diff --git a/src/Pure/PIDE/command.ML b/src/Pure/PIDE/command.ML
--- a/src/Pure/PIDE/command.ML
+++ b/src/Pure/PIDE/command.ML
@@ -1,509 +1,507 @@
 (*  Title:      Pure/PIDE/command.ML
     Author:     Makarius
 
 Prover command execution: read -- eval -- print.
 *)
 
 signature COMMAND =
 sig
   type blob = {file_node: string, src_path: Path.T, content: (SHA1.digest * string list) option}
   val read_file: Path.T -> Position.T -> bool -> Path.T -> Token.file
   val read_thy: Toplevel.state -> theory
   val read: Keyword.keywords -> theory -> Path.T-> (unit -> theory) ->
     blob Exn.result list * int -> Token.T list -> Toplevel.transition
   val read_span: Keyword.keywords -> Toplevel.state -> Path.T -> (unit -> theory) ->
     Command_Span.span -> Toplevel.transition
   type eval
   val eval_command_id: eval -> Document_ID.command
   val eval_exec_id: eval -> Document_ID.exec
   val eval_eq: eval * eval -> bool
   val eval_running: eval -> bool
   val eval_finished: eval -> bool
   val eval_result_command: eval -> Toplevel.transition
   val eval_result_state: eval -> Toplevel.state
   val eval: Keyword.keywords -> Path.T -> (unit -> theory) ->
     blob Exn.result list * int -> Document_ID.command -> Token.T list -> eval -> eval
   type print
   type print_fn = Toplevel.transition -> Toplevel.state -> unit
   val print0: {pri: int, print_fn: print_fn} -> eval -> print
   val print: bool -> (string * string list) list -> Keyword.keywords -> string ->
     eval -> print list -> print list option
   val parallel_print: print -> bool
   type print_function =
     {keywords: Keyword.keywords, command_name: string, args: string list, exec_id: Document_ID.exec} ->
       {delay: Time.time option, pri: int, persistent: bool, strict: bool, print_fn: print_fn} option
   val print_function: string -> print_function -> unit
   val no_print_function: string -> unit
   type exec = eval * print list
   val init_exec: theory option -> exec
   val no_exec: exec
   val exec_ids: exec option -> Document_ID.exec list
   val exec: Document_ID.execution -> exec -> unit
   val exec_parallel_prints: Document_ID.execution -> Future.task list -> exec -> exec option
 end;
 
 structure Command: COMMAND =
 struct
 
 (** main phases of execution **)
 
 fun task_context group f =
   f
   |> Future.interruptible_task
   |> Future.task_context "Command.run_process" group;
 
 
 (* read *)
 
 type blob = {file_node: string, src_path: Path.T, content: (SHA1.digest * string list) option};
 
 fun read_file_node file_node master_dir pos delimited src_path =
   let
     val _ =
       if Context_Position.pide_reports ()
       then Position.report pos (Markup.language_path delimited) else ();
 
     fun read_file () =
       let
         val path = File.check_file (File.full_path master_dir src_path);
         val text = File.read path;
         val file_pos = Path.position path;
       in (text, file_pos) end;
 
     fun read_url () =
       let
         val text = Isabelle_System.download file_node;
         val file_pos = Position.file file_node;
       in (text, file_pos) end;
 
     val (text, file_pos) =
       (case try Url.explode file_node of
         NONE => read_file ()
       | SOME (Url.File _) => read_file ()
       | _ => read_url ());
 
     val lines = split_lines text;
     val digest = SHA1.digest text;
   in {src_path = src_path, lines = lines, digest = digest, pos = Position.copy_id pos file_pos} end
   handle ERROR msg => error (msg ^ Position.here pos);
 
 val read_file = read_file_node "";
 
 local
 
 fun blob_file src_path lines digest file_node =
   let
     val file_pos =
       Position.file file_node |>
       (case Position.get_id (Position.thread_data ()) of
         NONE => I
       | SOME exec_id => Position.put_id exec_id);
   in {src_path = src_path, lines = lines, digest = digest, pos = file_pos} end
 
 fun resolve_files master_dir (blobs, blobs_index) toks =
   (case Outer_Syntax.parse_spans toks of
     [Command_Span.Span (Command_Span.Command_Span _, _)] =>
       (case try (nth toks) blobs_index of
         SOME tok =>
           let
             val source = Token.input_of tok;
             val pos = Input.pos_of source;
             val delimited = Input.is_delimited source;
 
