NAME
+    -o OPTION    override Isabelle system OPTION (via NAME=VAL or NAME)
+    -v           verbose
+    -x NAME      exclude session NAME and all descendants
+
+  Update theory imports to use session qualifiers.
+
+  Old versions of files are preserved by appending "~~".
+""",
+      "D:" -> (arg => select_dirs = select_dirs ::: List(Path.explode(arg))),
+      "R" -> (_ => requirements = true),
+      "X:" -> (arg => exclude_session_groups = exclude_session_groups ::: List(arg)),
+      "a" -> (_ => all_sessions = true),
+      "d:" -> (arg => dirs = dirs ::: List(Path.explode(arg))),
+      "g:" -> (arg => session_groups = session_groups ::: List(arg)),
+      "o:" -> (arg => options = options + arg),
+      "v" -> (_ => verbose = true),
+      "x:" -> (arg => exclude_sessions = exclude_sessions ::: List(arg)))
+
+      val sessions = getopts(args)
+      if (args.isEmpty) getopts.usage()
+
+      val selection =
+        Sessions.Selection(requirements, all_sessions, exclude_session_groups,
+          exclude_sessions, session_groups, sessions)
+
+      val progress = new Console_Progress(verbose = verbose)
+
+      update_imports(options, progress = progress, selection = selection,
+        dirs = dirs, select_dirs = select_dirs, verbose = verbose)
+    })
+}

--- a/src/Pure/build-jars	Wed Apr 19 20:10:34 2017 +0200
+++ b/src/Pure/build-jars	Wed Apr 19 21:32:46 2017 +0200
@@ -143,6 +143,7 @@
   Tools/task_statistics.scala
   Tools/update_cartouches.scala
   Tools/update_header.scala
+  Tools/update_imports.scala
   Tools/update_then.scala
   Tools/update_theorems.scala
   library.scala