turned IsarDocument into trait for IsabelleProcess;

--- a/src/Pure/Isar/isar_document.scala	Tue Jan 27 14:45:52 2009 +0100
+++ b/src/Pure/Isar/isar_document.scala	Tue Jan 27 15:22:46 2009 +0100
@@ -7,7 +7,7 @@
 package isabelle
 
 
-object IsarDocument
+trait IsarDocument extends IsabelleProcess
 {
   /* unique identifiers */
 
@@ -18,24 +18,24 @@
 
   /* commands */
 
-  def define_command(proc: IsabelleProcess, id: Command_ID, text: String) {
-    proc.output_sync("Isar.define_command " + IsabelleSyntax.encode_string(id) + " " +
+  def define_command(id: Command_ID, text: String) {
+    output_sync("Isar.define_command " + IsabelleSyntax.encode_string(id) + " " +
       IsabelleSyntax.encode_string(text))
   }
 
 
   /* documents */
 
-  def begin_document(proc: IsabelleProcess, id: Document_ID, path: String) {
-    proc.output_sync("Isar.begin_document " + IsabelleSyntax.encode_string(id) + " " +
+  def begin_document(id: Document_ID, path: String) {
+    output_sync("Isar.begin_document " + IsabelleSyntax.encode_string(id) + " " +
        IsabelleSyntax.encode_string(path))
   }
 
-  def end_document(proc: IsabelleProcess, id: Document_ID) {
-    proc.output_sync("Isar.end_document " + IsabelleSyntax.encode_string(id))
+  def end_document(id: Document_ID) {
+    output_sync("Isar.end_document " + IsabelleSyntax.encode_string(id))
   }
 
-  def edit_document(proc: IsabelleProcess, old_id: Document_ID, new_id: Document_ID,
+  def edit_document(old_id: Document_ID, new_id: Document_ID,
       edits: List[(Command_ID, Option[Command_ID])])
   {
     def append_edit(edit: (Command_ID, Option[Command_ID]), result: StringBuilder)
@@ -56,6 +56,6 @@
     IsabelleSyntax.append_string(new_id, buf)
     buf.append(" ")
     IsabelleSyntax.append_list(append_edit, edits, buf)
-    proc.output_sync(buf.toString)
+    output_sync(buf.toString)
   }
 }