             fun make_file (Exn.Res {file_node, src_path, content = NONE}) =
                   Exn.interruptible_capture (fn () =>
                     read_file_node file_node master_dir pos delimited src_path) ()
               | make_file (Exn.Res {file_node, src_path, content = SOME (digest, lines)}) =
                   (Position.report pos (Markup.language_path delimited);
                     Exn.Res (blob_file src_path lines digest file_node))
               | make_file (Exn.Exn e) = Exn.Exn e;
             val files = map make_file blobs;
           in
             toks |> map_index (fn (i, tok) =>
               if i = blobs_index then Token.put_files files tok else tok)
           end
       | NONE => toks)
   | _ => toks);
 
 fun reports_of_token keywords tok =
   let
     val malformed_symbols =
       Input.source_explode (Token.input_of tok)
       |> map_filter (fn (sym, pos) =>
           if Symbol.is_malformed sym
           then SOME ((pos, Markup.bad ()), "Malformed symbolic character") else NONE);
     val is_malformed = Token.is_error tok orelse not (null malformed_symbols);
     val reports = Token.reports keywords tok @ Token.completion_report tok @ malformed_symbols;
   in (is_malformed, reports) end;
 
 in
 
 fun read_thy st = Toplevel.theory_of st
   handle Toplevel.UNDEF => Pure_Syn.bootstrap_thy;
 
 fun read keywords thy master_dir init blobs_info span =
   let
     val command_reports = Outer_Syntax.command_reports thy;
     val token_reports = map (reports_of_token keywords) span;
     val _ = Position.reports_text (maps #2 token_reports @ maps command_reports span);
 
     val verbatim =
       span |> map_filter (fn tok =>
         if Token.kind_of tok = Token.Verbatim then SOME (Token.pos_of tok) else NONE);
     val _ =
       if null verbatim then ()
       else legacy_feature ("Old-style {* verbatim *} token -- use \<open>cartouche\<close> instead" ^
         Position.here_list verbatim);
   in
     if exists #1 token_reports
     then Toplevel.malformed (Token.core_range_of span) "Malformed command syntax"
     else Outer_Syntax.parse_span thy init (resolve_files master_dir blobs_info span)
   end;
 
 end;
 
 fun read_span keywords st master_dir init =
   Command_Span.content #> read keywords (read_thy st) master_dir init ([], ~1);
 
 
 (* eval *)
 
 type eval_state = {failed: bool, command: Toplevel.transition, state: Toplevel.state};
 
 fun init_eval_state opt_thy =
  {failed = false,
   command = Toplevel.empty,
   state =
     (case opt_thy of
       NONE => Toplevel.init_toplevel ()
     | SOME thy => Toplevel.theory_toplevel thy)};
 
 datatype eval =
   Eval of
     {command_id: Document_ID.command, exec_id: Document_ID.exec, eval_process: eval_state lazy};
 
 fun eval_command_id (Eval {command_id, ...}) = command_id;
 
 fun eval_exec_id (Eval {exec_id, ...}) = exec_id;
 val eval_eq = op = o apply2 eval_exec_id;
 
 val eval_running = Execution.is_running_exec o eval_exec_id;
 fun eval_finished (Eval {eval_process, ...}) = Lazy.is_finished eval_process;
 
 fun eval_result (Eval {eval_process, ...}) =
   Exn.release (Lazy.finished_result eval_process);
 
 val eval_result_command = #command o eval_result;
 val eval_result_state = #state o eval_result;
 
 local
 
 fun reset_state keywords tr st0 = Toplevel.setmp_thread_position tr (fn () =>
   let
     val name = Toplevel.name_of tr;
     val res =
       if Keyword.is_theory_body keywords name then Toplevel.reset_theory st0
       else if Keyword.is_proof keywords name then Toplevel.reset_proof st0
       else if Keyword.is_theory_end keywords name then
         (case Toplevel.reset_notepad st0 of
           NONE => Toplevel.reset_theory st0
         | some => some)
       else NONE;
   in
     (case res of
       NONE => st0
     | SOME st => (Output.error_message (Toplevel.type_error tr ^ " -- using reset state"); st))
   end) ();
 
 fun run keywords int tr st =
   if Future.proofs_enabled 1 andalso Keyword.is_diag keywords (Toplevel.name_of tr) then
     let
       val (tr1, tr2) = Toplevel.fork_presentation tr;
       val _ =
         Execution.fork {name = "Toplevel.diag", pos = Toplevel.pos_of tr, pri = ~1}
           (fn () => Toplevel.command_exception int tr1 st);
     in Toplevel.command_errors int tr2 st end
   else Toplevel.command_errors int tr st;
 
 fun check_token_comments ctxt tok =
   (Thy_Output.check_comments ctxt (Input.source_explode (Token.input_of tok)); [])
     handle exn =>
       if Exn.is_interrupt exn then Exn.reraise exn
       else Runtime.exn_messages exn;
 
 fun check_span_comments ctxt span tr =
   Toplevel.setmp_thread_position tr (fn () => maps (check_token_comments ctxt) span) ();
 
 fun report_indent tr st =
   (case try Toplevel.proof_of st of
     SOME prf =>
       let val keywords = Thy_Header.get_keywords (Proof.theory_of prf) in
         if Keyword.command_kind keywords (Toplevel.name_of tr) = SOME Keyword.prf_script then
           (case try (Thm.nprems_of o #goal o Proof.goal) prf of
             NONE => ()
           | SOME 0 => ()
           | SOME n =>
-              let
-                val pos = #1 (Toplevel.body_range_of tr);
-                val m = Markup.command_indent (n - 1);
-              in Toplevel.setmp_thread_position tr (fn () => Position.report pos m) () end)
+              let val report = Markup.markup_only (Markup.command_indent (n - 1));
+              in Toplevel.setmp_thread_position tr (fn () => Output.report [report]) () end)
         else ()
       end
   | NONE => ());
 
 fun status tr m =
   Toplevel.setmp_thread_position tr (fn () => Output.status [Markup.markup_only m]) ();
 
 fun eval_state keywords span tr ({state, ...}: eval_state) =
   let
     val _ = Thread_Attributes.expose_interrupt ();
 
     val st = reset_state keywords tr state;
 
     val _ = report_indent tr st;
     val _ = status tr Markup.running;
     val (errs1, result) = run keywords true tr st;
     val errs2 =
       (case result of
         NONE => []
       | SOME st' => check_span_comments (Toplevel.presentation_context st') span tr);
     val errs = errs1 @ errs2;
     val _ = List.app (Future.error_message (Toplevel.pos_of tr)) errs;
   in
     (case result of
       NONE =>
         let
           val _ = status tr Markup.failed;
           val _ = status tr Markup.finished;
           val _ = if null errs then (status tr Markup.canceled; Exn.interrupt ()) else ();
         in {failed = true, command = tr, state = st} end
     | SOME st' =>
         let
           val _ =
             if Keyword.is_theory_end keywords (Toplevel.name_of tr) andalso
               can (Toplevel.end_theory Position.none) st'
             then status tr Markup.finalized else ();
           val _ = status tr Markup.finished;
         in {failed = false, command = tr, state = st'} end)
   end;
 
 in
 
 fun eval keywords master_dir init blobs_info command_id span eval0 =
   let
     val exec_id = Document_ID.make ();
     fun process () =
       let
         val eval_state0 = eval_result eval0;
         val thy = read_thy (#state eval_state0);
         val tr =
           Position.setmp_thread_data (Position.id_only (Document_ID.print exec_id))
             (fn () =>
               read keywords thy master_dir init blobs_info span |> Toplevel.exec_id exec_id) ();
       in eval_state keywords span tr eval_state0 end;
   in
     Eval {command_id = command_id, exec_id = exec_id,
       eval_process = Lazy.lazy_name "Command.eval" process}
   end;
 
 end;
 
 
 (* print *)
 
 datatype print = Print of
  {name: string, args: string list, delay: Time.time option, pri: int, persistent: bool,
   exec_id: Document_ID.exec, print_process: unit lazy};
 
 fun print_exec_id (Print {exec_id, ...}) = exec_id;
 val print_eq = op = o apply2 print_exec_id;
 
 type print_fn = Toplevel.transition -> Toplevel.state -> unit;
 
 type print_function =
   {keywords: Keyword.keywords, command_name: string, args: string list, exec_id: Document_ID.exec} ->
     {delay: Time.time option, pri: int, persistent: bool, strict: bool, print_fn: print_fn} option;
 
 local
 
 val print_functions =
   Synchronized.var "Command.print_functions" ([]: (string * print_function) list);
 
 fun print_error tr opt_context e =
   (Toplevel.setmp_thread_position tr o Runtime.controlled_execution opt_context) e ()
     handle exn =>
       if Exn.is_interrupt exn then Exn.reraise exn
       else List.app (Future.error_message (Toplevel.pos_of tr)) (Runtime.exn_messages exn);
 
 fun print_finished (Print {print_process, ...}) = Lazy.is_finished print_process;
 
 fun print_persistent (Print {persistent, ...}) = persistent;
 
 val overlay_ord = prod_ord string_ord (list_ord string_ord);
 
 fun make_print (name, args) {delay, pri, persistent, strict, print_fn} eval =
   let
     val exec_id = Document_ID.make ();
     fun process () =
       let
         val {failed, command, state = st', ...} = eval_result eval;
         val tr = Toplevel.exec_id exec_id command;
         val opt_context = try Toplevel.generic_theory_of st';
       in
         if failed andalso strict then ()
         else print_error tr opt_context (fn () => print_fn tr st')
       end;
   in
     Print {
       name = name, args = args, delay = delay, pri = pri, persistent = persistent,
       exec_id = exec_id, print_process = Lazy.lazy_name "Command.print" process}
   end;
 
 fun bad_print name_args exn =
   make_print name_args {delay = NONE, pri = 0, persistent = false,
     strict = false, print_fn = fn _ => fn _ => Exn.reraise exn};
 
 in
 
 fun print0 {pri, print_fn} =
   make_print ("", [serial_string ()])
     {delay = NONE, pri = pri, persistent = true, strict = true, print_fn = print_fn};
 
 fun print command_visible command_overlays keywords command_name eval old_prints =
   let
     val print_functions = Synchronized.value print_functions;
 
     fun new_print (name, args) get_pr =
       let
         val params =
          {keywords = keywords,
           command_name = command_name,
           args = args,
           exec_id = eval_exec_id eval};
       in
         (case Exn.capture (Runtime.controlled_execution NONE get_pr) params of
           Exn.Res NONE => NONE
         | Exn.Res (SOME pr) => SOME (make_print (name, args) pr eval)
         | Exn.Exn exn => SOME (bad_print (name, args) exn eval))
       end;
 
     fun get_print (name, args) =
       (case find_first (fn Print print => (#name print, #args print) = (name, args)) old_prints of
         NONE =>
           (case AList.lookup (op =) print_functions name of
             NONE =>
               SOME (bad_print (name, args) (ERROR ("Missing print function " ^ quote name)) eval)
           | SOME get_pr => new_print (name, args) get_pr)
       | some => some);
 
     val retained_prints =
       filter (fn print => print_finished print andalso print_persistent print) old_prints;
     val visible_prints =
       if command_visible then
         fold (fn (name, _) => cons (name, [])) print_functions command_overlays
         |> sort_distinct overlay_ord
         |> map_filter get_print
       else [];
     val new_prints = visible_prints @ retained_prints;
   in
     if eq_list print_eq (old_prints, new_prints) then NONE else SOME new_prints
   end;
 
 fun parallel_print (Print {pri, ...}) =
   pri <= 0 orelse (Future.enabled () andalso Options.default_bool "parallel_print");
 
 fun print_function name f =
   Synchronized.change print_functions (fn funs =>
    (if name = "" then error "Unnamed print function" else ();
     if not (AList.defined (op =) funs name) then ()
     else warning ("Redefining command print function: " ^ quote name);
     AList.update (op =) (name, f) funs));
 
 fun no_print_function name =
   Synchronized.change print_functions (filter_out (equal name o #1));
 
 end;
 
 val _ =
   print_function "Execution.print"
     (fn {args, exec_id, ...} =>
       if null args then
         SOME {delay = NONE, pri = Task_Queue.urgent_pri + 2, persistent = false, strict = false,
           print_fn = fn _ => fn _ => Execution.fork_prints exec_id}
       else NONE);
 
 val _ =
   print_function "print_state"
     (fn {keywords, command_name, ...} =>
       if Options.default_bool "editor_output_state" andalso Keyword.is_printed keywords command_name
       then
         SOME {delay = NONE, pri = Task_Queue.urgent_pri + 1, persistent = false, strict = false,
           print_fn = fn _ => fn st =>
             if Toplevel.is_proof st then Output.state (Toplevel.string_of_state st)
             else ()}
       else NONE);
 
 
 (* combined execution *)
 
 type exec = eval * print list;
 
 fun init_exec opt_thy : exec =
   (Eval
     {command_id = Document_ID.none, exec_id = Document_ID.none,
       eval_process = Lazy.value (init_eval_state opt_thy)}, []);
 
 val no_exec = init_exec NONE;
 
 fun exec_ids NONE = []
   | exec_ids (SOME (eval, prints)) = eval_exec_id eval :: map print_exec_id prints;
 
 local
 
 fun run_process execution_id exec_id process =
   let val group = Future.worker_subgroup () in
     if Execution.running execution_id exec_id [group] then
       ignore (task_context group (fn () => Lazy.force_result {strict = true} process) ())
     else ()
   end;
 
 fun ignore_process process =
   Lazy.is_running process orelse Lazy.is_finished process;
 
 fun run_eval execution_id (Eval {exec_id, eval_process, ...}) =
   if Lazy.is_finished eval_process then ()
   else run_process execution_id exec_id eval_process;
 
 fun fork_print execution_id deps (Print {name, delay, pri, exec_id, print_process, ...}) =
   let
     val group = Future.worker_subgroup ();
     fun fork () =
       ignore ((singleton o Future.forks)
         {name = name, group = SOME group, deps = deps, pri = pri, interrupts = true}
         (fn () =>
           if ignore_process print_process then ()
           else run_process execution_id exec_id print_process));
   in
     (case delay of
       NONE => fork ()
     | SOME d => ignore (Event_Timer.request {physical = true} (Time.now () + d) fork))
   end;
 
 fun run_print execution_id (print as Print {exec_id, print_process, ...}) =
   if ignore_process print_process then ()
   else if parallel_print print then fork_print execution_id [] print
   else run_process execution_id exec_id print_process;
 
 in
 
 fun exec execution_id (eval, prints) =
   (run_eval execution_id eval; List.app (run_print execution_id) prints);
 
 fun exec_parallel_prints execution_id deps (exec as (Eval {eval_process, ...}, prints)) =
   if Lazy.is_finished eval_process
   then (List.app (fork_print execution_id deps) prints; NONE)
   else SOME exec;
 
 end;
 
 end;
diff --git a/src/Tools/jEdit/src/text_structure.scala b/src/Tools/jEdit/src/text_structure.scala
--- a/src/Tools/jEdit/src/text_structure.scala
+++ b/src/Tools/jEdit/src/text_structure.scala
@@ -1,353 +1,354 @@
 /*  Title:      Tools/jEdit/src/text_structure.scala
     Author:     Makarius
 
 Text structure based on Isabelle/Isar outer syntax.
 */
 
 package isabelle.jedit
 
 
 import isabelle._
 
 import org.gjt.sp.jedit.indent.{IndentRule, IndentAction}
 import org.gjt.sp.jedit.textarea.{TextArea, StructureMatcher, Selection}
 import org.gjt.sp.jedit.buffer.JEditBuffer
 import org.gjt.sp.jedit.Buffer
 
 
 object Text_Structure
 {
   /* token navigator */
 
   class Navigator(syntax: Outer_Syntax, buffer: JEditBuffer, comments: Boolean)
   {
     val limit: Int = PIDE.options.value.int("jedit_structure_limit") max 0
 
     def iterator(line: Int, lim: Int = limit): Iterator[Text.Info[Token]] =
     {
       val it = Token_Markup.line_token_iterator(syntax, buffer, line, line + lim)
       if (comments) it.filterNot(_.info.is_space) else it.filter(_.info.is_proper)
     }
 
     def reverse_iterator(line: Int, lim: Int = limit): Iterator[Text.Info[Token]] =
     {
       val it = Token_Markup.line_token_reverse_iterator(syntax, buffer, line, line - lim)
       if (comments) it.filterNot(_.info.is_space) else it.filter(_.info.is_proper)
     }
   }
 
 
   /* indentation */
 
   object Indent_Rule extends IndentRule
   {
     private val keyword_open = Keyword.theory_goal ++ Keyword.proof_open
     private val keyword_close = Keyword.proof_close
 
     def apply(buffer: JEditBuffer, current_line: Int, prev_line0: Int, prev_prev_line0: Int,
       actions: java.util.List[IndentAction])
     {
       Isabelle.buffer_syntax(buffer) match {
         case Some(syntax) =>
           val keywords = syntax.keywords
           val nav = new Navigator(syntax, buffer, true)
 
           val indent_size = buffer.getIndentSize
 
 
           def line_indent(line: Int): Int =
             if (line < 0 || line >= buffer.getLineCount) 0
             else buffer.getCurrentIndentForLine(line, null)
 
           def line_head(line: Int): Option[Text.Info[Token]] =
             nav.iterator(line, 1).toStream.headOption
 
           def head_is_quasi_command(line: Int): Boolean =
             line_head(line) match {
               case None => false
               case Some(Text.Info(_, tok)) => keywords.is_quasi_command(tok)
             }
 
           val prev_line: Int =
             Range.inclusive(current_line - 1, 0, -1).find(line =>
               Token_Markup.Line_Context.before(buffer, line).get_context == Scan.Finished &&
               (!Token_Markup.Line_Context.after(buffer, line).structure.improper ||
                 Token_Markup.Line_Context.after(buffer, line).structure.blank)) getOrElse -1
 
           def prev_line_command: Option[Token] =
             nav.reverse_iterator(prev_line, 1).
               collectFirst({ case Text.Info(_, tok) if tok.is_begin_or_command => tok })
 
           def prev_line_span: Iterator[Token] =
             nav.reverse_iterator(prev_line, 1).map(_.info).takeWhile(tok => !tok.is_begin_or_command)
 
           def prev_span: Iterator[Token] =
             nav.reverse_iterator(prev_line).map(_.info).takeWhile(tok => !tok.is_begin_or_command)
 
 
           val script_indent: Text.Info[Token] => Int =
           {
             val opt_rendering: Option[JEdit_Rendering] =
               if (PIDE.options.value.bool("jedit_indent_script"))
                 GUI_Thread.now {
                   (for {
                     text_area <- JEdit_Lib.jedit_text_areas(buffer)
                     doc_view <- Document_View.get(text_area)
                   } yield doc_view.get_rendering).toStream.headOption
                 }
               else None
             val limit = PIDE.options.value.int("jedit_indent_script_limit")
             (info: Text.Info[Token]) =>
               opt_rendering match {
                 case Some(rendering) if keywords.is_command(info.info, Keyword.prf_script) =>
                   (rendering.indentation(info.range) min limit) max 0
                 case _ => 0
               }
           }
 
           def indent_indent(tok: Token): Int =
             if (keywords.is_command(tok, keyword_open)) indent_size
             else if (keywords.is_command(tok, keyword_close)) - indent_size
             else 0
 
           def indent_offset(tok: Token): Int =
             if (keywords.is_command(tok, Keyword.proof_enclose)) indent_size
             else 0
 
           def indent_structure: Int =
             nav.reverse_iterator(current_line - 1).scanLeft((0, false))(
               { case ((ind, _), Text.Info(range, tok)) =>
                   val ind1 = ind + indent_indent(tok)
                   if (tok.is_begin_or_command && !keywords.is_command(tok, Keyword.prf_script)) {
                     val line = buffer.getLineOfOffset(range.start)
                     line_head(line) match {
                       case Some(info) if info.info == tok =>
                         (ind1 + indent_offset(tok) + line_indent(line), true)
                       case _ => (ind1, false)
                     }
                   }
                   else (ind1, false)
               }).collectFirst({ case (i, true) => i }).getOrElse(0)
 
           def indent_brackets: Int =
             (0 /: prev_line_span)(
               { case (i, tok) =>
                   if (tok.is_open_bracket) i + indent_size
                   else if (tok.is_close_bracket) i - indent_size
                   else i })
 
           def indent_extra: Int =
             if (prev_span.exists(keywords.is_quasi_command)) indent_size
             else 0
 
           val indent =
             if (Token_Markup.Line_Context.before(buffer, current_line).get_context != Scan.Finished)
               line_indent(current_line)
             else if (Token_Markup.Line_Context.after(buffer, current_line).structure.blank) 0
             else {
               line_head(current_line) match {
-                case Some(info @ Text.Info(range, tok)) =>
+                case Some(info) =>
+                  val tok = info.info
                   if (tok.is_begin ||
                       keywords.is_before_command(tok) ||
                       keywords.is_command(tok, Keyword.theory)) 0
                   else if (keywords.is_command(tok, Keyword.proof_enclose))
                     indent_structure + script_indent(info) - indent_offset(tok)
                   else if (keywords.is_command(tok, Keyword.proof))
                     (indent_structure + script_indent(info) - indent_offset(tok)) max indent_size
                   else if (tok.is_command) indent_structure - indent_offset(tok)
                   else {
                     prev_line_command match {
                       case None =>
                         val extra =
                           (keywords.is_quasi_command(tok), head_is_quasi_command(prev_line)) match {
                             case (true, true) | (false, false) => 0
                             case (true, false) => - indent_extra
                             case (false, true) => indent_extra
                           }
                         line_indent(prev_line) + indent_brackets + extra - indent_offset(tok)
                       case Some(prev_tok) =>
                         indent_structure + indent_brackets + indent_size - indent_offset(tok) -
                         indent_offset(prev_tok) - indent_indent(prev_tok)
                     }
                   }
                 case None =>
                   prev_line_command match {
                     case None =>
                       val extra = if (head_is_quasi_command(prev_line)) indent_extra else 0
                       line_indent(prev_line) + indent_brackets + extra
                     case Some(prev_tok) =>
                       indent_structure + indent_brackets + indent_size -
                       indent_offset(prev_tok) - indent_indent(prev_tok)
                   }
               }
             }
 
           actions.clear()
           actions.add(new IndentAction.AlignOffset(indent max 0))
         case None =>
       }
     }
   }
 
   def line_content(buffer: JEditBuffer, keywords: Keyword.Keywords,
     range: Text.Range, ctxt: Scan.Line_Context): (List[Token], Scan.Line_Context) =
   {
     val text = JEdit_Lib.get_text(buffer, range).getOrElse("")
     val (toks, ctxt1) = Token.explode_line(keywords, text, ctxt)
     val toks1 = toks.filterNot(_.is_space)
     (toks1, ctxt1)
   }
 
   def split_line_content(buffer: JEditBuffer, keywords: Keyword.Keywords, line: Int, caret: Int)
     : (List[Token], List[Token]) =
   {
     val line_range = JEdit_Lib.line_range(buffer, line)
     val ctxt0 = Token_Markup.Line_Context.before(buffer, line).get_context
     val (toks1, ctxt1) = line_content(buffer, keywords, Text.Range(line_range.start, caret), ctxt0)
     val (toks2, _) = line_content(buffer, keywords, Text.Range(caret, line_range.stop), ctxt1)
     (toks1, toks2)
   }
 
 
   /* structure matching */
 
   object Matcher extends StructureMatcher
   {
     private def find_block(
       open: Token => Boolean,
       close: Token => Boolean,
       reset: Token => Boolean,
       restrict: Token => Boolean,
       it: Iterator[Text.Info[Token]]): Option[(Text.Range, Text.Range)] =
     {
       val range1 = it.next.range
       it.takeWhile(info => !info.info.is_command || restrict(info.info)).
         scanLeft((range1, 1))(
           { case ((r, d), Text.Info(range, tok)) =>
               if (open(tok)) (range, d + 1)
               else if (close(tok)) (range, d - 1)
               else if (reset(tok)) (range, 0)
               else (r, d) }
         ).collectFirst({ case (range2, 0) => (range1, range2) })
     }
 
     private def find_pair(text_area: TextArea): Option[(Text.Range, Text.Range)] =
     {
       val buffer = text_area.getBuffer
       val caret_line = text_area.getCaretLine
       val caret = text_area.getCaretPosition
 
       Isabelle.buffer_syntax(text_area.getBuffer) match {
         case Some(syntax) =>
           val keywords = syntax.keywords
 
           val nav = new Navigator(syntax, buffer, false)
 
           def caret_iterator(): Iterator[Text.Info[Token]] =
             nav.iterator(caret_line).dropWhile(info => !info.range.touches(caret))
 
           def reverse_caret_iterator(): Iterator[Text.Info[Token]] =
             nav.reverse_iterator(caret_line).dropWhile(info => !info.range.touches(caret))
 
           nav.iterator(caret_line, 1).find(info => info.range.touches(caret))
           match {
             case Some(Text.Info(range1, tok)) if keywords.is_command(tok, Keyword.theory_goal) =>
               find_block(
                 keywords.is_command(_, Keyword.proof_goal),
                 keywords.is_command(_, Keyword.qed),
                 keywords.is_command(_, Keyword.qed_global),
                 t =>
                   keywords.is_command(t, Keyword.diag) ||
                   keywords.is_command(t, Keyword.proof),
                 caret_iterator())
 
             case Some(Text.Info(range1, tok)) if keywords.is_command(tok, Keyword.proof_goal) =>
               find_block(
                 keywords.is_command(_, Keyword.proof_goal),
                 keywords.is_command(_, Keyword.qed),
                 _ => false,
                 t =>
                   keywords.is_command(t, Keyword.diag) ||
                   keywords.is_command(t, Keyword.proof),
                 caret_iterator())
 
             case Some(Text.Info(range1, tok)) if keywords.is_command(tok, Keyword.qed_global) =>
               reverse_caret_iterator().find(info => keywords.is_command(info.info, Keyword.theory))
               match {
                 case Some(Text.Info(range2, tok))
                 if keywords.is_command(tok, Keyword.theory_goal) => Some((range1, range2))
                 case _ => None
               }
 
             case Some(Text.Info(range1, tok)) if keywords.is_command(tok, Keyword.qed) =>
               find_block(
                 keywords.is_command(_, Keyword.qed),
                 t =>
                   keywords.is_command(t, Keyword.proof_goal) ||
                   keywords.is_command(t, Keyword.theory_goal),
                 _ => false,
                 t =>
                   keywords.is_command(t, Keyword.diag) ||
                   keywords.is_command(t, Keyword.proof) ||
                   keywords.is_command(t, Keyword.theory_goal),
                 reverse_caret_iterator())
 
             case Some(Text.Info(range1, tok)) if tok.is_begin =>
               find_block(_.is_begin, _.is_end, _ => false, _ => true, caret_iterator())
 
             case Some(Text.Info(range1, tok)) if tok.is_end =>
               find_block(_.is_end, _.is_begin, _ => false, _ => true, reverse_caret_iterator())
               match {
                 case Some((_, range2)) =>
                   reverse_caret_iterator().
                     dropWhile(info => info.range != range2).
                     dropWhile(info => info.range == range2).
                     find(info => info.info.is_command || info.info.is_begin)
                   match {
                     case Some(Text.Info(range3, tok)) =>
                       if (keywords.is_command(tok, Keyword.theory_block)) Some((range1, range3))
                       else Some((range1, range2))
                     case None => None
                   }
                 case None => None
               }
 
             case _ => None
           }
         case None => None
       }
     }
 
     def getMatch(text_area: TextArea): StructureMatcher.Match =
       find_pair(text_area) match {
         case Some((_, range)) =>
           val line = text_area.getBuffer.getLineOfOffset(range.start)
           new StructureMatcher.Match(Matcher, line, range.start, line, range.stop)
         case None => null
       }
 
     def selectMatch(text_area: TextArea)
     {
       def get_span(offset: Text.Offset): Option[Text.Range] =
         for {
           syntax <- Isabelle.buffer_syntax(text_area.getBuffer)
           span <- Token_Markup.command_span(syntax, text_area.getBuffer, offset)
         } yield span.range
 
       find_pair(text_area) match {
         case Some((r1, r2)) =>
           (get_span(r1.start), get_span(r2.start)) match {
             case (Some(range1), Some(range2)) =>
               val start = range1.start min range2.start
               val stop = range1.stop max range2.stop
 
               text_area.moveCaretPosition(stop, false)
               if (!text_area.isMultipleSelectionEnabled) text_area.selectNone
               text_area.addToSelection(new Selection.Range(start, stop))
             case _ =>
           }
         case None =>
       }
     }
   }
 }